EN 62271-201:2006

SLOVENSKI STANDARD
01-december-2007
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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 (IEC 62271-
201:2006)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 201: Isolierstoffgekapselte
Wechselstrom-Schaltanlagen für Bemessungsspannungen über 1 kV bis einschließlich
52 kV (IEC 62271-201:2006)
Appareillage a haute tension - Partie 201: Appareillage sous enveloppe isolante pour
courant alternatif de tensions assignées supérieures a 1 kV et inférieures ou égales a 52
kV (IEC 62271-201:2006)
Ta slovenski standard je istoveten z: EN 62271-201:2006
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
October 2006
EUROPÄISCHE NORM
ICS 29.130.10 Incorporates Corrigendum November 2006

English version
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
(IEC 62271-201:2006)
Appareillage à haute tension  Hochspannungs-Schaltgeräte und
Partie 201: Appareillage sous enveloppe -Schaltanlagen
isolante pour courant alternatif Teil 201: Isolierstoffgekapselte
de tensions assignées supérieures à 1 kV Wechselstrom-Schaltanlagen
et inférieures ou égales à 52 kV für Bemessungsspannungen
(CEI 62271-201:2006) über 1 kV bis einschließlich 52 kV
(IEC 62271-201:2006)
This European Standard was approved by CENELEC on 2006-10-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

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

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

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

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62271-201:2006 E
Foreword
The text of document 17C/374/FDIS, future edition 1 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 was approved by CENELEC as EN 62271-201 on
2006-10-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2007-07-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-10-01
with the EN have to be withdrawn
This standard should be read in conjunction with EN 60694:1996 + A1:2000 + A2:2001, 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 EN 60694. Amendments to
these clauses and subclauses are given under the same numbering, whilst additional subclauses are
numbered from 101.
Annexes ZA and ZB have been added by CENELEC.
The contents of the corrigendum of November 2006 have been included in this copy.
__________
Endorsement notice
The text of the International Standard IEC 62271-201:2006 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 62271-200 NOTE  Harmonized as EN 62271-200:2004 (not modified).
__________
- 3 - EN 62271-201:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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

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

IEC 60050-151 1978 International Electrotechnical Vocabulary - -
(IEV)
Part 151: Electrical and magnetic devices

IEC 60050-441 1984 International Electrotechnical Vocabulary - -
(IEV)
Chapter 441: Switchgear, controlgear and
fuses
IEC 60060-1 1989 High-voltage test techniques
+ corr. March 1990 Part 1: General definitions and test HD 588.1 S1 1991
requirements
IEC 60243-1 1998 Electrical strength of insulating materials - EN 60243-1 1998
Test methods
Part 1: Tests at power frequencies

IEC 60265-1 1998 High-voltage switches EN 60265-1 1998
Part 1: Switches for rated voltages above
1 kV and less than 52 kV
IEC 60270 2000 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
IEC 60470 2000 High-voltage alternating current contactors - -
and contactor-based motor-starters

IEC 60480 2004 Guidelines for the checking and treatment of EN 60480 2004
sulphur hexafluoride (SF6) taken from
electrical equipment and specification for its
re-use
IEC 60529 1989 Degrees of protection provided by enclosures EN 60529 1991
(IP Code) + corr. May 1993
IEC 60694 1996 Common specifications for high-voltage EN 60694 1996
switchgear and controlgear standards + corr. May 1999
A1 2000 A1 2000
A2 2001 A2 2001
IEC 60909-0 2001 Short-circuit currents in three-phase a.c. EN 60909-0 2001
systems
Part 0: Calculation of currents

Publication Year Title EN/HD Year
IEC/TS 60932 1988 Additional requirements for enclosed - -
switchgear and controlgear from 1 kV to
72.5 kV to be used in severe climatic
conditions
IEC 62271-100 2001 High-voltage switchgear and controlgear EN 62271-100 2001
Part 100: High-voltage alternating-current
circuit-breakers
IEC 62271-102 2001 High-voltage switchgear and controlgear
+ corr. April 2002 Part 102: Alternating current disconnectors EN 62271-102 2002
corr. May 2003 and earthing switches + corr. March 2005

