High-voltage switchgear and controlgear - Part 105: Alternating current switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV

IEC 62271-105:2021 is available as IEC 62271-105:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62271-105:2021 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches composed of switches or switch-disconnectors and current-limiting fuses designed so as to be capable of
- breaking, at the rated voltage, any current up to and including the rated short-circuit breaking current;
- making, at the rated voltage, circuits to which the rated short-circuit breaking current applies.
This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- the document has been updated to be in alignment with the second edition of IEC 62271-1:2017;
- rated TRV has been removed (TRV is only a test parameter), as in the latest revision of IEC 62271-100;
- differentiation has been introduced between requirements expressed for fulfilling the function expected from a switch-fuse combination, from requirements only relevant when the function is performed by a stand-alone device. The goal is to avoid duplication or conflicts of requirements with a standard dealing with assemblies, when the function is implemented within such an assembly.

Appareillage à haute tension - Partie 105: Combinés interrupteurs-fusibles pour courant alternatif de tensions assignées supérieures à 1 kV et jusqu'à 52 kV inclus

IEC 62271-105:2021 est disponible sous forme de IEC 62271-105:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 62271-105:2021 est applicable aux appareils tripolaires utilisés dans les réseaux de distribution publics ou les installations industrielles. Ces derniers forment des ensembles fonctionnels composés d'interrupteurs ou d'interrupteurs-sectionneurs et de fusibles limiteurs de courant, conçus pour être capables de
- couper, à la tension assignée, tous les courants jusqu'au pouvoir de coupure assigné en court-circuit inclus;
- établir, à la tension assignée, des circuits pour lesquels le pouvoir de coupure assigné en court-circuit s’applique.
Cette troisième édition annule et remplace la deuxième édition parue en 2012. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le document a été mis à jour conformément à la 2e édition de l’IEC 62271-1:2017;
- la TTR assignée est supprimée (la TTR n’est qu’un paramètre d’essai) comme dans la dernière édition de l’IEC 62271‑100;
- une distinction est désormais faite entre les exigences spécifiées pour l’exécution de la fonction attendue d’un combiné interrupteur-fusibles, et les exigences qui ne sont pertinentes que lorsque la fonction est exécutée par un appareil autonome. Cette distinction a pour but d’éviter des répétitions ou des contradictions d’exigences avec une norme traitant d’ensembles, lorsque la fonction est mise en œuvre au sein d’un tel ensemble.

General Information

Status
Published
Publication Date
14-Jun-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
15-Jun-2021
Ref Project

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IEC 62271-105:2021 - High-voltage switchgear and controlgear - Part 105: Alternating current switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV
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IEC 62271-105
Edition 3.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 105: Alternating current switch-fuse combinations for rated voltages above
1 kV up to and including 52 kV
Appareillage à haute tension –
Partie 105: Combinés interrupteurs-fusibles pour courant alternatif de tensions
assignées supérieures à 1 kV et jusqu'à 52 kV inclus
IEC 62271-105:2021-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62271-105
Edition 3.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 105: Alternating current switch-fuse combinations for rated voltages above
1 kV up to and including 52 kV
Appareillage à haute tension –
Partie 105: Combinés interrupteurs-fusibles pour courant alternatif de tensions
assignées supérieures à 1 kV et jusqu'à 52 kV inclus
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-9864-0

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
---------------------- Page: 3 ----------------------
– 2 – IEC 62271-105:2021  IEC 2021
CONTENTS

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

1 Scope .............................................................................................................................. 7

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

3 Terms and definitions ...................................................................................................... 8

3.1 General terms and definitions ................................................................................. 8

3.2 Assemblies of switchgear and controlgear .............................................................. 8

3.3 Parts of assemblies ................................................................................................ 8

3.4 Switching devices ................................................................................................... 8

3.5 Parts of switchgear and controlgear ........................................................................ 9

3.6 Operational characteristics of switchgear and controlgear ..................................... 10

3.7 Characteristic quantities ....................................................................................... 10

3.101 Fuses.................................................................................................................... 13

4 Normal and special service conditions ........................................................................... 14

5 Ratings .......................................................................................................................... 14

5.1 General ................................................................................................................. 14

5.2 Rated voltage (U ) ................................................................................................ 15

5.3 Rated insulation level (U , U , U ) ....................................................................... 15

d p s

5.4 Rated frequency (f ) .............................................................................................. 15

5.5 Rated continuous current (I ) ................................................................................ 15

5.6 Rated short-time withstand current (I ) ................................................................. 15

5.7 Rated peak withstand current (I ) ......................................................................... 15

5.8 Rated duration of short-circuit (t ) ......................................................................... 15

5.9 Rated supply voltage of auxiliary and control circuits (U ) .................................... 15

5.10 Rated supply frequency of auxiliary and control circuits ........................................ 15

5.11 Rated pressure of compressed gas supply for controlled pressure systems .......... 15

5.101 Rated short-circuit breaking current ...................................................................... 16

5.102 Rated short-circuit making current ........................................................................ 16

5.103 Rated transfer current (striker operation) (I ) ............................................. 16

rtransfer

5.104 Rated take-over current for release-operated combinations (I ) .......................... 16

rto

6 Design and construction ................................................................................................ 16

