SIST EN 62271-201:2014

High-voltage switchgear and controlgear - Part 201: AC solid-insulated enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

IEC 62271-201:2014 specifies requirements for prefabricated solid-insulation enclosed switchgear and controlgear for alternating current of rated voltages above 1 kV and up to and including 52 kV for indoor installation and for service frequencies up to and including 60 Hz. This second edition cancels and replaces the first edition, published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:  a) apart from updating with the second edition of IEC 62271-200 (issued in 2011), definitions, classifications and testing procedures have been specified more precisely;  b) access to the solid-insulation enclosed switchgear and controlgear is now restricted to authorized personnel only. This implies that 'accessibility class B' (public access) has been deleted throughout the document;  c) the term 'protection category' has been introduced to replace the term 'protection grade' (PA, PB1 and PB2).

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 201: Isolierstoffgekapselte Wechselstrom-Schaltanlagen für Bemessungsspannungen über 1 kV bis einschließlich 52 kV

Appareillage à haute tension - Partie 201: Appareillage sous enveloppe isolante solide pour courant alternatif de tensions assignées supérieures à 1 kV et inférieures ou égales à 52 kV

L'IEC 62271-201:2014 spécifie les exigences pour l'appareillage préfabriqué sous enveloppe isolante solide pour courant alternatif, prévu pour être installé à l'intérieur, pour des tensions assignées supérieures à 1 kV et inférieures ou égales à 52 kV et pour des fréquences de service inférieures ou égales à 60 Hz. Cette deuxième édition annule et remplace la première édition, parue en 2006. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  a) outre la mise à jour de la deuxième édition de l'IEC 62271-200 (parue en 2011), les définitions, classifications et procédures d'essai ont été spécifiées de manière plus précise;   b) l'accès aux appareillages sous enveloppe isolante solide est désormais limité au seul personnel autorisé. Ceci signifie la suppression de la 'classe d'accessibilité B' (accès par le public) dans l'ensemble du document;  c) le terme 'catégorie de protection' a été introduit afin de remplacer le terme 'classe de protection' (PA, PB1 et PB2).

Visokonapetostne stikalne in krmilne naprave - 201. del: Izolacijsko obdane izmenične stikalne in krmilne naprave za napetosti nad 1 kV in do vključno 52 kV (IEC 62271-201:2014)

Standard EN IEC 62271-201 določa zahteve za predizdelane izolacijsko obdane stikalne in krmilne naprave v kovinskih ohišjih za naznačene izmenične napetosti nad 1 kV do vključno 52 kV za notranjo namestitev in za frekvence delovanja do vključno 60 Hz. Dostop do stikalnih in krmilnih naprav je omejen samo na pooblaščeno osebje. OPOMBA 1 V tem dokumentu je visoka napetost (IEC 60050-601:1985, 601-01-27) nazivna napetost nad 1 000 V. Srednja napetost (IEC 60050-601:1985, 601-01-28) se običajno uporablja v razdelilnih sistemih z napetostmi nad 1 kV in vključno do 52 kV; glejte točko [1] v bibliografiji. OPOMBA 2 Čeprav se običajno uporablja za trifazne sisteme, je mogoče ta standard uporabiti tudi za eno- ali dvofazne sisteme. Okrovi lahko zajemajo fiksne in premične dele in so lahko za dodatno izolacijo napolnjeni s tekočino (kapljevino ali plinom). Pri stikalnih in krmilnih napravah z oddelki, napolnjenimi s plinom, je predvideni tlak omejen na največ 300 kPa (relativni tlak). Izolacijsko obdane stikalne in krmilne naprave, ki ustrezajo temu standardu, je mogoče varno prijemati med napajanjem. Za izolacijsko obdane stikalne in krmilne naprave za posebno uporabo, na primer v gorljivih atmosferah, rudnikih ali na ladjah, lahko veljajo dodatne zahteve. Komponente v izolacijsko obdanih stikalnih in krmilnih napravah so zasnovane in preskušene v skladu z ustreznimi standardi. Ta standard dopolnjuje standarde za posamezne komponente v zvezi z namestitvijo v stikalnih in krmilnih napravah. Ta standard ne izključuje vključitve druge opreme v istem ohišju. V takem primeru naj bi se upoštevalo morebiten vpliv takšne opreme na stikalno in krmilno napravo.

