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PRODUCED BY THE OPERATIONS DIRECTORATE OF ENERGY NETWORKS ASSOCIATION
www.energynetworks.org
Technical Specification 35-2
Issue 6 2014
Schedules
PUBLISHING AND COPYRIGHT INFORMATION
Issue 5 published, June, 2007.
Amendments since publication
Issue Date Amendment
Issue 6
December 2014
Major revision (see ENA TS 35-2 - Full document)
© 2014 Energy Networks Association
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Energy Networks Association. Specific enquiries concerning this document should be addressed to:
Operations DirectorateEnergy Networks Association6th Floor, Dean Bradley House
52 Horseferry RdLondon
SW1P 2AF
This document has been prepared for use by members of the Energy Networks Association to take account of the conditions which apply to them. Advice should be taken from an appropriately qualified engineer on the suitability of this document for any other purpose.
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 3
Contents
Annex A (normative) Schedule of Requirements for emergency rated system transformers.......................................................................................................................4A.1 Schedule of Requirements (to be completed by purchaser).....................................4
Annex B (normative) Self-Certification Conformance Declaration...........................................7Annex C (normative) Technical Schedules (to be completed by the manufacturer for
emergency rated system transformers)............................................................................20C.1 Manufacturers and places of manufacture, testing and inspection.........................20
Annex D (normative) Additional technical schedules (to be completed by manufacturer)...................................................................................................................22
Tables
Table B.1 — Self-Certification Conformance Declaration.........................................................8
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 4
Annex A (normative)
Schedule of Requirements for emergency rated system transformers
A.1 Schedule of Requirements (to be completed by purchaser)
Item Clause Description
1 4.2 Ambient temperature for Emergency Rating °C * 5
2 5.1.1 Rated power at Emergency Rating MVA * 15 / 24 / 30 / 40 / 50
3 5.3 Generator transformer load rejection required * Yes / No
4 5.4.1 HV rated voltage kVLV rated Voltage kV
5 5.4.2 Rated frequency Hz 50
6 6.4 Tapping range * ±8 x 1.25%+4 x 1.43% / -12 x 1.43%±16 x 0.625% / Other (specify)
7 6.4 Category of Tapping Voltage VariationWhere CbVV is selected, provide tap position for changeover between CFVV and VFVV
Tap Number
* CFVV / CbVV
8 6.5 Impedance envelope for 12/24MVAImpedance envelope for 15/30MVA
* 1 (b) / 1 (c)* 1 (d) / 1 (e)
9 6.6 Loss Capitalization Values(i) No-load Loss £/kW(ii) Load Loss at 50% CER £/kW
ORMaximum Guaranteed Losses in accordance with 6.6
(i) No-load Loss W(ii) Load Loss at 50% CER (ONAN operation) W
10 7 Vector group (add phase displacement number) * Dyn__YNyn__Yyn__
11 7 Vector links requiredIf yes, alternative vector group
* Yes / No
12 7 Stabilising windings required on star-star transformers
* Yes / No
13 9.2 Neutral conductor and terminal intended to carry load
* Yes / No
14 9.3 Liquid preservation system
If free breathing, breather type
* Free breathing /Diaphragm conservator* Desiccant / refrigerating
15 9.4 Level of d.c. currents in neutral circuits A
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 5
Item Clause Description
16 11.1.1 For equipment voltage (Um) of 12 kV r.m.sRated lightning impulse voltage (LI) kV peak * 75 / 95
17 11.1.2.1 FRA test required at works and/or on siteIf yes – specify where the test is required
* Yes / No* Works/Site/Both
18 11.1.4 Short-circuit test required * Yes / No
19 14.4.1 Separate cooler bank requiredHeight limitation mmValve & blanking plates required at alternative oil inlet
* Yes / No* 4 880 / 4 270* Yes / No
