SPECIFICATION
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Title:
Distribution
current
transformers:
specific requirements for current
transformers
manufactured
in
accordance with NRS 029, up to and
including 132kV
Reference:
Revision:
Effective date:
Total pages:
Revision date:
DSP0013
5
MARCH 2006
15
MARCH 2009
COMPILED BY
TESCOD APPROVED
FUNCTIONAL RESP APPROVED BY
AUTHORISED BY
Signed
_ _ _ _ _ _ _ _
Signed
_ _ _ _ _ _ _ _
Signed
_ _ _ _ _ _ _ _
Signed
_ _ _ _ _ _ _ _
I F SIBEKO
Engineer
B MEYER
"SC Chairperson"
A BEKKER
for TESCOD
MN BAILEY
CMDT for MD (Dx)
Content
Page
1.
Foreword....................................................................................................................2
2.
Requirements.............................................................................................................2
3.
Supporting Clauses....................................................................................................3
4.
Revisions ...................................................................................................................4
5.
Annex A Core arrangements and tapping requirements............................................6
6.
Annex B Technical schedules A and B ......................................................................14
7.
Annex C Impact assessment .....................................................................................15
JFScholtz/Mar’06 (Rev 5) to ensure traceability
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
2 of 15
and including 132kV
1.
Foreword
The HV/MV Substation Design Work Group comprising the following members prepared this
specification:
N Laubscher
H Prinsloo
B Meyer
R Maitland-Stuart
F Wahl
C Foley
J Peyper
J Jordaan
C Clark
V Naidoo
N Weber
Western Region
Northern Region
Western Region
Eastern Region
Northern Region
Northern Region
North Western Region
Northern Region
Distribution Technology
Central Region
Southern Region
The Protection Design Work Group comprising the following members
D Kehrberg
P Gerber
R Kleinhans
Central Region
Central Region
North West Region
The Metering Design Work Group represented by:
E Louw
Western Region
And the Manufacturer Interest Group represented by:
K Gilbert
J Ferreira-Netto
A Calvino
2.
Alstom
ETC
Alstom
Requirements
Distribution current transformers shall comply with the requirements of NRS 029, and Eskom’s specific
requirements as set out in annex A and schedule A of an enquiry document.
Current transformers shall be manufactured and tested in accordance with NRS 029.
The only distribution current transformers used by Eskom are in the following voltage ranges: 22 kV,
33 kV, 66 kV and 132 kV.
Corrosion protection shall be in accordance with SCSSCAAP9.
The tenderer shall complete technical schedule B of the enquiry document
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
3 of 15
and including 132kV
3.
Supporting Clauses
No section should be deleted: if not applicable, simply insert “NOT APPLICABLE”.
3.1.
Index of Supporting Clauses
Content ...................................................................................................................................... Page
3.1. Content Page........................................................................................................................... 3
3.2. Scope....................................................................................................................................... 3
3.3. Normative/Informative References.......................................................................................... 3
3.4. Definitions................................................................................................................................ 3
3.5. Abbreviations........................................................................................................................... 4
3.2.
Scope
This specification sets out the specific requirements relevant to distribution current transformers.
3.3.
Normative References
The following documents contain provisions that, through reference in the text, constitute requirements
of this specification. At the time of publication, the editions indicated were valid. All standards and
specifications are subject to revision, and parties to agreements based on this specification are
encouraged to investigate the possibility of applying the most recent editions of the documents listed
below. Information on currently valid national and international standards and specifications can be
obtained from the Information Centre and Technology Standardisation Department at Megawatt Park.
3.3.1.
Normative
IEC 60044-4:1996, Instrument transformers – Part 1: Current transformers.
IEC 60044-4:1980, Instrument transformers – Part 4: Measurement of partial discharge.
SANS 60044-6:1992, Instrument transformers – Part 6: Requirements for protective current
transformers for transient performance.
SANS 60815: Guide for selection of insulators in respect of polluted conditions.
NRS 029:2002, Current transformers for rated a.c. voltages from 3,6 kV up to and including
420kV(maximum voltage for equipment).
SCSSCAAP9: Rev 1, Corrosion protection specification for distribution equipment manufactured from
3CR12 stainless steel and mild steel (Draft).
SCSPVAC13: Rev 3, KIPTS natural ageing and pollution performance test procedure for outdoor
insulation products Section 0- General requirements.
SCSPVAC14: Rev 1, KIPTS natural ageing and pollution performance test procedure for outdoor
insulation products Section 1- Particular requirements for Post, Longrod and Stand-off insulators.
NRS 057-4:2001, Electricity metering – Part 4: Code of practice.
3.4.
Definitions
The definitions and abbreviations in NRS 029 shall apply, in addition to the following.
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
4 of 15
and including 132kV
3.5.
Abbreviations
3.5.1. MR: Multi Ratio
3.5.2.
T: Turns
3.5.3.
BZ: Bus zone
4.
Revisions
DATE
Jul’96
Jul’99
Jul’99
Feb2000
REV. NO.
0
1
2
2A
NOTES
Original issue.
Various changes
Changes made to tables 3.1, 3.2, 3.3 and 3.4 in annex A.
Changes made to schedules A and B and these are listed
below.
22 Kv CTs
1/2400 MR
1) Item1 Numbering changed.
2) Item 6a)
2500/1 MR changed to
2400/1 MR.
3) Item 19
Are electrogalvanizing, sherardizing
etc. changed to Finish.