General Information

• Status: Published
• Publication Date: 18-Sep-2014
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 22-Aug-2014
• Due Date: 27-Oct-2014
• Completion Date: 19-Sep-2014
• Ref Project: EN 62271-201:2014 - High-voltage switchgear and controlgear - Part 201: AC solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

Relations

• Replaces: SIST EN 62271-201:2007 - High-voltage switchgear and controlgear -- Part 201: AC insulation-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
• Effective Date: 01-Oct-2014
• Revised: kSIST FprEN IEC 62271-201:2025 - High-voltage switchgear and controlgear - Part 201: AC solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
• Effective Date: 25-Jan-2023

Overview

EN 62271-201:2014 (CLC adoption of IEC 62271-201:2014) is the European standard for AC solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV. It applies to prefabricated, solid‑insulation indoor installations for service frequencies up to 60 Hz. This second edition supersedes the 2006 edition and introduces technical revisions that tighten definitions, testing procedures and access/protection rules.

Key topics and technical requirements

• Scope and ratings: Defines rated voltages, rated insulation levels, rated frequency, rated normal current and temperature rise, short‑time and peak withstand currents, and rated durations of short circuit.
• Design and construction: Requirements for solid insulating enclosures, high‑voltage compartments, removable parts, ventilation, gas and liquid tightness, and materials (flammability, corrosion).
• Safety & access: Access is restricted to authorized personnel only; “accessibility class B” (public access) has been removed. The standard introduces protection category terminology to replace former protection grades.
• Internal arc classification (IAC): Defines accessibility types, classified sides and rated arc fault currents/durations to withstand and contain internal arcs.
• Electromagnetic compatibility (EMC) & emissions: Requirements to control EMC and limit X‑ray emissions where applicable.
• Earthing, interlocks & position indication: Specifies earthing arrangements for conductive parts and enclosures, mechanical/electrical interlocks, and position indication for safe operation.
• Type and dielectric tests: Grouping and reporting of type tests, dielectric testing (power‑frequency and DC cable test voltages), partial discharge and other routine/acceptance tests.
• Enclosures and mechanical protection: Degree of protection (IP), impact resistance (IK), inspection windows, partitions and ventilating openings.

Practical applications and users

EN 62271-201:2014 is essential for:

• Utility and substation designers specifying indoor solid‑insulation switchgear for medium/high‑voltage distribution (1–52 kV)
• OEM manufacturers and suppliers of prefabricated solid‑insulation switchgear and controlgear
• Testing laboratories and certification bodies performing type and routine tests
• Asset owners, installation contractors and maintenance teams ensuring compliance, safe access and internal arc protection
• Procurement and specifications teams referencing harmonized European / IEC requirements

Using this standard helps ensure reliable performance, operator safety, and regulatory conformity of indoor solid‑insulation high‑voltage switchgear assemblies.

Related standards

• EN/IEC 62271-1 (Common specifications)
• EN/IEC 62271-200 (AC metal‑enclosed switchgear - alignment referenced in the revision)
• Applicable IEC test standards (e.g., IEC 60060-1, IEC 60270) and IP/IK standards referenced within EN 62271-201:2014.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2014
1DGRPHãþD
SIST EN 62271-201:2007
9LVRNRQDSHWRVWQHVWLNDOQHLQNUPLOQHQDSUDYHGHO,]RODFLMVNRREGDQH
L]PHQLþQHVWLNDOQHLQNUPLOQHQDSUDYH]DQDSHWRVWLQDGN9LQGRYNOMXþQRN9
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High-voltage switchgear and controlgear - Part 201: AC solid-insulated enclosed
switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
Appareillage à haute tension - Partie 201: Appareillage sous enveloppe isolante solide
pour courant alternatif de tensions assignées supérieures à 1 kV et inférieures ou égales
à 52 kV
Ta slovenski standard je istoveten z: EN 62271-201:2014
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62271-201

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 29.130.10 Supersedes EN 62271-201:2006
English Version
High-voltage switchgear and controlgear - Part 201: AC solid-
insulation enclosed switchgear and controlgear for rated
voltages above 1 kV and up to and including 52 kV
(IEC 62271-201:2014)
Appareillage à haute tension - Partie 201: Appareillage Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil
sous enveloppe isolante solide pour courant alternatif de 201: Isolierstoffgekapselte Wechselstrom-Schaltanlagen für
tensions assignées supérieures à 1 kV et inférieures ou Bemessungsspannungen über 1 kV bis einschließlich 52 kV
égales à 52 kV (IEC 62271-201:2014)
(CEI 62271-201:2014)
This European Standard was approved by CENELEC on 2014-05-01. 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 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62271-201:2014 E
Foreword
The text of document 17C/594/FDIS, future edition 2 of IEC 62271-201, prepared by SC 17C
“High-voltage switchgear and controlgear assemblies” of IEC TC 17 “Switchgear and controlgear" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62271-201:2014.

