Standard
Title: SPECIFICATION FOR STATION
CLASS METAL OXIDE SURGE
ARRESTERS
Technology
Unique Identifier:
240-75540566
Alternative Reference
Number:
240-56062896
240-56030659
Area of Applicability:
Engineering
Documentation Type:
Standard
Revision:
4
Total Pages:
172
Next Review Date:
May 2019
Disclosure
Classification:
Controlled Disclosure
Compiled by
Approved by
Authorized by
Thavenesen Govender
Kevin Kleinhans
Bheki Ntshangase
Chief Engineer
Chief Engineer
Senior Manager- HV Plant
Engineering
Date:
Date:
Date:
Supported by SCOT/SC
Bheki Ntshangase
HV Plant SC Chairperson
Date:
PCM Reference: <xxxxxx>
SCOT Study Committee Number/Name: <Number or name>
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
2 of 172
Content
Page
1.
Introduction .................................................................................................................................................. 3
2.
Supporting Clauses ..................................................................................................................................... 3
2.1 Scope ................................................................................................................................................. 3
2.1.1 Purpose .................................................................................................................................. 3
2.1.2 Applicability ............................................................................................................................ 3
2.2 Normative/Informative References ..................................................................................................... 3
2.2.1 Normative ............................................................................................................................... 3
2.2.2 Informative ............................................................................................................................. 4
2.3 Definitions ........................................................................................................................................... 4
2.3.1 General .................................................................................................................................. 4
2.3.2 Disclosure Classification ........................................................................................................ 6
2.4 Abbreviations ...................................................................................................................................... 6
2.5 Roles and Responsibilities ................................................................................................................. 6
2.6 Process for Monitoring ....................................................................................................................... 6
2.7 Related/Supporting Documents ......................................................................................................... 6
3.
Specification for Station Class Metal Oxide Surge Arresters ...................................................................... 7
3.1 Requirements ..................................................................................................................................... 7
3.1.1 Operating Conditions ............................................................................................................. 7
3.1.2 General Requirements ........................................................................................................... 7
3.1.3 Mechanical Requirements ..................................................................................................... 8
3.2 Tests .................................................................................................................................................11
3.2.1 General ................................................................................................................................11
3.2.2 Type Tests ...........................................................................................................................12
3.2.3 Routine Tests .......................................................................................................................13
3.3 Documentation .................................................................................................................................13
3.3.1 Supporting Data ...................................................................................................................13
3.3.2 Characteristics Curves .........................................................................................................13
3.3.3 Drawings Submitted with Tender .........................................................................................13
3.3.4 Drawings (Contractual) ........................................................................................................14
3.3.5 Supporting Documentation ..................................................................................................14
3.3.6 Electronic File structure .......................................................................................................14
3.4 Marking and Packaging ....................................................................................................................15
3.4.1 Marking ................................................................................................................................15
3.4.2 Packaging ............................................................................................................................15
4.
Authorization ..............................................................................................................................................16
5.
Revisions ...................................................................................................................................................17
6.
Development Team ...................................................................................................................................17
7.
Acknowledgements ...................................................................................................................................17
Annex A – Technical Schedules and Items Offered .........................................................................................18
Annex B - - Type test report summary sheet (To be completed per item) ....................................................167
Annex C - Summary sheet of drawings, outlines and characteristic curves (To be completed per item) .....169
Annex D - Deviations and Declaration (To be completed per item) ...............................................................172
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrold and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
1.
3 of 172
Introduction
Surge arresters are installed in substations and on transmission lines to limit transient overvoltages that may
lead to flashovers and failure of substation HV terminal equipment. To ensure that surge arresters perform
satisfactorily in service, they must be designed, constructed and tested according to specified technical
requirements. This specification sets out Eskom's requirements for the design, manufacture, testing and
delivery of non-linear metal oxide station class surge arresters for use on the Eskom network.
2.
Supporting Clauses
2.1
Scope
This specification sets out Eskom’s requirements for the manufacture, testing, supply and delivery of station
class, non-linear metal-oxide surge arresters for installation on 6,6kV, 11kV, 22kV, 33kV, 44kV, 66kV, 88kV,
132kV, 220kV, 275kV, 400kV and 765kV distribution, sub-transmission and transmission networks.
2.1.1
Purpose
The purpose of this specification is to ensure that station class metal oxide surge arresters for use in
Eskom’s distribution, sub-transmission and transmission network are designed, manufactured, tested,
supplied and delivered in accordance with Eskom's requirements to satisfy the desired technical
performance.
2.1.2
Applicability
This document shall apply throughout Eskom Holdings Limited Divisions.
2.2
Normative/Informative References
Parties using this document shall apply the most recent edition and applicable amendments of the
documents listed in the following paragraphs.
2.2.1
Normative
[1]
ISO 9001 Quality Management Systems.
[2]
SANS 60099-4: 2009 Surge Arresters - Part 4: Metal-oxide surge arresters without gaps for a.c.
systems
[3]
IEC 60815: Guide for the selection of insulators in respect of polluted conditions
[4]
SANS 121: 2000/ISO 1461:1999: Hot dip galvanized coatings on fabricated iron and steel articles Specifications and test methods.
[5]
34-215, KIPTS natural ageing and pollution performance test procedure for outdoor insulator
products. Section 3 - Particular requirements for surge arresters.
[6]
NRS 039, Guide for the application of gapless metal-oxide surge arresters in distribution systems.
[7]
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
[8]
Eskom Procedure, TPC41-246, Management of Manufacturers/Supplier Equipment Drawings,
Revision 3.
[9]
Eskom Policy, TPL 32-727, Safety, Health, Environment and Quality (SHEQ) requirements.
[10]
Republic of South Africa, Occupational Health and Safety Act (No. 85 of 1993).
[11]
Eskom Procedure, E 32-846, Operating regulations for high voltage systems.
[12]
IEC 60071-1:2006, Insulation co-ordination – Part 1: Definitions, principles and rules
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
4 of 172
2.2.2
Informative
[13]
IEEE Std C62.11-1999: IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits (> 1
kV)
2.3
Definitions
2.3.1
General
Definition
Description
Coastal
In this document, refers to any surge arrester installation within 50 km of the
coastline.
Continuous current of
an arrester:
The current flowing through the arrester when energized at the continuous
operating voltage. [IEC 60099-4]
Discharge current of
an arrester
The impulse current which flows through the arrester. [IEC 60099-4]
Disconnecting device
A device for disconnecting an arrester from the system in the event of arrester
failure, to prevent a persistent fault on the system and to give visible indication
of the failed arrester [IEC 60099-4]
Distribution Class
Arrester
Arresters having nominal discharge current ≤ 5 000 A
Highest voltage for
equipment (Um):
The highest r.m.s. phase-to-phase, power frequency voltage for which the
equipment is designed in respect of its insulation as well as other
characteristics which relate to this voltage in the relevant equipment standards.
[NRS 039].
Inland
In this document, refers to any surge arrester installation greater than 50 km
from the coastline.
Maximum continuous
operating voltage
(MCOV or Uc)
The highest r.m.s. power-frequency voltage that an arrester can withstand
continuously. [NRS 039].
Metal-oxide surge
arrester without
spark-gaps
An arrester having non-linear metal-oxide resistors connected in series and/or
in parallel without any integrated series or parallel spark-gaps. [IEC 60099-4].
Nominal discharge
current of an arrester
(In)
The peak value of lightning impulse current which is used to classify an
arrester. [IEC 60099-4]
Polymer-housed
arrester
Arrester using polymeric and composite material for housing, with fittings [IEC
60099-4]
Porcelain-housed
arrester
Arrester using porcelain as housing material, with fittings and sealing systems
[IEC 60099-4]
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
5 of 172
Definition
Description
Rated voltage of an
arrester (Ur)
The maximum permissible r.m.s. value of power frequency voltage between its
terminals at which it is designed to operate correctly under temporary
overvoltage conditions as established in the operating duty tests.
NOTE — The rated voltage as defined in this document is the 10 s power frequency voltage
used in the operating duty test after high current, or long duration impulses. Tests used to
establish the voltage rating in IEC 60099-1, as well as some National Standards, involve the
application of repetitive impulses at nominal current with power frequency voltage applied.
Attention is drawn to the fact that these two methods used to establish rating do not
necessarily produce equivalent values. (A resolution for this discrepancy is under
consideration). [IEC 60099-4] [NRS 039]
Reference current of
an arrester (Iref)
The peak value (the higher peak value of two polarities if the current is
asymmetrical) of the resistive component of power-frequency current that is
used to determine the reference voltage of the arrester. [NRS 039]
NOTE — Depending on the nominal discharge current or the line discharge class (or both) of
the arrester, the reference current will be typically in the range 0,05 mA to 1,0 mA per square
centimetre of disc area for single column arresters
Reference voltage of
an arrester (Uref)
The peak value of power frequency voltage divided by 2 that is applied to an
arrester to obtain the reference current. [NRS 039]
NOTE 1 The reference voltage of a multi-unit arrester is the sum of the reference voltages of
the individual units.
NOTE 2 Measurement of the reference voltage is necessary for the selection of a correct
test sample in the operating duty test.
Residual voltage
(discharge voltage)
The voltage that is maintained (between the arrester terminals) during the
passage of defined current through an arrester (Ures of discharge current and
that determines the protective characteristics of the arrester) [NRS 039]
Specified long-term
load (SLL)
Force perpendicular to the longitudinal axis of an arrester, allowed to be
continuously applied during service without causing any mechanical damage
to the arrester. [IEC 60099-4]
Specified short-term
load (SSL)
Greatest force perpendicular to the longitudinal axis of an arrester, allowed to
be applied during service for short periods and for relatively rare events (for
example short-circuit current loads and extreme wind gusts) without causing
any mechanical damage to the arrester. [IEC 60099-4]
Station Class
Arresters
Arresters having nominal discharge current ≥ 10 000 A
System earthing effective
An earthed system, or portion of the system, in which the power frequency
phase-to-earth overvoltages associated with earth faults are limited to 0,8Um.
System earthing non-effective
A system in which the neutral is intentionally connected to the system earth
through a current limiting device.
Type tests
Tests which are made upon completion of the development of a new arrester
design to establish representative performance and to demonstrate
compliance with the relevant standard [IEC 60099-4]
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
2.3.2
6 of 172
Disclosure Classification
Controlled disclosure: Controlled disclosure to external parties (either enforced by law, or discretionary).
2.4
Abbreviations
Abbreviation
Description
A
Ampere
IEC
International Electrotechnical Commission
IEEE
Institute of Electrical and Electronic Engineers
ISO
Internal Standardization Organisation
kA
Kiloampere
kV
Kilovolt
SCD
Specific Creepage Distance
µs
Microsecond
SANS
South African National Standard
2.5
Roles and Responsibilities
The surge arrester care group leader must ensure that this document is updated, renewed and current at all
times.
2.6
Process for Monitoring
None
2.7
Related/Supporting Documents
The following documents have been superseded by this document and shall be archived for reference
purposes only:

240-56062896: Specification for Outdoor Metal Oxide Surge Arresters Without Spark Gaps for
System Voltages of 220kV and Above Standard (Alternative Reference Number: TSP 41-363)

240-56030659: Station Class, Metal-Oxide Surge Arresters Without Spark-Gaps Standard
(Alternative Reference Number: 34-419)
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
7 of 172
3.
Specification for Station Class Metal Oxide Surge Arresters
3.1
Requirements
3.1.1
Operating Conditions
3.1.2
A.
Altitude
1800 m
B.
Average humidity
30% to 90%;
C.
Ambient temperature
Minimum: - 10 °C
Maximum: + 40 °C
D.
Daily temperature variation
Maximum: 30 °C
E.
Solar radiation
1.1 kW/m
F.
IEC 60815 Pollution Class
Inland applications: Class d; Minimum SCD25 mm/kV
Coastal applications: Class e, Minimum SCD31 mm/kV
Note: Items 31, 32 and 33 require a minimum
SCD of 38 mm/kV
G.
Lightning activity
High
H.
Earthing
6.6 to 33 kV networks: Non-effectively earthed;
44 to 765 kV networks: Effectively earthed
I.
System configuration
Three-phase, three wire
J.
Nominal system voltage (Un)
6.6, 11, 22, 33, 44, 66, 88, 132, 220, 275, 400,
765 kV;
K.
System frequency
50 Hz
L.
Seismic
0.3 G
2
General Requirements
For each Nominal System Voltage level, the major performance requirements are set out in the respective
Schedule A. In addition to these requirements, the following should be met:
a)
If specified in Technical Schedule A, the arrester shall be immune to the effects of live spray
washing. A test report proving this shall be submitted for Eskom’s approval.
b)
Arresters will be immune to the effects of airborne contamination on the external surfaces of the
arrester housing as specified and evaluated by clause 3.1.1.F.
c)
For Nominal System Voltages of 132 kV and below, only single column (series stack) arresters are
acceptable because unequal current sharing between parallel stacks is a common problem in
multi-column arresters.
d)
Internal components shall be dry at the time of assembly and arresters shall be permanently
sealed. If elastomer gaskets or seals are used, precautions shall be taken to ensure adequate
compression and that such gaskets or seals do not deteriorate in service as a result of exposure to
the environment or electrical stresses.
e)
All ferrous, non-current carrying components exposed to the atmosphere shall be hot-dip
galvanized in accordance with SANS 121.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
f)
Unique Identifier: 240-75540566
Revision:
8 of 172
Page:
Arresters shall withstand short-circuit currents without violent shattering, and shall have the ability
to self-extinguish any fire caused by the arc. The short circuit performance of the arrester will be as
per SANS 60099-4.
g)
All surge arresters are to be housed in polymeric insulation and profiles are to be designed in
accordance with the requirements in IEC 60815 with no deviations. Open, flat profiles are
preferred. Where the insulators are not of the flat profile (for e.g. having under-ribs), the insulator
will be deemed to be one IEC pollution class lower than the equivalent flat profile.
h)
Only conventional silicone rubber polymer will be accepted for the housing material. Nonconventional or exotic blends of material are not acceptable.
i)
Ceramic housings are not acceptable.
j)
Any design changes shall be verified by testing and shall be subject to Eskom’s written approval.
k)
One sample per design, equipped as for service, shall be available for inspection at the premises of
the supplier. Samples shall be available within one week from notification during an enquiry.
l)
Unique product code shall be assigned per arrester rating. The product codes shall also distinguish
between arresters intended for inland or coastal applications, as well as load bearing applications.
m)
Pro-rata arrester sections will provide a thermal replica of the complete arrester.
n)
The guarantees of all major performance criteria stated in Schedule B will be supported by
evidence in the form of type test certificates.
o)
Grading rings and associated fittings must be securely attached without the possibility of coming
loose during normal operation. Welded rings are preferred. Method of attachment must be
submitted with tender returnables for approval by Eskom.
p)
Arresters shall be designed for an expected lifespan of 30 years.
q)
All information to be supplied in English.
3.1.3
Mechanical Requirements
3.1.3.1 Sealing
Sealing, except where the external housing is directly moulded on the internal components:

Surge arresters will be permanently sealed. Dryness of internal components will be ensured by
hermetic seals and moisture absorption devices e.g. silica gel.

An approved routine test of seal integrity must be carried out on every assembled arrester or
arrester unit.

Technical details of the sealing arrangements and the routine seal test must be submitted for
approval.

