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Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
35-SDMS-01
DATE: 28-12-1422 H
35-SDMS-01
SPECIFICATIONS
FOR
METAL OXIDE SURGE ARRESTERS
This specification is property of SEC and
subject to change or modification without any notice
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
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35-SDMS-01
DATE: 28-12-1422 H
TABLE OF CONTENTS
CLAUSES:
PAGE NO.
1 – SCOPE
3
2 – CROSS REFERENCES
3
3 - APPLICABLE CODES AND STANDARDS
3
4 – SERVICE CONDITIONS
4
5 – SYSTEM CONDITIONS
4
6 – DESIGN AND CONSTRUCTION
5
7 – MARKING
7
8 – TESTING AND INSPECTION
8
9 – PACKING AND SHIPMENT
10
10 – GUARANTEE
10
11 – TECHNICAL DATA SCHEDULE
10
Page 2 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
1.0
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35-SDMS-01
DATE: 28-12-1422 H
SCOPE
This SEC Distribution Materials Specification describes the minimum technical
requirements for design, materials, manufacturing, testing, inspection, delivery and
performance requirement for surge arresters for 13.8KV and 33KV to be used in
the overhead distribution system of Saudi Electricity Company (SEC).
2.0
CROSS REFERENCES
This material standard specification shall be read in conjunction with the SEC
general specification No. 01-SDMS-01 (Latest Revision) for general requirements
for all equipment/materials as integral parts of this SDMS.
This SDMS shall also be read in conjunction with SEC Purchase order or contract
schedules.
3.0
APPLICABLE CODES AND STANDARDS
The latest revision of the following codes and standards shall be applicable for the
equipment/material covered in this specification. In case of any deviation, the
vendor/manufacture may propose equipment/material conforming to an alternate
code or standard. However, the provisions of SEC standard shall supersede the
provisions of these standards in case of any difference.
3.1 ANSI C62.1
Standard specification for surge arrester for AC power
circuit.
3.2 NEMA LA1
Standard specification for Surge Arresters.
3.3 IEC 60099-4
Standard specification for non-linear resistor type arrester
for A.C. system.
3.4 IEC TC37Part-3(wg-4)
Standard specification for metal oxide type arrester with
out spark gaps.
Page 3 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
3.5 IEC 168
Insulator.
3.6 ANSI 153
Galvanising.
3.7 BS 729
Galvanising.
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35-SDMS-01
DATE: 28-12-1422 H
In case of any deviation from the listed standards, it should be indicated in the list
of deviations submitted by the supplier.
4.0
SERVICE CONDITIONS
4.1 Surge arrester shall be suitable for operation under the service conditions as per
SEC latest revision of General Specification No. 01-SDMS-01.
4.2 The surge arresters and its fittings shall withstand the effect of direct solar
radiation at their installed locations. The temperature of exposed surfaces shall
be regarded as 75ºC plus the effect of internal heating.
4.3 All locations are subject to sand storms and arresters shall therefore be designed
to prevent ingress/deposit of sand over the outer and inner surface of surge
arresters.
5.0
SYSTEM CONDITIONS
The surge arresters shall be suitable for installation in a system of the given
characteristics in Table No. 1.
However for detailed system conditions refer to the latest revisions of the SEC
general specification No. 01-SDMS-01.
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Saudi Electricity Company
35-SDMS-01
DATE: 28-12-1422 H
SEC DISTRIBUTION MATERIALS SPECIFICATION
TABLE NO. 1
SYSTEM PARAMETER
Frequency
Configuration
Neutral Arrangement
Nominal Voltage
Highest System Voltage
Short Circuit Levels
Power Frequency withstand voltage
(Dry/Wet)
Creepage Distance
Nominal discharge current based on
8/20 microsecond wave form
Maximum residual voltage (KV peak
for 8/20 micro second discharge
current wave form having peak of
10KA)
SYSTEM
13.8KV
60HZ
3W
Effectively
earthed and/or
low resistance
13.8KV
15.2KV
21KA
33KV
60HZ
3W
Effectively
earthed and/or
low resistance
33KV
36KV
25KA
50/45
25/40mm/KV
80/75
25/40mm/KV
5KA
10 KA
54KV
130 KV
6.0 DESIGN AND CONSTRUCTION
6.1 This SDMS covers one type surge arrester namely Metal oxide nonlinear resistor type gapless, designed for outdoor service and shall be
housed in sealed casing to prevent ingress of moisture and dust.