4) Item23
Yes changed to No.
22 Kv CTs
1/1600 MR
1) Item1 Numbering changed.
2) Item 4k)
1570 (min) changed to 150
(min).
3) Item 12
Missing text added.
4) Item 19
Are electrogalvanizing, sherardizing
etc. changed to Finish.
5) Item23
Yes changed to No.
33 Kv CTs
1/1600 MR
1) Item1 Numbering changed.
2) Item 4k)
170 (min) changed to 200
(min).
3) Item 12
Missing text added.
4) Item 19
Are electrogalvanizing, sherardizing
etc. changed to Finish.
5) Item23
Yes changed to No.
66 Kv CTs
1/1600 MR
1) Item1 Numbering changed.
2) Item 4k)
325 (min) changed to 350
(min).
3) Item 20
Are electrogalvanizing, sherardizing
etc. changed to Finish.
4) Item24
Yes changed to No.
Apr’04
3(A)
Nov’04
4
132 Kv CTs
1/1600 MR
1) Item1 Numbering changed.
2) Item 20
Are electrogalvanizing, sherardizing
etc. changed to Finish.
1) Change stems to pads
2) Add KIPTS – General requirements. Document
reference number changed from SCS to DIS.
Document approved.
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
5 of 15
and including 132kV
Aug’05
4A
Feb’06
Ar’06
4A
5
1) Requirements.
2) Metering ratios on the 2400/1 to align with NRS 029.
3) Tables updated.
4) Update schedules in accordance with NRS 029.
5) Routine tests certificates to be supplied with each unit.
Comments.
Document approved.
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
6 of 15
and including 132kV
5.
5.1.
Annex A Core arrangements and tapping requirements
Core arrangements:
The core arrangements are shown in A.1.1 and A.1.2. It is important to note the primary polarity
markings with respect to the core arrangement. The six-core arrangement will be used primarily on
phase 1 and phase 2 protection schemes. It will also be used on existing stations with High Impedance
busbar protection schemes with main and check zone configuration. It will also be used where
metering dictates a requirement for a main and back-up metering core arrangement (i.e. – interregional tariff metering or bulk supply metering points)
5.1.1.
Six-core arrangement:
P1
P
CORE 1
5.1.2.
BZ
CORE 2
CORE 3
P
CORE 4
M
CORE 5
M
P2
CORE 6
Four-core arrangement:
P1
P
P
CORE 1
5.2.
BZ
M
M
CORE 2
P2
CORE 4
CORE 3
Core tapping requirements:
Core tapping for protection and metering shall be provided as specified in A.2.1 to A.2.4.
5.2.1.
Protection Multi-ratio 1/1600 T
PROTECTION: MR 1/1600T
200
S1
5.2.2.
600
S2
400
S3
400
S4
S5
Protection multi-ratio 1/2400 T
PROTECTION: MR 1/2400T
400
S1
200
S2
1000
S3
800
S4
S5
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
7 of 15
and including 132kV
5.2.3.
Metering multi-ratio 1/2400:
METERING: MR 2400/1
400
S1
5.2.4.
S2
200
S3
800
1000
S5
S4
Metering multi-ratio 1600/1:
METERING: MR 1600/1
S1
5.2.5.
400
600
200
S2
400
S5
S4
S3
Bus zone multi-ratio 1/1600:
BUS ZONE: MR 1/1600
1000
……….. S1
5.3.
200
S2
400
S3
S4
Specifications:
The specifications listed below are coupled with IEC 60044-4 and SANS 60044-6: only the relevant
output data are given below.
In the case of Class TPS CTs all specifications are given at the maximum tap and can be interpolated
linearly upwards (i.e. I magnetisation in mA).
In the case of metering CTs all specifications are given at the lowest tap and can be interpolated
upward (i.e. Rated output in VA).
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
8 of 15
and including 132kV
5.4.
Four-core, 22 kV current transformer 2400/1:
Table A.5.1
CORE
No.
1&2
3&4
TAPPING
RATIO
CLASS
S2 – S3
S1 – S2
S1 – S3
S4 – S5
S3 – S4
S2 – S4
S1 – S4
S3 – S5
S2 – S5
S1 – S5
S1 – S2
S3 – S4
S2 – S3
S1 – S3
S2 – S4
S1 – S5
1/200T
1/400T
1/600T
1/800T
1/1000T
1/1200T
1/1600T
1/1800T
1/2000T
1/2400T
400/1
800/1
1200/1
1600/1
2000/1
2400/1
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
0,2
0,2
0,2
0,2
0,2
0,2
Vknee Min
or VA
200
400
600
800
1000
1200
1600
1800
2000
2400
5VA
10VA
10VA
10VA
10VA
10VA
Imag Max
504mA
420mA
378mA
336mA
252mA
210mA
168mA
126mA
84mA
42mA
-
Rct (Ω) @
75°C
0,8
1,6
2,4
3,2
4,0
4,8
6,4
7,2
8,0
9,6
-
Notes :
Imag Max values : [mA] : Manufacturer to concur with IEC 60044
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
9 of 15
and including 132kV
5.4.1. Data table, Four-core, 33kV & 22 kV current transformer 1600/1:
Table A.5.2
CORE
No.
