High-voltage switchgear and controlgear - Part 307: Guidance for the extension of validity of type tests of AC metal and solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV (CLC IEC/TR 62271-307:2019)

This Part of IEC 62271, which is a Technical Report, refers to prefabricated metal-enclosed and solid-insulation enclosed (both hereinafter called enclosed) switchgear and controlgear assemblies for alternating current of rated voltages above 1 kV and up to and including 52 kV as specified in IEC 62271-200 and IEC 62271-201, and to other equipment included in the same enclosure with any possible mutual influence.
This Technical Report may be used for the extension of the validity of type tests performed on one test object with a defined set of ratings to another switchgear assembly of the same family with a different set of ratings or different arrangements of components. It supports the selection of representative test objects composed of functional units of a family of switchgear and controlgear aimed at the optimization of type tests in order to perform a consistent conformity assessment.
This Technical Report utilises a combination of sound technical and physical principles, manufacturer and user experience and calculations to establish guidance for the extension of validity of type tests, covering various design and rating aspects.

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 307: Leitfaden für die Erweiterung des Geltungsbereichs von Typprüfungen von metall- und isolierstoffgekapselten Wechselstrom-Schaltanlagen für Bemessungsspannungen über 1 kV und bis einschließlich 52 kV (CLC IEC/TR 62271-307:2019)

Appareillage à haute tension - Partie 307: Lignes directrices pour l'extension de validité des essais de type d'appareillages en courant alternatif sous enveloppe métallique et d’isolation solide pour tensions assignées supérieures à 1 kV et jusqu'à 52 kV inclus (CLC IEC/TR 62271-307:2019)

L'IEC TR 62271-307:2015 se réfère aux ensembles d'appareillage sous enveloppe métallique et d'isolation solide (appelés ci-dessous appareillages sous enveloppe) pour des tensions assignées en courant alternatif supérieures à 1 kV et jusqu'à 52 kV inclus, tels que spécifiés dans l'IEC 62271-200 et l'IEC 62271-201, et aux autres équipements inclus dans la même enveloppe et pouvant avoir une influence mutuelle.
Cette publication doit être lue conjointement avec l' IEC 62271-200:2011 et l' IEC 62271-201:2014.

Visokonapetostne stikalne in krmilne naprave - 307. del: Navodilo za podaljšanje veljavnosti preskusov tipa za izmenične (AC) stikalne in krmilne naprave v kovinskih ohišjih in ohišjih iz trdih izolacijskih materialov za naznačene napetosti nad 1 kV do vključno 52 kV (CLC IEC/TR 62271-307:2019)

Ta del standarda IEC 62271, ki je tehnično poročilo, se navezuje na predizdelane sklope stikalnih in krmilnih naprav v kovinskih ohišjih in ohišjih iz trdih izolacijskih materialov (v nadaljevanju »v ohišju«) za izmenični tok naznačenih napetosti nad 1 kV in do vključno 52 kV, kot je opredeljeno v standardih IEC 62271-200 in IEC 62271-201, ter na drugo opremo, ki je vključena v istem ohišju s kakršnim koli možnim medsebojnim vplivanjem.
To tehnično poročilo je mogoče uporabljati za podaljšanje veljavnosti tipskih preskusov, ki se izvajajo na enem preskušancu z določenim naborom napetosti, na drug sklop stikalnih naprav iz iste družine z drugačnim naborom napetosti ali drugačno razporeditvijo komponent. Podpira izbiro reprezentativnih preskušancev, sestavljenih iz funkcionalnih enot iz družine stikalnih in krmilnih naprav, ki je usmerjena na optimizacijo tipskih preskusov za dosledno ugotavljanje skladnosti.
To tehnično poročilo uporablja kombinacijo smotrnih tehničnih in fizikalnih načel, izkušenj proizvajalcev in uporabnikov ter izračunov za vzpostavitev smernic za podaljšanje veljavnosti tipskih preskusov, ki zajemajo različne vidike zasnove in napetosti.