6.2 Metal oxide non-linear resistor type gapless: An arrester having one
or more non-linear metal oxide resistors, connected in series and/or
parallel but having no integrated series or parallel spark gaps.
Page 5 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
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35-SDMS-01
DATE: 28-12-1422 H
6.3 Duty Class:
Surge arrester distribution classes shall be as defined in IEC 60099-4.
5KA Arrester-light duty class.
10KA Arrester-heavy duty class.
6.4 Over Pressure Relief Device:
Arrester shall be provided with a pressure relief device, a mean for
relieving internal pressure in an arrester and preventing explosive
shattering of the housing following prolonged passage of flow
current or internal flashover of the arrester.
6.5 Disconnection Feature:
Disconnector shall be incorporated. It is 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. The method of operation of disconnector shall be
described by supplier.
6.6 Insulator Detail:
All the insulator shall have the rated withstand voltage given in
Table No. 1. Creepage distance is based on nominal line-to-line
voltage and shall be 25/40mm/KV minimum for dry and wet areas
respectively. Insulator sheds shall be designed to minimize trapping
of contamination. It can either be made of polymer or porcelain
having glazed brown or gray color. The polymer should be “Silicon
rubber housing made by direct molding method”.
6.7 Moisture Sealing:
The supplier shall describe the moisture sealing system used and
shall state his own experience with the design offered. The method
of factory testing of the sealing shall be described.
It is the discretion of SEC either to accept or to ask the manufacturer
to modify the surge arrester design and construction.
Page 6 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
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35-SDMS-01
DATE: 28-12-1422 H
6.8 Mounting Arrangement:
Mounting arrangement shall be vertical or horizontal. It shall be
confirmed by the supplier. NEMA type mounting brackets shall be
provided to facilitate mounting of arresters on angle or channel iron
type cross arms.
6.9 Corrosion Protection:
All metal parts shall be hot dip galvanized in accordance with the
standard mentioned in sub-section No. 3.6 with exception to
stainless steel. In all cases the supplier shall clearly mention the
protective measure used when dissimilar metals are in contact.
6.10 Terminals:
Terminals shall be clamp type and shall be constructed for conductor
either copper or ACSR and continuous work shall be guaranteed
without any deterioration. Full details of the design of terminals
must be submitted at the time of tendering and must receive SEC
approval.
Terminals shall accommodate conductor standard sizes used by
SEC.
7.0 MARKINGS:
Each arrester shall be provided with a name plate, bearing the following
information as a minimum, in English and/or Arabic:
7.1 Rated voltage.
7.2 Nominal discharge current.
7.3 Short circuit level.
7.4 Maximum continuous operating voltage (MCOV).
7.5 Manufacturer’s name or trademark.
7.6 Year of manufacture.
7.7 Country of origin.
7.8 Manufacturer serial number.
Page 7 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
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35-SDMS-01
DATE: 28-12-1422 H
8.0 TESTING AND INSPECTION
8.1 General:
All equipments shall be tested in accordance with the latest standards
and as specified herein.
The supplier shall provide acceptable type test certificates for his
offered equipment. SEC at his discretion may wish to have
additional or repeat type test carried out. After completion of the
type tests, two certified copies of the test reports shall be submitted
for approval. No equipment shall be shipped untill approval of the
test report has been given by SEC.
Routine and/or sample test shall be carried out at the supplier’s
factory. Type tests shall be carried out at an independent laboratory
or shall be witnessed by a representative of an independent testing
laboratory or other representative acceptable to the SEC.
8.1.1 Type Tests:
All arrester shall be fully type tested in accordance with the
IEC TC 37 working group 4 proposals on surge arresters
(Section 5 & 6) and test report shall be submitted for SEC
review.
8.1.2 Routine Test:
Supplier shall provide detail of the routine tests, which will be
performed on the arresters with the minimum requirement
being following.
8.1.2.1 Leakage current test: - Measurement of the leakage
current of the arresters at voltage to 100%, 80% and
60% of the rated voltage.
