prEN IEC/IEEE 60076-57-1202:2023

SLOVENSKI STANDARD
01-september-2023
Močnostni transformatorji - 57-1202. del: Potopljeni transformatoji s faznim
zamikom
Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers
Leistungstransformatoren - Teil 57-1202: Ölgefüllte Phasenschieber
Transformateurs de puissance - Partie 57-1202: Transformateurs déphaseurs immergés
dans un liquide
Ta slovenski standard je istoveten z: prEN IEC/IEEE 60076-57-1202:2023
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN IEC/IEEE 60076-57- en
1202:2023
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN IEC/IEEE 60076-57-1202
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2023
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 draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2023-09-22.

The text of this draft consists of the text of IEC/IEEE 60076-57-1202:2017 (14/892/FDIS).

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 76246 Ref. No. prEN IEC/IEEE 60076-57-1202:2023 E

FprEN IEC 60335-2-40:2020 (E)
European foreword
This document (prEN IEC/IEEE 60076-57-1202:2023) consists of the text of document
IEC/IEEE 60076-57-1202:2017, prepared by IEC/TC 14 "Power Transformers".
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this document (doa) dor + 6 months
has to be announced at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be withdrawn (to be confirmed or
modified when voting)
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 .
...