General Information

Status
Published
Publication Date
18-Aug-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-Jul-2019
Due Date
29-Sep-2019
Completion Date
19-Aug-2019

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SLOVENSKI STANDARD
SIST-TP CLC IEC/TR 62271-307:2019
01-oktober-2019
Visokonapetostne stikalne in krmilne naprave - 307. del: Navodilo za podaljšanje
veljavnosti preskusov tipa za izmenične (AC) stikalne in krmilne naprave v

kovinskih ohišjih in ohišjih iz trdih izolacijskih materialov za naznačene napetosti

nad 1 kV do vključno 52 kV (CLC IEC/TR 62271-307:2019)

High-voltage switchgear and controlgear - Part 307: Guidance for the extension of

validity of type tests of AC metal and solid-insulation enclosed switchgear and

controlgear for rated voltages above 1 kV and up to and including 52 kV (CLC IEC/TR

62271-307:2019)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 307: Leitfaden für die
Erweiterung des Geltungsbereichs von Typprüfungen von metall- und

isolierstoffgekapselten Wechselstrom-Schaltanlagen für Bemessungsspannungen über 1

kV und bis einschließlich 52 kV (CLC IEC/TR 62271-307:2019)

Appareillage à haute tension - Partie 307: Lignes directrices pour l'extension de validité

des essais de type d'appareillages en courant alternatif sous enveloppe métallique et

d’isolation solide pour tensions assignées supérieures à 1 kV et jusqu'à 52 kV inclus

(CLC IEC/TR 62271-307:2019)
Ta slovenski standard je istoveten z: CLC IEC/TR 62271-307:2019
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST-TP CLC IEC/TR 62271-307:2019 en

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

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SIST-TP CLC IEC/TR 62271-307:2019
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SIST-TP CLC IEC/TR 62271-307:2019
TECHNICAL REPORT CLC IEC/TR 62271-307
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
July 2019
ICS 29.130.10
English Version
High-voltage switchgear and controlgear - Part 307: Guidance
for the extension of validity of type tests of AC metal and solid-
insulation enclosed switchgear and controlgear for rated
voltages above 1 kV and up to and including 52 kV
(IEC/TR 62271-307:2015)

Appareillage à haute tension - Partie 307: Lignes directrices Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil

pour l'extension de validité des essais de type 307: Leitfaden für die Erweiterung des Geltungsbereichs

d'appareillages en courant alternatif sous enveloppe von Typprüfungen von metall- und isolierstoffgekapselten

métallique et d'isolation solide pour tensions assignées Wechselstrom-Schaltanlagen für Bemessungsspannungen

supérieures à 1 kV et jusqu'à 52 kV inclus über 1 kV und bis einschließlich 52 kV

(IEC/TR 62271-307:2015) (IEC/TR 62271-307:2015)
This Technical Report was approved by CENELEC on 2019-06-17.

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,

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. CLC IEC/TR 62271-307:2019 E
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SIST-TP CLC IEC/TR 62271-307:2019
CLC IEC/TR 62271-307:2019 (E)
European foreword

This document (CLC IEC/TR 62271-307:2019) consists of the text of IEC/TR 62271-307:2015

prepared by SC 17C "Assemblies" of IEC/TC 17 "High-voltage switchgear and controlgear".

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/TR 62271-307:2015 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 60865-1 NOTE Harmonized as EN 60865-1
IEC 60071-1:2006 NOTE Harmonized as EN 60071-1:2006 (not modified)

IEC 60071-1:2006/A1:2010 NOTE Harmonized as EN 60071-1:2006/A1:2010 (not modified)