The sealing requirement is not applicable where the external housing is directly moulded in the
internal component of the surge arrester.
3.1.3.2 Mounting
3.1.3.2.1 Nominal System Voltages Greater than 220 kV
a)
All arresters will be isolated from the support structure by either an insulated base or support
insulators. Support insulators may be constructed of epoxy or porcelain. Once installed, the
arrester should be able to stand upright without additional support and must not be able to slide off
the support/insulated base insulators. Method and details of components supplied for mounting
must be submitted with tender returnables for approval by Eskom.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
9 of 172
3.1.3.2.2 Nominal System Voltages from 6.6 kV to 44 kV
a)
The 6.6 kV to 44 kV arresters shall be arranged for base mounting.
b)
Eskom’s mounting bracket is 70 mm wide and has a single 14 mm diameter mounting hole.
c)
A threaded stud (M12 x 50 mm), a nut, spring washer and two flat washers shall be supplied per
arrester.
3.1.3.2.3 Nominal System Voltages from 66 kV to 132 kV
a)
The 66 kV to 132 kV arresters shall be arranged for base mounting and shall be compatible with
the drilling plan specified in Figure 1.
b)
A tripod base shall be provided.
c)
Eskom’s mounting bracket is 15 mm thick, with 14 mm diameter mounting holes.
d)
Three mounting bolts shall be supplied per arrester. Each mounting bolt shall be supplied
complete with a nut, tapered washer (See Figure 2) and two flat washers.
Figure 1: Drilling plan for surge arrester base mounting (66 kV, 88kV and 132 kV arresters)
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
10 of 172
Figure 2: Tapered washer
3.1.3.3 Line and Earth End Terminals
3.1.3.3.1 Nominal System Voltages from 6.6 kV to 44 kV
On arresters equipped for service there shall be no visible permanent deformation of the terminals of the
arrester when a force of 100 N is applied for 1 minute to the tip of the terminal.
If dissimilar metals are used for the arrester terminals and conductor clamping arrangements, proof shall be
provided of the galvanic compatibility of these materials.
The line terminal of the 6,6 kV to 44 kV arresters shall consist of a threaded stud (M12 x 50 mm), a nut, two
flat washers and spring washer (for application of a crimped lug, M12 hole).
No additional earth terminal is required on the 6,6 kV to 44 kV arresters.
3.1.3.3.2 Nominal System Voltages from 66 kV to 132 kV
On arresters equipped for service, there shall be no visible permanent deformation of the terminals of the
arrester when a force of 100 N is applied for 1 min to the tip of the terminal.
If dissimilar metals are used for the arrester terminals and conductor clamping arrangements, proof shall be
provided of the galvanic compatibility of these materials.
The line terminal of the 66 kV to 132 kV arresters shall consist of a 26 mm x 100 mm aluminium stem (for
application of a K-clamp). Terminals must be constructed out of a solid piece of material. Screw-on
extensions used for increasing the diameter of terminal up to the required diameter are not acceptable.
An earth terminal in accordance with Example 1 or Example 2 of Example 1
Example 2
Figure 3 shall be provided for the 66 kV to 132 kV arresters. The earth termination shall accommodate a 3
mm x 50 mm copper strap.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
Example 1
11 of 172
Example 2
Figure 3: Earth terminal, Examples 1 and 2
3.1.3.3.3 Nominal System Voltages of and Greater than 220 kV
Both line and earth-lead terminations will be suitable for the standard conductor of dimensions and materials
specified in Schedule A.
Terminals will be of sufficient strength to withstand forces arising during installation and service. Such forces
will not overstress the components of the arrester, particularly the sealing system. If dissimilar metals are
used for the arrester terminals and conductor clamping arrangements, proof shall be provided of the galvanic
compatibility of these materials.
All line terminals shall be 38 mm in diameter. Terminals must be constructed out of a solid piece of material.
Screw-on extensions used for increasing the diameter of terminal up to the required diameter are not
acceptable.
3.1.3.4 Finish
All ferrous components exposed to the atmosphere, excluding those of stainless steel and aluminium, will be
hot-dip galvanized in accordance with SANS 121. This includes earth terminals and holding-down bolts.
3.2
Tests
3.2.1
General
a)
All type and routine tests on arresters, or where applicable pro-rata sections, identical to those
stipulated in Technical Schedule A and offered in Technical Schedule B of an enquiry document,
shall be conducted in accordance with SANS 60099-4: 2009.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
b)
c)
Unique Identifier: 240-75540566
Revision:
12 of 172
Page:
Single copies of type test reports (in English) shall be submitted with a tender. If all the required
type test reports are not submitted, the tender will be rated incomplete and may be excluded. If
required, any special test reports will be submitted as soon as possible and at least three months
before dispatch of the arresters.
Type tests reports from in-house testing laboratories may be accepted subject to the following
conditions:

Proof of the long-term, in-service performance of the product range must be provided or

The product range must have an acceptable in-service history on the Eskom network.

Proof of test and measurement equipment calibration date, frequency of calibration,
method of calibration and IEC or equivalent standard followed for calibration must be
submitted for approval by Eskom.

Witnessed by an independent, accrediting body qualified to assess the validity of such
tests.
d)
Eskom reserves the right to demand test reports from an accredited testing laboratory should any
problems arise that question the validity of the in-house test reports. An accredited testing
laboratory is defined as that which is ISO/IEC 17025 accredited and/or which holds valid
certification issued by ILAC (International Laboratory Accreditation Corporation) or one of its
members.
e)
Eskom reserves the right to appoint a representative to inspect the arresters at any stage of
manufacture and to witness and sanction any tests. If inspection or witnessing of tests is required,
Eskom will advise the contractor who will then give six weeks notice of the date on which
impending inspection or testing will take place.
f)
Any design change must be verified by tests wherever applicable and will be subject to Eskom's
approval.
3.2.2
Type Tests
a)
Test certificates and reports shall be provided to prove that the surge arresters comply fully with the
provisions of SANS 60099-4:2009 for polymer-housed arresters as well as for any further
requirements as stipulated in this specification as well as the relevant Technical Schedule A.
b)
Should such evidence not be available, the relevant type tests will be performed and the costs
thereof paid by the manufacturer or supplier.
c)
Type test reports shall be arranged and numbered in the order set out in Annex B and shall be
marked clearly with the identification and description of the relevant test number in Annex B.
d)
Should the product naming convention used in the type test report differ from that of the product
offered, clear unambiguous explanation must be given indicating how the product tested is
applicable to that offered.
e)
The following type tests shall be conducted as per SANS 60099-4:2009 and submitted for review:

Insulation withstand test on the arrester housing

Residual voltage test

Long duration current impulse withstand test

Operating duty tests

Internal partial discharge tests

Radio interference voltage (RIV) test

Verification of the power frequency voltage versus time characteristic

Short-circuit tests
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
13 of 172

Weather ageing test: 1000h

Bending test

Seal leakage test

Note: If a type test is not submitted or not applicable to the design offered, clear
justification must be provided in the comments column of Annex B
f)
For arresters 132 kV and below, testing shall be done in accordance with the KIPTS natural ageing
and pollution performance test procedure for outdoor insulator products, Section 3 – Particular
requirements for surge arresters, 34-215. For SCD of 25 mm/kV and 31 mm/kV, the KIPTS LightMedium (LM) and Heavy-Very Heavy (HVH) cycle certificates are required respectively.
3.2.3
Routine Tests
a)
Routine tests will be performed on the arresters in full accordance with SANS 60099-4:2009 for
polymer-housed arresters.
3.3
Documentation
3.3.1
Supporting Data
Supporting data in the form of marketing brochures or catalogues stating the electrical characteristics of the
arresters on offer shall be included with the tender. Deviations between the published data and the
completed Technical Schedule B shall be pointed out and clarified.
3.3.2
Characteristics Curves
The manufacturer of the metal oxide surge arresters will furnish Eskom with the following characteristic data
per item:
a)
V-I characteristics (protective level characteristics) at 8/20 µs, 30/60 µs and 1/2 µs (steep current)
impulses
b)
Temporary overvoltage withstand capability curve with and without prior duty.
c)
AC voltage-resistive current curves from 20°C to 180°C
d)
Region of thermal stability
Note: These curves shall be submitted as drawings that contain the manufacturers name, logo and a unique drawing number as
a minimum. Clear unambiguous definitions of rated voltage, reference voltage and protective level must be provided. Curves
submitted as part of a test report and/or data sheet are not acceptable. Items a and b are mandatory requirements, items c and
d may be required before contract award or to be made available during factory inspection.
3.3.3
Drawings Submitted with Tender
Single copies of drawings will be submitted as part of the original tender showing the following details:
a)
Overall dimensions, including mounting details with drilling plan.
b)
Line conductor and earth conductor clamping arrangements.
c)
Line and earth terminal type details and physical dimensions.
d)
Minimum electrical clearances.
e)
Details of special items such as the disconnecting device or overpressure relief device.
f)
Insulating base type details and physical dimensions (where applicable).
g)
Total creepage and SCD.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
3.3.4
14 of 172
Drawings (Contractual)
Outline drawings, of which three hard copies, electronic copies in scale PDF and acceptable CAD format, will
be submitted for approval in accordance with [8], and must contain the following information as a minimum:
a)
Overall dimensions, including mounting details
b)
Details of main and earthing terminals and conductor clamping arrangements
c)
Mass of complete arrester, and if applicable, individual arrester sections
d)
Minimum electrical clearances
e)
Creepage distances
f)
A drawing indicating the position of the identification rating plate and the detail that will be provided
on the rating plate.
Drawings will be submitted not later than one month from contract award date for approval. Once the
drawings have been approved by Eskom, the contractor will be notified and supplied with an Eskom drawing
number and additional details (if required). The Eskom drawing number as well as additional details (if
required) must then be incorporated in the approved drawing and sent back to Eskom for acceptance and
archiving.
3.3.5
Supporting Documentation
Single copies of the following documentation will be submitted as part of the original tender:
a)
Product catalogue.
b)
Transport, storage and installation procedure.
c)
Compliance to ISO 9001 and IEC/ ISO 17025 certificates.
d)
Customer reference list for each item type tendered for.
e)
Factory location, facility name, production start date and routine test failure rate for each item
tendered for.
3.3.6
Electronic File structure
For electronic/softcopy files submitted as part of the technical component of the tender submission, the
folder structure given in Figure 4 is preferred. The folder structure should be arranged per item offered and
should contained all relevant information relating to that item.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
15 of 172
Figure 4: Folder structure for electronic files
3.4
Marking and Packaging
3.4.1
Marking
The minimum required information as per IEC 60099-4 shall appear on a rating plate permanently attached
to the arrester. In addition the following shall appear:
a)
Physical location and name of facility of manufacture.
b)
Line discharge class or high lightning duty type (see Annex C of IEC 60099-4).
c)
Contamination withstand level of the enclosure as per IEC 60815 or SCD value.
d)
Rated altitude
3.4.2
Packaging
a)
For arresters to be used on systems ≤ 132 kV, the packaging shall be such as to protect the
arrester and its components against corrosion and damage during normal handling, unpackaging,
transportation and storage.
b)
For arresters to be used on systems ≥ 220 kV, the arrester shall be packaged in crates and shall
be such as to protect the arrester and its components against corrosion and damage during normal
handling, uncrating, transportation and outdoor storage for a period up to two years. The crate
must be able to be lifted using forklifts and/or slings. Lifting positions must be marked. Crates must
be designed such that inspections of the contents can be undertaken without opening or damaging
the crate.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
c)
16 of 172
Page:
Marking of packaging shall be such as to permit easy identification of the components without their
removal from the packing.
d)
Each container shall bear the following information on the outside of the container:
e)

Product description;

Product code or part number;

Name of manufacturer and contact details;

Number of components of each type in the container;

Address of the destination;

Eskom’s purchase order number;

Eskom’s material SAP number(s).
If the product is supplied by a third party supplier (e.g. importers, agents, etc.) the container shall
also bear the following information on the outside of the container:

Name of the supplier;

Contact details of the supplier.
f)
Where arresters are supplied with grading rings, the arrester, it’s corresponding grading ring and
associated fittings must be housed in a single package or alternatively in uniquely numbered
packages identifying each arrester, its corresponding grading ring and associated fittings. It is not
acceptable to have multiple arresters, grading rings and or fittings in one package. The method of
packaging and numbering must be submitted for approval.
g)
Assembly diagrams and installation/instruction manual must be supplied with each arrester and
associated fittings in weather proof housing to ensure correct usage and installation at site.
4.
Authorization
This document has been seen and accepted by:
Name and surname
Designation
Kevin Kleinhans
Chief Engineer
Lerato Morife
Middle Manager
Willem Dirkse van Schalkwyk
Chief Engineer
Chris Van Der Merwe
Corporate Consultant
Hendri Geldenhuys
Corporate Consultant
Percy Seboco
Senior Technologist
Fernando Witbooi
Chief Technologist
Mohamed Khan
Senior Engineer
Harald Diez
Senior Technologist
Rieghard Vermaak
Engineer
Thavi Govender
Chief Engineer
Roy Hubbard
Senior Consultant
Gavin Strelec
Chief Engineer
Areno Singh
Chief Engineer
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
17 of 172
Page:
Name and surname
Designation
Mbali Mapaila
Senior Advisor
Yurisha Reddy
Senior Advisor
5.
Revisions
Date
Rev.
Compiler
Remarks
April 2015
4
T Govender
Revision and updates to general requirements, type test
requirements, materials, schedules and annexes.
June 2014
3
T Govender
Changes undertaken to comply with new procurement
policy. Non-KIPTS items included. RIV and pollution test
requirements detailed further.
May 2014
2
T Govender
Torsional load values for mechanical load bearing units
increased. Extreme pollution environment items included.
March 2014
1
T Govender
A single standard for station class surge arresters at all
voltage levels was required. This document combines and
supersedes the following:
6.

240-56062896: Specification for Outdoor Metal
Oxide Surge Arresters Without Spark Gaps for
System Voltages of 220kV and Above Standard
(Alternative Reference Number: TSP 41-363)

240-56030659: Station Class, Metal-Oxide Surge
Arresters
Without
Spark-Gaps
Standard
(Alternative Reference Number: 34-419)
Development Team
The following people were involved in the development of this document:

