Power transformers - Part 22-1: Power transformer and reactor fittings – Protective devices

IEC 60076-22-1:2019 applies to protective devices mounted on liquid-immersed power transformers in accordance with IEC 60076-1 and reactors in accordance with IEC 60076-6 with or without conservator for indoor or outdoor installation. It outlines the service conditions and the mechanical and electrical requirements that are common to all the devices, which are relevant for the safety of the machine having a function of signalization of abnormal operating conditions. It also outlines the operation requirements specific to each device as well as, in some cases, the preferred dimensions relevant for interchangeability and the type and routine test to be performed. Keywords: protective devices mounted on liquid-immersed power transformers

Leistungstransformatoren - Teil 22-1: Anbauten für Leistungstransformatoren und Drosselspulen - Schutzeinrichtungen

Transformateurs de puissance - Partie 22-1: Accessoires pour transformateurs de puissance et bobines d'inductance - Dispositifs de protection

IEC 60076-22-1:2019 s'applique aux dispositifs de protection installés sur des transformateurs de puissance immergés dans un liquide conformes à l'IEC 60076-1 et aux bobines d'inductance conformes à l'IEC 60076-6 avec ou sans conservateur, pour les installations intérieures ou extérieures. Elle présente les conditions de service et les exigences mécaniques et électriques communes à tous les dispositifs, et qui sont pertinentes pour la sécurité de l'appareil et dont la fonction consiste à signaler des conditions anormales d'exploitation. Elle présente également les exigences de fonctionnement spécifiques à chaque dispositif et, dans certains cas, les dimensions préférentielles pertinentes pour l'interchangeabilité, ainsi que les essais de type et individuels de série à réaliser. Mots clés : protection installés sur des transformateurs de puissance immergés dans un liquide

Močnostni transformatorji - 22-1. del: Oprema močnostnega transformatorja in dušilke - Zaščitne naprave

Ta del standarda IEC 60076-22 se uporablja za zaščitne naprave, ki so nameščene na v tekočini potopljenih močnostnih transformatorjih v skladu s standardom IEC 60076-1 in dušilkah v skladu s standardom IEC 60076-6 z raztezno posodo ali brez nje za notranjo in zunanjo namestitev. Določa pogoje obratovanja ter mehanske in električne zahteve, ki so skupne za vse naprave in so pomembne za varnost stroja s funkcijo signaliziranja neobičajnih obratovalnih pogojev.
Določa tudi obratovalne zahteve za posamezne naprave in v nekaterih primerih tudi prednostne dimenzije, ki so pomembne za izmenljivost ter rutinske in tipske preskuse, ki jih je treba opraviti.

General Information

Status
Published
Publication Date
21-Mar-2019
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
28-Jan-2019

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SLOVENSKI STANDARD
SIST EN IEC 60076-22-1:2019
01-julij-2019
Močnostni transformatorji - 22-1. del: Oprema močnostnega transformatorja in
dušilke - Zaščitne naprave

Power transformers - Part 22-1: Power transformer and reactor fittings – Protective

devices

Leistungstransformatoren und Drosselspulen Anbauten - Teil 22-1: Schutzeinrichtungen

Transformateurs de puissance - Partie 22-1: Accessoires pour transformateurs de
puissance et bobines d'inductance - Dispositifs de protection
Ta slovenski standard je istoveten z: EN IEC 60076-22-1:2019
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN IEC 60076-22-1:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60076-22-1:2019
---------------------- Page: 2 ----------------------
SIST EN IEC 60076-22-1:2019
EUROPEAN STANDARD EN IEC 60076-22-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2019
ICS 29.180
English Version
Power transformers - Part 22-1: Power transformer and reactor
fittings - Protective devices
(IEC 60076-22-1:2019)

Transformateurs de puissance - Partie 22-1: Accessoires Leistungstransformatoren und Drosselspulen Anbauten -

pour transformateurs de puissance et bobines d'inductance Teil 22-1: Schutzeinrichtungen

- Dispositifs de protection (IEC 60076-22-1:2019)
(IEC 60076-22-1:2019)

This European Standard was approved by CENELEC on 2019-03-05. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey 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

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60076-22-1:2019 E
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SIST EN IEC 60076-22-1:2019
EN IEC 60076-22-1:2019 (E)
European foreword

The text of document 14/992/FDIS, future edition 1 of IEC 60076-22-1, prepared by IEC/TC 14 "Power

transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN IEC 60076-22-1:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2019-12-05

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-03-05

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.

