SIST EN 60076-13:2007

Power transformers -- Part 13: Self-protected liquid-filled transformers

This part of IEC 60076 applies to high-voltage/low-voltage self-protected liquid-filled and naturally cooled transformers for rated power 50 kVA to 1 000 kVA for indoor or outdoor use having a - primary winding (high-voltage) with highest voltage for equipment up to 24 kV; - secondary winding (low-voltage) with highest voltage for equipment of 1,1 kV. These transformers are equipped with a self-protection and disconnection device to protect the environment, property and people and prevent any disturbance of the high-voltage network from the consequences of an internal transformer fault. Transformers covered by this standard comply with the relevant requirements prescribed in the IEC 60076 series. The self-protected transformer may be used in conjunction with other devices to provide system coordination and sensitive system protection. The protection system is not designed to be functional when the power supply is from the low-voltage side. The self-protected transformer is not intended to function in parallel with another transformer.

Leistungstransformatoren - Teil 13: Selbstgeschützte flüssigkeitsgefüllte Transformatoren

Transformateurs de puissance -- Partie 13: Transformateurs auto-protégés immergés dans un liquide diélectrique

S'applique aux transformateurs haute tension/basse tension auto-protégés, immergés dans un liquide diélectrique et à refroidissement naturel, d'une puissance assignée de 50 kVA à 1 000 kVA, destinés à une installation intérieure ou extérieure, ayant un enroulement primaire (haute tension) dont la tension la plus élevée pour le matériel ne dépasse pas 24 kV; un enroulement secondaire (basse tension) dont la tension la plus élevée pour le matériel ne dépasse pas 1,1 kV.

Močnostni transformatorji - 13. del: Samozaščitni, s tekočino polnjeni transformatorji (IEC 60076-13:2006)

General Information

• Status: Published
• Publication Date: 31-Dec-2006
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: ETR - Power transformers
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2007
• Due Date: 01-Jan-2007
• Completion Date: 01-Jan-2007
• Ref Project: EN 60076-13:2006 - Power transformers - Part 13: Self-protected liquid-filled transformers

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EUROPEAN STANDARD
EN 60076-13

NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM

ICS 29.180


English version


Power transformers
Part 13: Self-protected liquid-filled transformers
(IEC 60076-13:2006)


Transformateurs de puissance  Leistungstransformatoren
Partie 13: Transformateurs auto-protégés Teil 13: Selbstgeschützte
immergés dans un liquide diélectrique flüssigkeitsgefüllte Transformatoren
(CEI 60076-13:2006) (IEC 60076-13:2006)




This European Standard was approved by CENELEC on 2006-09-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60076-13:2006 E

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EN 60076-13:2006 - 2 -
Foreword
The text of document 14/530/FDIS, future edition 1 of IEC 60076-13, prepared by IEC TC 14, Power
transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60076-13 on 2006-09-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60076-13:2006 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 60076-13:2006
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60076-1 (mod) 1993 Power transformers EN 60076-1 1997
 Part 1: General A11 1997
A1 1999 A1 2000
A12 2002


1) 2)
IEC 60076-2 (mod) - Power transformers EN 60076-2 1997
  Part 2: Temperature rise


IEC 60076-3 2000 Power transformers
+ corr. December 2000 Part 3: Insulation levels, dielectric tests and EN 60076-3 2001
external clearances in air


3)
IEC 60076-5 2000 Power transformers EN 60076-5 2000
Part 5: Ability to withstand short circuit


1)
IEC 60076-7 - Power transformers - -
Part 7: Loading guide for oil-immersed power
transformers


1) 2)
IEC 60137 - Insulated bushings for alternating voltages EN 60137 2003
above 1 000 V


1) 2)
IEC 60270 - High-voltage test techniques - Partial EN 60270 2001
  discharge measurements


1) 2)
IEC 60282-1 - High-voltage fuses EN 60282-1 2006
Part 1: Current-limiting fuses


1) 2)
IEC 60296 - Fluids for electrotechnical applications - EN 60296 2004
Unused mineral insulating oils for + corr. September 2004
transformers and switchgear


1) 2)
IEC 60836 - Specifications for unused silicone insulating EN 60836 2005
liquids for electrotechnical purposes


1) 2)
IEC 61099 - Specification for unused synthetic organic EN 61099 1992
esters for electrical purposes




1)
Undated reference.
2)
Valid edition at date of issue.
3)
EN 60076-5 is superseded by EN 60076-5:2006, which is based on IEC 60076-5:2006.