T Govender

K Kleinhans

F Witbooi
7.
Acknowledgements
The Surge Arrester Care Group members are acknowledged for their input in compiling this document.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
18 of 172
Annex A – Technical Schedules and Items Offered
Item
Title
Application
1A
Station class surge arresters for 6.6 kV system
25 mm/kV (KIPTS)
1B
Station class surge arresters for 6.6 kV system
25 mm/kV (Non-KIPTS)
2A
Station class surge arresters for 6.6 kV system
31 mm/kV (KIPTS)
2B
Station class surge arresters for 6.6 kV system
31 mm/kV (Non-KIPTS)
3A
Station class surge arresters for 11 kV system
25 mm/kV (KIPTS)
3B
Station class surge arresters for 11 kV system
25 mm/kV (Non-KIPTS)
4A
Station class surge arresters for 11 kV system
31 mm/kV (KIPTS)
4B
Station class surge arresters for 11 kV system
31 mm/kV (Non-KIPTS)
5A
Station class surge arresters for 22 kV system
25 mm/kV (KIPTS)
5B
Station class surge arresters for 22 kV system
25 mm/kV (Non-KIPTS)
6A
Station class surge arresters for 22 kV system
31 mm/kV (KIPTS)
6B
Station class surge arresters for 22 kV system
31 mm/kV (Non-KIPTS)
7A
Station class surge arresters for 33 kV & 44 kV system
25 mm/kV (KIPTS)
7B
Station class surge arresters for 33 kV & 44 kV system
25 mm/kV (Non-KIPTS)
8A
Station class surge arresters for 33 kV & 44 kV system
31 mm/kV (KIPTS)
8B
Station class surge arresters for 33 kV & 44 kV system
31 mm/kV (Non-KIPTS)
9A
Station class surge arresters for 66 kV system
25 mm/kV (KIPTS)
9B
Station class surge arresters for 66 kV system
25 mm/kV (Non-KIPTS)
10A
Station class surge arresters for 66 kV system
31 mm/kV (KIPTS)
10B
Station class surge arresters for 66 kV system
31 mm/kV (Non-KIPTS)
11A
Station class surge arresters for 88 kV system
25 mm/kV (KIPTS)
11B
Station class surge arresters for 88 kV system
25 mm/kV (Non-KIPTS)
12A
Station class surge arresters for 88 kV system
31 mm/kV (KIPTS)
12B
Station class surge arresters for 88 kV system
31 mm/kV (Non-KIPTS)
13A
Station class surge arresters for 132 kV system
25 mm/kV (KIPTS)
13B
Station class surge arresters for 132 kV system
25 mm/kV (Non-KIPTS)
14A
Station class surge arresters for 132 kV system
31 mm/kV (KIPTS)
14B
Station class surge arresters for 132 kV system
31 mm/kV (Non-KIPTS)
15
Station class surge arresters for 220 kV system
25 mm/kV
16
Station class surge arresters for 220 kV system
31 mm/kV
17
Station class surge arresters for 220 kV system
25 mm/kV and mechanical
load bearing
18
Station class surge arresters for 220 kV system
31 mm/kV and mechanical
load bearing
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Offered
(Y/N)
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
19 of 172
19
Station class surge arresters for 275 kV system
25 mm/kV
20
Station class surge arresters for 275 kV system
31 mm/kV
21
Station class surge arresters for 275 kV system
25 mm/kV and mechanical
load bearing
22
Station class surge arresters for 275 kV system
31 mm/kV and mechanical
load bearing
23
Station class surge arresters for 400 kV system
25 mm/kV
24
Station class surge arresters for 400 kV system
31 mm/kV
25
Station class surge arresters for 400 kV system
25 mm/kV and mechanical
load bearing
26
Station class surge arresters for 400 kV system
31 mm/kV and mechanical
load bearing
27
Station class surge arresters for 765 kV system
25 mm/kV
28
Station class surge arresters for 765 kV system
31 mm/kV
29
Station class surge arresters for 765 kV system
25 mm/kV and mechanical
load bearing
30
Station class surge arresters for 765 kV system
31 mm/kV and mechanical
load bearing
31
Station class surge arresters for 132 kV system
Extreme Pollution
Environment
32
Station class surge arresters for 400 kV system
Extreme Pollution
Environment
33
Station class surge arresters for 400 kV system
Extreme Pollution
Environment and
mechanical load bearing
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
20 of 172
Page:
TECHNICAL SCHEDULE FOR ITEMS 1A AND 1B: STATION CLASS SURGE
ARRESTERS FOR 6.6 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule
A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxxxxx
1.3
Product code
xxxxxxxxx
2
Operating conditions:
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class
d
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
6.6
2.12
Maximum system voltage
kV
7.3
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
75
3
Electrical characteristics of arrester
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxxxxx
3.7
MCOV (Uc)
kV
7.3
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
21 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing
xxxxxxxxx
4.1
Housing material
Silicone
Polymer
4.3
Minimum external creepage distance
xxxxxxxxx
4.3.1
Item 1A & 1B [Um x 25 mm/kV]
4..4
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
4.4.1
c
xxxxxxxxx
4.4.2
s/p
xxxxxxxxx
4.4.3
Ld/d
xxxxxxxxx
4.4.4
P1 - P2
xxxxxxxxx
4.4.5
CF
xxxxxxxxx
4.4.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing mounting details
xxxxxx
6
Arrester line terminal
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and spring washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring washer
Yes
7.6
Material
xxxxxxx
7.7
Reference number of drawing showing details of line
terminal
xxxxxxx
8
Drawings to be submitted with tender
xxxxxxxxx
xxxxxxxxx
Single copies of drawings shall be submitted as part of the
original tender showing the following detail:
xxxxxxxxx
xxxxxxxxx
kV
mm
mm
mm
27
xxxxxxxxx
xxxxxxxxx
183
xxxxxxxxx
xxxxxxxxx
50
xxxxxxxxx
50
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
22 of 172
Page:
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping arrangement
Reference
Number:
8.4
Details of grading rings
Reference
Number:
8.5
Arrester characteristic data required
xxxxxxxxx
8.5.1
V-I characteristic curve, AC
Reference
Number:
8.5.2
V-I characteristic curve, DC
Reference
Number:
8.5.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
Reference
Number:
8.5.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
xxxxxxxxx
8.5.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
8.5.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
8.5.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
9
Physical dimensions of arresters
9.1
Overall height of arrester
mm
xxxxxx
9.2
Minimum external flashover distance
mm
200
9.3
External diameter of arrester housing
mm
xxxxxx
9.4
Diameter of voltage grading rings
mm
xxxxxx
9.5
Distance of grading ring from top of arrester
mm
xxxxxx
10
MOV elements
10.1
Diameter elements
mm
xxxxxxx
10.2
Thickness elements
mm
xxxxxxx
10.3
Number of elements per arrester
xxxxxxx
10.4
Number of stacks in parallel
0
11
Miscellaneous
xxxxxxxxx
11.1
Live spray washing (Yes/No)
No
11.2
Total mass of assembled unit
xxxxxxxxx
xxxxxxxxx
o
11.3
Minimum expected life of arrester at 40 C and MCOV
11.4
Sample available for inspection
11.5
Declared specified long-term load
11.6
Insulation withstand test (Reference number of test report)
11.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
Kg
xxxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
kN
xxxxxxx
xxxxxxx
kV
48
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
23 of 172
Page:
r.m.s
kV
11.8
60 s wet power frequency withstand
22
11.9
Residual voltage test (Reference number of test report)
11.10
Maximum residual voltage for a 10kA steep current impulse
(1/20μs)
11.11
Maximum residual voltage for a lightning current impulse
(8/20μs) of magnitude:
11.11.1
5 kA
kV
xxxxxxx
11.11.2
10 kA
kV
27
11.11.3
20 kA
kV
xxxxxxx
11.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxxx
11.13
Long duration current impulse withstand test
xxxxxxxxx
11.13.1
Reference number of test report
xxxxxx
11.13.2
Charging voltage
xxxxxxxxxx
kV
30
xxxxxxxxx
pu of
Ur
or
xxxxxxxxx
3.2
xxxxxxxxx
11.13.3
Charging current
A
xxxxxx
11.13.4
Virtual duration of peak
μs
2000
11.13.5
Number of discharge operations
18
11.13.6
Number of grouped operations
6
11.13.7
Operations per group
3
11.13.8
Maximum interval between operations
11.13.9
Interval between operations
11.13.10
Maximum permitted change in residual voltage after long
duration current impulse withstand test
11.14
Operating duty test
xxxxxxxxx
11.14.1
Reference number of test report
xxxxxx
Conditioning part 1:
xxxxxxxxx
s
xxxxxxxxx
xxxxxxxxx
60
Cool to
ambient
%
5
11.14.2
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
11.14.3
Number of discharge operations
20
11.14.4
Number of grouped operations
4
11.14.5
Operations per group
5
11.14.6
Interval between operations
s
60
11.14.7
Intervals between groups
min
30
kV
Conditioning part 2:
xxxxxxxxx
8.7
xxxxxxxxx
11.14.8
High current impulse (4/10μs)
11.14.9
Number of applications
2
11.15
Conditions for switching surge test
xxxxxxxxx
kA
xxxxxxxxx
xxxxxxxxx
100
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
24 of 172
Page:
11.15.1
pu of
Ur
Charging voltage
or
3.2
xxxxxxxxx
11.15.2
Charging current
A
xxxxxxxxx
11.15.3
Virtual duration of peak
μs
2000
11.15.4
Number of discharge operations
11.15.5
Interval between operations
s
60
11.15.6
Starting temperature for first impulse
o
60
11.15.7
Energy dissipated during second impulse
kJ
xxxxxx
12
Conditions for power frequency test at elevated levels
as in IEC 60099-4, 7.5.2:
12.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.3
Elevated continuous operating voltage (Uc*) applied for 30
min
kV
xxxxxxx
12.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.5
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.6
Short-circuit test (Reference number of test report)
xxxxxx
12.6.1
High current
kA
r.m.s
40
12.6.2
Low current
kA
r.m.s
0.6 ± 0.2
12.7
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.8
Internal partial discharge test (Reference number of test
report)
12.8.1
Power frequency voltage applied [1.05 x MCOV]
kV
7.7
12.8.2
Maximum partial discharge
pC
10
12.9
Moisture ingress test (Reference number of test report)
xxxxxx
12.10
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
xxxxxxxxx
1A
Yes
1B
No
xxxxxxxxx
xxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
25 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 2A AND 2B: STATION CLASS SURGE
ARRESTERS FOR 6.6 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule
A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxxx
1.3
Product code
xxxxxxx
2
Operating conditions:
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class: Item 2
e
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
6.6
2.12
Maximum system voltage
kV
7.3
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
75
3
Electrical characteristics of arrester
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxxxxx
3.7
MCOV (Uc)
kV
7.3
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
26 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing
4.1
Housing material: Item 2
4.3
Minimum external creepage distance
4.3.1
Item 2A and 2B [Um x 31 mm/kV]
4..4
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
4.4.1
c
xxxxxxxxx
4.4.2
s/p
xxxxxxxxx
4.4.3
Ld/d
xxxxxxxxx
4.4.4
P1 - P2
xxxxxxxxx
4.4.5
CF
xxxxxxxxx
4.4.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing mounting details
xxxxxx
6
Arrester line terminal
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and spring washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring washer
Yes
7.6
Material
xxxxxx
7.7
Reference number of drawing showing details of line
terminal
xxxxxxx
8
Drawings to be submitted with tender
xxxxxxxxx
xxxxxxxxx
Single copies of drawings shall be submitted as part of the
original tender showing the following detail:
xxxxxxxxx
xxxxxxxxx
kV
27
Silicone
Polymer
mm
mm
mm
226
xxxxxxxxx
xxxxxxxxx
50
xxxxxxxxx
50
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
27 of 172
Page:
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping arrangement
Reference
Number:
8.4
Details of grading rings
Reference
Number:
8.5
Arrester characteristic data required
xxxxxxxxx
8.5.1
V-I characteristic curve, AC
Reference
Number:
8.5.2
V-I characteristic curve, DC
Reference
Number:
8.5.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
Reference
Number:
8.5.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
xxxxxxxxx
8.5.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
8.5.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
8.5.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
9
Physical dimensions of arresters
9.1
Overall height of arrester
mm
xxxxxx
9.2
Minimum external flashover distance
mm
200
9.3
External diameter of arrester housing
mm
xxxxxx
9.4
Diameter of voltage grading rings
mm
xxxxxx
9.5
Distance of grading ring from top of arrester
mm
xxxxxx
10
MOV elements
10.1
Diameter elements
mm
xxxxxx
10.2
Thickness elements
mm
xxxxxx
10.3
Number of elements per arrester
xxxxxx
10.4
Number of stacks in parallel
0
11
Miscellaneous
xxxxxxxxx
11.1
Live spray washing (Yes/No)
No
11.2
Total mass of assembled unit
xxxxxxxxx
xxxxxxxxx
o
11.3
Minimum expected life of arrester at 40 C and MCOV
11.4
Sample available for inspection
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
28 of 172
Page:
11.5
Declared specified long-term load
kN
xxxxxx
11.6
Insulation withstand test (Reference number of test report)
11.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
kV
48
11.8
60 s wet power frequency withstand
r.m.s
kV
22
11.9
Residual voltage test (Reference number of test report)
11.10
Maximum residual voltage for a 10kA steep current impulse
(1/20μs)
11.11
Maximum residual voltage for a lightning current impulse
(8/20μs) of magnitude:
11.11.1
5 kA
kV
xxxxxxx
11.11.2
10 kA
kV
27
11.11.3
20 kA
kV
xxxxxx
11.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
11.13
Long duration current impulse withstand test
xxxxxxxxx
11.13.1
Reference number of test report
xxxxxx
11.13.2
Charging voltage
xxxxxxx
xxxxxxxxxx
kV
30
xxxxxxxxx
pu of
Ur
or
11.13.3
Charging current
A
xxxxxx
11.13.4
Virtual duration of peak
μs
2000
11.13.5
Number of discharge operations
18
11.13.6
Number of grouped operations
6
11.13.7
Operations per group
3
11.13.8
Maximum interval between operations
11.13.9
Interval between operations
11.13.10
Maximum permitted change in residual voltage after long
duration current impulse withstand test
11.14
Operating duty test
xxxxxxxxx
11.14.1
Reference number of test report
xxxxxx
Conditioning part 1:
xxxxxxxxx
xxxxxxxxx
60
Cool to
ambient
%
5
11.14.2
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
11.14.3
Number of discharge operations
20
11.14.4
Number of grouped operations
4
11.14.5
Operations per group
5
11.14.6
Interval between operations
s
60
11.14.7
Intervals between groups
min
30
Conditioning part 2:
xxxxxxxxx
3.2
xxxxxxxxx
s
xxxxxxxxx
kV
xxxxxxxxx
xxxxxxxxx
8.7
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
29 of 172
Page:
11.14.8
High current impulse (4/10μs)
11.14.9
Number of applications
2
11.15
Conditions for switching surge test
xxxxxxxxx
11.15.1
Charging voltage
kA
pu of
Ur
or
100
xxxxxxxxx
3.2
xxxxxxxxx
11.15.2
Charging current
A
xxxxxxxx
11.15.3
Virtual duration of peak
μs
2000
11.15.4
Number of discharge operations
11.15.5
Interval between operations
s
60
11.15.6
Starting temperature for first impulse
o
60
11.15.7
Energy dissipated during second impulse
kJ
xxxxxx
12
Conditions for power frequency test at elevated levels
as in IEC 60099-4, 7.5.2:
12.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.3
Elevated continuous operating voltage (Uc*) applied for 30
min
kV
xxxxxxx
12.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.5
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.6
Short-circuit test (Reference number of test report)
xxxxxx
12.6.1
High current
kA
r.m.s
40
12.6.2
Low current
kA
r.m.s
0.6 ± 0.2
12.7
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.8
Internal partial discharge test (Reference number of test
report)
12.8.1
Power frequency voltage applied [1.05 x MCOV]
kV
7.7
12.8.2
Maximum partial discharge
pC
10
12.9
Moisture ingress test (Reference number of test report)
xxxxxx
12.10
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
xxxxxxxxx
2A
Yes
2B
No
xxxxxxxxx
xxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
30 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 3A AND 3B: STATION CLASS SURGE
ARRESTERS FOR 11 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule
A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxxxxx
1.3
Product code
2
Operating conditions:
xxxxxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class
D
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
11
2.12
Maximum system voltage
kV
12
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester
95
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
31 of 172
Page:
3.7
MCOV (Uc)
kV
12
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
kV
45
4
Arrester housing
4.1
Housing material
4.3
Minimum external creepage distance
4.3.1
Item 3A and 3B [Um x 25 mm/kV]
4..4
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
4.4.1
c
xxxxxxxxx
4.4.2
s/p
xxxxxxxxx
4.4.3
Ld/d
xxxxxxxxx
4.4.4
P1 - P2
xxxxxxxxx
4.4.5
CF
xxxxxxxxx
4.4.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing mounting details
xxxxxx
6
Arrester line terminal
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and spring washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring washer
Yes
7.6
Material
xxxxxxx
7.7
Reference number of drawing showing details of line
terminal
xxxxxxx
8
Drawings to be submitted with tender
xxxxxxxxx
mm
mm
mm
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
300
xxxxxxxxx
xxxxxxxxx
50
xxxxxxxxx
50
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
32 of 172
Page:
Single copies of drawings shall be submitted as part of the
original tender showing the following detail:
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping arrangement
Reference
Number:
8.4
Details of grading rings
8.5
Arrester characteristic data required
8.5.1
V-I characteristic curve, AC
Reference
Number:
8.5.2
V-I characteristic curve, DC
Reference
Number:
8.5.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
8.5.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
8.5.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
8.5.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
8.5.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
9
Physical dimensions of arresters
9.1
Overall height of arrester
mm
xxxxxx
9.2
Minimum external flashover distance
mm
200
9.3
External diameter of arrester housing
mm
xxxxxx
9.4
Diameter of voltage grading rings
mm
xxxxxx
9.5
Distance of grading ring from top of arrester
mm
xxxxxx
10
MOV elements
10.1
Diameter elements
mm
xxxxxxx
10.2
Thickness elements
mm
xxxxxxx
10.3
Number of elements per arrester
xxxxxxx
10.4
Number of stacks in parallel
11
Miscellaneous
0
xxxxxxxxx
11.1
Live spray washing (Yes/No)
No
11.2
Total mass of assembled unit
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
11.3
Minimum expected life of arrester at 40 C and MCOV
11.4
Sample available for inspection
11.5
Declared specified long-term load
11.6
Insulation withstand test (Reference number of test report)
Kg
xxxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
kN
xxxxxxx
xxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
33 of 172
Page:
11.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
kV
71
11.8
60 s wet power frequency withstand
r.m.s
kV
28
11.9
Residual voltage test (Reference number of test report)
11.10
Maximum residual voltage for a 10kA steep current impulse
(1/20μs)
11.11
Maximum residual voltage for a lightning current impulse
(8/20μs) of magnitude:
11.11.1
xxxxxxxxxx
kV
49
5 kA
kV
xxxxxxx
11.11.2
10 kA
kV
45
11.11.3
20 kA
kV
xxxxxxx
11.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxxx
11.13
Long duration current impulse withstand test
xxxxxxxxx
11.13.1
Reference number of test report
xxxxxx
11.13.2
Charging voltage
pu of
Ur
3.2
xxxxxxxxx
or
xxxxxxxxx
xxxxxxxxx