1&2
3&4
TAPPING
RATIO
CLASS
S1 – S2
S3 – S4
S2 – S3
S1 – S3
S2 – S4
S1 – S4
S2 – S5
S1 – S5
S1 – S2
S3 – S4
S2 – S3
S1 – S3
S2 – S4
S1 – S4
S2 – S5
S1 – S5
1/200T
1/400T
1/600T
1/800T
1/1000T
1/1200T
1/1400T
1/1600T
200/1
400/1
600/1
800/1
1000/1
1200/1
1400/1
1600/1
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
0,5
0,2
0,2
0,2
0,2
0,2
0,2
0,2
Vknee Min
or VA
200
400
600
800
1000
1200
1400
1600
5VA
10VA
10VA
10VA
10VA
10VA
10VA
10VA
Imag Max
504mA
441mA
378mA
315mA
252mA
189mA
126mA
63mA
-
Rct (Ω) @
75°C
0,8
1,6
2,4
3,2
4,0
4,8
5,6
6,4
-
Notes :
Imag Max values : [mA] : Manufacturer to concur with IEC 60044
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
10 of 15
and including 132kV
5.4.2. Buszone 1/500T fixed ratio 66kV current transformer:
Table A.5.3
CORE
No.
1&4
2&3
5&6
Imag Max
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
Vknee Min
or VA
200
400
600
800
1000
1200
1400
1600
504mA
441mA
378mA
315mA
252mA
189mA
126mA
63mA
Rct (Ω) @
75°C
0,8
1,6
2,4
3,2
4,0
4,8
5,6
6,4
1/500T
TPS
550
50mA
2,0
200/1
400/1
600/1
800/1
1000/1
1200/1
1400/1
1600/1
0,5
0,2
0,2
0,2
0,2
0,2
0,2
0,2
5VA
10VA
10VA
10VA
10VA
10VA
10VA
10VA
-
-
TAPPING
RATIO
CLASS
S1 – S2
S3 – S4
S2 – S3
S1 – S3
S2 – S4
S1 – S4
S2 – S5
S1 – S5
1/200T
1/400T
1/600T
1/800T
1/1000T
1/1200T
1/1400T
1/1600T
S1 – S2
S1 – S2
S3 – S4
S2 – S3
S1 – S3
S2 – S4
S1 – S4
S2 – S5
S1 – S5
Notes :
Imag Max values : [mA] : Manufacturer to concur with IEC 60044
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
11 of 15
and including 132kV
5.4.3. Multi-ratio Buszone 66kV current transformer:
Table A.4
Imag Max
Rct (Ω) @
Vknee Min
or VA
75°C
S1 – S2
1/200T
TPS
200
504mA
0,8
S3 – S4
1/400T
TPS
400
441mA
1,6
S2 – S3
1/600T
TPS
600
378mA
2,4
1&4
S1 – S3
1/800T
TPS
800
315mA
3,2
S2 – S4
1/1000T
TPS
1000
252mA
4,0
S1 – S4
1/1200T
TPS
1200
189mA
4,8
S2 – S5
1/1400T
TPS
1400
126mA
5,6
S1 – S5
1/1600T
TPS
1600
63mA
6,4
S1 – S2
1/1000T
TPS*
550
50mA
2
2&3
S1 – S3
1/1200T
TPS*
660
42mA
2,4
S1 – S4
1/1600T
TPS*
880
31mA
3,2
S1 – S2
200/1
0,5
5VA
S3 – S4
400/1
0,2
10VA
5&6
S2 – S3
600/1
0,2
10VA
S1 – S3
800/1
0,2
10VA
S2 – S4
1000/1
0,2
10VA
S1 – S4
1200/1
0,2
10VA
S2 – S5
1400/1
0,2
10VA
S1 – S5
1600/1
0,2
10VA
TPS* - definition of kneepoint : 10% increase of voltage, 50% increase of Imag, r.m.s. values
CORE
No.
TAPPING
RATIO
CLASS
Notes :
Imag Max values : [mA] : Manufacturer to concur with IEC 60044
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
12 of 15
and including 132kV
5.4.4. Buszone 1/500T fixed ratio 132kV current transformer:
Table A.5
CORE
No.
1&4
2&3
5&6
Imag Max
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
TPS
Vknee Min
or VA
200
400
600
800
1000
1200
1600
1800
2000
2400
504mA
420mA
378mA
336mA
252mA
210mA
168mA
126mA
84mA
42mA
Rct (Ω) @
75°C
0,8
1,6
2,4
3,2
4,0
4,8
6,4
7,2
8,0
9,6
1/500T
TPS
550
50mA
2,0
400/1
800/1
1200/1
1600/1
2000/1
2400/1
0,2
0,2
0,2
0,2
0,2
0,2
5VA
10VA
10VA
10VA
10VA
10VA
-
-
TAPPING
RATIO
CLASS
S2 – S3
S1 – S2
S1 – S3
S4 – S5
S3 – S4
S2 – S4
S1 – S4
S3 – S5
S2 – S5
S1 – S5
1/200T
1/400T
1/600T
1/800T
1/1000T
1/1200T
1/1600T
1/1800T
1/2000T
1/2400T
S1 – S2
S1 – S2
S3 – S4
S2 – S3
S1 – S3
S2 – S4
S1 – S4
Notes :
Imag Max values : [mA] : Manufacturer to concur with IEC 60044
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
13 of 15
and including 132kV
5.4.5. Buszone Multi-ratio ratio 132kV current transformer:
Table A.6
Imag Max
Rct (Ω) @
Vknee Min
or VA
75°C
S2 – S3
1/200T
TPS
200
504mA
0,8
S1 – S2
1/400T
TPS
400
420mA
1,6
S1 – S3
1/600T
TPS
600
378mA
2,4
S4 – S5
1/800T
TPS
800
336mA
3,2
1&4
S3 – S4
1/1000T
TPS
1000
252mA
4,0
S2 – S4
1/1200T
TPS
1200
210mA
4,8
S1 – S4
1/1600T
TPS
1600
168mA
6,4
S3 – S5
1/1800T
TPS
1800
126mA
7,2
S2 – S5
1/2000T
TPS
2000
84mA
8,0
S1 – S5
1/2400T
TPS
2400
42mA
9,6
S1 – S2
1/1000T
TPS*
550
50mA
2
2&3
S1 – S3
1/1200T
TPS*
660
42mA
2,4
S1 – S4
1/1600T
TPS*
880
31mA
3,2
S1 – S2
400/1
0,2
5VA
S3 – S4
800/1
0,2
10VA
5&6
S2 – S3
1200/1
0,2
10VA
S1 – S3
1600/1
0,2
10VA
S2 – S4
2000/1
0,2
10VA
S1 – S4
2400/1
0,2
10VA
TPS* - definition of kneepoint : 10% increase of voltage, 50% increase of Imag, r.m.s. values
CORE
No.