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SIST-TP CLC IEC/TR 62271-307:2019
CLC IEC/TR 62271-307:2019 (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 60050-441 1984 International Electrotechnical Vocabulary. - -
Switchgear, controlgear and fuses
+ A1 2000 - -
IEC 62271-1 2007 High-voltage switchgear and controlgear -- EN 62271-1 2008
Part 1: Common specifications
+ A1 2011 + A1 2011
IEC 62271-200 2011 High-voltage switchgear and controlgear - EN 62271-200 2012
Part 200: AC metal-enclosed switchgear
and controlgear for rated voltages above 1
kV and up to and including 52 kV
IEC 62271-201 2014 High-voltage switchgear and controlgear - EN 62271-201 2014
Part 201: AC solid-insulation enclosed
switchgear and controlgear for rated
voltages above 1 kV and up to and
including 52 kV
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SIST-TP CLC IEC/TR 62271-307:2019
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SIST-TP CLC IEC/TR 62271-307:2019
IEC TR 62271-307
Edition 1.0 2015-09
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
High-voltage switchgear and controlgear –
Part 307: Guidance for the extension of validity of type tests of AC metal and
solid-insulation enclosed switchgear and controlgear for rated voltages above
1 kV and up to and including 52 kV
Appareillage à haute tension –
Partie 307: Lignes directrices pour l'extension de validité des essais de type
d'appareillages en courant alternatif sous enveloppe métallique et d’isolation
solide pour tensions assignées supérieures à 1 kV et jusqu'à 52 kV inclus
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-2903-3

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-TP CLC IEC/TR 62271-307:2019
– 2 – IEC TR 62271-307:2015  IEC 2015
CONTENTS

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

1 General ........................................................................................................................... 7

1.1 Scope ..................................................................................................................... 7

1.2 Normative references .............................................................................................. 7

2 Terms and definitions ...................................................................................................... 7

3 Use of extension criteria .................................................................................................. 9

3.1 General ................................................................................................................... 9

3.2 Parameters for extension criteria .......................................................................... 10

3.3 Use of calculations ................................................................................................ 10

3.3.1 General ......................................................................................................... 10

3.3.2 Temperature rise calculations ........................................................................ 11

3.3.3 Electric field calculations ............................................................................... 11

3.3.4 Mechanical stress calculations....................................................................... 11

3.3.5 Short-circuit current calculations .................................................................... 11

3.3.6 Internal arc pressure rise calculations ............................................................ 12

3.4 Information needed for extension of type test validity ............................................ 12

4 Application of extension criteria ..................................................................................... 12

4.1 Dielectric tests ...................................................................................................... 12

4.2 Temperature rise tests .......................................................................................... 13

4.3 Mechanical tests ................................................................................................... 15

4.4 Short-time and peak withstand current tests .......................................................... 15

4.5 Making and breaking tests .................................................................................... 16

4.6 Internal arc fault tests ........................................................................................... 17

4.6.1 General ......................................................................................................... 17

4.6.2 Extension criteria with respect to design ........................................................ 17

4.6.3 Extension criteria with respect to ratings and installation conditions .............. 18

5 Extending the validity of type tests ................................................................................ 19

5.1 General ................................................................................................................. 19

5.2 Extension of validity of a test report to other functional units (situation a) ............. 20

5.3 Validation of a family by selection of test objects (situation b) ............................... 21

5.3.1 General ......................................................................................................... 21

5.3.2 Mapping of the family .................................................................................... 21

5.3.3 Specification of test objects ........................................................................... 22

5.4 Validation of an assembly by existing test reports (situation c) .............................. 22

5.5 Validation of a design modification (situation d) .................................................... 23

Annex A (informative) Rationale for the extension criteria .................................................... 24

A.1 General ................................................................................................................. 24

A.2 Dielectric tests ...................................................................................................... 24

A.2.1 General ......................................................................................................... 24

A.2.2 Clearances (Items 1 and 2) ............................................................................ 24

A.2.3 Insulating supports and material (Items 3 and 4) ............................................ 24

A.2.4 Live parts (Items 5 and 6) .............................................................................. 25

A.2.5 Open contact gap and isolating distance (Items 7 and 8) ............................... 25

A.2.6 Minimum functional pressure for insulation (Item 9) ....................................... 25

A.3 Temperature rise tests .......................................................................................... 25

A.3.1 General ......................................................................................................... 25

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IEC TR 62271-307:2015  IEC 2015 – 3 –

A.3.2 Centre distance between phase conductors (Item 1) ...................................... 26

A.3.3 Phase to earth distance (Item 2) .................................................................... 26

A.3.4 Enclosure and compartment volume (Item 3) ................................................. 26

A.3.5 Insulating gas (Item 4) ................................................................................... 27