20 14.4.2 Anti-vibration mountings required (Main TX) * Yes / No
21 14.5 Auxiliary supply voltage * 400 V 3ph / 230 V 1ph
22 14.6 Maximum system short-circuit current kA
23 15.1.5 Provision for sound attenuation enclosure requiredAccess through enclosure roof permitted
* Yes / No* Yes / No
24 15.2 Finish colour required
25 15.3.1 Details of HV cable termination (if applicable)Number and size of single core cablesOil-filled disconnecting chamber requiredPosition of cable boxes
* Yes / No* Same side of tank /Manufacturer to decide
26 15.3.3 Plug-in separable connectors * Yes / No
27 15.3.4 HV terminal arrangementNVD capacitor taps requiredNVD capacitance if required pFSurge arresters requiredBrackets for surge arresters requiredCo-ordinating gaps required
* a) / b) / c) / d)* Yes / No* 60 / 90 / 140* Yes / No* Yes / No* Yes / No
28 15.3.5 HV neutral terminal arrangementAccessible isolatable link required
* a) / b) / c) / d)* Yes / No
29 15.3.6 LV terminal arrangementNumber and size of single core cables to be terminatedCable disconnecting links required
* a) / b) / c)
* Yes / No
30 15.3.7 LV neutral terminal arrangementSize of single core cable to be terminatedLV neutral current transformer(s) requiredDetails of LV neutral current transformer(s)Accessible isolatable link required
* a) / b) / c)
* Yes / No
* Yes / No
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 6
Item Clause Description
31 15.3.8 Earthing/auxiliary transformerAdditional flange required for auxiliary transformerRating kVAVector group requiredHV terminations
* Unit / Earthing / No* Yes / No / n/a
* Cable termination / Outdoor bushings
32 15.4.1 Max / min tap position indicator required * Yes / No
33 15.6.1 Type of conservator requiredLow level alarm required * Yes / No
34 15.6.2 Provision required for separate cooler bank at either end of the tank
* Yes / No
35 15.6.5 Winding temperature indicator or sensor
Output required from sensorWinding temperature indicator typeSecond WTI or sensor requiredElectronic WTI d.c. supply voltage Minimum (V)
Maximum (V)Second WTI or temperature sensor required
* Indicator / Sensor / Fibre optic* Yes / No* Dial / Electronic* Yes / No
* Yes / No
36 15.6.6 Current transformer accommodation requiredSecond voltage compounding CT required
* Yes / No* Yes / No
37 15.12 Condition monitoring equipment requiredMonitoring system typeRemote indication of WTI’s requiredProvision of top oil indicator requiredProvision for future gas in oil device requiredProvision for future fibre optic winding temperature sensor requiredGas in oil device requiredAdditional remote TPI required
* Yes / No* Current loop / Digital* Yes / No* Yes / No* Yes / No* Yes / No
* Yes / No* Yes / No
* Purchaser to delete as appropriate
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 7
Annex B (normative)
Self-Certification Conformance Declaration
ENA TS 35-2 Technical Specification for Continuous Emergency Rated (CER) system transformers (66/20.5 kV, 66/11.5 kV and 33/11.5°kV delta/star and star/star connected)
CLAUSE BY CLAUSE CONFORMANCE WITH ENA TS 35-2
Transformers covered by ENA TS 35-2 shall comply with the latest issues of the relevant International and British Standards. ENA TS 35-2 is intended to amplify and/or clarify the requirements of those Standards.
This check sheet identifies the clauses in ENA TS 35-2 and the clauses of IEC 60076-1.
The manufacturer shall declare conformance or otherwise, clause by clause, using the following levels of conformance declaration codes.
Conformance declaration codes* Instructions for completion
NA Clause is not applicable or appropriate to the product
Cs1 the product is fully conforms with the requirements of this clause
Cs2 the product partially conforms with the requirements of this clause
Cs3 the product does not conform with the requirements of this clause
Cs4 the product does not currently conform with the requirements of this clause, but the manufacturer proposes to modify and test the product in order to comply.
Manufacturer:
Product Reference:
Name: Signature: Date:
Check sheet follows…..