11.13.3
Charging current
A
xxxxxx
11.13.4
Virtual duration of peak
μs
2000
11.13.5
Number of discharge operations
18
11.13.6
Number of grouped operations
6
11.13.7
Operations per group
3
11.13.8
Maximum interval between operations
11.13.9
Interval between operations
11.13.10
Maximum permitted change in residual voltage after long
duration current impulse withstand test
11.14
Operating duty test
xxxxxxxxx
xxxxxxxxx
11.14.1
Reference number of test report
xxxxxx
xxxxxxxxx
xxxxxxxxx
s
60
Cool to
ambient
%
Conditioning part 1:
5
11.14.2
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
11.14.3
Number of discharge operations
20
11.14.4
Number of grouped operations
4
11.14.5
Operations per group
5
11.14.6
Interval between operations
s
60
11.14.7
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
11.14.8
High current impulse (4/10μs)
11.14.9
Number of applications
kA
14.5
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
34 of 172
Page:
11.15
Conditions for switching surge test
11.15.1
Charging voltage
pu of
Ur
3.2
xxxxxxxxx
or
11.15.2
Charging current
A
xxxxxxxxx
11.15.3
Virtual duration of peak
μs
2000
11.15.4
Number of discharge operations
11.15.5
Interval between operations
s
60
11.15.6
Starting temperature for first impulse
o
60
11.15.7
Energy dissipated during second impulse
kJ
12
Conditions for power frequency test at elevated levels
as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.3
Elevated continuous operating voltage (Uc*) applied for 30
min
kV
xxxxxxx
12.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.5
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.6
Short-circuit test (Reference number of test report)
xxxxxx
12.6.1
High current
kA
r.m.s
40
12.6.2
Low current
kA
r.m.s
0.6 ± 0.2
12.7
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.8
Internal partial discharge test (Reference number of test
report)
12.8.1
Power frequency voltage applied [1.05 x MCOV]
kV
12.6
12.8.2
Maximum partial discharge
pC
10
12.9
Moisture ingress test (Reference number of test report)
xxxxxx
12.10
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
3A
Yes
3B
No
xxxxxxxxx
xxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
35 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 4A AND 4B: STATION CLASS SURGE
ARRESTERS FOR 11 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule
A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxxxxx
1.3
Product code
2
Operating conditions:
xxxxxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class
E
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
11
2.12
Maximum system voltage
kV
12
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester
95
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
36 of 172
Page:
3.7
MCOV (Uc)
kV
12
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
kV
45
4
Arrester housing
4.1
Housing material
4.3
Minimum external creepage distance
4.3.1
Item 4A and 4B [Um x 31 mm/kV]
4..4
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
4.4.1
c
xxxxxxxxx
4.4.2
s/p
xxxxxxxxx
4.4.3
Ld/d
xxxxxxxxx
4.4.4
P1 - P2
xxxxxxxxx
4.4.5
CF
xxxxxxxxx
4.4.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing mounting details
xxxxxx
6
Arrester line terminal
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and spring washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring washer
Yes
7.6
Material
xxxxxxx
7.7
Reference number of drawing showing details of line
terminal
xxxxxxx
8
Drawings to be submitted with tender
xxxxxxxxx
mm
mm
mm
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
372
xxxxxxxxx
xxxxxxxxx
50
50
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
37 of 172
Page:
Single copies of drawings shall be submitted as part of the
original tender showing the following detail:
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping arrangement
Reference
Number:
8.4
Details of grading rings
Reference
Number:
8.5
Arrester characteristic data required
8.5.1
V-I characteristic curve, AC
Reference
Number:
8.5.2
V-I characteristic curve, DC
Reference
Number:
8.5.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
Reference
Number:
8.5.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
xxxxxxxxx
8.5.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
8.5.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
8.5.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
9
Physical dimensions of arresters
9.1
Overall height of arrester
mm
xxxxxx
9.2
Minimum external flashover distance
mm
200
9.3
External diameter of arrester housing
mm
xxxxxx
9.4
Diameter of voltage grading rings
mm
xxxxxx
9.5
Distance of grading ring from top of arrester
mm
10
MOV elements
xxxxxx
xxxxxxxxx
10.1
Diameter elements
mm
xxxxxxx
10.2
Thickness elements
mm
xxxxxxx
10.3
Number of elements per arrester
xxxxxxx
10.4
Number of stacks in parallel
11
Miscellaneous
0
xxxxxxxxx
11.1
Live spray washing (Yes/No)
No
11.2
Total mass of assembled unit
xxxxxxxxx
o
11.3
Minimum expected life of arrester at 40 C and MCOV
11.4
Sample available for inspection
11.5
Declared specified long-term load
11.6
Insulation withstand test (Reference number of test report)
Kg
xxxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
kN
xxxxxxx
xxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
38 of 172
Page:
11.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
kV
71
11.8
60 s wet power frequency withstand
r.m.s
kV
28
11.9
Residual voltage test (Reference number of test report)
11.10
Maximum residual voltage for a 10kA steep current impulse
(1/20μs)
11.11
Maximum residual voltage for a lightning current impulse
(8/20μs) of magnitude:
11.11.1
5 kA
kV
xxxxxxx
11.11.2
10 kA
kV
45
11.11.3
20 kA
kV
xxxxxxx
11.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxxx
11.13
Long duration current impulse withstand test
xxxxxxxxx
11.13.1
Reference number of test report
xxxxxx
11.13.2
Charging voltage
xxxxxxxxxx
kV
49
xxxxxxxxx
pu of
Ur
xxxxxxxxx
3.2
xxxxxxxxx
or
xxxxxxxxx
xxxxxxxxx
11.13.3
Charging current
A
xxxxxx
11.13.4
Virtual duration of peak
μs
2000
11.13.5
Number of discharge operations
18
11.13.6
Number of grouped operations
6
11.13.7
Operations per group
3
11.13.8
Maximum interval between operations
11.13.9
Interval between operations
11.13.10
Maximum permitted change in residual voltage after long
duration current impulse withstand test
11.14
Operating duty test
xxxxxxxxx
xxxxxxxxx
11.14.1
Reference number of test report
xxxxxx
xxxxxxxxx
xxxxxxxxx
s
60
Cool to
ambient
%
Conditioning part 1:
5
11.14.2
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
11.14.3
Number of discharge operations
20
11.14.4
Number of grouped operations
4
11.14.5
Operations per group
5
11.14.6
Interval between operations
s
60
11.14.7
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
11.14.8
High current impulse (4/10μs)
11.14.9
Number of applications
kA
14.5
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
39 of 172
Page:
11.15
Conditions for switching surge test
11.15.1
Charging voltage
xxxxxxxxx
pu of
Ur
3.2
xxxxxxxxx
or
xxxxxxxxx
11.15.2
Charging current
A
xxxxxxxxx
11.15.3
Virtual duration of peak
μs
2000
11.15.4
Number of discharge operations
11.15.5
Interval between operations
s
60
11.15.6
Starting temperature for first impulse
o
60
11.15.7
Energy dissipated during second impulse
kJ
12
Conditions for power frequency test at elevated levels
as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.3
Elevated continuous operating voltage (Uc*) applied for 30
min
kV
xxxxxxx
12.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.5
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.6
Short-circuit test (Reference number of test report)
xxxxxx
12.6.1
High current
kA
r.m.s
40
12.6.2
Low current
kA
r.m.s
0.6 ± 0.2
12.7
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.8
Internal partial discharge test (Reference number of test
report)
12.8.1
Power frequency voltage applied [1.05 x MCOV]
kV
12.6
12.8.2
Maximum partial discharge
pC
10
12.9
Moisture ingress test (Reference number of test report)
xxxxxx
12.10
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
4A
Yes
4B
No
xxxxxxxxx
xxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
40 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 5A AND 5B: STATION CLASS SURGE
ARRESTERS FOR 22 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code
2
Operating conditions:
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class
D
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
22
2.12
Maximum system voltage
kV
24
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester
150
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
41 of 172
3.7
MCOV (Uc)
kV
24
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
kV
85
4
Arrester housing
4.1
Housing material: Item 5
4.2
Minimum external creepage distance:
4.2.1
Item 5A and 5B [Um x 25 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc.
List those applicable.
xxxxxxxxx
5
Arrester mounting details:
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing mounting
details
xxxxxx
6
Arrester line terminal:
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and spring
washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal:
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring washer
Yes
7.6
Material
xxxxxx
7.7
Reference number of drawing showing details of line
terminal
xxxxxx
mm
mm
mm
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
600
xxxxxxxxx
xxxxxxxxx
50
xxxxxxxxx
50
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
42 of 172
xxxxxxxxx
8
Drawings to be submitted with tender (Single
copies of drawings shall be submitted as part of
the original tender showing the following detail):
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
Reference
Number:
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in
per unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with
prior duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
320
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.2
Thickness elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
12.3
Minimum expected life of arrester at 40 C and MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
12.6
Insulation withstand test ( Reference number of test
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
kN
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
43 of 172
Page:
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82)
x Ures]
kV
135
12.8
60 s wet power frequency withstand
r.m.s kV
50
12.9
Residual voltage test (Reference number of test report)
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
85
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching
current impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test (
Reference number of test report)
12.13.1
Charging voltage
xxxxxx
kV
97
xxxxxxxxx
xxxxxx
pu of Ur
or
3.2
xxxxxxxxx
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after
long duration current impulse withstand test
12.14
Operating duty test: Reference number of test report
s
60
%
5
xxxxxx
xxxxxxxxx
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x
MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
High current impulse (4/10μs)
12.14.8
Number of applications
12.14.9
Conditions for switching surge test
12.14.9.1
Charging voltage
xxxxxxxxx
Cool to
ambient
Conditioning part 1:
12.14.7
xxxxxxxxx
kA
xxxxxxxxx
29
xxxxxxxxx
100
2
pu of Ur
3.2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
or
44 of 172
xxxxxxxxx
12.14.9.2
Charging current
A
xxxxxx
12.14.9.3
Virtual duration of peak
μs
2000
12.14.9.4
Number of discharge operations
12.14.9.5
Interval between operations
s
60
12.14.9.6
Starting temperature for first impulse
o
60
12.14.9.7
Energy dissipated during second impulse
kJ
12.15
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.15.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.15.3
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.15.4
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.15.5
Maximum permitted change in residual voltage after
long duration current impulse withstand test
%
5
12.16
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.17
Short-circuit test (Reference number of test report)
xxxxxx
12.18
High current
kA r.m.s
40
12.19
Low current
kA r.m.s
0.6 ± 0.2
12.20
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.21
Internal partial discharge test (Reference number of
test report)
12.22
Power frequency voltage applied [1.05 x MCOV]
kV
25
12.23
Maximum partial discharge
pC
10
12.24
Moisture ingress test (Reference number of test report)
xxxxxx
12.25
Bending moment test (Reference number of test
report)
xxxxxx
xxxxxxxxx
2
C
5A
Yes
5B
No
xxxxxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
45 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 6A AND 6B: STATION CLASS SURGE
ARRESTERS FOR 22 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of
factory
xxxxxx
1.3
Product code
2
Operating conditions:
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
xxxxxx
xxxxxxxxx
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class
E
2.8
Lightning activity
High
2.9
System earthing
Non-effective
2.10
System configuration
3 phase, 3 wire
2.11
Nominal system voltage (Un)
kV
22
2.12
Maximum system voltage
kV
24
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester
150
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single
high current impulse, 100kA 4/10μs in per unit of
MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
24
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
46 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing
xxxxxxxxx
xxxxxxxxx
4.1
Housing material:
4.2
Minimum external creepage distance:
Silicone Polymer
xxxxxxxxx
xxxxxxxxx
4.2.1
Item 6A and 6B [Um x 31 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib,
etc. List those applicable.
xxxxxxxxx
5
Arrester mounting details:
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing mounting
details
xxxxxx
6
Arrester line terminal:
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and spring
washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of
line terminal
xxxxxx
7
Arrester earth terminal:
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring
washer
Yes
7.6
Material
xxxxxx
7.7
Reference number of drawing showing details of
line terminal
xxxxxx
8
Drawings to be submitted with tender (Single
copies of drawings shall be submitted as part of
the original tender showing the following
kV
mm
mm
mm
85
744
xxxxxxxxx
50
xxxxxxxxx
50
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
47 of 172
Page:
detail):
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve
in per unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with
prior duty as defined in Appendix D, IEC 600994:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
320
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.2
Thickness elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
o
12.3
Minimum expected life of arrester at 40 C and
MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
Yes
kN
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
48 of 172
Page:
12.6
Insulation withstand test ( Reference number of test
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
kV
135
12.8
60 s wet power frequency withstand
r.m.s
kV
50
12.9
Residual voltage test (Reference number of test report)
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
85
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test
(Reference number of test report)
12.13.1
Charging voltage
xxxxxx
xxxxxx
kV
97
xxxxxxxxx
xxxxxxxxx
xxxxxx
pu of
Ur
3.2
xxxxxxxxx
or
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after long
duration current impulse withstand test
12.14
Operating duty test: Reference number of test report
s
xxxxxxxxx
60
Cool to
ambient
%
5
xxxxxx
Conditioning part 1:
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
12.14.7
High current impulse (4/10μs)
12.14.8
Number of applications
kA
29
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
49 of 172
Page:
12.14.9
Conditions for switching surge test
12.14.9.1
Charging voltage
pu of
Ur
3.2
xxxxxxxxx
or
12.14.9.2
Charging current
A
xxxxxx
12.14.9.3
Virtual duration of peak
μs
2000
12.14.9.4
Number of discharge operations
12.14.9.5
Interval between operations
s
60
12.14.9.6
Starting temperature for first impulse
o
60
12.14.9.7
Energy dissipated during second impulse
kJ
12.15
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.15.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.15.3
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.15.4
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.15.5
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.16
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.17
Short-circuit test (Reference number of test report)
xxxxxx
12.18
High current
kA
r.m.s
40
12.19
Low current
kA
r.m.s
0.6 ± 0.2
12.20
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.21
Internal partial discharge test (Reference number of test
report)
12.22
Power frequency voltage applied [1.05 x MCOV]
kV
25
12.23
Maximum partial discharge
pC
10
12.24
Moisture ingress test (Reference number of test report)
xxxxxx
12.25
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
6A
Yes
6B
No
xxxxxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
50 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 7A AND 7B: STATION CLASS SURGE
ARRESTERS FOR 33 AND 44 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of
factory
xxxxxx
1.3
Product code
2
Operating conditions
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
xxxxxx
xxxxxxxxx
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
D
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3 wire
2.11
Nominal system voltage (Un)
kV
33
44
2.12
Maximum system voltage
kV
36
48
2.13
Supply frequency
Hz
50
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
200
250
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a
single high current impulse, 100kA 4/10μs in per
unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
Effective
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
51 of 172
Page:
3.7
MCOV (Uc)
kV
36
3.8
Maximum residual voltage (Ures) at 10kA
(8/20μs)
kV
125
4
Arrester housing
xxxxxxxxx
xxxxxxxxx
4.1
Housing material:
4.2
Minimum external creepage distance:
Silicone Polymer
xxxxxxxxx
xxxxxxxxx
4.2.1
Item 7A and 7B [Um x 25 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no
deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib,
etc. List those applicable.
xxxxxxxxx
5
Arrester mounting details:
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing
mounting details
xxxxxx
6
Arrester line terminal:
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and
spring washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of
line terminal
xxxxxx
7
Arrester earth terminal:
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring
washer
Yes
7.6
Material
xxxxxx
7.7
Reference number of drawing showing details of
xxxxxx
mm
mm
mm
1200
xxxxxxxxx
xxxxxxxxx
50
xxxxxxxxx
50
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
52 of 172
Page:
line terminal
xxxxxxxxx
8
Drawings to be submitted with tender (Single
copies of drawings shall be submitted as
part of the original tender showing the
following details)
8.1
Outline dimensions of arrester, fit as for service
Reference Number:
8.2
Mounting details
Reference Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference Number:
8.4
Details of grading rings
Reference Number:
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference Number:
9.2
V-I characteristic curve, DC
Reference Number:
9.3
Temporary overvoltage withstand capability
curve in per unit of MCOV, with and without
prior duty
Reference Number:
9.4
Arrester temporary overvoltage capability,
with prior duty as defined in Appendix D, IEC
60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
400