TAPPING
RATIO
CLASS
Notes :
Imag Max values : [mA] : Manufacturer to concur with IEC 60044
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
14 of 15
and including 132kV
6.
Annex B Technical schedules A and B
The schedules A and B are provided for purchasing current transformers.
The purchaser’s technical requirements are in schedule A.
Schedule B is for the suppliers to fill in with the guarantees and technical details of the offered
products.
The following list serves as an index of the schedules A and B:
Measuring core
Protection core
Bus zone core
SAP number
22 kV for use in medium pollution conditions (20
mm/kV)
Current transformer
2400/1 MR
1/2400T MR
–
0008742
22 kV for use in very heavy pollution conditions (31
mm/kV)
2400/1 MR
1/2400T MR
–
0180088
22 kV for use in medium pollution conditions (20
mm/kV)
1600/1 MR
1/1600T MR
–
0008743
22 kV for use in very heavy pollution conditions (31
mm/kV)
1600/1 MR
1/1600T MR
–
0180087
33 kV for use in medium pollution conditions (20
mm/kV)
1600/1 MR
1/1600T MR
–
0017521
33 kV for use in very heavy pollution conditions (31
mm/kV)
1600/1 MR
1/1600T MR
–
0180038
66 kV for use in medium pollution conditions (20
mm/kV)
1600/1 MR
1/1600T MR
1/1600T MR
0180036
66 kV for use in very heavy pollution conditions (31
mm/kV)
1600/1 MR
1/1600T MR
1/1600T MR
0180037
66 kV for use in medium pollution conditions (20
mm/kV)
1600/1 MR
1/1600T MR
1/500T
0017520
66 kV for use in very heavy pollution conditions (31
mm/kV)
1600/1 MR
1/1600T MR
1/500T
0180035
132 kV for use in medium pollution conditions (20
mm/kV)
2400/1 MR
1/2400T MR
1/1600T MR
0180033
132 kV for use in very heavy pollution conditions (31
mm/kV)
2400/1 MR
1/2400T MR
1/1600T MR
0180034
132 kV for use in medium pollution conditions (20
mm/kV)
2400/1 MR
1/2400T MR
1/500T
0008653
132 kV for use in very heavy pollution conditions (31
mm/kV)
2400/1 MR
1/2400T MR
1/500T
0180031
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE
Reference:
Distribution current transformers: specific
Revision:
requirements for current transformers
manufactured in accordance with NRS 029, up to Page:
DSP0013
5
15 of 15
and including 132kV
7.
Annex C
Impact assessment
Impact assessment
Document title:
Document no:
Distribution current transformer: specific
requirements
for
current
transformers
manufactured in accordance with NRS 029,
up to and including 132kV
Revision no:
DSP0013
5
Activity
Detail
What
training
is
required
to
implement
this
document?
(e.g. Awareness training, practical / on job, module.)
Who will require training? (State designations.)
What prerequisites are needed for students?
What equipment will be required for training? (Computers etc.)
What special tools will be required for training?
What special requirements are needed for the trainer?
Time period for training to be completed?
What special tools / equipment will be needed to be purchased by the Region to effectively
implement?
Are there stock numbers available for the new equipment?
Does the document affect the budget?
Time period for implementation of requirements after training is completed?
Does the Buyers Guide or Buyers List need updating?
What Buyer’s Guides have been created?
Was Training & Development consulted w.r.t training requirements?
Were the critical points in the document determined?
Is any training material available on the subject in this document?
Was the document SCSPVABE0 adhered to?
N/A
No
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Total implementation period
Total training cost
Total cost of tools / equipment
Total cost involved
Comments:
Assessment Compiled by:
Name:
Designation:
Dept:
Date:
I F Sibeko
Engineer
Plant Techn. IARC
October 2005
Recommended by (Functional Responsibility):
Name:
B Meyer
Designation:
Project Engineering Man
Dept:
Western Region
Date:
October 2005
When downloaded from the IARC Web, this document is uncontrolled and the responsibility rests with the user to ensure it is
in line with the authorised version on the Web.