When Cs1 code is entered no remark is necessary
When any other code is entered the reason for non-conformance shall be entered
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 8
Table B.1 — Self-Certification Conformance Declaration
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
1 Scope N/A
2 Normative references N/A
3 Definitions N/A N/A
3.1 General N/A N/A
3.2 Terminals and neutral point N/A N/A
3.3 Windings N/A N/A
3.4 Rating N/A N/A
3.5 Tappings N/A N/A
3.6 Losses and no-load current N/A N/A
3.7 Short-circuit impedance and voltage drop
N/A N/A
3.8 Temperature rise N/A N/A
3.9 Insulation N/A N/A
3.10 Connections N/A N/A
3.11 Test classification N/A N/A
3.12 Meteorological data with respect to cooling
N/A N/A
4 Service conditions N/A N/A
4.1 General N/A
4.2 Normal service conditions Value of cooling air temp °C for CER
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 9
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
5 Rating and general requirements
5.1 Rating
5.1.1 General Emergency rated powerMVA
5.1.2 Preferred values of rated power Graph of CER vs. ambientGraph of ONAN vs. ambientGraph of CMR vs. ambientMaximum CMR MVA
5.1.3 Minimum power under alternative cooling modes
ONAN rated power MVA
5.1.4 Loading beyond rated power N/A
5.2 Cooling mode N/A
5.3 Load rejection on generator transformers
Is the transformer suitable for generator transformer load rejection?
5.4 Rated voltage and frequency N/A
5.4.1 Rated voltage HV rated voltage kVLV rated Voltage kV
5.4.2 Rated frequency Rated frequency Hz
5.4.3 Operation at higher than rated voltage and/or at other than rated frequency
N/A N/A
5.5 Provision for unusual service conditions N/A N/A
5.6 Highest voltage for equipment Um and dielectric test levels
N/A N/A
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 10
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
5.7
5.7.15.7.2
5.7.35.7.4
Additional information required for enquiryTransformer classificationWinding connection and number of phasesSound levelTransport
N/A N/A
5.8 Components and materials N/A N/A
6 Requirements for transformers having a tapped winding
N/A N/A
6.1 Notation of tapping range N/A N/A
6.2 Tapping voltage, current, etc. N/A N/A
6.3 Tapping power N/A
6.4 Specification of tappings Tapping range offered
6.5 Specification of short-circuit impedance Graph of impedance vs. tap position
6.6 Load loss and temperature rise Guaranteed load loss at 50% of CER kW
Peak Efficiency Index (PEI) %
Regulation (EU) No 548/20:Tier 1 compliance?Tier 2 compliance?If not, give reasons
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 11
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
7 Connection and phase displacement symbol
Vector groupAlternative vector group where links are providedStabilising winding provided for star-star transformer
8 Rating plates
8.1 General N/A N/A
8.2 Information to be given in all cases N/A
8.3 Additional information to be given N/A N/A
9
9.1
Safety, environmental and other requirementsSafety and environmental requirements
N/A
N/A
N/A
N/A
9.2 Dimensioning of neutral connection Is neutral connection dimensioned for load current?
9.3 Liquid preservation system Description of liquid preservation system
9.4 d.c. currents in neutral circuits
9.5 Centre of gravity marking N/A N/A
10 Tolerances N/A N/A
1111.1
11.1.1
TestsGeneral requirements for routine, type and special testsGeneral
N/AN/A
Rated lightning impulse voltage (LI) kV peak
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 12
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
11.1.2 Routine tests Guaranteed sound power level at ONAN dB(A)
11.1.2.1 Routine tests for all transformers Where are FRA tests to be carried out?
11.1.2.2 Additional routine tests for transformers with Um > 72.5 kV
N/A N/A N/A
11.1.3 Type tests Are type test results from an identical unit available?Guaranteed sound power level at CER dB(A)Power taken by the fan and liquid pump motors kWNo-loss loss and current at 90% of rated load kW, A100% of rated load kW, A110% of rated load kW, A