Endorsement notice

The text of the International Standard IEC 60076-22-1:2019 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60076-6 NOTE Harmonized as EN 60076-6
IEC 60255-27 NOTE Harmonized as EN 60255-27
ISO 9001 NOTE Harmonized as EN ISO 9001
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SIST EN IEC 60076-22-1:2019
EN IEC 60076-22-1:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-3-3 1991 Environmental testing - Part 3-3: Guidance EN 60068-3-3 1993
- Seismic test methods for equipments
IEC 60076-1 2011 Power transformers - Part 1: General EN 60076-1 2011
IEC 60076-7 - Power transformers -- Part 7: Loading - -
guide for oil-immersed power transformers
IEC 60296 - Fluids for electrotechnical applications - EN 60296 -
Unused mineral insulating oils for
transformers and switchgear
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
IEC 60721-3-4 - Classification of environmental conditions - EN 60721-3-4 -
Part 3: Classification of groups of
environmental parameters and their
severities - Section 4: Stationary use at
non-weatherprotected locations
IEC 60947-5-1 - Low-voltage switchgear and controlgear - EN 60947-5-1 -
Part 5-1: Control circuit devices and
switching elements - Electromechanical
control circuit devices
ISO 228-1 - Pipe threads where pressure-tight joints EN ISO 228-1 -
are not made on the threads -- Part 1:
Dimensions, tolerances and designation
ISO 12944-6 - Paints and varnishes - Corrosion protection EN ISO 12944-6 -
of steel structures by protective paint
systems - Part 6: Laboratory performance
test methods
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SIST EN IEC 60076-22-1:2019
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SIST EN IEC 60076-22-1:2019
IEC 60076-22-1
Edition 1.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Power transformers –
Part 22-1: Power transformer and reactor fittings – Protective devices
Transformateurs de puissance –
Partie 22-1: Accessoires pour transformateurs de puissance et bobines
d'inductance – Dispositifs de protection
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-6505-5

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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SIST EN IEC 60076-22-1:2019
– 2 – IEC 60076-22-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 9

4 Service conditions ......................................................................................................... 10

4.1 General ................................................................................................................. 10

4.2 Degree of protection ............................................................................................. 10

4.3 Corrosion protection ............................................................................................. 11

4.4 Resistance to ambient conditions .......................................................................... 11

4.5 Insulating liquid characteristics ............................................................................. 11

4.6 Vibration withstand ............................................................................................... 11

4.7 Seismic requirements............................................................................................ 11

5 Characteristics of switches ............................................................................................ 11

5.1 General ................................................................................................................. 11

5.2 Dielectric strength (in accordance with IEC 60255-27) .......................................... 11

6 General requirements for routine and type test .............................................................. 12

7 Protective devices ......................................................................................................... 12

7.1 Gas and liquid actuated relay (Buchholz relay) ..................................................... 12

7.1.1 Additional service conditions ......................................................................... 12

7.1.2 Mechanical requirements ............................................................................... 12

7.1.3 Performance requirements ............................................................................. 16

7.1.4 Tests ............................................................................................................. 17

7.2 Gas and liquid sampling device at man’s height .................................................... 20

7.2.1 Additional service conditions – Operating pressure ........................................ 20

7.2.2 Mechanical requirements ............................................................................... 20

7.2.3 Performance requirements – Visibility ............................................................ 20

7.2.4 Tests ............................................................................................................. 20

7.3 Protective relay for hermetically sealed liquid-immersed equipment ...................... 21

7.3.1 Additional service conditions ......................................................................... 21

7.3.2 Mechanical requirements ............................................................................... 22

7.3.3 Performance requirements ............................................................................. 24

7.3.4 Tests ............................................................................................................. 25

7.4 Direct reading dial type liquid level indicators ....................................................... 27

7.4.1 Mechanical requirements ............................................................................... 27

7.4.2 Performance requirements ............................................................................. 28

7.4.3 Tests ............................................................................................................. 28