A.3.6 Conductors (Items 5 and 6) ........................................................................... 27

A.3.7 Conductor joints and connections (Items 7, 8 and 9) ...................................... 27

A.3.8 Ventilation area of partitions and enclosure (Item 10) .................................... 27

A.3.9 Power dissipation of components (Item 11) .................................................... 28

A.3.10 Insulating barriers (Item 12) ........................................................................... 28

A.3.11 Insulating coating of conductors and enclosures (Item 13 and 14) ................. 28

A.3.12 Insulating material in contact with conductors (Item 15) ................................. 29

A.4 Mechanical tests ................................................................................................... 29

A.4.1 General ......................................................................................................... 29

A.4.2 Shutter systems (Item 1) ................................................................................ 29

A.4.3 Contacts of removable parts (Item 2) ............................................................. 30

A.4.4 Interlocking systems (Items 3 and 4).............................................................. 30

A.5 Short-time and peak withstand current tests .......................................................... 30

A.5.1 General ......................................................................................................... 30

A.5.2 Centre distance between phase conductors (Item 1) ...................................... 31

A.5.3 Conductors (Items 2, 5 and 6)........................................................................ 31

A.5.4 Insulating conductor supports (Items 3 and 4) ................................................ 31

A.5.5 Insulating material in contact with conductors (Item 7) ................................... 32

A.5.6 Enclosure, partitions or bushings (Item 8) ...................................................... 32

A.5.7 Contacts of removable part (Item 9) ............................................................... 32

A.6 Making and breaking tests .................................................................................... 32

A.6.1 General ......................................................................................................... 32

A.6.2 Clearance between phases and to earth (Items 1 and 2) ................................ 33

A.6.3 Enclosure and compartment volume (Item 3) ................................................. 33

A.6.4 Insulating gas (Item 4) ................................................................................... 33

A.6.5 Conductors (Items 5 and 6) ........................................................................... 33

A.6.6 Insulating supports (Items 7, 8 and 9) ............................................................ 33

A.7 Internal arc fault tests ........................................................................................... 34

A.7.1 General ......................................................................................................... 34

A.7.2 Clearance between phases and to earth (Items 1 and 2) ................................ 34

A.7.3 Compartment volume (Item 3) ........................................................................ 34

A.7.4 Pressure of insulating gas (Item 4) ................................................................ 35

A.7.5 Material in the region of arc initiation (Items 5, 6, 7 and 8) ............................. 35

A.7.6 Pressure relief opening devices (Items 9, 10 and 11) ..................................... 35

A.7.7 Enclosure and compartments (Items 12, 13, 14 and 15) ................................. 36

A.8 Rationale for extension criteria with respect to arc fault ratings and

installation conditions ........................................................................................... 36

A.8.1 General ......................................................................................................... 36

A.8.2 Rated arc fault current and duration (items 1 and 2) ...................................... 36

A.8.3 Rated voltage (item 3) ................................................................................... 36

A.8.4 Rated frequency (item 4) ............................................................................... 37

A.8.5 Arrangement of assembly (items 5, 6 and 7) .................................................. 37

A.8.6 Indoor or outdoor installation (item 8) ............................................................ 37

A.8.7 Type of accessibility (item 9) ......................................................................... 37

A.8.8 Accessible sides (item 10) ............................................................................. 37

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– 4 – IEC TR 62271-307:2015  IEC 2015

Annex B (informative) Examples for the extension of validity of type tests ............................ 38

B.1 General ................................................................................................................. 38

B.2 Design modification of a cable terminal in air insulated switchgear (AIS)............... 38

B.3 Design modification of an AIS bus riser functional unit by adding current

transformers ......................................................................................................... 39

B.4 Design modification of a key-lock in the door of a functional unit of AIS ................ 41

B.5 Extension of a ring-main unit (GIS) to functional units with larger width................. 41

B.6 Extension of a family of gas insulated switchgear (GIS) by a functional unit .......... 43

Bibliography .......................................................................................................................... 46

Figure 1 – Extension of validity of one test report; situation a) .............................................. 20

Figure 2 – Validation of a family by selection of appropriate test objects; situation b) ............ 21