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.2
Thickness elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
12.3
Minimum expected life of arrester at 40 C and
MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of
xxxxxxxxx
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
o
Yes
kN
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
53 of 172
Page:
test report)
12.7
Lightning impulse (1.2/50μs) withstand level
[(1.3/0.82) x Ures]
kV
198
12.8
60 s wet power frequency withstand
r.m.s
kV
70
12.9
Residual voltage test (Reference number of
test report)
12.10
Maximum residual voltage for a 10kA steep
current impulse (1/20μs)
12.11
Maximum residual voltage for a lightning
current impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
125
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching
current impulse
kV
xxxxxx
12.13
Long duration current impulse withstand
test (Reference number of test report)
12.13.1
Charging voltage
xxxxxx
kV
140
xxxxxxxxx
xxxxxx
pu of Ur
or
3.2
xxxxxxxxx
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.6
Maximum interval between operations
12.13.7
Interval between operations
12.13.8
Maximum permitted change in residual voltage
after long duration current impulse withstand
test
12.14
Operating duty test (Reference number of test
report)
xxxxxx
Conditioning part 1:
xxxxxxxxx
s
Cool to ambient
%
5
10 kA current impulse (8/20μs), energized at 1.2
x MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
High current impulse (4/10μs)
12.14.8
Number of applications
xxxxxxxxx
60
12.14.1
12.14.7
xxxxxxxxx
kA
xxxxxxxxx
43
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
54 of 172
Page:
12.14.9
Conditions for switching surge test:
12.14.9.1
Charging voltage
pu of Ur
or
xxxxxxxxx
xxxxxxxxx
3.2
xxxxxxxxx
xxxxxxxxx
12.14.9.2
Charging current
A
xxxxxx
12.14.9.3
Virtual duration of peak
μs
2000
12.14.9.4
Number of discharge operations
12.14.9.5
Interval between operations
s
60
12.14.9.6
Starting temperature for first impulse
o
60
12.14.9.7
Energy dissipated during second impulse
kJ
12.15
Conditions for power frequency test at
elevated levels as in IEC 60099-4, 7.5.2
xxxxxx
xxxxxxxxx
12.15.1
Interval between last long duration current
impulse and power frequency test
ms
100
12.15.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.15.3
Elevated continuous operating voltage (Uc*)
applied for 30 min
kV
xxxxxx
12.15.4
Maximum permitted change in residual voltage
after long duration current impulse withstand
test
%
5
12.16
Power frequency voltage versus time
characteristic (Reference number of test report)
xxxxxx
12.17
Short-circuit test (Reference number of test
report)
xxxxxx
12.17.1
High current
kA
r.m.s
40
12.17.2
Low current
kA
r.m.s
0.6 ± 0.2
12.18
KIPTS Natural ageing and pollution
performance test (Reference number of test
report)
2
C
xxxxxxxxx
7A
Yes
7B
No
12.19
Internal partial discharge test (Reference
number of test report)
12.20
Power frequency voltage applied [1.05 x MCOV]
kV
38
12.21
Maximum partial discharge
pC
10
12.22
Moisture ingress test (Reference number of test
report)
xxxxxx
12.23
Bending moment test (Reference number of test
report)
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
55 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 8A AND 8B: STATION CLASS SURGE
ARRESTERS FOR 33 AND 44 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of
factory
xxxxxx
1.3
Product code:
2
Operating conditions
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
xxxxxx
xxxxxxxxx
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
E
2.8
Lightning activity
High
2.9
System earthing
Noneffective
2.10
System configuration
3 phase, 3 wire
2.11
Nominal system voltage (Un)
kV
33
44
2.12
Maximum system voltage
kV
36
48
2.13
Supply frequency
Hz
50
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
200
250
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a
single high current impulse, 100kA 4/10μs in per
unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
Effective
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
56 of 172
Page:
3.7
MCOV (Uc)
kV
36
3.8
Maximum residual voltage (Ures) at 10kA
(8/20μs)
kV
125
4
Arrester housing
xxxxxxxxx
xxxxxxxxx
4.1
Housing material:
4.2
Minimum external creepage distance:
Silicone Polymer
xxxxxxxxx
xxxxxxxxx
4.2.1
Item 8A and 8B [Um x 31 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no
deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib,
etc. List those applicable.
xxxxxxxxx
5
Arrester mounting details:
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Base
5.3
Reference number of drawing showing
mounting details
xxxxxx
6
Arrester line terminal:
xxxxxxxxx
6.1
Type
Threaded
6.2
Diameter
M12
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Supplied with: M12 nut, two flat washers and
spring washer
Yes
6.6
Material
xxxxxx
6.7
Reference number of drawing showing details of
line terminal
xxxxxx
7
Arrester earth terminal:
xxxxxxxxx
7.1
Type
Threaded
7.2
Diameter
M12
7.3
Minimum length
7.4
Orientation
Vertical
7.5
Supplied with nut, two flat washers and spring
washer
Yes
7.6
Material
xxxxxx
7.7
Reference number of drawing showing details of
xxxxxx
mm
mm
mm
1488
xxxxxxxxx
xxxxxxxxx
50
xxxxxxxxx
50
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
57 of 172
Page:
line terminal
xxxxxxxxx
8
Drawings to be submitted with tender (Single
copies of drawings shall be submitted as
part of the original tender showing the
following detail)
8.1
Outline dimensions of arrester, fit as for service
Reference Number:
8.2
Mounting details
Reference Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference Number:
8.4
Details of grading rings
9
Arrester characteristic data required:
Reference Number:
xxxxxxxxx
9.1
V-I characteristic curve, AC
Reference Number:
9.2
V-I characteristic curve, DC
Reference Number:
9.3
Temporary overvoltage withstand capability
curve in per unit of MCOV, with and without
prior duty
Reference Number:
9.4
Arrester temporary overvoltage capability,
with prior duty as defined in Appendix D, IEC
60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
400
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.2
Thickness elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
xxxxxxxxx
xxxxxxxxx
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
o
12.3
Minimum expected life of arrester at 40 C and
MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of
Yes
kN
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
58 of 172
Page:
test report)
12.7
Lightning impulse (1.2/50μs) withstand level
[(1.3/0.82) x Ures]
kV
198
12.8
60 s wet power frequency withstand
r.m.s
kV
70
12.9
Residual voltage test (Reference number of
test report)
12.10
Maximum residual voltage for a 10kA steep
current impulse (1/20μs)
12.11
Maximum residual voltage for a lightning
current impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
125
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching
current impulse
kV
xxxxxx
12.13
Long duration current impulse withstand
test (Reference number of test report)
12.13.1
Charging voltage
xxxxxx
kV
140
xxxxxxxxx
xxxxxx
pu of Ur
or
3.2
xxxxxxxxx
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.6
Maximum interval between operations
12.13.7
Interval between operations
12.13.8
Maximum permitted change in residual voltage
after long duration current impulse withstand
test
12.14
Operating duty test (Reference number of test
report)
xxxxxx
Conditioning part 1:
xxxxxxxxx
s
Cool to ambient
%
5
10 kA current impulse (8/20μs), energized at 1.2
x MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
High current impulse (4/10μs)
12.14.8
Number of applications
xxxxxxxxx
60
12.14.1
12.14.7
xxxxxxxxx
kA
xxxxxxxxx
43
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
59 of 172
Page:
12.14.9
Conditions for switching surge test:
12.14.9.1
Charging voltage
pu of Ur
or
3.2
xxxxxxxxx
12.14.9.2
Charging current
A
xxxxxx
12.14.9.3
Virtual duration of peak
μs
2000
12.14.9.4
Number of discharge operations
12.14.9.5
Interval between operations
s
60
12.14.9.6
Starting temperature for first impulse
o
60
12.14.9.7
Energy dissipated during second impulse
kJ
12.15
Conditions for power frequency test at
elevated levels as in IEC 60099-4, 7.5.2
xxxxxx
xxxxxxxxx
12.15.1
Interval between last long duration current
impulse and power frequency test
ms
100
12.15.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.15.3
Elevated continuous operating voltage (Uc*)
applied for 30 min
kV
xxxxxx
12.15.4
Maximum permitted change in residual voltage
after long duration current impulse withstand
test
%
5
12.16
Power frequency voltage versus time
characteristic (Reference number of test report)
xxxxxx
12.17
Short-circuit test (Reference number of test
report)
xxxxxx
12.17.1
High current
kA
r.m.s
40
12.17.2
Low current
kA
r.m.s
0.6 ± 0.2
12.18
KIPTS Natural ageing and pollution
performance test (Reference number of test
report)
xxxxxxxxx
2
C
xxxxxxxxx
8A
Yes
8B
No
12.19
Internal partial discharge test (Reference
number of test report)
12.20
Power frequency voltage applied [1.05 x MCOV]
kV
38
12.21
Maximum partial discharge
pC
10
12.22
Moisture ingress test (Reference number of test
report)
xxxxxx
12.23
Bending moment test (Reference number of test
report)
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
60 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 9A AND 9B: STATION CLASS SURGE
ARRESTERS FOR 66 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code:
2
Operating conditions
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
D
2.8
Lightning activity
High
2.9
System earthing
Effective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
66
2.12
Maximum system voltage
kV
73
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester
350
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
48
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
61 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing
4.1
Housing material:
4.2
Minimum external creepage distance:
4.2.1
Item 9A and 9B [Um x 25 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc.
List those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
5.5
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6
flat washers
Yes
5.6
Reference number of drawing showing mounting
details
xxxxxx
6
Arrester line terminal
xxxxxxxxx
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
xxxxxx
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
xxxxxxxxx
Earth terminal to be provided with clamping
arrangement suitable for clamping of the following
conductor:
xxxxxxxxx
xxxxxxxxx
7.1
Conductor material
Copper
7.2
Conductor type
Strap
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
kV
mm
mm
mm
165
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
1825
xxxxxxxxx
xxxxxxxxx
100
50 x 3
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
62 of 172
Page:
7.6
Reference number of drawing showing details of earth
terminal
8
Drawings to be submitted with tender (Single
copies of drawings shall be submitted as part of
the original tender showing the following detail)
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in
per unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with
prior duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
450
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.12
Thickness elements
mm
xxxxxx
11.13
Number of elements per arrester
xxxxxx
11.14
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
xxxxxx
xxxxxxxxx
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
12.3
Minimum expected life of arrester at 40 C and MCOV
12.4
Sample available for inspection
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
63 of 172
Page:
12.5
Declared specified long-term load
kN
xxxxxx
12.6
Insulation withstand test (Reference number of test
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82)
x Ures]
kV
262
12.8
60 s wet power frequency withstand
r.m.s kV
90
12.9
Residual voltage test (Reference number of test report)
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
165
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test
(Reference number of test report)
12.13.1
Charging voltage
xxxxxx
xxxxxx
kV
183
xxxxxxxxx
xxxxxx
pu of Ur
or
3.2
xxxxxxxxx
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.3
Number of discharge operations
18
12.13.4
Number of grouped operations
6
12.13.5
Operations per group
3
12.13.6
Maximum interval between operations
12.13.7
Interval between operations
12.13.8
Maximum permitted change in residual voltage after
long duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
60
%
5
xxxxxx
xxxxxxxxx
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x
MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
High current impulse (4/10μs)
12.14.8
Number of applications
xxxxxxxxx
Cool to
ambient
Conditioning part 1:
12.14.7
xxxxxxxxx
kA
xxxxxxxxx
58
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
12.15
Conditions for switching surge test:
12.15.1
Charging voltage
pu of Ur
or
64 of 172
xxxxxxxxx
xxxxxxxxx
3.2
xxxxxxxxx
xxxxxxxxx
12.15.2
Charging current
A
xxxxxx
12.15.3
Virtual duration of peak
μs
2000
12.15.3
Number of discharge operations
12.15.4
Interval between operations
s
60
12.15.5
Starting temperature for first impulse
o
60
12.15.6
Energy dissipated during second impulse
kJ
12.16
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.16.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.16.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.16.3
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.16.4
Maximum permitted change in residual voltage after
long duration current impulse withstand test
%
5
12.17
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.18
Short-circuit test (Reference number of test report)
xxxxxx
12.18.1
High current
kA r.m.s
40
12.18.1
Low current
kA r.m.s
0.6 ± 0.2
12.19
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.20
Internal partial discharge test (Reference number of
test report)
12.21
Power frequency voltage applied [1.05 x MCOV]
kV
50.5
12.22
Maximum partial discharge
pC
10
12.23
Moisture ingress test (Reference number of test report)
xxxxxx
12.24
Bending moment test (Reference number of test report)
xxxxxx
2
C
9A
Yes
9B
No
xxxxxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
65 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 10A AND10B: STATION CLASS SURGE
ARRESTERS FOR 66 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code:
2
Operating conditions
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
E
2.8
Lightning activity
High
2.9
System earthing
Effective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
66
2.12
Maximum system voltage
kV
73
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester
350
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
48
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
66 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing
4.1
Housing material:
4.2
Minimum external creepage distance:
4.2.1
Item 10A and 10B [Um x 31 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc.
List those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
5.5
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6
flat washers
Yes
5.6
Reference number of drawing showing mounting
details
xxxxxx
6
Arrester line terminal
xxxxxxxxx
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
xxxxxx
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
xxxxxxxxx
Earth terminal to be provided with clamping
arrangement suitable for clamping of the following
conductor:
xxxxxxxxx
xxxxxxxxx
7.1
Conductor material
Copper
7.2
Conductor type
Strap
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
kV
mm
mm
mm
165
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
2263
xxxxxxxxx
xxxxxxxxx
100
50 x 3
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
67 of 172
Page:
7.6
Reference number of drawing showing details of earth
terminal
8
Drawings to be submitted with tender (Single
copies of drawings shall be submitted as part of
the original tender showing the following detail)
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in
per unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with
prior duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
450
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.12
Thickness elements
mm
xxxxxx
11.13
Number of elements per arrester
xxxxxx
11.14
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
xxxxxx
xxxxxxxxx
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
12.3
Minimum expected life of arrester at 40 C and MCOV
12.4
Sample available for inspection
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
68 of 172
Page:
12.5
Declared specified long-term load
kN
xxxxxx
12.6
Insulation withstand test (Reference number of test
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82)
x Ures]
kV
262
12.8
60 s wet power frequency withstand
r.m.s kV
90
12.9
Residual voltage test (Reference number of test report)
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
165
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test
(Reference number of test report)
12.13.1
Charging voltage
xxxxxx
xxxxxx
kV
183
xxxxxxxxx
xxxxxx
pu of Ur
or
3.2
xxxxxxxxx
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.3
Number of discharge operations
18
12.13.4
Number of grouped operations
6
12.13.5
Operations per group
3
12.13.6
Maximum interval between operations
12.13.7
Interval between operations
12.13.8
Maximum permitted change in residual voltage after
long duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
60
%
5
xxxxxx
xxxxxxxxx
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x
MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
High current impulse (4/10μs)
12.14.8
Number of applications
xxxxxxxxx
Cool to
ambient
Conditioning part 1:
12.14.7
xxxxxxxxx
kA
xxxxxxxxx
58
xxxxxxxxx
100
2
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
12.15
Conditions for switching surge test:
12.15.1
Charging voltage
pu of Ur
or
69 of 172
xxxxxxxxx
xxxxxxxxx
3.2
xxxxxxxxx
xxxxxxxxx
12.15.2
Charging current
A
xxxxxx
12.15.3
Virtual duration of peak
μs
2000
12.15.3
Number of discharge operations
12.15.4
Interval between operations
s
60
12.15.5
Starting temperature for first impulse
o
60
12.15.6
Energy dissipated during second impulse
kJ
12.16
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.16.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.16.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.16.3
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.16.4
Maximum permitted change in residual voltage after
long duration current impulse withstand test
%
5
12.17
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.18
Short-circuit test (Reference number of test report)
xxxxxx
12.18.1
High current
kA r.m.s
40
12.18.1
Low current
kA r.m.s
0.6 ± 0.2
12.19
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.20
Internal partial discharge test (Reference number of
test report)
12.21
Power frequency voltage applied [1.05 x MCOV]
kV
50.5
12.22
Maximum partial discharge
pC
10
12.23
Moisture ingress test (Reference number of test report)
xxxxxx
12.24
Bending moment test (Reference number of test report)
xxxxxx
2
C
10A
Yes
10B
No
xxxxxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
70 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 11A AND 11B: STATION CLASS SURGE
ARRESTERS FOR 88 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule
A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code:
2
Operating conditions:
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
D
2.9
Lightning activity
High
2.10
System earthing
Effective
2.11
System configuration
3 phase, 3
wire
2.12
Nominal system voltage (Un)
kV
88
2.13
Maximum system voltage
kV
97
2.14
Supply frequency
Hz
50
2.15
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
380
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
56