7.5 Liquid flow indicators ............................................................................................ 29

7.5.1 Mechanical requirements ............................................................................... 29

7.5.2 Performance requirements ............................................................................. 31

7.5.3 Tests ............................................................................................................. 31

7.6 Pressure relief devices.......................................................................................... 33

7.6.1 Additional service conditions ......................................................................... 33

7.6.2 Mechanical requirements ............................................................................... 33

7.6.3 Performance requirements ............................................................................. 36

7.6.4 Tests ............................................................................................................. 37

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SIST EN IEC 60076-22-1:2019
IEC 60076-22-1:2019 © IEC 2019 – 3 –

7.7 Pressure relief valves ........................................................................................... 38

7.7.1 Additional service conditions ......................................................................... 38

7.7.2 Mechanical requirements ............................................................................... 38

7.7.3 Performance requirements – Nominal operating pressure .............................. 39

7.7.4 Tests ............................................................................................................. 39

7.8 Direct reading mechanical dial type liquid temperature indicators .......................... 40

7.8.1 Mechanical requirements ............................................................................... 40

7.8.2 Performance requirements ............................................................................. 41

7.8.3 Tests ............................................................................................................. 42

7.9 Direct reading mechanical dial type winding temperature indicators ...................... 44

7.9.1 Mechanical requirements ............................................................................... 44

7.9.2 Performance requirements ............................................................................. 46

7.9.3 Tests ............................................................................................................. 47

7.10 Shutter valve......................................................................................................... 48

7.10.1 Additional service conditions ......................................................................... 48

7.10.2 Mechanical requirements ............................................................................... 48

7.10.3 Functional requirements ................................................................................ 49

7.10.4 Performance requirements ............................................................................. 50

7.10.5 Tests ............................................................................................................. 51

7.11 Liquid-flow controlled relay for on-load tap-changer .............................................. 52

7.11.1 Additional service conditions ......................................................................... 52

7.11.2 Mechanical requirements ............................................................................... 53

7.11.3 Performance requirements ............................................................................. 54

7.11.4 Tests ............................................................................................................. 55

7.12 Sudden pressure relay .......................................................................................... 57

7.12.1 Additional service conditions ......................................................................... 57

7.12.2 Mechanical requirements ............................................................................... 57

7.12.3 Performance requirements ............................................................................. 58

7.12.4 Tests ............................................................................................................. 59

7.13 Dial type gas detecting device .............................................................................. 61

7.13.1 Additional service conditions ......................................................................... 61

7.13.2 Mechanical requirements ............................................................................... 61

7.13.3 Performance requirements – Switches ........................................................... 63

7.13.4 Tests ............................................................................................................. 64

7.14 Gas detecting device for sealed compartment ....................................................... 65

7.14.1 Additional service conditions ......................................................................... 65

7.14.2 Mechanical requirements ............................................................................... 66

7.14.3 Performance requirements ............................................................................. 67

7.14.4 Tests ............................................................................................................. 68

7.15 Leakage detector for insulating liquid to water heat exchangers ............................ 69

7.15.1 Additional service conditions ......................................................................... 69

7.15.2 Mechanical requirements ............................................................................... 70

7.15.3 Performance requirements ............................................................................. 70

7.15.4 Tests ............................................................................................................. 71

Bibliography .......................................................................................................................... 73

Figure 1 – DN 25 to 100 with circular flanges ........................................................................ 14

Figure 2 – DN 25 with threaded connections ......................................................................... 15

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SIST EN IEC 60076-22-1:2019
– 4 – IEC 60076-22-1:2019 © IEC 2019

Figure 3 – Gas and liquid operated relay with rectangular flanges for DN 80 mm .................. 16

Figure 4 – Outline and mounting details: general view .......................................................... 23

Figure 5 – Fixing detail and terminal box arrangement .......................................................... 24

Figure 6 – Flange interface ................................................................................................... 35

Figure 7 – Maximum overall dimensions ............................................................................... 36

Figure 8 – Mounting interface and general overall dimensions .............................................. 39

Figure 9 – General overall dimensions .................................................................................. 54

Figure 10 – Overall dimensions ............................................................................................. 58

