oSIST prEN IEC/IEEE 60076-57-1202:2023
(Main)Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers
Power transformers - Part 57-1202: Liquid immersed phase-shifting transformers
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
Transformateurs de puissance - Partie 57-1202: Transformateurs déphaseurs immergés dans un liquide
Močnostni transformatorji - 57-1202. del: Potopljeni transformatoji s faznim zamikom
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC/IEEE 60076-57-1202:2023
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.
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oSIST prEN IEC/IEEE 60076-57-1202:2023
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
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oSIST prEN IEC/IEEE 60076-57-1202:2023
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)
2
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oSIST prEN IEC/IEEE 60076-57-1202:2023
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
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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© 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
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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 . 30
14.2 Tolerance for impedance and phase angle . 30
Annex A (informative) Check list of information to be provided with enquiry and order . 32
A.1 Rating and general data . 32
A.1.1 Normal information . 32
A.1.2 Special information . 33
A.2 Parallel operation . 34
Annex B (informative) Behaviour of a phase shifting transformer with non-symmetrical
fault currents. 35
Annex C (informative) Example specification of buck capability . 37
Annex D (informative) Additional noise measurements . 38
Annex E (informative) Calculation of phase angle under load . 40
Annex F (informative) Additional information on advance-retard switch . 44
F.1 Principle . 44
F.2 Classification within the international standardization system . 44
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F.3 Requirements according to IEC 60214-1 and IEEE Std C57.131 . 44
Bibliography . 45
Figure 1 – Example A: DS0-3/9 . 18
Figure 2 – Example B: PS0-3/9 . 18
Figure 3 – Example C: DA0-3 . 19
Figure 4 – Example D: YNyn/IIId S0-3/9 . 20
Figure 5 – Example E: YNyn+d/IIId A0-3/9 . 20
Figure 6 – Example F: YNa0yn/dIII A0-3/9 . 21
Figure 7 – Example G: V A0-2/8. 22
Figure B.1 – PST with single phase fault and surge protection . 36
Figure E.1 – Phase angle diagram for a PST under load where α > 0 and φ < 0 . 40
0 L
Figure E.2 – Phase angle diagram for a PST under load where α < 0 and φ < 0 . 40
0 L
Figure E.3 – Phase angle diagram for a PST under load where α > 0 and φ > 0 . 41
0 L
Figure E.4 – Phase angle diagram for a PST under load where α < 0 and φ > 0 . 41
0 L
Table C.1 – Required PST capability in buck operation . 37
Table D.1 – Combinations of sound level measurements needed to represent different
loading conditions . 39
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© IEC/IEEE 2017
POWER TRANSFORMERS –
Part 57-1202: Liquid immersed phase-shifting transformers
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation.
IEEE Standards documents are developed within IEEE Societies and Standards Coordinating Committees of the
IEEE Standards Association (IEEE-SA) Standards Board. IEEE develops its standards through a consensus
development process, approved by the American National Standards Institute, which brings together volunteers
representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily
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to promote fairness in the consensus development process, IEEE does not independently evaluate, test, or
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(see http://standards.ieee.org/IPR/disclaimers.html for more information).
IEC collaborates closely with IEEE in accordance with conditions determined by agreement between the two
organizations. This Dual Logo International Standard was jointly developed by the IEC and IEEE under the
terms of that agreement.
2) The formal decisions of IEC on technical matters express, as nearly as possible, an international consensus of
opinion on the relevant subjects since each technical committee has representation from all interested IEC
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and Standards Coordinating Committees has been reached, is determined by a balanced ballot of materially
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standards document is given by the IEEE Standards Association (IEEE-SA) Standards Board.