11.1.4 Special tests Guaranteed and expected change of impedance after short-circuit testSpecial tests included in offer
11.2 Measurement of winding resistance N/A
11.3 Measurement of winding ratio and phase displacement
N/A
11.4 Measurement of short-circuit impedance and load-loss
N/A
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 13
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
11.5 Measurement of no-load loss and current
Guaranteed no-load loss kW
11.6 Measurement of zero-phase sequence impedance (ZPSI)
Guaranteed ZPSI Ω/ph
11.7 Tests on OLTC N/A N/A
11.8 Leak testing with pressure for liquid immersed transformers
N/A
11.9 Vacuum deflection test N/A
11.10 Pressure deflection test for liquid immersed transformers
N/A N/A
11.11 Vacuum tightness on site for liquid immersed transformers
N/A N/A
11.12 Check of core and frame insulation N/A N/A
11.13 Temperature Rise at Emergency Rating N/A N/A
11.14 Determination of Sound Levels N/A N/A
11.15 Frequency Response Analysis N/A Is frequency response analysis is included in offer?
11.16 Measurement of the harmonics N/A 3rd harmonic component %
11.17 Insulation resistance measurements N/A N/A
11.18 Site tests N/A N/A
12 EMC N/A N/A
13 High frequency switching transients N/A N/A
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 14
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
1414.1
Transformer detailsNo. of phases and frequency
N/A N/A
14.2 Cooling medium N/A Cooling medium offered
14.3 Cooling N/A Cooling type at CER
14.414.4.1
Limiting dimensionsSeparate cooler bank arrangement
N/A Does the transformer meet requirements of 14.4.1?
14.4.2 Anti-vibration mountings N/A Percentage isolation value and description of AV mountings
14.5 Auxiliary supply voltage N/A Supply voltage for tap-changer and cooler
14.6 Duty under fault conditions N/A Short-circuit capability demonstrated? (supply details & test certificates)
15 Construction details N/A N/A
15.1 Tanks and covers N/A N/A
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 15
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
15.1.1 Tanks N/A Total oil required (including cooling system). litresFilling medium for transportOverall height when arranged for transport on trailer mmOverall weight when arranged for transport on trailer tonnesTotal weight as installed in service including cooler plant, all fittings and oil. tonnesType of haulage facilities offered
15.1.2 Covers N/A Is offer for bolted or welded cover?
15.1.3 Gaskets N/A Description of gasket material and thickness
15.1.4 Earthing connections N/A N/A
15.1.5 Sound attenuation enclosures N/A Is sound attenuation enclosure offered?
15.2 Surface finish N/A Finish colour offered
15.3 Terminals N/A Are separate disconnecting chambers provided?Position of HV and LV terminals
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 16
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
15.3.1 Cable boxes N/A Position of cable boxesOil-filled disconnecting chamber included?
15.3.2 Outdoor bushings N/A N/A
15.3.3 Plug-in separable connectors N/A Type of cone offered
15.3.4 HV terminals N/A Type of terminals offeredNVD capacitor taps offered?Surge arresters included?Brackets for surge arresters included?Co-ordinating gaps included?
15.3.5 HV neutral terminal N/A Type of terminal offeredAccessible isolatable link offered?
15.3.6 LV termination N/A Type of termination offeredCable disconnecting links included?
15.3.7 LV neutral termination N/A Type of termination offeredLV neutral current transformer(s) included?Accessible isolatable link included?
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 17
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
15.3.8 Earthing/auxiliary transformer N/A Earthing/auxiliary transformer type?Is flange and valve included?RatingHV terminationsOther details, if not standard
15.4 On-load tap-changer N/A N/A
15.4.1 Operating mechanism N/A Description of motor protectionIs a max/min tap position indicator included?
15.4.2 Segregation of compartments N/A N/A
15.4.3 Method of operation N/A N/A
15.5 Clearance to exposed conductors N/A N/A
15.6 Fittings N/A N/A
15.6.1 Conservator N/A Is low oil level alarm included?
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 18
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
15.6.2 Cooling plant N/A Cooling loss kWNumber of pumpsContinuous rating of pump motor shaft kWStarting current of pump motor ANumber of fansContinuous rating of fan motor shaft kWStarting current of fan motor AFan diameter mmSpeed of fans rpmProvision for separate cooler bank at either end of the tank?
15.6.3 Gas-and-oil actuated relay N/A N/A
15.6.4 Pressure relief device N/A N/A
15.6.5 Winding temperature indicators N/A Description of provision of winding temperature indicationIs a second WTI included?
