SIST EN IEC/IEEE 60076-57-1202:2025

Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers (IEC/IEEE 60076-57-1202:2017)

This standard covers the requirements for phase-shifting transformers of all types.
The scope excludes transformers with an unregulated phase shift.
This document is limited to matters particular to phase-shifting transformers and does not
include matters relating to general requirements for power transformers covered in existing
standards in the EN 60076 series.

Leistungstransformatoren - Teil 57-1202: Ölgefüllte Phasenschieber (IEC/IEEE 60076-57-1202:2017)

Transformateurs de puissance - Partie 57-1202: Transformateurs déphaseurs immergés dans un liquide (IEC/IEEE 60076-57-1202:2017)

Močnostni transformatorji - 57-1202. del: Transformatorji s prečnim premikom faze, potopljeni v tekočino (IEC/IEEE 60076-57-1202:2017)

General Information

• Status: Published
• Public Enquiry End Date: 21-Sep-2023
• Publication Date: 13-May-2025
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: ETR - Power transformers
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-May-2025
• Due Date: 13-Jul-2025
• Completion Date: 14-May-2025
• Ref Project: EN IEC/IEEE 60076-57-1202:2025 - Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers

Relations

• Amended By: SIST EN IEC/IEEE 60076-57-1202:2025/A11:2025 - Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers
• Effective Date: 01-Jun-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2025
Močnostni transformatorji - 57-1202. del: Transformatorji s prečnim premikom
faze, potopljeni v tekočino (IEC/IEEE 60076-57-1202:2017)
Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers
(IEC/IEEE 60076-57-1202:2017)
Leistungstransformatoren - Teil 57-1202: Ölgefüllte Phasenschieber (IEC/IEEE 60076-57
-1202:2017)
Transformateurs de puissance - Partie 57-1202: Transformateurs déphaseurs immergés
dans un liquide (IEC/IEEE 60076-57-1202:2017)
Ta slovenski standard je istoveten z: EN IEC/IEEE 60076-57-1202:2025
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC/IEEE 60076-57-1202

NORME EUROPÉENNE
EUROPÄISCHE NORM April 2025
ICS 29.180
English Version
Power transformers - Part 57-1202: Liquid immersed phase-
shifting transformers
(IEC/IEEE 60076-57-1202:2017)
Transformateurs de puissance - Partie 57-1202: Leistungstransformatoren - Teil 57-1202: Ölgefüllte
Transformateurs déphaseurs immergés dans un liquide Phasenschieber
(IEC/IEEE 60076-57-1202:2017) (IEC/IEEE 60076-57-1202:2017)
This European Standard was approved by CENELEC on 2025-03-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC/IEEE 60076-57-1202:2025 E

European foreword
This document (EN IEC/IEEE 60076-57-1202:2025) consists of the text of document
IEC/IEEE 60076-57-1202:2017, prepared by IEC/TC 14 "Power Transformers".
The following dates are fixed:
• latest date by which this document has to be (dop) 2026-04-30
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2028-04-30
conflicting with this document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC/IEEE 60076-57-1202:2017 was approved by CENELEC as a
European Standard without any modification.

IEC/IEEE 60076-57-1202 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Power transformers –
Part 57-1202: Liquid immersed phase-shifting transformers

Transformateurs de puissance –

Partie 57-1202: Transformateurs déphaseurs immergés dans un liquide

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-4258-2

– 2 – IEC/IEEE 60076-57-1202:2017
© IEC/IEEE 2017
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
2.1 IEC references . 7
2.2 IEEE references . 7
3 Terms and definitions . 8
4 Use of normative references . 11
5 Service conditions . 11
5.1 General . 11
5.2 Usual service conditions . 11
5.2.1 Switching arrangement . 11
5.2.2 Power flow . 11
5.2.3 Operation with two or more PSTs in series or parallel . 11
5.2.4 Phase unbalance . 12
5.2.5 Surge protection . 12
6 Rating and general requirements . 12
6.1 Rated power . 12
6.2 Loading at other than rated conditions . 12
6.3 Specification of buck capability . 12
6.4 Cooling modes . 13
6.5 Short circuit impedance and load phase angle capability . 13
6.5.1 Specification . 13
6.5.2 Short circuit impedance for asymmetric designs . 13
6.6 Neutral earthing (grounding) . 13
6.7 Rated voltage . 13
6.8 Voltage variation and asymmetric design . 13
6.9 Rated frequency . 14
6.10 Operation at higher than rated voltage and/or at other than rated frequency . 14
6.11 Highest voltage for equipment and dielectric test levels . 14
6.12 Taps . 14
6.13 Sound level . 14
6.14 Transport . 14
7 Construction . 14
7.1 General . 14
7.2 Liquid-filled connections between tanks . 15
7.3 Liquid insulation and preservation system . 15
7.4 Alignment between tanks . 15
7.5 Core and core frame earthing arrangements . 16
7.6 Test connections . 16
8 Short circuit capability . 16
9 Connection phase displacement symbols . 16
9.1 General . 16
9.2 Special symbols for PSTs . 16
9.3 Clock number notation . 17
9.4 Examples . 17
9.4.1 Single core phase shifting transformers . 17

IEC/IEEE 60076-57-1202:2017 – 3 –
© IEC/IEEE 2017
9.4.2 Two core phase shifting transformers . 19
9.4.3 Transformers incorporating a phase shifting element . 21
10 Rating plates (nameplates) . 22
11 Terminal markings and phase rotation . 23
12 Information to be provided by the manufacturer . 23
13 Tests . 24
13.1 General . 24
13.2 Routine tests. 24
13.3 Type (design) tests . 24
13.4 Special tests . 24
13.5 Winding resistance. 25
13.6 Measurement of voltage ratio, phase angle and check of phase
displacement . 25
13.7 Measurement of short-circuit impedance and load loss . 25
13.8 Temperature-rise test . 26
13.9 Measurement of no-load loss and current . 26
13.10 Determination of sound level . 26
13.10.1 General . 26
13.10.2 For PSTs with one combined cooling system . 26
13.10.3 For PSTs with separate exciting and series unit cooling systems . 27
13.11 Measurement of zero sequence impedance . 27
13.12 Dielectric tests . 27
13.12.1 General . 27
13.12.2 Induced voltage test with partial discharge measurement (IVPD) . 28
13.12.3 Switching impulse test (SI) . 28
13.12.4 Lightning impulse test . 28
13.12.5 Lightning impulses applied to multiple line terminals simultaneously
(LIMT) . 29
13.13 Tests on on-load tap-changers – operation test . 29
13.14 Leak testing with pressure . 30
13.15 Vacuum deflection test . 30
13.16 Pressure deflection test . 30
14 Tolerances . 30
14.1 General .
...