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV)
Measuring core ratio: 2400/1 MR
Protection core ratio: 2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
22
b) Maximum system voltage (line-to-line) voltage (Um)
kV
24
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
2500
f) Nominal short time current (Thermal)
kA
25
g) Nominal short time current (Dynamic)
kA
64
s
3
j) Power frequency short-duration withstand voltage
kV
50 (min)
k)
kV
150 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A
Details of oil-insulated current transformers to be
submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned copper flat
pad of the following dimensions
a) Diameter holes
mm
4x14
b) size
mm
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxx
100/120/20
xxxxxxxxx
xxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Schedule B
Drawings and literature required with tender
6
xxxxxxxxx
Number of instruction books required if other than three
6
xxxxxxxxx
Number of descriptive pamphlets required if other than
three
6
xxxxxxxxx
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
4
2M
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
C.15
Subclause
4.2.2
Description
Schedule A
General purposes
Bus zone
2P
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
2400/1 MR
b) Rated burden
VA
10
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
1) Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxxx
20
2) Are core steel details required?
Yes
xxxxxxxxx
3) Is B/H curve of annealed core required?
Yes
xxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/2400T MR
2500
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
1) Are core steel details required?
2) Is B/H curve of annealed core required?
xxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxx
xxxxxxxxx
Copper
xxxxxxxxx
Flat
xxxxxxxxx
50 × 3
xxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are valid type test certificates available?
xxxxxxxxxx
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50, 1,2/50
or 1,5/50
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
For ratios for multi-ratio (MR) measuring and protection current transformers see annex A of
DSP0013.
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 2400/1 MR
Protection core ratio: 2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Humid salt air
Very heavy
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
22
b) Maximum system voltage (line-to-line) voltage (Um)
kV
24
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
2500
f) Nominal short time current (Thermal)
kA
25
g) Nominal short time current (Dynamic)
kA
64
s
3
j) Power frequency short-duration withstand voltage
kV
50 (min)
k)
kV
150 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers to be
submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned copper flat
pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if other than
three
6
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
Description
Schedule A
Schedule B
Details of CT cores
a) Number of cores
4
b) Number of measuring cores
2M
c) Number of protection cores for
General purposes
Bus zone
2P
xxxxxxxxxx
Differential
C.15
4.2.2
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
b) Rated burden
VA
c) Accuracy class
xxxxxxxx
See annex A
e) Means used to effect ratio changes if required
xxxxxxxxx
Instrument security factor at 400/1 ratio
4.2.3
10
0,2
d) Ratio for which (b) and (c) apply
C.16
2400/1 MR
20
Are core steel details required?
Yes
xxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/2400T MR
2500
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxx
xxxxxxxx
Copper
xxxxxxxx
Flat
xxxxxxxx
50 × 3
xxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
31
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50, 1,2/50
or 1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
For ratios for multi-ratio (MR) measuring and protection current transformers see annex A of
DISSCAAF4.
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
22
b) Maximum system voltage (line-to-line) voltage (Um)
kV
24
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
50 (min)
k)
kV
150 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxx
b) Manufacturer type designation
xxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
General purposes
Bus zone
4
2M
2P
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
Differential
C.15
4.2.2
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxx
xxxxxxxx
Copper
xxxxxxxx
Flat
xxxxxxxx
50 × 3
xxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A Schedule B
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
kA
l
20
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule B
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
Schedule A
5.3
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
For ratios for multi-ratio (MR) measuring and protection current transformers see annex A of
DISSCAAF4.
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Humid salt air
Very heavy
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
22
b) Maximum system voltage (line-to-line) voltage (Um)
kV
24
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
50 (min)
k)
kV
150 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
4
b) Number of measuring cores
2M
c) Number of protection cores for
General purposes
2P
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
Differential
C.15
4.2.2
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxx
xxxxxxxx
Copper
xxxxxxxx
Flat
xxxxxxxx
50 × 3
xxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
31
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50, 1,2/50
or 1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
22 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
For ratios for multi-ratio (MR) measuring and protection current transformers see annex A of
DSP0013.