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
71 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing:
4.1
Housing material:
4.2
Minimum external creepage distance:
4.2.1
Item 11A and 11B [Um x 25 mm/kV]
4.3
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details:
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod
base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
5.5
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6 flat
washers
5.6
Reference number of drawing showing mounting details
6
Arrester line terminal:
xxxxxx
xxxxxxxxx
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
xxxxxxxxx
7
Arrester earth terminal:
xxxxxxxxx
xxxxxxxxx
Earth terminal to be provided with clamping arrangement
suitable for clamping of the following conductor:
xxxxxxxxx
xxxxxxxxx
7.1
Conductor material
Copper
7.2
Conductor type
Strap
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
kV
mm
210
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
2425
xxxxxxxxx
Yes
mm
mm
xxxxxxxxx
100
50 x 3
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
72 of 172
Page:
7.6
Reference number of drawing showing details of earth
terminal
8
Drawings to be submitted with tender (Single copies of
drawings shall be submitted as part of the original
tender showing the following detail)
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in per unit
of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
900
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.2
Thickness elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
12.3
xxxxxx
xxxxxxxxx
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
Minimum expected life of arrester at 40 C and MCOV
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
73 of 172
Page:
12.4
Sample available for inspection
Yes
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of test report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
kV
333
12.8
60 s wet power frequency withstand
r.m.s
kV
150
12.9
Residual voltage test (Reference number of test report)
12.10
Maximum residual voltage for a 10kA steep current impulse
(1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
210
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test
(Reference number of test report)
12.13.1
Charging voltage
kN
xxxxxx
xxxxxx
xxxxxx
kV
227
xxxxxxxxx
xxxxxx
pu of
Ur
3.2
xxxxxxxxx
or
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after long
duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
60
%
5
xxxxxx
xxxxxxxxx
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
High current impulse (4/10μs)
xxxxxxxxx
Cool to
ambient
Conditioning part 1:
12.14.7
xxxxxxxxx
kA
xxxxxxxxx
67
xxxxxxxxx
100
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
74 of 172
Page:
12.14.8
Number of applications
12.14.9
Conditions for switching surge test
12.14.9.1
Charging voltage
2
xxxxxxxxx
pu of
Ur
3.2
xxxxxxxxx
or
xxxxxxxxx
12.14.9.2
Charging current
A
xxxxxx
12.14.9.3
Virtual duration of peak
μs
2000
12.14.9.4
Number of discharge operations
12.14.9.5
Interval between operations
s
60
12.14.9.6
Starting temperature for first impulse
o
60
12.14.9.7
Energy dissipated during second impulse
kJ
12.15
Conditions for power frequency test at elevated levels
as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.15.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.15.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.15.3
Elevated continuous operating voltage (Uc*) applied for 30
min
kV
xxxxxx
12.15.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.16
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.17
Short-circuit test (Reference number of test report)
xxxxxx
12.17.1
High current
kA
r.m.s
40
12.17.2
Low current
kA
r.m.s
0.6 ± 0.2
12.18
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.18
Internal partial discharge test (Reference number of test
report)
12.19
Power frequency voltage applied [1.05 x MCOV]
kV
59
12.20
Maximum partial discharge
pC
10
12.21
Moisture ingress test (Reference number of test report)
xxxxxx
12.22
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
11A
Yes
11B
No
xxxxxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
75 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 12A AND 12B: STATION CLASS SURGE
ARRESTERS FOR 88 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule
A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code:
2
Operating conditions:
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
E
2.9
Lightning activity
High
2.10
System earthing
Effective
2.11
System configuration
3 phase, 3
wire
2.12
Nominal system voltage (Un)
kV
88
2.13
Maximum system voltage
kV
97
2.14
Supply frequency
Hz
50
2.15
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
380
xxxxxxxxx
3.1
Arrester classification
Station
class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
56
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
76 of 172
Page:
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
4
Arrester housing:
4.1
Housing material
4.2
Minimum external creepage distance:
4.2.1
Item 12A and 12B [Um x 31 mm/kV]
4.3
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details:
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod
base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
5.5
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6 flat
washers
5.6
Reference number of drawing showing mounting details
6
Arrester line terminal:
xxxxxx
xxxxxxxxx
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
xxxxxxxxx
xxxxxxxxx
7
Arrester earth terminal:
xxxxxxxxx
xxxxxxxxx
Earth terminal to be provided with clamping arrangement
suitable for clamping of the following conductor:
xxxxxxxxx
xxxxxxxxx
7.1
Conductor material
Copper
7.2
Conductor type
Strap
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
kV
mm
210
xxxxxxxxx
xxxxxxxxx
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
3007
xxxxxxxxx
Yes
mm
mm
xxxxxxxxx
100
50 x 3
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
77 of 172
Page:
7.6
Reference number of drawing showing details of earth
terminal
8
Drawings to be submitted with tender (Single copies of
drawings shall be submitted as part of the original
tender showing the following detail)
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required:
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in per unit
of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters:
10.1
Overall height of arrester
mm
xxxxxx
10.2
Minimum external flashover distance
mm
900
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter elements
mm
xxxxxx
11.2
Thickness elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
12.3
xxxxxx
xxxxxxxxx
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
Minimum expected life of arrester at 40 C and MCOV
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
78 of 172
Page:
12.4
Sample available for inspection
Yes
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of test report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
kV
333
12.8
60 s wet power frequency withstand
r.m.s
kV
150
12.9
Residual voltage test (Reference number of test report)
12.10
Maximum residual voltage for a 10kA steep current impulse
(1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
210
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test
(Reference number of test report)
12.13.1
Charging voltage
kN
xxxxxx
xxxxxx
xxxxxx
kV
227
xxxxxxxxx
xxxxxxxxx
xxxxxx
pu of
Ur
3.2
or
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after long
duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
60
Cool to
ambient
%
5
xxxxxx
xxxxxxxxx
Conditioning part 1:
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
12.14.7
High current impulse (4/10μs)
kA
xxxxxxxxx
67
xxxxxxxxx
100
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
79 of 172
Page:
12.14.8
Number of applications
12.14.9
Conditions for switching surge test
12.14.9.1
Charging voltage
2
xxxxxxxxx
pu of
Ur
3.2
xxxxxxxxx
or
xxxxxxxxx
12.14.9.2
Charging current
A
xxxxxx
12.14.9.3
Virtual duration of peak
μs
2000
12.14.9.4
Number of discharge operations
12.14.9.5
Interval between operations
s
60
12.14.9.6
Starting temperature for first impulse
o
60
12.14.9.7
Energy dissipated during second impulse
kJ
12.15
Conditions for power frequency test at elevated levels
as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.15.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.15.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.15.3
Elevated continuous operating voltage (Uc*) applied for 30
min
kV
xxxxxx
12.15.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.16
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.17
Short-circuit test (Reference number of test report)
xxxxxx
12.17.1
High current
kA
r.m.s
40
12.17.2
Low current
kA
r.m.s
0.6 ± 0.2
12.18
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.18
Internal partial discharge test (Reference number of test
report)
12.19
Power frequency voltage applied [1.05 x MCOV]
kV
59
12.20
Maximum partial discharge
pC
10
12.21
Moisture ingress test (Reference number of test report)
xxxxxx
12.22
Bending moment test (Reference number of test report)
xxxxxx
xxxxxxxxx
2
C
12A
Yes
12B
No
xxxxxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
80 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 13A AND 13B: STATION CLASS SURGE
ARRESTERS FOR 132 KV SYSTEMS (25 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code
2
Operating conditions:
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
2.4
Maximum ambient temperature
o
40
2.5
Maximum diurnal variation
o
Item
Description
1
2.3
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class
d
2.8
Lightning activity
High
2.9
System earthing
Effective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
132
2.12
Maximum system voltage
kV
145
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
550
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
84
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
kV
300
4
Arrester housing:
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
81 of 172
Page:
Silicone
Polymer
4.1
Housing material: Item 13
4.2
Minimum external creepage distance:
4.2.1
Item 13A and 13B [Um x 25 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
5.5
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6
flat washers
5.6
Reference number of drawing showing mounting details
6
Arrester line terminal
xxxxxx
xxxxxxxxx
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
xxxxxx
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
mm
3625
xxxxxxxxx
Yes
mm
xxxxxxxxx
100
Earth terminal to be provided with clamping arrangement
suitable for clamping of the following conductor:
7.1
Conductor material
Copper
7.2
Conductor type
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
7.6
Reference number of drawing showing details of earth
terminal
xxxxxx
8
Drawings to be submitted with tender(Single copies
of drawings shall be submitted as part of the original
tender showing the following detail)
Strap
mm
50 x 3
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
82 of 172
Page:
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters
10.1
Overall height of arrester
mm
xxxxxx
10.2
Preferred external flashover distance
mm
1100
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
11
MOV elements:
xxxxxx
xxxxxxxxx
11.1
Diameter of elements
mm
xxxxxx
11.2
Thickness of elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
12.3
Minimum expected life of arrester at 40 C and MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of test
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
Kg
xxxxxx
yrs
30
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
kN
xxxxxx
xxxxxx
kV
476
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
83 of 172
Page:
12.8
60 s wet power frequency withstand
r.m.s kV
230
12.9
Residual voltage test (Reference number of test report
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
300
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test (Reference
number of test report)
12.13.1
Charging voltage
xxxxxx
kV
336
xxxxxxxxx
xxxxxxxxx
xxxxxx
pu of Ur
or
3.2
xxxxxxxxx
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after long
duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
xxxxxxxxx
60
Cool to
ambient
%
5
xxxxxxx
xxxxxxxxx
Conditioning part 1:
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x
MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
xxxxxxxxx
101
5
Conditioning part 2:
12.14.7
High current impulse (4/10μs)
12.14.8
Number of applications
12.15
Conditions for switching surge test:
12.15.1
Charging voltage
kA
xxxxxxxxx
100
2
xxxxxxxxx
pu of Ur
3.2
xxxxxxxxx
or
12.15.2
Charging current
A
xxxxxx
12.15.3
Virtual duration of peak
μs
2000
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
84 of 172
Page:
12.15.4
Number of discharge operations
2
12.15.5
Interval between operations
s
60
12.15.6
Starting temperature for first impulse
o
60
12.15.7
Energy dissipated during second impulse
kJ
12.16
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.16.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.16.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.16.3
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.16.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.17
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.18
Short-circuit test (Reference number of test report)
Xxxxxx
12.18.1
High current
kA r.m.s
40
12.18.2
Low current
kA r.m.s
0.6 ± 0.2
12.19
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.20
Internal partial discharge test (Reference number of test
report)
12.21
Power frequency voltage applied [1.05 x MCOV]
kV
89
12.22
Maximum partial discharge
pC
10
12.23
Moisture ingress test (Reference number of test report)
Xxxxxx
12.24
Bending moment test (Reference number of test report)
Xxxxxx
C
13A
Yes
13B
No
xxxxxxxxx
Xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
85 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 14A AND 14B: STATION CLASS SURGE
ARRESTERS FOR 132 KV SYSTEMS (31 MM/KV)
Note: Details provided in Schedule B must be only for one item per sheet. Print and complete a new sheet for
each separate item tendered for.
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code:
2
Operating conditions:
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
2.4
Maximum ambient temperature
o
40
2.5
Maximum diurnal variation
o
Item
Description
1
2.3
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class:
E
2.8
Lightning activity
High
2.9
System earthing
Effective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
132
2.12
Maximum system voltage
kV
145
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
550
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
84
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
kV
300
4
Arrester housing:
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
86 of 172
Page:
Silicone
Polymer
xxxxxxxxx
4.1
Housing material: Item 14
4.2
Minimum external creepage distance:
4.2.1
Item 14A and 14B [Um x 31 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
mm
xxxxxxxxx
4495
xxxxxxxxx
5.6
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6
flat washers
Reference number of drawing showing mounting details
6
Arrester line terminal
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
xxxxxx
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
5.5
Yes
xxxxxx
mm
100
Earth terminal to be provided with clamping arrangement
suitable for clamping of the following conductor:
7.1
Conductor material
Copper
7.2
Conductor type
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
7.6
Reference number of drawing showing details of earth
terminal
xxxxxx
8
Drawings to be submitted with tender(Single copies
of drawings shall be submitted as part of the original
tender showing the following detail)
Strap
mm
50 x 3
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
87 of 172
Page:
8.1
Outline dimensions of arrester, fit as for service
Reference
Number:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with prior
duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters
10.1
Overall height of arrester
mm
xxxxxx
10.2
Preferred external flashover distance
mm
1100
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
xxxxxx
11
MOV elements:
11.1
Diameter of elements
mm
xxxxxx
11.2
Thickness of elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
12.2
Total mass of assembled unit
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
No
o
12.3
Minimum expected life of arrester at 40 C and MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of test
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82) x
Ures]
Kg
xxxxxx
yrs
30
Yes
kN
xxxxxx
xxxxxx
kV
476
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
88 of 172
Page:
12.8
60 s wet power frequency withstand
r.m.s kV
230
12.9
Residual voltage test (Reference number of test report
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
300
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test (Reference
number of test report)
12.13.1
Charging voltage
xxxxxx
kV
336
xxxxxxxxx
xxxxxxxxx
xxxxxx
pu of Ur
3.2
or
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after long
duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
60
Cool to
ambient
%
5
xxxxxxx
xxxxxxxxx
Conditioning part 1:
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x
MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
12.14.7
High current impulse (4/10μs)
12.14.8
Number of applications
12.15
Conditions for switching surge test:
12.15.1
Charging voltage
kA
pu of Ur
or
xxxxxxxxx
101
xxxxxxxxx
100
2
xxxxxxxxx
xxxxxxxxx
3.2
xxxxxxxxx
xxxxxxxxx
12.15.2
Charging current
A
xxxxxx
12.15.3
Virtual duration of peak
μs
2000
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
89 of 172
Page:
12.15.4
Number of discharge operations
2
12.15.5
Interval between operations
s
60
12.15.6
Starting temperature for first impulse
o
60
12.15.7
Energy dissipated during second impulse
kJ
12.16
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
xxxxxx
xxxxxxxxx
12.16.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.16.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.16.3
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.16.4
Maximum permitted change in residual voltage after long
duration current impulse withstand test
%
5
12.17
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.18
Short-circuit test (Reference number of test report)
Xxxxxx
12.18.1
High current
kA r.m.s
40
12.18.2
Low current
kA r.m.s
0.6 ± 0.2
12.19
KIPTS Natural ageing and pollution performance test
(Reference number of test report)
12.20
Internal partial discharge test (Reference number of test
report)
12.21
Power frequency voltage applied [1.05 x MCOV]
kV
89
12.22
Maximum partial discharge
pC
10
12.23
Moisture ingress test (Reference number of test report)
Xxxxxx
12.24
Bending moment test (Reference number of test report)
Xxxxxx
C
14A
Yes
14B
No
xxxxxxxxx
Xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
90 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 15: STATION CLASS SURGE ARRESTERS FOR
220 KV SYSTEMS (25 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 15
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
220
2.1.2
Maximum system voltage (Urn)
kV
242
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
825
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
Maximum ambient temperature
o
40
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
2.2.2
2.2.3
Unit
C
C
C
xxxxxx
d
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
3.1
3.1.1
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
Continuous operating voltage
kV
154
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
xxxxxx
xxxxxx
Arrester classification
xxxxxx
xxxxxx
IEC long duration class
3
kA(peak)
10
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
91 of 172