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NORME CEI
INTERNATIONALE
IEC



60076-13
INTERNATIONAL


Première édition
STANDARD

First edition

2006-05


Transformateurs de puissance –
Partie 13:
Transformateurs auto-protégés
immergés dans un liquide diélectrique

Power transformers –
Part 13:
Self-protected liquid-filled transformers

 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
CODE PRIX
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PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

---------------------- Page: 5 ----------------------

60076-13  IEC:2006 – 3 –
CONTENTS
FOREWORD.5

1 Scope.9
2 Normative references .9
3 Terms and definitions .11
4 Service conditions .11
5 Electrical characteristics.11
5.1 Rated power.11
5.2 Highest voltage for equipment .11
5.3 Windings .13
5.4 Tappings .13
5.5 Connection group .13
5.6 Dimensioning of the low-voltage winding neutral connection.13
5.7 Short-circuit impedance.13
5.8 Insulation levels and dielectric tests .13
5.9 Temperature rise limits at rated power .15
5.10 Overload capability.15
6 Self-protection and disconnection device (SPDD) .15
6.1 Functional requirements .15
6.2 Coordination principle.15
6.3 Mechanical requirements.17
7 Constructional requirements .17
7.1 Liquid preservation system.17
7.2 Bushings .17
7.3 Dielectric liquid and component materials.17
7.4 Disconnection function .17
8 Information to be supplied by the customer .17
9 Information to be supplied by the manufacturer .19
10 Rating plate.19
11 Tests .19
11.1 List and classification of tests (routine, type and special tests) .19
11.2 Routine tests .19
11.3 Type tests .19
11.4 Short-circuit test with the self-protection and disconnection device
disconnected or bypassed .21
12 Test procedure .23
12.1 Measurement of partial discharges .23
12.2 Transformer pressure test .23
12.3 Switching cycle tests .25
12.4 Behaviour test of self-protection and disconnection device .25

Figure 1 – Partial discharge measurement cycle .23

Table 1 – Order for tests carried out on prototypes A, B, C, D, E .21

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60076-13  IEC:2006 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

POWER TRANSFORMERS –

Part 13: Self-protected liquid-filled 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. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements 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 National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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 some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60076-13 has been prepared by IEC technical committee 14:
Power transformers.
The text of this standard is based on the following documents:
FDIS Report on voting
14/530/FDIS 14/536/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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60076-13  IEC:2006 – 7 –
IEC 60076 consists of the following parts, under the general title Power transformers:
Part 1: General
Part 2: Temperature rise
Part 3: Insulation levels, dielectric tests and external clearances in air
Part 4: Guide to the lightning impulse and switching impulse testing – Power transformers
and reactors
Part 5: Ability to withstand short circuit
1
Part 6: Reactors
Part 7: Loading guide for oil-immersed power transformers
Part 8: Application guide
Part 10: Determination of sound levels
Part 10-1: Determination of sound levels – Application guide
Part 11: Dry-type transformers
1
Part 12: Loading guide for dry-type power transformers
Part 13: Self-protected liquid-filled transformers
Part 14: Design and application of liquid-immersed power transformers using high-
temperature insulation materials
1
Part 15: Gas-filled-type power tranformers
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site 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
Under consideration.