Figure 3 – Validation of actual assembly with existing test reports; situation c) ..................... 23

Figure B.1 – Cable terminals in the connection compartment of air insulated switchgear....... 38

Figure B.2 – Addition of block-type current transformers into the bus riser functional

unit of air insulated switchgear .............................................................................................. 40

Figure B.3 – Special type of key-lock as replacement for a standard key-lock in the

door of air insulated switchgear ............................................................................................ 41

Figure B.4 – Front view and top cross sectional view of a combination of functional

units making up a ring-main unit ........................................................................................... 42

Figure B.5 – Cross-section of two different functional units of GIS ........................................ 44

Table 1 – Examples of design parameters............................................................................. 10

Table 2 – Extension criteria for dielectric withstand performance .......................................... 13

Table 3 – Extension criteria for temperature rise performance .............................................. 14

Table 4 – Extension criteria for mechanical performance ...................................................... 15

Table 5 – Extension criteria for short-time and peak withstand current performance ............. 16

Table 6 – Extension criteria for making and breaking capacity .............................................. 17

Table 7 – Extension criteria for internal arc fault withstand performance ............................... 18

Table 8 – Extension criteria for internal arc fault classification with respect to

installation conditions ........................................................................................................... 19

Table B.1 – Affirmation of extension criteria with respect to dielectric withstand

performance of a functional unit ............................................................................................ 39

Table B.2 – Affirmation of extension criteria with respect to short-time current

withstand performance of a functional unit ............................................................................ 40

Table B.3 – Affirmation of extension criteria with respect to temperature rise

performance of a ring-main-unit ............................................................................................ 43

Table B.4 – Affirmation of extension criteria with respect to internal arc classification of

a GIS circuit-breaker compartment ........................................................................................ 44

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SIST-TP CLC IEC/TR 62271-307:2019
IEC TR 62271-307:2015  IEC 2015 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 307: Guidance for the extension of validity of type tests of
AC metal and solid-insulation enclosed switchgear and controlgear
for rated voltages above 1 kV and up to and including 52 kV
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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.

The main task of IEC technical committees is to prepare International Standards. However, a

technical committee may propose the publication of a technical report when it has collected

data of a different kind from that which is normally published as an International Standard, for

example "state of the art".

IEC TR 62271-307, which is a technical report, has been prepared by subcommittee 17C:

Assemblies, of IEC technical committee 17: High-voltage switchgear and controlgear.

This Technical Report is to be read in conjunction with IEC 62271-200 published in 2011 and

IEC 62271-201 published in 2014.
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SIST-TP CLC IEC/TR 62271-307:2019
– 6 – IEC TR 62271-307:2015  IEC 2015
The text of this Technical Report is based on the following documents:
Enquiry draft Report on voting
17C/625/DTR 17C/632/RVC

Full information on the voting for the approval of this Technical Report 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.

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 publication will remain unchanged until

the stability 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.

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-TP CLC IEC/TR 62271-307:2019
IEC TR 62271-307:2015  IEC 2015 – 7 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 307: Guidance for the extension of validity of type tests of
AC metal and solid-insulation enclosed switchgear and controlgear
for rated voltages above 1 kV and up to and including 52 kV
1 General
1.1 Scope

This Part of IEC 62271, which is a Technical Report, refers to prefabricated metal-enclosed

and solid-insulation enclosed (both hereinafter called enclosed) switchgear and controlgear

assemblies for alternating current of rated voltages above 1 kV and up to and including 52 kV

as specified in IEC 62271-200 and IEC 62271-201, and to other equipment included in the

same enclosure with any possible mutual influence.

This Technical Report may be used for the extension of the validity of type tests performed on

one test object with a defined set of ratings to another switchgear assembly of the same

family with a different set of ratings or different arrangements of components. It supports the

selection of representative test objects composed of functional units of a family of switchgear

and controlgear aimed at the optimization of type tests in order to perform a consistent

conformity assessment.

This Technical Report utilises a combination of sound technical and physical principles,

manufacturer and user experience and calculations to establish guidance for the extension of

validity of type tests, covering various design and rating aspects.
1.2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for
...

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