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
6050
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
1850
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
92 of 172
Page:
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
xxxxxx
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
93 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 16: STATION CLASS SURGE ARRESTERS FOR
220 KV SYSTEMS (31 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 16
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
220
2.1.2
Maximum system voltage (Urn)
kV
242
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
825
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
e
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
154
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
94 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
7502
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
1850
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
95 of 172
Page:
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
96 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
97 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 17: STATION CLASS SURGE ARRESTERS FOR
220 KV SYSTEMS (25 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 17
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
220
2.1.2
Maximum system voltage (Urn)
kV
242
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
825
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
d
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
154
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
98 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
6050
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
1850
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
99 of 172
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
3000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
100 of 172
Page:
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
101 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 18: STATION CLASS SURGE ARRESTERS FOR
220 KV SYSTEMS (31 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 18
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
220
2.1.2
Maximum system voltage (Urn)
kV
242
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
825
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
e
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
154
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
102 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
7502
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
1850
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
103 of 172
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
3000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
104 of 172
Page:
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
105 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 19: STATION CLASS SURGE ARRESTERS FOR
275 KV SYSTEMS (25 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 19
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
275
2.1.2
Maximum system voltage (Urn)
kV
300
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1050
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
Up to1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
d
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
180
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
612
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
106 of 172
3.4.1
10 kA (not greater than)
kV(peak)
560
3.4.2
20 kA (not greater than)
kV(peak)
620
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
7.2
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1050
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
850
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
7500
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
2350
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
107 of 172
Page:
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
108 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
109 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 20: STATION CLASS SURGE ARRESTERS FOR
275 KV SYSTEMS (31 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 20
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
275
2.1.2
Maximum system voltage (Urn)
kV
300
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1050
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
Up to1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
e
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
180
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
612
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
110 of 172
3.4.1
10 kA (not greater than)
kV(peak)
560
3.4.2
20 kA (not greater than)
kV(peak)
620
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
7.2
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1050
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
850
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
9300
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
2350
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
111 of 172
Page:
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
112 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
113 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 21: STATION CLASS SURGE ARRESTERS FOR
275 KV SYSTEMS (25 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 21
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
275
2.1.2
Maximum system voltage (Urn)
kV
300
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1050
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
Up to1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
d
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
180
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
612
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
114 of 172
3.4.1
10 kA (not greater than)
kV(peak)
560
3.4.2
20 kA (not greater than)
kV(peak)
620
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
7.2
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1050
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
850
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
7500
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
2350
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
115 of 172
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
3000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
116 of 172
Page:
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
117 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 22: STATION CLASS SURGE ARRESTERS FOR
275 KV SYSTEMS (31 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 22
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
275
2.1.2
Maximum system voltage (Urn)
kV
300
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1050
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
Up to1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
2.2.6
Intensity of solar radiation
Item
Description
1
Unit
C
C
C
xxxxxx
e
(Urn)
kW/m
1.1
2
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
3
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
10
Continuous operating voltage
kV
180
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
10
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
612
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
118 of 172
3.4.1
10 kA (not greater than)
kV(peak)
560
3.4.2
20 kA (not greater than)
kV(peak)
620
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
7.2
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1050
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
850
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
9300
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
2350
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
119 of 172
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
3000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
120 of 172
Page:
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
121 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 23: STATION CLASS SURGE ARRESTERS FOR
400 KV SYSTEMS (25 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 23
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
400
2.1.2
Maximum system voltage (Urn)
kV
420
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1425
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
Unit
C
C
C
xxxxxx
d
kW/m
2
2.2.6
Intensity of solar radiation
1.1
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
4
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
20
Continuous operating voltage
kV
245
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
840
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
122 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1425
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
1050
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
10500
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
3200
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
123 of 172
Page:
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
124 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
125 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 24: STATION CLASS SURGE ARRESTERS FOR
400 KV SYSTEMS (31 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 24
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
400
2.1.2
Maximum system voltage (Urn)
kV
420
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1425
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
Unit
C
C
C
xxxxxx
e
kW/m
2
2.2.6
Intensity of solar radiation
1.1
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
4
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
20
Continuous operating voltage
kV
245
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
840
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
126 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1425
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
1050
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
13020
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
3200
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
127 of 172
Page:
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
128 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
129 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 25: STATION CLASS SURGE ARRESTERS FOR
400 KV SYSTEMS (25 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 25
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
400
2.1.2
Maximum system voltage (Urn)
kV
420
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1425
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
Unit
C
C
C
xxxxxx
d
kW/m
2
2.2.6
Intensity of solar radiation
1.1
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
4
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
20
Continuous operating voltage
kV
245
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
840
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
130 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1425
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
1050
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
10500
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
3200
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
131 of 172
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
4000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
132 of 172
Page:
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
133 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 26: STATION CLASS SURGE ARRESTERS FOR
400 KV SYSTEMS (31 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 26
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
400
2.1.2
Maximum system voltage (Urn)
kV
420
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1425
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
Unit
C
C
C
xxxxxx
e
kW/m
2
2.2.6
Intensity of solar radiation
1.1
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
4
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
20
Continuous operating voltage
kV
245
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
840
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
134 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1425
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
1050
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
13020
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
3200
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
135 of 172
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
4000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
136 of 172
Page:
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
137 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 27: STATION CLASS SURGE ARRESTERS FOR
765 KV SYSTEMS (25 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 27
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
765
2.1.2
Maximum system voltage (Urn)
kV
800
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
2100
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
2.2.2
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
Unit
C
C
C
xxxxxx
d
kW/m
2
2.2.6
Intensity of solar radiation
1.1
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
5
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
kA(peak)
20
Continuous operating voltage
kV
465
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
xxxxxx
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
138 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
20125
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
5500
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
xxxxxx
3.10.2
Arrester continuous operating voltage
μV
xxxxxx
3.10.3
Arrester rated voltage
μV
xxxxxx
4
Arrester construction details
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
139 of 172
Page:
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
xxxxxx
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
Polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
140 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
141 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 28: STATION CLASS SURGE ARRESTERS FOR
765 KV SYSTEMS (31 MM/KV)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 28
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
765
2.1.2
Maximum system voltage (Urn)
kV
800
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
2100
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
Maximum ambient temperature
o
40
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
1.1
2.2.2
2.2.3
Unit
C
C
C
xxxxxx
e
kW/m
2
2.2.6
Intensity of solar radiation
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
5
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
Continuous operating voltage
kV
465
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
xxxxxx
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
kA(peak)
1.1
20
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
142 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
24955
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
5500
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
xxxxxx
3.10.2
Arrester continuous operating voltage
μV
xxxxxx
3.10.3
Arrester rated voltage
μV
xxxxxx
4
Arrester construction details
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
143 of 172
Page:
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
xxxxxx
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
144 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
145 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 29: STATION CLASS SURGE ARRESTERS FOR
765 KV SYSTEMS (25 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 29
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
765
2.1.2
Maximum system voltage (Urn)
kV
800
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
2100
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
Maximum ambient temperature
o
40
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
1.1
2.2.2
2.2.3
Unit
C
C
C
xxxxxx
d
kW/m
2
2.2.6
Intensity of solar radiation
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
5
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
Continuous operating voltage
kV
465
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
xxxxxx
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
kA(peak)
1.1
20
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
146 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
20125
3.9.2
Minimum SCD
mm/kV
25
3.9.3
External flashover distance (Preferred)
mm
5500
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
xxxxxx
3.10.2
Arrester continuous operating voltage
μV
xxxxxx
3.10.3
Arrester rated voltage
μV
xxxxxx
4
Arrester construction details
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
147 of 172
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
xxxxxx
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
4000
5.3
SSL- Bending
N
8000
5.4
SSL- Torsion
Nm
4000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
mm
Kg
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
Silicone
polymer
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
148 of 172
Page:
mm
xxxxxx
6.4
External diameter of arrester housing
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
149 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 30: STATION CLASS SURGE ARRESTERS FOR
765 KV SYSTEMS (31 MM/KV AND MECHANICAL LOAD BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 30
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
765
2.1.2
Maximum system voltage (Urn)
kV
800
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
2100
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
Maximum ambient temperature
o
40
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
1.1
2.2.2
2.2.3
Unit
C
C
C
xxxxxx
e
kW/m
2
2.2.6
Intensity of solar radiation
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
5
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
Continuous operating voltage
kV
465
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
xxxxxx
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
kA(peak)
1.1
20
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
xxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
150 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
xxxxxx
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
xxxxxx
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
24955
3.9.2
Minimum SCD
mm/kV
31
3.9.3
External flashover distance (Preferred)
mm
5500
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
xxxxxx
3.10.2
Arrester continuous operating voltage
μV
xxxxxx
3.10.3
Arrester rated voltage
μV
xxxxxx
4
Arrester construction details
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
151 of 172
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
xxxxxx
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
4000
5.3
SSL- Bending
N
8000
5.4
SSL- Torsion
Nm
4000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
mm
Kg
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
Silicone
polymer
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
152 of 172
Page:
mm
xxxxxx
6.4
External diameter of arrester housing
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
153 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 31: STATION CLASS SURGE ARRESTERS FOR
132 KV SYSTEMS (EXTREME POLLUTION ENVIRONMENT)
Schedule A: Eskom's particular requirements
Schedule B: Guarantees and technical particulars of equipment offered
Schedule A
Schedule
B
Surge arrester identification:
xxxxxxxxx
xxxxxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 31
2
Operating conditions:
xxxxxx
xxxxxxxxx
2.1
Altitude
m
1800
2.2
Average humidity
%
30 to 90
Minimum ambient temperature
o
-10
Maximum ambient temperature
o
40
Maximum diurnal variation
o
Item
Description
1
2.3
2.4
2.5
Unit
C
C
C
kW/m
xxxxxxxxx
30
2
2.6