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in medium pollution conditions
(20mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
33
b) Maximum system voltage (line-to-line) voltage (Um)
kV
36
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
70 (min)
k)
kV
200 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
General purposes
Bus zone
4
2M
2P
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
Differential
C.15
4.2.2
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 200/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxx
xxxxxxxx
Copper
xxxxxxxx
Flat
xxxxxxxx
50 × 3
xxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50, 1,2/50
or 1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
chnical schedules A and B
for
33 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
Humid salt
air
Very heavy
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
33
b) Maximum system voltage (line-to-line) voltage (Um)
kV
36
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
70 (min)
k)
kV
200 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
4
b) Number of measuring cores
2M
c) Number of protection cores for
General purposes
2P
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
Differential
C.15
4.2.2
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
31
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50, 1,2/50
or 1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
33 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Bus zone core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
66
b) Maximum system voltage (line-to-line) voltage (Um)
kV
72,5
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
140 (min)
k)
kV
350 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxx
b) Manufacturer type designation
xxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
4
2M
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
C.15
Subclause
4.2.2
Description
Schedule A
General purposes
Bus zone
2P
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 5 & 6
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 4
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
kA
25
l
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
Total mass of current transformer
kg
xxxxxxxxxx
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
c) Overall dimensions of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50, 1,2/50
or 1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Bus zone core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Humid salt air
Very heavy
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
66
b) Maximum system voltage (line-to-line) voltage (Um)
kV
72,5
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
140 (min)
k)
kV
350 (min)
h) Time for which thermal applies
C.4
C.5
4.1
4.1.4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
Details of insulation materials
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
4.1.4.2
Description
Schedule A
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
C6
C.7
4.1.5
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Yes
Details of oil-insulated current transformers to
be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned copper
flat pad of the following dimensions
a) Diameter holes
mm
4x14
b) size
mm
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
100/120/20
xxxxxxxxxx
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Schedule B
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other than
three
6
xxxxxxxxxx
Number of descriptive pamphlets required if other
than three
6
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
Description
Schedule A
Schedule B
Details of CT cores
a) Number of cores
4
b) Number of measuring cores
2M
c) Number of protection cores for
General purposes
Bus zone
2P
xxxxxxxxxx
Differential
C.15
4.2.2
xxxxxxxxxx
Details of measuring core
Details of core number
Core 3 & 4
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 2
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/2400T MR
2500
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A Schedule B
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
31
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Bus zone core ratio: 1/500T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
66
b) Maximum system voltage (line-to-line) voltage (Um)
kV
72,5
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
140 (min)
k)
kV
350 (min)
h) Time for which thermal applies
C.4
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item Sub-clause
C.5
Description
Schedule A Schedule B
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
C6
C.7
4.1.5
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Yes
Details of oil-insulated current transformers to
be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned copper
flat pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other than
three
6
xxxxxxxxxx
Number of descriptive pamphlets required if other
than three
6
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
Details of CT cores
4
a) Number of cores
2M
Schedule B
b) Number of measuring cores
c) Number of protection cores for
General purposes
C.15
4.2.2
2P
Bus zone
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 5 & 6
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 4
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
c) Size
Schedule A Schedule B
mm
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box table
gland plate
xxxxxxxxxx
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
50 × 3
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the terminal
box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Bus zone core ratio: 1/500T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Humid salt air
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
66
b) Maximum system voltage (line-to-line) voltage (Um)
kV
72,5
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
140 (min)
k)
kV
350 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
b) size
mm
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
100/120/20
xxxxxxxxxx
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Schedule B
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
4
b) Number of measuring cores
2M
c) Number of protection cores for
General purposes
2P
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
C.15
Subclause
4.2.2
Description
Schedule A
Bus zone
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 5 & 6
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 4
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A Schedule B
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
66 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (concluded)
Measuring core ratio: 1600/1 MR
Protection core ratio: 1/1600T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Bus zone core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
66
b) Maximum system voltage (line-to-line) voltage (Um)
kV
72,5
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
1600
f) Nominal short time current (Thermal)
kA
20
g) Nominal short time current (Dynamic)
kA
51
s
3
j) Power frequency short-duration withstand voltage
kV
140 (min)
k)
kV
350 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A
Details of oil-insulated current transformers
to be submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned
copper flat pad of the following dimensions
a) Diameter holes
mm
4x14
b) size
mm
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
100/120/20
xxxxxxxxxx
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Schedule B
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other
than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if
other than three
6
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
Schedule B
Details of CT cores
a) Number of cores
4
b) Number of measuring cores
2M
c) Number of protection cores for
General purposes
C.15
4.2.2
2P
Bus zone
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 5 & 6
a) Nominal ratio
A/A
1600/1 MR
b) Rated burden
VA
5
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 4
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance
Ri
1/1600T MR
1600
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
Schedule B
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Bus zone core ratio: 1/1600T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Inland
Medium
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
132
b) Maximum system voltage (line-to-line) voltage (Um)
kV
145
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
2500
f) Nominal short time current (Thermal)
kA
25
g) Nominal short time current (Dynamic)
kA
64
s
3
j) Power frequency short-duration withstand voltage
kV
230 (min)
k)
kV
550 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers to be
submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned copper flat
pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if other than
three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
4
2M
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
Description
Schedule A
General purposes
C.15
4.2.2
2P
Bus zone
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 5 & 6
a) Nominal ratio
A/A
2400/1 MR
b) Rated burden
VA
10
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 4
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance
Ri
1/2400T MR
2500
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
Description
Schedule A Schedule B
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box table
gland plate
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried out?
C.19
5.12
31
Characteristic of impulse wave
Results of routine tests to be included into the terminal
box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Bus zone core ratio: 1/500T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.1
1.2
Description
Schedule A
Schedule B
Service conditions
a) Altitude
m
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
Humid salt air
Very heavy
Yes
a) Access to site by
Road
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
Yes
No
m
e) Nature of ground to be traversed
f) Rise to fall
1800
300
Soft earth
m
g) Erection prepared steel support structures
3
Yes
h) Construction power supply available
Yes/No
j) Is mounting structure to be provided by the supplier?