15.6.6 Current transformers N/A Current transformer accommodation fitted?Second voltage compounding CT fitted?
15.6.7 Other fittings N/A N/A
15.6.8 Valves N/A N/A
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 19
Clause / Sub-clause
Requirement Conformance Code IEC 60076-1
Conformance Code ENA TS 35-2
Schedule item Remarks
15.7 Marshalling/control box N/A Means of condensation protectionDescription of security
15.8 Interconnecting cables N/A N/A
15.9 Magnetic circuit N/A N/A
15.10 Core and winding assemblies N/A N/A
15.11 Padlocks N/A N/A
15.12 Condition monitoring equipment N/A Condition monitoring equipment specified? (If so provide details)
15.13 LV switchgear and controlgear N/A N/A
16 Documentation N/A Proposed maintenance schedule
16.1 Drawings N/A Electronic drawing format
16.2 Assembly, operation and maintenance instructions
Electronic format for instruction manual
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 20
Annex C (normative)
Technical Schedules (to be completed by the manufacturer for emergency rated system transformers)
C.1 Manufacturers and places of manufacture, testing and inspection
Item Manufacturer’s Drawing Number and/or Type Designation
Manufacturer Place of Manufacture
Place of Testing and Inspection
Transformers complete
On-load tap-changer equipment
Transformer core
HV Bushings
LV Bushings
Neutral bushings
Winding conductor
Solid insulation kits
Transformer tank
Radiators
Pipe work expansion devices
Oil
Oil valves
Oil pumps
Oil pump motors
Fans
Fan motors
Dehydrating breather
Conservator diaphragm system
ENA Technical Specification 35-2 SchedulesIssue 6 2014
Page 21
Item Manufacturer’s Drawing Number and/or Type Designation
Manufacturer Place of Manufacture
Place of Testing and Inspection
Gas and oil actuated relay(s)Main tankTap-changer
Pressure relief device
Outdoor marshalling/control box
Temperature indicating devices
Material for anti-vibration mounting
Any deviation from this Schedule shall be notified in writing as soon as possible for the purchaser’s approval.
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 22
Annex D (normative)
Additional technical schedules (to be completed by manufacturer)
Item Description Details
Magnetic circuit
1 Core construction (a) Taped/banded/bolted limbs (b) Taped/banded/bolted yokes (c) Taping/banding material (as applicable)
2 Insulation of:- (a) Core bolts (b) Core bolt washers (c) Side plates (d) Core laminations
Windings
3 Types and arrangement of:- (a) HV Windings (b) LV Windings (c) Tapping windings (as applicable) (d) Winding arrangement, i.e. Core /.../...../...../
4 Conductor insulation (a) HV Windings (b) LV Windings (c) Tapping windings (as applicable)
5 Oil circulation e.g. Natural/Partially directed/Directed:- (a) To windings
(i) HV windings(ii) LV windings(iii) Tapping windings (as applicable)
(b) Through windings(i) HV windings(ii) LV windings(iii) Tapping windings (as applicable)
6 Short-circuit capabilityPotential axial thrust for worst fault condition in each winding:(i) HV windings tonnes(ii) LV windings tonnes(iii) Tapping windings (as applicable) tonnes
Coil clamping short-circuit withstand capability:
ENA Technical Specification 35-2 SchedulesIssue 6 2014
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Item Description Details
(i) HV windings tonnes (ii) LV windings tonnes (iii) Tapping windings (as applicable) tonnes
7 Current density in windings (as nominal tapping position and emergency rating): (a) HV windings A/mm2
(b) LV windings A/mm2
(c) Tapping windings A/mm2
Performance characteristics
8 No-load loss at nominal tap (excluding cooling plant loss) kW
9 Cooling plant loss kW
10 Load losses: (a) ONAN rating, 75 °C nominal tapping kW (b) CER at 115 °C extreme negative tapping kW
Tank and cooler
11 Thickness of tank: (a) Sides mm (b) Base mm (c) Cover mm
12 Thickness of radiator plates mm
13 Total oil required:(a) Tank litres(b) Cooling system litres
14 Volume of oil to be removed:To effect in-situ change of HV bushing litres
15 Total volume of conservator(s) litres
16 Total volume of conservator(s) betweenhighest and lowest visible levels litres
17 Continuous rating of oil pump motor shaft kW
18 Starting current of oil pump motor amps
19 Total number of fans
20 Nominal diameter of fans mm
21 Speed of fans rev/min
22 Continuous rating of each fan motor shaft kW
23 Starting current of each fan motor amps
General
24 Filling medium for transport
ENA Technical Specification 35-2 SchedulesIssue 6 2014Page 24
Item Description Details
25 Weights: (a) As prepared for transport tonnes (b) As installed in service including cooler plant, all
fittings and oil tonnes (c) Cooler complete with oil conservator, etc. tonnes (d) Silica gel breather charge kg
ENA Technical Specification 35-2 SchedulesIssue 6 2014
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