The following dates are fixed:
(dop) 2015-02-01
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-05-01
standards conflicting with the
document have to be withdrawn
This document supersedes EN 62271-201:2006.

201:2006:
a) apart from updating with the second edition of EN 62271-200:2012, definitions,
classifications and testing procedures have been specified more precisely;
b) access to the solid-insulation enclosed switchgear and controlgear is now restricted to
authorized personnel only. This implies that “accessibility class B” (public access) has
been deleted throughout the document;
c) the term “protection category” has been introduced to replace the term “protection grade”
(PA, PB1 and PB2)
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62271-201:2014 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 60059:1999 NOTE Harmonized as EN 60059:1999.
IEC 60243-1:2013 NOTE Harmonized as EN 60243-1:2013.
IEC 60507:1991 NOTE Harmonized as EN 60507:1993.
IEC 60909-0:2001 NOTE Harmonized as EN 60909-0:2001.
IEC 61936-1:2010 NOTE Harmonized as EN 61936-1:2010.
IEC 62271-200:2011 NOTE Harmonized as EN 62271-200:2012.
IEC 62271-4:2013 NOTE Harmonized as EN 62271-4:2013.
IEC/TS 62271-304:2008 NOTE Harmonized as CLC/TS 62271-304:2008.

- 3 - EN 62271-201:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 series International Electrotechnical Vocabulary - - series
Part 103: Mathematics - Functions
IEC 60060-1 2010 High-voltage test techniques -- Part 1: EN 60060-1 2010
General definitions and test requirements
IEC 60270 2000 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
+EN 1993
60529:1991/corrige
ndum May 1993
IEC 62262 2002 Degrees of protection provided by EN 62262 2002
enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62271-1 2007 High-voltage switchgear and controlgear -- EN 62271-1 2008
Part 1: Common specifications
IEC 62271-100 2008 High-voltage switchgear and controlgear -- EN 62271-100 2009
Part 100: Alternating current circuit-
breakers
IEC 62271-102 2001 High-voltage switchgear and controlgear -- EN 62271-102 2002
Part 102: Alternating current disconnectors
and earthing switches
+EN 62271- 2008
102:2002/corrigend
um Jul. 2008
+EN 62271- 2005
102:2002/corrigend
um Mar. 2005
+A1 2011  +A1 2011
+A2 2013  +A2 2013
IEC 62271-103 2011 High-voltage switchgear and controlgear -- EN 62271-103 2011
Part 103: Switches for rated voltages
above 1 kV up to and including 52 kV
IEC 62271-105 2012 High-voltage switchgear and controlgear -- EN 62271-105 2012
Part 105: Alternating current switch-fuse
combinations for rated voltages above 1 kV
up to and including 52 kV
IEC 62271-106 2011 High-voltage switchgear and controlgear -- EN 62271-106 2011
Part 106: Alternating current contactors,
contactor-based controllers and motor-
starters
ISO/IEC Guide 51 1999 Safety aspects - Guidelines for their - -
inclusion in standards
IEC 62271-201 ®
Edition 2.0 2014-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –

Part 201: AC solid-insulation enclosed switchgear and controlgear for rated

voltages above 1 kV and up to and including 52 kV

Appareillage à haute tension –

Partie 201: Appareillage sous enveloppe isolante solide pour courant alternatif

de tensions assignées supérieures à 1 kV et inférieures ou égales à 52 kV

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XD
ICS 29.130.10 ISBN 978-2-8322-1482-4