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60076-13  IEC:2006 – 9 –
POWER TRANSFORMERS –

Part 13: Self-protected liquid-filled transformers



1 Scope
This part of IEC 60076 applies to high-voltage/low-voltage self-protected liquid-filled and
naturally cooled transformers for rated power 50 kVA to 1 000 kVA for indoor or outdoor use
having a
– primary winding (high-voltage) with highest voltage for equipment up to 24 kV;
– secondary winding (low-voltage) with highest voltage for equipment of 1,1 kV.
These transformers are equipped with a self-protection and disconnection device to protect
the environment, property and people and prevent any disturbance of the high-voltage
network from the consequences of an internal transformer fault.
Transformers covered by this standard comply with the relevant requirements prescribed in
the IEC 60076 series.
The self-protected transformer may be used in conjunction with other devices to provide
system coordination and sensitive system protection. The protection system is not designed
to be functional when the power supply is from the low-voltage side. The self-protected
transformer is not intended to function in parallel with another transformer.
NOTE This standard may be applied to transformers with a higher voltage than 24 kV or other rated power by
agreement between the manufacturer and the purchaser. Validation tests should be carried out at the appropriate
level.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60076-1:1993, Power transformers – Part 1: General
2
Amendment 1 (1999)
IEC 60076-2, Power transformers – Part 2: Temperature rise
IEC 60076-3:2000, Power transformers – Part 3: Insulation levels, dielectric tests and external
clearances in air
IEC 60076-5:2000, Power transformers – Part 5: Ability to withstand short circuit
———————
2
There exists a consolidated edition 2.1 (2000) that includes edition 2 and its amendment.

---------------------- Page: 9 ----------------------

60076-13  IEC:2006 – 11 –
IEC 60076-7, Power transformers – Part 7: Loading guide for oil-immersed power
transformers
IEC 60137, Insulated bushings for alternating voltages above 1 000 V
IEC 60270, High-voltage test techniques – Partial discharge measurements
IEC 60282-1, High-voltage fuses – Part 1: Current-limiting fuses
IEC 60296, Fluids for electrotechnical applications – Unused mineral insulating oils for
transformers and switchgear
IEC 60836, Specifications for unused silicone insulating liquids for electrotechnical purposes
IEC 61099, Specifications for unused synthetic organic esters for electrical purposes
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
self-protection function
function integrated into the transformer to prevent external consequences (tank rupture,
explosion, substance spattering, arcing and disturbances to the power supply networks)
resulting from a fault within the transformer
3.2
disconnection function
automatic interruption of the connection between high-voltage terminals and transformer
active part by operation of the self-protection and disconnection device
The purpose of this function is to eliminate current and voltage on the low-voltage side.
3.3
self-protection and disconnection device
SPDD
device which has the self-protection function and the disconnection function
4 Service conditions
The normal service conditions prescribed in IEC 60076-1 apply.
5 Electrical characteristics
5.1 Rated power
The rated power shall comply with 4.3 of IEC 60076-1.
5.2 Highest voltage for equipment
The values of the highest voltage for equipment shall be
– up to 24 kV for the high-voltage winding;
– 1,1 kV for the low-voltage winding.

---------------------- Page: 10 ----------------------

60076-13  IEC:2006 – 13 –
5.3 Windings
5.3.1 High-voltage winding
These transformers are designed for a single primary voltage.
5.3.2 Low-voltage winding
These transformers are designed for a single secondary voltage.
5.4 Tappings
The tapping range shall be limited to ±5 % to ensure satisfactory coordination with the self-
protection system. The preferred tapping ranges are
– 0 %;
– ±2,5 %;
– ±5 %.
The tap shall be selected by the use of an off-circuit tap switch connected to the high-voltage
winding.
5.5 Connection group
Connection groups shall be
– Ii0 or Iin0 for single-phase transformers;
– Yzn or Dyn for transformers up to 160 kVA;
– Dyn for transformers of 250 kVA to 1 000 kVA.
The clock notation figure shall be 1 or 5 or 11 for three-phase transformers; see 3.10.6 of
IEC 60076-1.
5.6 Dimensioning of the low-voltage winding neutral connection
The neutral conductor and terminal of the low-voltage winding shall be dimensioned for rated
current and fault current (fault between phase and neutral conductor).
5.7 Short-circuit impedance
The value of the short-circuit impedance at a reference temperature of 75 °C is in accordance
with 3.2.2.3 of IEC 60076-5.
5.8 Insulation levels and dielectric tests
5.8.1 Low-voltage winding
The separate source a.c. withstand voltage is 10 kV
...