6.1 Requirements for liquids in switch-fuse combinations ............................................ 16

6.2 Requirements for gases in switch-fuse combinations ............................................ 16

6.3 Earthing of switch-fuse combinations .................................................................... 16

6.4 Auxiliary and control equipment and circuits ......................................................... 17

6.5 Dependent power operation .................................................................................. 17

6.6 Stored energy operation ........................................................................................ 17

6.7 Independent unlatched operation (independent manual or power operation) ......... 17

6.8 Manually operated actuators ................................................................................. 17

6.9 Operation of releases ............................................................................................ 17

6.10 Pressure/level indication ....................................................................................... 17

6.11 Nameplates........................................................................................................... 17

6.12 Locking devices .................................................................................................... 19

6.13 Position indication ................................................................................................. 19

6.14 Degrees of protection provided by enclosures ....................................................... 19

---------------------- Page: 4 ----------------------
IEC 62271-105:2021  IEC 2021 – 3 –

6.15 Creepage distances for outdoor insulators ............................................................ 19

6.16 Gas and vacuum tightness .................................................................................... 19

6.17 Tightness for liquid systems .................................................................................. 19

6.18 Fire hazard (flammability) ..................................................................................... 19

6.19 Electromagnetic compatibility (EMC) ..................................................................... 19

6.20 X-ray emission ...................................................................................................... 19

6.21 Corrosion .............................................................................................................. 19

6.22 Filling levels for insulation, switching and/or operation .......................................... 19

6.101 Linkages between the fuse striker(s) and the switch release ................................. 19

6.102 Low over-current conditions (long fuse-pre-arcing time conditions) ....................... 19

7 Type tests ..................................................................................................................... 20

7.1 General ................................................................................................................. 20

7.1.1 Basics ........................................................................................................... 20

7.1.2 Information for identification of test objects .................................................... 20

7.1.3 Information to be included in type-test reports ............................................... 20

7.2 Dielectric tests ...................................................................................................... 21

7.3 Radio interference voltage (RIV) test .................................................................... 21

7.4 Resistance measurement ...................................................................................... 21

7.5 Continuous current tests ....................................................................................... 21

7.6 Short-time withstand current and peak withstand current tests .............................. 21

7.7 Verification of the protection ................................................................................. 21

7.8 Tightness tests ..................................................................................................... 21

7.9 Electromagnetic compatibility tests (EMC) ............................................................ 21

7.10 Additional tests on auxiliary and control circuits .................................................... 21

7.11 X-radiation test for vacuum interrupters ................................................................ 21

7.101 Making and breaking tests .................................................................................... 22

7.101.1 General ......................................................................................................... 22

7.101.2 Conditions for performing the tests ................................................................ 22

7.101.3 Test-duty procedures ..................................................................................... 28

7.101.4 Behaviour of the combination during tests ..................................................... 33

7.101.5 Condition of the apparatus after testing ......................................................... 34

7.102 Mechanical operation tests ................................................................................... 35

7.103 Mechanical shock tests on fuses ........................................................................... 35

7.104 Thermal test with long pre-arcing time of fuse ....................................................... 35

7.105 Extension of validity of type tests .......................................................................... 36

7.105.1 Dielectric ....................................................................................................... 36

7.105.2 Continuous current tests ................................................................................ 36

7.105.3 Making and breaking ..................................................................................... 36

8 Routine tests ................................................................................................................. 36

8.101 Mechanical operating tests ................................................................................... 37

9 Guide to the selection of switch-fuse combinations (informative) ................................... 37

9.101 Guide to the selection of switch-fuse combination for transformer protection ......... 37

9.101.1 General ......................................................................................................... 37

9.101.2 Rated short-circuit breaking current ............................................................... 38

9.101.3 Primary fault condition caused by a solid short-circuit on the

transformer secondary terminals .................................................................... 38

9.102 Coordination of switch and fuses for extension of the reference list of fuses ......... 39

9.102.1 General ......................................................................................................... 39

9.102.2 Rated continuous current ............................................................................... 39

---------------------- Page: 5 ----------------------
– 4 – IEC 62271-105:2021  IEC 2021

9.102.3 Low over-current performance ....................................................................... 39

9.102.4 Transfer current ............................................................................................. 39

9.102.5 Take-over current .......................................................................................... 39

9.102.6 Extension of the validity of type tests ............................................................. 40

10 Information to be given with enquiries, tenders and orders (informative) ........................ 40

10.1 General ................................................................................................................. 40

10.2 Information with enquiries and orders ................................................................... 40

10.3 Information with tenders ........................................................................................ 40

11 Transport, storage, installation, operating instructions and maintenance........................ 40

12 Safety ............................................................................................................................ 41