– 2 – IEC 62271-201:2014 © IEC 2014
CONTENTS
FOREWORD . 8
1 General . 10
1.1 Scope . 10
1.2 Normative references . 10
2 Normal and special service conditions . 11
3 Terms and definitions . 11
3.1 Index of definitions . 19
4 Ratings . 21
4.1 Rated voltage (U ) . 21
r
4.1.2 Range II for rated voltages above 245 kV . 21
4.2 Rated insulation level . 22
4.3 Rated frequency (f ) . 22
r
4.4 Rated normal current and temperature rise . 22
4.4.1 Rated normal current (I ) . 22
r
4.4.2 Temperature rise . 22
4.5 Rated short-time withstand current (I ) . 22
k
4.5.101 Rated short-time withstand current (I ) . 22
k
4.5.102 Rated short-time phase to earth withstand current (I ) . 22
ke
4.6 Rated peak withstand current (I ) . 22
p
4.6.101 Rated peak withstand current (I ) . 23
p
4.6.102 Rated peak phase to earth withstand current (I ) . 23
pe
4.7 Rated duration of short circuit (t ) . 23
k
4.7.101 Rated duration of short circuit (t ) . 23
k
4.7.102 Rated duration of phase to earth short circuit (t ) . 23
ke
4.8 Rated supply voltage of closing and opening devices and of auxiliary and
control circuits (U ) . 23
a
4.9 Rated supply frequency of closing and opening devices and of auxiliary
circuits . 23
4.10 Rated pressure of compressed gas supply for controlled pressure
systems . 23
4.11 Rated filling levels for insulation and/or operation . 23
4.101 Ratings of the internal arc classification (IAC) . 23
4.101.1 General . 23
4.101.2 Types of accessibility. 23
4.101.3 Classified sides . 24
4.101.4 Rated arc fault currents (I , I ) . 24
A Ae
4.101.5 Rated arc fault duration (t , t ) . 24
A Ae
4.102 Rated cable test voltages . 24
4.102.1 General . 24
4.102.2 Rated power-frequency cable test voltage U (a.c.) . 25
ct
4.102.3 Rated d.c. cable test voltage U (d.c.) . 25
ct
5 Design and construction . 25
5.1 Requirements for liquids in switchgear and controlgear . 25
5.2 Requirements for gases in switchgear and controlgear . 25
5.3 Earthing of switchgear and controlgear . 26
5.3.101 Earthing of the high-voltage conductive parts . 26
5.3.102 Earthing of the enclosure . 26

IEC 62271-201:2014 © IEC 2014 – 3 –
5.3.103 Earthing of earthing devices . 26
5.3.104 Earthing of withdrawable and removable parts . 26
5.3.105 Earthing circuit . 26
5.4 Auxiliary and control equipment . 27
5.5 Dependent power operation . 27
5.6 Stored energy operation . 27
5.7 Independent manual or power operation (independent unlatched
operation) . 27
5.8 Operation of releases . 27
5.9 Low- and high-pressure interlocking and monitoring devices . 27
5.10 Nameplates. 27
5.11 Interlocking devices . 29
5.12 Position indication . 29
5.13 Degrees of protection by enclosures . 30
5.13.1 Protection of persons against access to hazardous parts and
protection of the equipment against ingress of solid foreign
objects (IP coding) . 30
5.13.2 Protection against ingress of water (IP coding) . 30
5.13.3 Protection of equipment against mechanical impact under
normal service conditions (IK coding) . 30
5.14 Creepage distances for outdoor insulators . 30
5.15 Gas and vacuum tightness . 30
5.16 Liquid tightness . 30
5.17 Fire hazard (flammability) . 30
5.18 Electromagnetic compatibility (EMC) . 30
5.19 X-ray emission . 30
5.20 Corrosion . 30
5.101 Internal arc fault . 31
5.102 Solid insulating enclosure . 31
5.102.1 General . 31
5.102.2 Protection category of the solid insulating enclosure against
electric shock . 31
5.102.3 Requirements for protection categories. 32
5.102.4 Covers and doors . 33
5.102.5 Partition or shutter being part of the enclosure . 33
5.102.6 Inspection windows. 34
5.102.7 Ventilating openings, vent outlets . 34
5.103 High-voltage compartments. 34
5.103.1 General . 34
5.103.2 Fluid-filled compartments (gas or liquid) . 35
5.103.3 Partitions and shutters . 36
5.104 Removable parts . 37
5.105 Provisions for dielectric tests on cables . 37
6 Type tests . 37
6.1 General . 37
6.1.1 Grouping of tests . 38
6.1.2 Information for identification of specimens . 39
6.1.3 Information to be included in type-test reports . 39
6.2 Dielectric tests . 39
6.2.1 Ambient air conditions during tests . 39