8.1.2.2 Power frequency reference or low current.
8.1.2.3 Residual voltage test.
8.1.2.4 Insulator tests.
Page 8 of 12
Saudi Electricity Company
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SEC DISTRIBUTION MATERIALS SPECIFICATION
35-SDMS-01
DATE: 28-12-1422 H
8.2 Inspection:
SEC may wish to witness tests or to visit the factory during manufacture
of any or all items covered by this specification. Accordingly, the
supplier should give adequate notice of manufacturing and test
schedules.
9.0 PACKING AND SHIPMENT
9.1 Each arrester shall be unit packed, complete with line and ground
lead attachment and mounting accessories in such manner to prevent
damage to them during transportation and handling up to installation
site.
9.2 Packing shall be designed to prevent entry of dust, ingress of
moisture and other foreign matters.
9.3 Packing shall be marked with the following:
9.3.1
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
Manufacturer’s Name.
Country of Origin.
SEC Item Number.
SEC Purchase order number.
Weight in kilograms.
Handling instructions.
9.4 Supplier shall contact Material Department for additional packing,
handling and shipment instructions as applicable.
9.5 Packing note in Arabic and English shall be included in each case
giving description of goods packed.
10.0 GUARANTEE
10.1 Vendor shall guarantee the surge arresters against all the defects
arising out of faulty design, workmanship or defective material for
Page 9 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
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35-SDMS-01
DATE: 28-12-1422 H
a period of one (1) year from the date of installation or two (2)
years from the date of delivery, unless and otherwise specified in
tender documents. SEC certification for the date of installation
shall be accepted by the vendor.
10.2 If no exception/deviations are taken to this specification and no list
of deviations is submitted, it shall be deemed that, in every respect,
the offered arresters and their accessories conform to this
specification.
11.0 TECHNICAL DATA SCHEDULES
11.1 The vendor shall complete and return one copy of the attached Data
Schedule with quotation. In addition to Data Schedule, clause-byclause compliance to this Specification shall also be
confirmed/submitted.
11.2 Detailed dimensional drawing of the arrester showing mounting
arrangements, line and ground lead connections.
11.3 The supplier shall provide literature describing field experience
under similar service conditions to those given in SEC Ref. No. 4.
A reference sakes list shall be included. This shall detail the
quantities sold, name and address of users, the number of years in
service in each case. The literature shall show at least 10 years
service in each environment.
11.4 Type test certificates.
11.5 Submittals required following award of contract are given below:
a- Manufacturing schedule, progress report and test schedule.
b- Test reports.
Page 10 of 12
Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
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35-SDMS-01
DATE: 28-12-1422 H
11.0 TECHNICAL DATA SCHEDULE
METAL OXIDE SURGE ARRESTER
(sheet 1 of 2)
SR.
NO.
DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Standard to which the arrester is made
System voltage
Rated voltage
Nominal discharge current
Pressure relief class
Power frequency withstand voltage
Creepage distance
Short circuit levels
BIL
Max. continuous operating voltage (MCOV)
Maximum residual voltage, KV
Net weight, Kg
Safe cantilever strength at line terminal, KN
Insulator type
Color of glazed porcelain/polymer
No. per standard packing
Dimentional drawings and data submitted
with proposal
Method of operation of disconnector
Moisture sealing system
Mounting arrangement
21
22
Marking
Nameplate with complete information
SEC
SPECIFIED
VALUES
VENDOR
PROPOSED
VALUES
IEC 60099-4
13.8/33KV
15/36KV
5 & 10KA
Required
25/40mm/KV
21/25KA
12.7KV/29KV
Brown/Grey
Vertical or
horizontal
Required
Required
Page 11 of 12
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Saudi Electricity Company
SEC DISTRIBUTION MATERIALS SPECIFICATION
35-SDMS-01
DATE: 28-12-1422 H
11.0 TECHNICAL DATA SCHEDULE
METAL OXIDE SURGE ARRESTER
(sheet2 of 2)
SEC Inquiry No. __________________ Item No. ________________
A. Additional technical information or features specified by SEC.
B. Additional supplementary data or features proposed by vendor or/supplier.
C. Other particulars to be filled up by bidder/vendor/supplier.
D. List of the deviations and clauses to which exceptions are taken by the
bidder/vendor/supplier (Use separate sheet if necessary).
MANUFACTURER OF
MATERIALS/EQUIPMENT
VENDOR/
SUPPLIER
Name of company
Location and office
Address
Name and signature of
Authorized representative
Official Seal/Stamp
Page 12 of 12