3) IEC/IEEE Publications have the form of recommendations for international use and are accepted by IEC
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IEC/IEEE Publication or any other IEC or IEEE Publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that implementation of this IEC/IEEE Publication may require use of
material covered by patent rights. By publication of this standard, no position is taken with respect to the
existence or validity of any patent rights in connection therewith. IEC or IEEE shall not be held responsible for
identifying Essential Patent Claims for which a license may be required, for conducting inquiries into the legal
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© IEC/IEEE 2017
International Standard IEC/IEEE 60076-57-1202 has been prepared by IEC technical
committee 14: Power transformers, in cooperation with the Transformers Committee of the
1
IEEE Power & Energy Society , under the IEC/IEEE Dual Logo Agreement.
This publication is published as an IEC/IEEE Dual Logo standard.
The text of this standard is based on the following IEC documents:
FDIS Report on voting
14/892/FDIS 14/902/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
International Standards are drafted in accordance with the rules given in the ISO/IEC
Directives, Part 2.
The IEC Technical Committee and IEEE Technical Committee have decided that the contents
of this publication will remain unchanged until the stability date indicated on the IEC website
under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_______________
1
A list of IEEE participants can be found at the following URL: http://standards.ieee.org/downloads/60076/60076-
57-1202-2017/60076-57-1202-2017_wg-participants.pdf
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© IEC/IEEE 2017
POWER TRANSFORMERS –
Part 57-1202: Liquid immersed phase-shifting transformers
1 Scope
This part of IEC 60076 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 IEC 60076 series or IEEE Std C57.12.00™ and IEEE Std C57.12.10™.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
2.1 IEC references
IEC 60050-421, International Electrotechnical Vocabulary – Chapter 421: Power transformers
and reactors (available at: www.electropedia.org)
IEC 60076-1, Power transformers – Part 1: General
IEC 60076-2, Power transformers – Part 2: Temperature rise for liquid-immersed transformers
IEC 60076-3, Power transformers – Part 3: Insulation levels, dielectric tests and external
clearances in air
IEC 60076-5, Power transformers – Part 5: Ability to withstand short circuit
IEC 60076-10, Power transformers – Part 10: Determination of sound levels
IEC 60076-18, Power transformers – Part 18: Measurement of frequency response
ISO 2178, Non-magnetic coatings on magnetic substrates – Measurement of coating
thickness – Magnetic method
ISO 2409, Paints and varnishes – Cross-cut test
2.2 IEEE references
IEEE Std C57.12.00™, IEEE Standard for General Requirements for Liquid-Immersed
Distribution, Power, and Regulating Transformers
IEEE Std C57.12.10™, IEEE Standard Requirements for Liquid-Immersed Power
Transformers
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© IEC/IEEE 2017
IEEE Std C57.12.70™, IEEE Standard for Standard Terminal Markings and Connections for
Distribution and Power Transformers
IEEE Std C57.12.80™, IEEE Standard Terminology for Power and Distribution Transformers
IEEE Std C57.12.90™, IEEE Standard Test Code for Liquid-Immersed Distribution, Power,
and Regulating Transformers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
For the purposes of this document, the terms and definitions given in IEC 60050-421 and
IEC 60076-1 apply to IEC specified phase shifting transformers. For IEEE specified phase
shifting transformers the terms and definitions given in IEEE Std C57.12.80 apply. For all
phase shifting transformers the following apply and take precedence.
3.1
phase-shifting transformer
PST
transformer (or combination of transformers designed to work together) with two sets of line
terminals (S and L) which is capable of varying the voltage phase-angle relationship between
the S terminals and the L terminals
Note 1 to entry: The rated voltage of the S terminals and the L terminals may be the same or different. In addition
the PST may also be capable of varying the in-phase voltage.
Note 2 to entry: This note applies to the French language only.
3.2
S terminal
terminal that is used as the fixed reference point when measuring the voltage phase angle of
a phase-shifting transformer
3.3
L terminal
terminal that is used to measure the voltage phase angle when compared to the S terminal of
the phase-shifting transformer
Note 1 to entry: The designations of S and L to the terminals do not imply any particular direction of power
...
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