– 4 – IEC 62271-201:2014 © IEC 2014
6.2.2 Wet test procedure . 39
6.2.3 Conditions of switchgear and controlgear during dielectric
tests . 39
6.2.4 Criteria to pass the test . 39
6.2.5 Application of the test voltage and test conditions . 39
6.2.6 Tests of switchgear and controlgear of U ≤ 245 kV . 40
r
6.2.7 Tests of switchgear and controlgear of U >245 kV . 41
r
6.2.8 Artificial pollution tests for outdoor insulators . 41
6.2.9 Partial discharge tests . 41
6.2.10 Dielectric tests on auxiliary and control circuits . 42
6.2.11 Voltage test as condition check . 42
6.2.101 Dielectric tests on cable testing circuits . 42
6.3 Radio interference voltage (r.i.v.) test . 43
6.4 Measurement of the resistance of circuits . 43
6.4.1 Main circuit . 43
6.4.2 Auxiliary circuits . 43
6.4.101 Requirement for protection category PB2 . 43
6.5 Temperature-rise tests . 43
6.5.1 Conditions of the switchgear and controlgear to be tested . 44
6.5.2 Arrangement of the equipment . 44
6.5.3 Measurement of the temperature and the temperature rise . 44
6.5.4 Ambient air temperature . 44
6.5.5 Temperature-rise test of the auxiliary and control equipment . 44
6.5.6 Interpretation of the temperature-rise tests . 44
6.6 Short-time withstand current and peak withstand current tests . 44
6.6.1 Arrangement of the switchgear and controlgear and of the test
circuit . 45
6.6.2 Test current and duration . 46
6.6.3 Behaviour of switchgear and controlgear during test . 46
6.6.4 Condition of switchgear and controlgear after test . 46
6.7 Verification of the protection . 46
6.7.1 Verification of the IP coding . 46
6.7.2 Verification of the IK coding . 46
6.8 Tightness tests . 46
6.9 Electromagnetic compatibility tests (EMC) . 46
6.10 Additional tests on auxiliary and control circuits . 46
6.10.1 General . 46
6.10.2 Functional tests . 46
6.10.3 Electrical continuity of earthed metallic parts test . 46
6.10.4 Verification of the operational characteristics of auxiliary
contacts . 47
6.10.5 Environmental tests . 47
6.10.6 Dielectric test . 47
6.11 X-radiation test procedures for vacuum interrupters . 47
6.101 Verification of making and breaking capacities . 47
6.101.1 General . 47
6.101.2 Test requirements for main switching devices . 48
6.101.3 Test requirements for earthing function . 48
6.102 Mechanical operation tests . 48
6.102.1 Switching devices and removable parts . 48

IEC 62271-201:2014 © IEC 2014 – 5 –
6.102.2 Interlocks . 49
6.103 Pressure withstand test for gas-filled compartments. 50
6.103.1 Pressure withstand test for gas-filled compartments with
pressure relief devices . 50
6.103.2 Pressure withstand test for gas-filled compartments without
pressure relief devices . 50
6.104 Tests to prove the protection of persons against electric shock . 50
6.104.1 General . 50
6.104.2 Dielectric tests . 50
6.104.3 Measurements of leakage currents . 51
6.105 Internal arcing test . 51
6.105.1 General . 51
6.105.2 Test conditions . 52
6.105.3 Arrangement of the equipment . 53
6.105.4 Test procedure . 53
6.105.5 Criteria to pass the test . 53
6.105.6 Test report . 54
6.105.7 Transferability of test results . 55
6.106 Thermal stability test . 55
6.107 Humidity test . 55
7 Routine tests . 55
7.1 Dielectric test on the main circuit . 56
7.2 Tests on auxiliary and control circuits . 56
7.3 Measurement of the resistance of the main circuit . 56
7.4 Tightness test . 57
7.5 Design and visual checks . 57
7.101 Partial discharge test . 57
7.102 Mechanical operation tests . 57
7.103 Pressure tests of gas-filled compartments . 57
7.104 Tests of auxiliary electrical, pneumatic and hydraulic devices . 57
7.105 Tests after erection on site . 58
7.106 Measurement of fluid condition after filling on site . 58
8 Guide to the selection of switchgear and controlgear . 58
8.101 General . 58
8.102 Selection of rated values . 59
8.103 Selection of design and construction . 59
8.103.1 General . 59
8.103.2 Architecture and accessibility to high-voltage compartments . 60
8.103.3 Service continuity of the switchgear and controlgear. 60
8.103.4 Partition classes . 63
8.104 Internal arc fault . 63
8.104.1 General . 63
8.104.2 Causes and preventive measures . 63
8.104.3 Supplementary protective measures . 63
8.104.4 Considerations for the selection and installation . 64
8.104.5 Internal arc test . 65
8.104.6 IAC classification . 65
8.105 Summary of technical requirements, ratings and optional tests . 66
8.106 Ratings of earthing circuits . 68