Intensity of solar radiation
1.1
2.7
IEC 60815 Pollution class: Item 31
>E
2.8
Lightning activity
High
2.9
System earthing
Effective
2.10
System configuration
3 phase, 3
wire
2.11
Nominal system voltage (Un)
kV
132
2.12
Maximum system voltage
kV
145
2.13
Supply frequency
Hz
50
2.14
BIL of equipment to be protected
kV(peak)
3
Electrical characteristics of arrester:
550
xxxxxxxxx
3.1
Arrester classification
Station class
3.2
IEC line discharge class
2
3.3
Arrester classification
kA
10
3.4
Nominal lightning discharge current (8/20μs)
kA
10
3.5
Minimum energy absorption capability for a single high
current impulse, 100kA 4/10μs in per unit of MCOV
kJ/kV
3.4
3.6
Arrester rated voltage (Ur)
kV
xxxxxx
3.7
MCOV (Uc)
kV
84
3.8
Maximum residual voltage (Ures) at 10kA (8/20μs)
kV
300
4
Arrester housing:
xxxxxxxxx
4.1
Housing material: Item 31
Silicone
Polymer
xxxxxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
154 of 172
xxxxxxxxx
xxxxxxxxx
4.2
Minimum external creepage distance:
4.2.1
Item 31 [Um x 38 mm/kV]
4.3
Arrester housing profile designed in strict
accordance with IEC 60815 with no deviations
xxxxxxxxx
4.3.1
c
xxxxxxxxx
4.3.2
s/p
xxxxxxxxx
4.3.3
Ld/d
xxxxxxxxx
4.3.4
P1 - P2
xxxxxxxxx
4.3.5
CF
xxxxxxxxx
4.3.6
Profile Type i.e. open, flat, alternating, under-rib, etc.
List those applicable.
xxxxxxxxx
5
Arrester mounting details
xxxxxxxxx
5.1
Orientation
Vertical
5.2
Method of mounting
Tripod base
5.3
Diameter of mounting holes in base
mm
xxxxxx
5.4
PCD
mm
110 - 255
5.5
Supplied with: 3 bolts, 3 nuts, 3 tapered washers and 6
flat washers
Yes
5.6
Reference number of drawing showing mounting details
xxxxxx
6
Arrester line terminal
6.1
Type
Stem
6.2
Diameter
26
6.3
Minimum length
6.4
Orientation
Vertical
6.5
Material
xxxxxx
6.6
Reference number of drawing showing details of line
terminal
xxxxxx
7
Arrester earth terminal
xxxxxxxxx
xxxxxxxxx
Earth terminal to be provided with clamping
arrangement suitable for clamping of the following
conductor:
xxxxxxxxx
xxxxxxxxx
7.1
Conductor material
Copper
7.2
Conductor type
Strap
7.3
Conductor dimensions
7.4
Material used for clamping arrangement
xxxxxx
7.5
If dissimilar metals are used for clamping arrangement,
state types
xxxxxx
7.6
Reference number of drawing showing details of earth
terminal
xxxxxx
8
Drawings to be submitted with tender(Single copies
of drawings shall be submitted as part of the
original tender showing the following detail)
8.1
Outline dimensions of arrester, fit as for service
mm
mm
mm
5510
xxxxxxxxx
100
50 x 3
xxxxxxxxx
xxxxxxxxx
Reference
Number:
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
155 of 172
Page:
8.2
Mounting details
Reference
Number:
8.3
Line and earth terminal, conductor clamping
arrangement
Reference
Number:
8.4
Details of grading rings
9
Arrester characteristic data required
9.1
V-I characteristic curve, AC
Reference
Number:
9.2
V-I characteristic curve, DC
Reference
Number:
9.3
Temporary overvoltage withstand capability curve in per
unit of MCOV, with and without prior duty
9.4
Arrester temporary overvoltage capability, with
prior duty as defined in Appendix D, IEC 60099-4:
9.4.1
Overvoltage applied for 1 s
pu of
MCOV
xxxxxx
9.4.2
Overvoltage applied for 5 s
pu of
MCOV
xxxxxx
9.4.3
Overvoltage applied for 10 s
pu of
MCOV
xxxxxx
10
Physical dimensions of arresters
10.1
Overall height of arrester
mm
xxxxxx
10.2
Preferred external flashover distance
mm
1100
10.3
External diameter of arrester housing
mm
xxxxxx
10.4
Diameter of voltage grading rings
mm
xxxxxx
10.5
Distance of grading ring from top of arrester
mm
xxxxxx
11
MOV elements:
11.1
Diameter of elements
mm
xxxxxx
11.2
Thickness of elements
mm
xxxxxx
11.3
Number of elements per arrester
xxxxxx
11.4
Number of stacks in parallel
12
Miscellaneous:
0
xxxxxxxxx
12.1
Live spray washing (Yes/No)
No
12.2
Total mass of assembled unit
Reference
Number:
xxxxxxxxx
Reference
Number:
xxxxxxxxx
xxxxxxxxx
o
Kg
xxxxxx
yrs
30
12.3
Minimum expected life of arrester at 40 C and MCOV
12.4
Sample available for inspection
12.5
Declared specified long-term load
12.6
Insulation withstand test (Reference number of test
report)
12.7
Lightning impulse (1.2/50μs) withstand level [(1.3/0.82)
x Ures]
kV
476
12.8
60 s wet power frequency withstand
r.m.s kV
230
12.9
Residual voltage test (Reference number of test report
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
xxxxxxxxx
Yes
kN
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
156 of 172
Page:
12.10
Maximum residual voltage for a 10kA steep current
impulse (1/20μs)
12.11
Maximum residual voltage for a lightning current
impulse (8/20μs) of magnitude:
12.11.1
5 kA
kV
xxxxxx
12.11.2
10 kA
kV
300
12.11.3
20 kA
kV
xxxxxx
12.12
Maximum residual voltage for a 500 A switching current
impulse
kV
xxxxxx
12.13
Long duration current impulse withstand test (Reference
number of test report)
12.13.1
Charging voltage
kV
336
xxxxxxxxx
xxxxxxxxx
xxxxxx
pu of Ur
3.2
or
12.13.2
Charging current
A
xxxxxx
12.13.3
Virtual duration of peak
μs
2000
12.13.4
Number of discharge operations
18
12.13.5
Number of grouped operations
6
12.13.6
Operations per group
3
12.13.7
Maximum interval between operations
12.13.8
Interval between operations
12.13.9
Maximum permitted change in residual voltage after
long duration current impulse withstand test
12.14
Operating duty test (Reference number of test report)
s
60
Cool to
ambient
%
5
xxxxxxx
xxxxxxxxx
Conditioning part 1:
12.14.1
10 kA current impulse (8/20μs), energized at 1.2 x
MCOV
12.14.2
Number of discharge operations
20
12.14.3
Number of grouped operations
4
12.14.4
Operations per group
5
12.14.5
Interval between operations
s
60
12.14.6
Intervals between groups
min
30
xxxxxxxxx
kV
Conditioning part 2:
12.14.7
High current impulse (4/10μs)
12.14.8
Number of applications
12.15
Conditions for switching surge test:
12.15.1
Charging voltage
kA
pu of Ur
or
101
xxxxxxxxx
100
2
xxxxxxxxx
xxxxxxxxx
3.2
xxxxxxxxx
xxxxxxxxx
12.15.2
Charging current
A
xxxxxx
12.15.3
Virtual duration of peak
μs
2000
12.15.4
Number of discharge operations
12.15.5
Interval between operations
s
60
Starting temperature for first impulse
o
60
12.15.6
xxxxxxxxx
2
C
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
157 of 172
Page:
12.15.7
Energy dissipated during second impulse
kJ
xxxxxx
xxxxxxxxx
12.16
Conditions for power frequency test at elevated
levels as in IEC 60099-4, 7.5.2:
12.16.1
Interval between last long duration current impulse and
power frequency test
ms
100
12.16.2
Elevated rated voltage (Ur*) applied for 10 s
kV
xxxxxx
12.16.3
Elevated continuous operating voltage (Uc*) applied for
30 min
kV
xxxxxx
12.16.4
Maximum permitted change in residual voltage after
long duration current impulse withstand test
%
5
12.17
Power frequency voltage versus time characteristic
(Reference number of test report)
xxxxxx
12.18
Short-circuit test (Reference number of test report)
Xxxxxx
12.18.1
High current
kA r.m.s
40
12.18.2
Low current
kA r.m.s
0.6 ± 0.2
12.19
Natural ageing and pollution performance test
(Reference number of test report)
Xxxxxx
12.20
Internal partial discharge test (Reference number of test
report)
Xxxxxx
12.21
Power frequency voltage applied [1.05 x MCOV]
kV
89
12.22
Maximum partial discharge
pC
10
12.23
Moisture ingress test (Reference number of test report)
Xxxxxx
12.24
Bending moment test (Reference number of test report)
Xxxxxx
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
158 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 32: STATION CLASS SURGE ARRESTERS FOR
400 KV SYSTEMS (EXTREME POLLUTION ENVIRONMENT)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 32
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
400
2.1.2
Maximum system voltage (Urn)
kV
420
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1425
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
Maximum ambient temperature
o
40
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
1.1
2.2.2
2.2.3
Unit
C
C
C
xxxxxx
>E
kW/m
2
2.2.6
Intensity of solar radiation
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
4
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
Continuous operating voltage
kV
245
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
kA(peak)
1.1
20
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
840
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
159 of 172
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1425
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
1050
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
15960
3.9.2
Minimum SCD
mm/kV
38
3.9.3
External flashover distance (Preferred)
mm
3200
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
160 of 172
Page:
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
Maximum permissible horizontal force
N
xxxxxx
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
Kg
Silicone
polymer
xxxxxx
6.4
External diameter of arrester housing
mm
xxxxxx
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
mm
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
161 of 172
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
162 of 172
Page:
TECHNICAL SCHEDULE FOR ITEM 33: STATION CLASS SURGE ARRESTERS FOR
400 KV SYSTEMS (EXTREME POLLUTION ENVIRONMENT AND MECHANICAL LOAD
BEARING)
Schedule A
Schedule
B
Surge arrester identification
xxxxxx
xxxxxx
1.1
Supplier
xxxxxx
1.2
Manufacturer, physical address and name of factory
xxxxxx
1.3
Product code: Item 33
xxxxxx
2
Operating conditions
xxxxxx
xxxxxx
2.1
Electrical conditions of service
xxxxxx
xxxxxx
2.1.1
Nominal system voltage (Un)
kV
400
2.1.2
Maximum system voltage (Urn)
kV
420
2.1.3
Basic insulation level of equipment to be protected
kV
(peak)
1425
2.1.4
Frequency of supply
Hz
50
2.1.5
System earthing
Effectively
Earthed
2.2
Site conditions of service
xxxxxx
2.2.1
Altitude
m
1800
Maximum ambient temperature
o
40
2.2.3
Minimum ambient temperature
o
-10
2.2.4
Maximum diurnal variation
o
30
2.2.5
Pollution class as per IEC 60815
Item
Description
1
2.2.2
Unit
C
C
C
xxxxxx
>E
kW/m
2
2.2.6
Intensity of solar radiation
2.2.7
Live Spray washing
No
3
Electrical characteristics
xxxxxx
xxxxxx
3.1
Arrester classification
xxxxxx
xxxxxx
3.1.1
IEC long duration class
4
3.1.2
Nominal discharge current
3.2
Arrester ratings
3.2.1
Continuous operating voltage
kV
245
3.2.2
Rated voltage
kV
xxxxxx
3.2.3
Arrester power frequency reference voltage at 1 mA
resistive current
kV
xxxxxx
3.2.4
Nominal lighting discharge current
kA(peak)
20
3.2.5
High current (4/10 μs)
kA(peak)
100
3.3
Arrester steep-current impulse residual voltage with
nominal discharge current front-times of:
3.3.1
1 μs (not greater than)
kA(peak)
1.1
20
xxxxxx
xxxxxx
kV(peak)
xxxxxx
xxxxxx
840
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
163 of 172
3.4
Peak residual voltage for 8 x 20 μs current impulse of the
following magnitudes:
3.4.1
10 kA (not greater than)
kV(peak)
xxxxxx
3.4.2
20 kA (not greater than)
kV(peak)
xxxxxx
3.4.3
30 kA (not greater than)
kV(peak)
xxxxxx
3.5
Operating duty test 1
3.5.1
Arrester energy capability expressed as kilojoules per kV
rated
kJ/kVr
xxxxxx
3.5.2
Total energy absorption capability
kJ
xxxxxx
3.6
Temporary overvoltage capability expressed as p.u. of
Um assuming maximum temperature and maximum
energy absorbed just prior to application of overvoltage
3.6.1
1.20 p.u. of Um/√3
ms
xxxxxx
3.6.2
1.40 p.u. of Um/√3
ms
xxxxxx
3.6.3
1.60 p.u. of Um/√3
ms
xxxxxx
3.7
Surge arrester expected life at 40 C and maximum
continuous operating voltage, longer or equal than
yrs
30
3.8
Arrester insulation withstand with internal parts removed
(at sea level)
3.8.1
Lightning impulse (1.2/50 μs) withstand level
kV(rms)
1425
3.8.2
Switching impulse (250/2500 μs) withstand level
kV(peak)
1050
3.9
External insulation dimensions
3.9.1
Total creepage distance over external insulation (not less
than)
mm
15960
3.9.2
Minimum SCD
mm/kV
38
3.9.3
External flashover distance (Preferred)
mm
3200
3.10
Radio influence voltage (RIV) at 1 MHz measured in
accordance with NEMA publication 107, when energized
at the following power voltages
3.10.1
Maximum system voltage
μV
100
3.10.2
Arrester continuous operating voltage
μV
100
3.10.3
Arrester rated voltage
μV
4
Arrester construction details
250
xxxxxx
4.1
Number of MOV elements in series per stack
No
xxxxxx
4.2
Number of stacks in parallel
No
xxxxxx
4.3
Dimensions of MOV elements
4.3.1
Outside diameter of MOV element
mm
xxxxxx
4.3.2
Inside diameter (if applicable)
mm
xxxxxx
4.3.3
Length (thickness)
mm
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
o
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
164 of 172
xxxxxx
4.4
Pressure relief device installed according to IEC 99-4
4.4.1
High current
kA(rms)
xxxxxx
4.4.2
Low current
kA(rms)
xxxxxx
4.5
Filler medium of arrester (nitrogen, dry air etc.)
xxxxxx
4.6
Arrester mounting
xxxxxx
4.6.1
Overall height of line terminal above arrester base or
mounting bracket
4.6.2
Method of mounting - insulated or earthed
4.6.3
xxxxxx
mm
xxxxxx
Diameter of voltage grading ring (if applicable)
mm
insulated
xxxxxx
4.6.4
Distance of grading ring from top of arrester
mm
xxxxxx
4.6.5
Base insulator material type
xxxxxx
4.7
Line terminals
xxxxxx
xxxxxx
4.7.1
Line terminal with stem:
xxxxxx
xxxxxx
4.7.2
Diameter
mm
38
Minimum length
mm
125
Orientation
vertical
Other type of line terminal to be suitable for clamping of
the following conductor:
xxxxxx
Material
xxxxxx
Type
xxxxxx
Cross section dimensions
mm
xxxxxx
4.8
Earth terminal to be provided with clamp suitable for the
following conductor:
xxxxxx
4.8.1
Material
Copper
4.8.2
Type
Strap
4.8.3
Cross section dimensions
5
Mechanical characteristics
5.1
Minimum fracture moment
Nm
xxxxxx
5.2
SLL
N
4000
5.3
SSL- Bending
N
6000
5.4
SSL- Torsion
Nm
3000
5.5.
Test report confirming mechanical characteristics
Report
reference
number
6
Miscellaneous
xxxxxx
6.1
Colour of housing
xxxxxx
6.2
Type of housing (porcelain or silicone polymer)
6.3
Mass of completely assembled single pole arrester
mm
Kg
xxxxxx
50 x 3
xxxxxx
xxxxxx
xxxxxx
xxxxxx
Silicone
polymer
xxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
165 of 172
Page:
mm
xxxxxx
6.4
External diameter of arrester housing
6.5
Special arrester identification other than nameplate
xxxxxx
6.6
Number of instruction/application manuals to be supplied
2
6.7
Arrester housing profile designed in strict accordance
with IEC 60815 with no deviations
xxxxxxxxx
6.7.1
c
xxxxxxxxx
6.7.2
s/p
xxxxxxxxx
6.7.3
Ld/d
xxxxxxxxx
6.7.4
P1 - P2
xxxxxxxxx
6.7.5
CF
xxxxxxxxx
6.7.6
Profile Type i.e. open, flat, alternating, under-rib, etc. List
those applicable.
xxxxxxxxx
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
166 of 172
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
167 of 172
Annex B - - Type test report summary sheet (To be completed per item)
Item Number as per Annex A convention :
Test
1
Insulation
withstand test
on the arrester
housing
2
Residual
voltage test
4
Long duration
current impulse
withstand test
5
Operating duty
tests
6
Internal partial
discharge tests
7
Radio
interference
voltage (RIV)
test
9
Short-circuit
tests
11
Low shortcircuit current
test
12
Weather
File name of
electronic test
report submitted
Applicable
page number
Product
code used in
type test
report
Full
product
code of
item
offered
Name of test
facility and
electronic file
name of
accreditation
certificate/evidence
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Comments
Outcome
Passed/Failed
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
168 of 172
ageing test:
1000h
13
Bending test
15
Seal leakage
test
16
KIPTS test for
items 132kV
and below
XXXXXXXXXXXXX
Notes:
[1] If a type test is not submitted or not applicable to the design offered, clear justification must be provided in the comments column.
[2] Should the product naming convention used in type test report differ from that of the product offered, clear unambiguous explanation must be given
indicating how the product tested is applicable to that offered in the comments column provided.
[3] If any, remaining type tests in SANS 60099-4 not listed above, will be requested and evaluated before factory evaluation or contract award.
[4] If more than one type test is contained in a single report, page numbers must also be provided.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
169 of 172
Annex C- Summary sheet of drawings, outlines and characteristic curves (To be completed per item)
Item Number as per Annex A convention :
Detail/Drawing required
1
Overall
dimensions,
including
mounting details
with drilling plan.
2
Line conductor
and earth
conductor
clamping
arrangements.
3
Line and earth
terminal type
details and
physical
dimensions.
4
Minimum
electrical
clearances.
5
Details of special
items such as
the
disconnecting
device or
overpressure
relief device.
Electronic File
name of
drawing/sheet
Product code
used in
Drawing/Sheet
Full product
code of
item offered
Date of Issue
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Comments
Submitted
(Y/N)
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
6
Insulating base
type details and
physical
dimensions
(where
applicable).
7
Total creepage
and SCD
indicated
8
V-I
characteristics
(protective level
characteristics)
at 8/20 µs, 30/60
µs and 1/2 µs
front (steep
current)
impulses
10
Temporary
overvoltage
withstand
capability curve,
with and without
prior duty.
170 of 172
11
12
Notes:
[1] If a drawing or characteristic curve is not submitted or not applicable, clear justification must be provided in the comments column. Omission of key
inofmration may result in disqualification.
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
171 of 172
Page:
[2] Characteristic Curves submitted as part of a test report and/or data sheet are not acceptable. Curves shall be submitted as drawings that contain the
manufacturers name, logo and a unique drawing number as a minimum
[3] Should the product naming convention used in the drawing/sheet differ from that of the product offered, clear unambiguous explanation must be given
indicating how the product indicated is applicable to that offered in the comments column provided.
[4] Clear unambiguous definitions of rated voltage, reference voltage and protective level
[5] AC voltage-resistive current curves from 20°C to 180°C and Region of thermal stability information may be required before contract award or to be made
available during factory inspection
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.
Document Classification: Controlled Disclosure
SPECIFICATION FOR STATION CLASS METAL OXIDE
SURGE ARRESTERS
Unique Identifier: 240-75540566
Revision:
Page:
172 of 172
Annex D- Deviations and Declaration (To be completed per item)
Item Number as per Annex A convention :
Deviation
Comments
1
2
3
4
5
6
7
Notes:
[1] For each item, all deviations to any requirement in this specification and associated technical schedule or annex (A-C) must be listed above with clear
explanations/ justification with regards to fitness for use for the full expected life of the product.
Declaration by supplier:
With the exception of the above deviations, this specification, associated technical schedules, factory evaluation and annexes together with the requirements
contained within, will be fully complied with in the manufacture, testing, supply, provision of drawing and documents, packaging, labelling, transport and delivery of
the product being offered, amongst others. Further it is declared that all information provided has been checked and is correct.
Signature______________________________________ Date: _______________
Full Name and Designation of Authorised Representative:____________________________________________________
ESKOM COPYRIGHT PROTECTED
When downloaded from the WEB, this document is uncontrolled and the responsibility rests with the user
to ensure it is in line with the authorized version on the WEB.