13 Influence of the product on the environment .................................................................. 41

Annex A (informative) Example of the coordination of fuses, switch and transformer ............ 42

Annex B (normative) Procedures for determining transfer current ........................................ 45

B.1 Background........................................................................................................... 45

B.2 Mathematical determination of ∆T ......................................................................... 45

B.3 Simplified method for determination of transfer current ......................................... 48

Annex C (normative) Tolerances on test quantities for type tests ......................................... 50

Bibliography .......................................................................................................................... 52

Figure 1 – Arrangement of test circuits for test duties TD and TD .......................... 23

Isc IWmax

Figure 2 – Arrangement of test circuits for test-duty TD ........................................... 24

Itransfer

Figure 3 – Arrangement of test circuits for test-duty TD .................................................... 24

Ito

Figure 4 – Determination of power-frequency recovery voltage ............................................. 26

Figure 5 – Representation of a specified TRV by a two-parameter reference line and a

delay line .............................................................................................................................. 27

Figure 6 – Example of a two-parameter reference line for a TRV .......................................... 28

Figure 7 – Characteristics for determining take-over current ................................................. 32

Figure 8 – Transfer current in relation to the primary fault current I due to a solid

short circuit in the transformer secondary terminal ................................................................ 38

Figure A.1 – Characteristics relating to the protection of an 11 kV, 400 kVA

transformer ........................................................................................................................... 43

Figure A.2 – Discrimination between HV and LV fuses .......................................................... 44

Figure B.1 – Practical determination of the transfer current ................................................... 46

Figure B.2 – Determination of the transfer current with the iterative method .......................... 48

Table 1 – Nameplate information .......................................................................................... 18

Table 2 – Summary of the conditions for combining tests and alternative procedures ........... 23

Table 3 – Values of prospective TRV for test-duty TD based on practice in
Itransfer

Europe .................................................................................................................................. 30

Table 4 – Values of prospective TRV for test-duty TD based on practice in the
Itransfer

United States of America ...................................................................................................... 31

Table 5 – Summary of test parameters for test duties ........................................................... 33

Table C.1 – Tolerances on test quantities for type tests ........................................................ 50

---------------------- Page: 6 ----------------------
IEC 62271-105:2021  IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 105: Alternating current switch-fuse combinations
for rated voltages above 1 kV up to and including 52 kV
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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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.

IEC 62271-105 has been prepared by subcommittee 17A: Switching devices, of IEC technical

committee 17: High-voltage switchgear and controlgear. It is an International Standard.

This third edition cancels and replaces the second edition published in 2012. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) the document has been updated to be in alignment with the second edition of
IEC 62271-1:2017;

b) rated TRV has been removed (TRV is only a test parameter), as in the latest revision of

IEC 62271-100;
---------------------- Page: 7 ----------------------
– 6 – IEC 62271-105:2021  IEC 2021

c) differentiation has been introduced between requirements expressed for fulfilling the

function expected from a switch-fuse combination, from requirements only relevant when

the function is performed by a stand-alone device. The goal is to avoid duplication or

conflicts of requirements with a standard dealing with assemblies, when the function is

implemented within such an assembly.
The text of this International Standard is based the following documents:
FDIS Report on voting
17A/1300/FDIS 17A/1306/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

This document is to be read in conjunction with IEC 62271-1:2017, to which it refers and which

is applicable unless otherwise specified. In order to simplify the indication of corresponding

requirements, the same numbering of clauses and subclauses is used as in IEC 62271-1:2017.

Amendments to these clauses and subclauses are given under the same numbering, whilst

additional subclauses are numbered from 101.

A list of all parts in the IEC 62271 series, published under the general title High-voltage

switchgear and controlgear, can be found on the IEC website.

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

stability date indicated on the IEC website under 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.
---------------------- Page: 8 ----------------------
IEC 62271-105:2021  IEC 2021 – 7 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 105: Alternating current switch-fuse combinations
for rated voltages above 1 kV up to and including 52 kV
1 Scope

This part of IEC 62271 applies to three-pole units for public and industrial distribution systems

which are functional assemblies of switches composed of switches or switch-disconnectors and

current-limiting fuses designed so as to be capable of

– breaking, at the rated voltage, any current up to and including the rated short-circuit

breaking current;

– making, at the rated voltage, circuits to which the rated short-circuit breaking current

applies.

It does not apply to combinations of fuses with circuit-breakers, contactors or circuit switchers,

nor for combinations for motor-circuits nor to combinations incorporating single capacitor bank

switches.

This document applies to combinations designed with rated voltages above 1 kV up to and

including 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz.

In this document, the word "combination" is used for a combination in which the components

constitute a functional assembly. Each association of a given type of switch and a given type

of fuse defines one type of switch-fuse combination. Different types of fuses can be combined

with one type of switch, which give several combinations with different characteristics, in

particular concerning the rated continuous currents.

A switch-fuse combination is therefore defined by its type designation and a list of selected

fuses defin
...

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