– 6 – IEC 62271-201:2014 © IEC 2014
8.107 Ratings for cable testing . 69
9 Information to be given with enquiries, tenders and orders . 69
9.1 Information with enquiries and orders . 69
9.2 Information with tenders . 70
10 Transport, storage, installation, operation and maintenance . 70
10.1 Conditions during transport, storage and installation . 70
10.2 Installation . 70
10.2.3 Mounting . 71
10.3 Operation . 71
10.4 Maintenance . 71
11 Safety . 71
11.101 Procedures . 71
11.102 Internal arc aspects . 71
12 Influence of the product on the environment . 72
Annex AA (normative) Internal arc fault – Method to verify the internal arc
classification (IAC) . 73
AA.1 Room simulation . 73
AA.2 Indicators (for assessing the thermal effects of the gases) . 75
AA.2.1 General . 75
AA.2.2 Arrangement of indicators . 75
AA.3 Tolerances for geometrical dimensions of test arrangements . 76
AA.4 Test parameters . 76
AA.4.1 General . 76
AA.4.2 Voltage . 76
AA.4.3 Current . 77
AA.4.4 Frequency . 77
AA.5 Test procedure . 77
AA.5.1 Supply circuit . 77
AA.5.2 Arc initiation . 78
Annex BB (normative) Partial discharge measurement . 84
BB.1 General . 84
BB.2 Application . 84
BB.3 Test circuits and measuring instruments . 84
BB.4 Test procedure . 85
Annex CC (informative) Regional deviations . 89
Annex DD (normative) Humidity test . 90
DD.1 General . 90
DD.2 Test procedure and test conditions . 90
DD.2.1 Test cycle and its duration . 90
DD.2.2 Generation of fog . 91
DD.2.3 High air temperature period . 91
DD.2.4 Test chamber. 91
DD.2.5 Test object . 91
DD.2.6 Test voltage and voltage supply . 92
DD.2.7 Total test duration . 92
DD.3 Test criteria and evaluation . 92
DD.3.1 Criterion during the test . 92
DD.3.2 Criterion after the test . 92

IEC 62271-201:2014 © IEC 2014 – 7 –
DD.3.3 Evaluation of the test . 92
Annex EE (informative) Protection categories . 94
EE.1 Protection category PA . 94
EE.2 Protection category PB . 95
Annex FF (informative) List of symbols and abbreviations used in IEC 62271-201 . 96
Bibliography . 97

Figure 101 – LSC1 . 62
Figure 102 – LSC2 . 62
Figure 103 – LSC2 . 62
Figure 104 – LSC2A . 62
Figure 105 – LSC2B . 62
Figure 106 – LSC2B . 62
Figure AA.1 – Mounting frame for vertical indicators . 80
Figure AA.2 – Horizontal indicator. 80
Figure AA.3 – Position of the indicators . 81
Figure AA.4 – Room simulation and indicator positioning for accessibility A, classified
rear side, functional unit of any height . 82
Figure AA.5 – Ceiling height stated from the floor or false floor level where the
switchgear is actually placed . 83
Figure BB.1 – Partial discharge test circuit (three-phase arrangement) . 87
Figure BB.2 – Partial discharge test circuit (system without earthed neutral) . 88
Figure DD.1 – Test cycle . 93
Figure DD.2 – Test chamber . 93
Figure EE.1 – Possible designs for protection category PA . 94
Figure EE.2 – Possible designs for protection category PB . 95

Table 101 – Nameplate information . 28
Table 102 – Locations, causes and examples of measures to decrease the probability
of internal arc faults . 64
Table 103 – Single phase-to-earth arc fault current depending on the network neutral
earthing . 66
Table 104 – Summary of technical requirements, ratings and optional tests for solid-
insulation enclosed switchgear . 67
Table AA.1 – Parameters for internal arc fault test according to compartment
construction . 79
Table BB.1 – Test circuits and procedures . 86

– 8 – IEC 62271-201:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 201: AC 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
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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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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 62271-201 has been prepared by subcommittee 17C: High-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
This second edition cancels and replaces the first edition, published in 2006. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) apart from updating with the second edition of IEC 62271-200 (issued in 2011), definitions,
classifications and testing procedures have been specified more precisely;
b) access to the solid-insulation enclosed switchgear and controlgear is now restricted to
authorized personnel only. This implies that “accessibility class B” (public access) has
been deleted throughout the document;

IEC 62271-201:2014 © IEC 2014 – 9 –
c) the term “protection category” has been introduced to replace the term “protection grade”
(PA, PB1 and PB2)
Th
...