C.3
4.1
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
kV
132
b) Maximum system voltage (line-to-line) voltage (Um)
kV
145
c) Frequency
Hz
50
xxxxxxxxxx
3
xxxxxxxxxx
d) Number of phases
e) Nominal continuous primary current
A
2500
f) Nominal short time current (Thermal)
kA
25
g) Nominal short time current (Dynamic)
kA
64
s
3
j) Power frequency short-duration withstand voltage
kV
230 (min)
k)
kV
550 (min)
h) Time for which thermal applies
C.4
C.5
4.1
Lightning impulse withstand voltage
Type of current transformers offered
a) Manufacturer of current transformer
xxxxxxxxxx
b) Manufacturer type designation
xxxxxxxxxx
4.1.4.1
Details of insulation materials
xxxxxxxxxx
4.1.4.2
Manufacturer of HV porcelain insulators
xxxxxxxxxx
Detailed drawing of insulator
Yes
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/500T MR
Item
Subclause
C6
4.1.5
C.7
4.1.6
4.1.6.5
C.8
C.10
C.11
C.12
C.13
4.1.3
4.3.5
4.3.6
4.4
Description
Schedule A Schedule B
Details of oil-insulated current transformers to be
submitted for approval
a) Expansion accommodation method
xxxxxxxxxx
b) Sealing arrangements
xxxxxxxxxx
c) Oil-level indicators
xxxxxxxxxx
Gas-insulated current transformers
Method of sealing
xxxxxxxxxx
Each main terminal to be electrotinned copper flat
pad of the following dimensions
a) Diameter holes
mm
4x14
xxxxxxxxxx
b) size
mm
100/120/20
xxxxxxxxxx
c) hole centres
mm
50x50
Holding down bolts to be arranged to fall within a
square of maximum dimensions
mm
706 × 706
xxxxxxxxxx
Diameter of the holes
mm
18
xxxxxxxxxx
Mounting arrangement
Finish
Finish offered on ferrous parts
xxxxxxxxxx
Finish offered on non-ferrous parts
xxxxxxxxxx
Rating and diagram plates
4.4.1
a) Materials used for rating plates
xxxxxxxxxx
4.4.5
b) Material used for diagram plates
xxxxxxxxxx
4.4.5
c) Method of fixing diagram and rating plates
xxxxxxxxxx
4.5
Drawings and literature required with tender
6
xxxxxxxxxx
Number of instruction books required if other than three
6
xxxxxxxxxx
Number of descriptive pamphlets required if other than
three
6
xxxxxxxxxx
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
4
2M
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/500T MR
Item
Subclause
Description
Schedule A
General purposes
C.15
4.2.2
2P
Bus zone
xxxxxxxxxx
Differential
xxxxxxxxxx
Details of measuring core
Details of core number
Core 5 & 6
a) Nominal ratio
A/A
2400/1 MR
b) Rated burden
VA
10
c) Accuracy class
0,2
d) Ratio for which (b) and (c) apply
See annex A
e) Means used to effect ratio changes if required
Xxxxxxxxxx
Instrument security factor at 400/1 ratio
C.16
4.2.3
Schedule B
xxxxxxxxxx
20
Are core steel details required?
Yes
xxxxxxxxxx
Is B/H curve of annealed core required?
Yes
xxxxxxxxxx
Details of protection core
a) Details core number
b) Nominal turns ratio
c) Continuous current rating
1) Primary
2) Secondary
Core 1 & 4
Turns
A
A
d) Accuracy class
e) Rated knee-point voltage Vk
f) Magnetising current
j) Maximum total secondary winding resistance Ri
1/2400T MR
2500
2
TPS
V
See annex A
mA
Ω
See annex A
See annex A
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
xxxxxxxxxx
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
xxxxxxxxxx
Flat
xxxxxxxxxx
50 × 3
xxxxxxxxxx
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution conditions
(20mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
Description
Schedule A Schedule B
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
Tests
Are type test results available?
xxxxxxxxxx
Yes/No
If No, are type tests to be carried out?
Yes
xxxxxxxxxx
xxxxxxxxxx
If required where are the type tests to be carried
out?
C.19
5.12
20
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in medium pollution
conditions (20mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No
For ratios for multi-ratio (MR) measuring protection and bus zone current transformers see annex A of
DSP0013.
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 1
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name: ……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Bus zone core ratio: 1/500T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item SubDescription
clause
1.2
C.1
Service conditions
a) Altitude
b) Climate conditions
c) Level of pollution that equipment will be subjected to
d) Lightning area
When erection is required
a) Access to site by
b) To be off-loaded from transport by supplier?
c) Crane available for off-loading?
d) Distance from off-loading point to operation position
e) Nature of ground to be traversed
f) Rise to fall
g) Erection prepared steel support structures
h) Construction power supply available
j) Is mounting structure to be provided by the supplier?