Figure 11 – Sudden pressure rise relay response curves ...................................................... 59

Figure 12 – Overall dimensions ............................................................................................. 63

Figure 13 – Mounting arrangement ....................................................................................... 65

Figure 14 – Mounting dimensions ......................................................................................... 67

Table 1 – Dielectric strength of switches – Power frequency ................................................. 12

Table 2 – Dielectric strength of switches – Impulse ............................................................... 12

Table 3 – Preferred dimensions of relay body in mm ............................................................. 14

Table 4 – Flange dimensions in mm ...................................................................................... 14

Table 5 – Alternative dimensions of relay in mm ................................................................... 15

Table 6 – Alternative flange dimensions of the relay in mm ................................................... 15

Table 7 – Making and breaking capacity – Buchholz relay ..................................................... 16

Table 8 – Steady liquid flow for relay operation ..................................................................... 17

Table 9 – Identification of relays ........................................................................................... 23

Table 10 – Making and breaking capacity – Protective relay ................................................. 25

Table 11 – Making and breaking capacity – OLI .................................................................... 28

Table 12 – Making and breaking capacity – OFI .................................................................... 31

Table 13 – Fixing interface dimensions according to Figure 6 ............................................... 34

Table 14 – Overall dimensions according to Figure 7 ............................................................ 35

Table 15 – Making and breaking capacity – PRD .................................................................. 37

Table 16 – Fixing interface and overall dimensions according to Figure 8 ............................. 39

Table 17 – Making and breaking capacity – OTI .................................................................... 42

Table 18 – Making and breaking capacity – WTI ................................................................... 46

Table 19 – Making and breaking capacity – Shutter valve ..................................................... 50

Table 20 – Preferred dimensions of relay body in mm ........................................................... 54

Table 21 – Flange dimensions in mm .................................................................................... 54

Table 22 – Making and breaking capacity – Liquid flow relay ................................................ 55

Table 23 – Making and breaking capacity – Sudden pressure relay ...................................... 59

Table 24 – Making and breaking capacity – Dial type gas detecting device ........................... 63

Table 25 – Making and breaking capacity – Gas detecting device ......................................... 67

Table 26 – Making and breaking capacity – Leakage detector ............................................... 71

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SIST EN IEC 60076-22-1:2019
IEC 60076-22-1:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 22-1: Power transformer and reactor fittings – Protective devices
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,

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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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

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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

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6) All users should ensure that they have the latest edition of this publication.

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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 60076-22-1 has been prepared by IEC technical committee TC14:

Power transformers.
The text of this International Standard is based on the following documents:
FDIS Report on voting
14/992/FDIS 14/997/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 11 ----------------------
SIST EN IEC 60076-22-1:2019
– 6 – IEC 60076-22-1:2019 © IEC 2019

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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SIST EN IEC 60076-22-1:2019
IEC 60076-22-1:2019 © IEC 2019 – 7 –
INTRODUCTION

This Part 22-1 of the IEC 60076 series covers all accessories relevant to the safety of

transformers or reactors and having a function of signalization of abnormal operating

conditions, and outlines the operation requirements specific to each accessory.
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SIST EN IEC 60076-22-1:2019
– 8 – IEC 60076-22-1:2019 © IEC 2019
POWER TRANSFORMERS –
Part 22-1: Power transformer and reactor fittings – Protective devices
1 Scope

This part of IEC 60076-22 applies to protective devices mounted on liquid-immersed power

transformers in accordance with IEC 60076-1 and reactors in accordance with IEC 60076-6

with or without conservator for indoor or outdoor installation. It outlines the service conditions

and the mechanical and electrical requirements that are common to all the devices, which are

relevant for the safety of the machine having a function of signalization of abnormal operating

conditions.

It also outlines the operation requirements specific to each device as well as, in some cases,

the preferred dimensions relevant for interchangeability and the type and routine test to be

performed.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60068-3-3:1991, Environmental testing – Part 3-3: Guidance – Seismic test methods for

equipments
IEC 60076-1:2011, Power transformers – Part 1: General
IEC 60076-7, Power transformers – Part 7: Loading guide for oil-immersed power
transformers
IEC 60296, Fluids for electrotechnical a
...

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