4.1
C.3
General requirements
a) Nominal system voltage (line-to-line) voltage (Un)
b) Maximum system voltage (line-to-line) voltage (Um)
c) Frequency
d) Number of phases
e) Nominal continuous primary current
f) Nominal short time current (Thermal)
g) Nominal short time current (Dynamic)
h) Time for which thermal applies
j) Power frequency short-duration withstand voltage
k) Lightning impulse withstand voltage
4.1
Type of current transformers offered
C.4
C.5
4.1.4.1
4.1.4.2
a) Manufacturer of current transformer
b) Manufacturer type designation
Details of insulation materials
Manufacturer of HV porcelain insulators
Detailed drawing of insulator
Schedule A
m
m
m
kV
kV
Hz
A
kA
kA
s
kV
kV
Schedule B
1800
Humid salt air
Medium
Yes
Road
Yes
No
300
Soft earth
3
Yes
Yes/No
66
72,5
50
3
1600
20
51
3
140 (min)
350 (min)
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
Yes
xxxxxxxxxx
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 2
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
C6
C.7
C.8
C.10
C.11
C.12
C.13
Subclause
4.1.5
4.1.6
4.1.6.5
4.1.3
4.3.5
4.3.6
4.4
4.4.1
4.4.5
4.4.5
4.5
Description
Details of oil-insulated current transformers to be
submitted for approval
a) Expansion accommodation method
b) Sealing arrangements
c) Oil-level indicators
Gas-insulated current transformers
Method of sealing
Each main terminal to be electrotinned copper flat
pad of the following dimensions
a) Diameter holes
b) size
c) hole centres
Mounting arrangement
Holding down bolts to be arranged to fall within a
square of maximum dimensions
Diameter of the holes
Finish
Finish offered on ferrous parts
Finish offered on non-ferrous parts
Rating and diagram plates
a) Materials used for rating plates
b) Material used for diagram plates
c) Method of fixing diagram and rating plates
Drawings and literature required with tender
Number of instruction books required if other than three
Number of descriptive pamphlets required if other than
three
Details of CT cores
a) Number of cores
b) Number of measuring cores
c) Number of protection cores for
Schedule A
Schedule B
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
mm
mm
mm
4x14
100/120/20
50x50
xxxxxxxxxx
xxxxxxxxxx
mm
mm
706 × 706
18
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
6
6
6
4
2M
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 3
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (continued)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Schedule A: Purchaser’s specific requirements
Schedule B: Guarantees and technical particulars of equipment offered
Item
SubDescription
clause
General purposes
Bus zone
Differential
4.2.2
C.15
Details of measuring core
Details of core number
a) Nominal ratio
A/A
b) Rated burden
VA
c) Accuracy class
d) Ratio for which (b) and (c) apply
e) Means used to effect ratio changes if required
Instrument security factor at 400/1 ratio
Are core steel details required?
Is B/H curve of annealed core required?
4.2.3
C.16
Details of protection core
a) Details core number
b) Nominal turns ratio
Turns
c) Continuous current rating
1) Primary
A
2) Secondary
A
d) Accuracy class
e) Rated knee-point voltage Vk
V
f) Magnetising current
mA
j) Maximum total secondary winding resistance Ri
Ω
k) Drawing number of magnetisation curve
Are core steel details required?
Is B/H curve of annealed core required?
Earth terminal to be provided with a clamp
suitable for
a) Material
b) Type
c) Size
mm
Schedule A
Schedule B
2P
xxxxxxxxxx
xxxxxxxxxx
Core 5 & 6
1600/1 MR
5
0,2
See annex A
Xxxxxxxxxx
20
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
Core 1 & 4
1/1600T MR
1600
2
TPS
See annex A
See annex A
See annex A
xxxxxxxxxx
Yes
Yes
xxxxxxxxxx
xxxxxxxxxx
Copper
Flat
50 × 3
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
xxxxxxxxxx
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 4
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
Description
Schedule A Schedule B
xxxxxxxxxx
Manufacturer of HV porcelain insulators
Rated short-duration primary current Ith
Miscellaneous
a) Oil quantity
b) Minimum effective gland area of terminal box
table gland plate
kA
l
25
xxxxxxxxxx
mm
130 × 75
Height
mm
xxxxxxxxxx
Length
mm
xxxxxxxxxx
Width
Mm
xxxxxxxxxx
kg
xxxxxxxxxx
c) Overall dimensions of current transformer
Total mass of current transformer
d) Type of terminal box
Creepage distance
Minimum Creepage distance for other than medium
pollution level (heavy) / very heavy (IEC 60815)
C.18
5.1.1
xxxxxxxxxx
mm/kV
31
Tests
Results of routine tests to be included into the
terminal box (water proof packaging)
C.19
5.12
Characteristic of impulse wave
Results of routine tests to be included into the
terminal box (water proof packaging)
µs
1/50,
1,2/50 or
1,5/50
ESKOM DISTRIBUTION GROUP
Specification reference number: DSP0013
Page 5
Enquiry No.:
………………………………… Tenderer’s name: ………………………………….
Project Name:
……………………………………………………… Date: ……………………..
Technical schedules A and B
for
132 kV distribution current transformers for use in very heavy pollution
conditions (31mm/kV) (concluded)
Measuring core ratio: 2400/1 MR
Protection core ratio: 1/2400T MR
Item
Subclause
C.20
C.21
Description
Schedule A
Schedule B
At the lowest
tap
See annex A
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Are tangent delta measurements to be made?
Yes
xxxxxxxxxx
Are special tests required?
No
xxxxxxxxxx
xxxxxxxxxx
Yes/No
Yes
xxxxxxxxxx
High voltage power frequency withstand tests
5.1.5
Minimum 60 s power-frequency wet withstand
kV
Minimum 60 s power-frequency dry withstand
kV
Short-time current test
a) short-time withstand current
A
b) time
s
C.22
5.2.6.1
Ratio for accuracy test
C.23
5.2.7.2
Are details of procedure for determination of
the rate of gas leakage submitted for approval?
C.24
5.3
Are valid type test certificates available?
If No, are type tests to be performed?
If required where are the type tests to be carried
out?
xxxxxxxxxx
5.3.1
Impulse test
Yes/No
5.3.2
Mechanical strength and sealing test
Yes/No
5.3.3
Dielectric dissipation factor test
Yes/No
5.3.4
Long duration voltage test
Yes/No
5.3.5
Chopped impulse test
Yes/No
5.3.6
Internal arc withstand capability test
Yes/No