IEC 62271-105 2002 High-voltage switchgear and controlgear EN 62271-105 2003
Part 105: Alternating current switch-fuse
combinations
ISO/IEC Guide 51 1999 Safety aspects - Guidelines for their inclusion - -
in standards
- 5 - EN 62271-201:2006
Annex ZB
(informative)
A-deviations
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the
competence of the CENELEC national member.
This European Standard does not fall under any Directive of the EC.
In the relevant CENELEC countries these A-deviations are valid instead of the provisions of the European
Standard until they have been removed.
Clause Deviation
General Sweden (ELSÄK-FS 2004:1)
Only switchgear of class PB 2 of this standard is allowed.
1.1 Italy (Italian pressure vessel code for electrical switchgear DM 1 December 1980 and
DM 10 September 1981, published in Gazzetta Ufficiale n^ 285 dated 16.10.1981).
For insulation-enclosed switchgear and controlgear containing gas-filled compartments, the design
pressure is limited to a maximum of 0,5 bar (gauge) and the volume is limited to a maximum of
2 m . Gas filled compartments having a design pressure exceeding 0,5 bar (gauge) or a volume
exceeding 2 m shall be designed according to Italian pressure vessel code for electrical switchgear
__________
NORME CEI
INTERNATIONALE
IEC
62271-201
INTERNATIONAL
Première édition
STANDARD
First edition
2006-06
Appareillage à haute tension –
Partie 201:
Appareillage sous enveloppe isolante
pour courant alternatif de tensions assignées
supérieures à 1 kV et inférieures ou égales
à 52 kV
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
 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
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МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

62271-201  IEC:2006 – 3 –
CONTENTS
FOREWORD.9

1 General .13
1.1 Scope .13
1.2 Normative references.13
2 Normal and special service conditions .15
3 Terms and definitions .15
4 Ratings.29
4.1 Rated voltage (U ) .29
r
4.2 Rated insulation level.29
4.3 Rated frequency (f ).29
r
4.4 Rated normal current and temperature rise.31
4.5 Rated short-time withstand current (I ) .31
k
4.6 Rated peak withstand current (I ) .31
p
4.7 Rated duration of short circuit (t ) .31
k
4.8 Rated supply voltage of closing and opening devices and of auxiliary and
control circuits (U ).31
a
4.9 Rated supply frequency of operating devices and of auxiliary and control
circuits.33
4.10 Rated pressure of compressed gas supply for insulation and/or operation .33
5 Design and construction .33
5.1 Requirements for liquids in switchgear and controlgear .33
5.2 Requirements for gases in switchgear and controlgear .35
5.3 Earthing of switchgear and controlgear .35
5.4 Auxiliary and control equipment .37
5.5 Dependent power closing.37
5.6 Stored energy closing .37
5.7 Independent manual operation.37
5.8 Operation of releases .37
5.9 Low- and high-pressure interlocking and monitoring devices.37
5.10 Nameplates .37
5.11 Interlocking devices .41
5.12 Position indication .41
5.13 Degrees of protection by enclosures.43
5.14 Creepage distances.43
5.15 Gas and vacuum tightness.43
5.16 Liquid tightness .43
5.17 Flammability .43
5.18 Electromagnetic compatibility (EMC) .43
5.101 Internal fault.43
5.102 Insulation enclosure.45
5.103 Compartments .51
5.104 Removable parts.55
5.105 Provisions for dielectric tests on cables .57

62271-201  IEC:2006 – 5 –
6 Type tests .57
6.1 General .57
6.2 Dielectric tests.61
6.3 Radio interference voltage (r.i.v.) test .69
6.4 Measurement of the resistance of circuits .69
6.5 Temperature-rise tests.69
6.6 Short-time withstand current and peak withstand current tests.71
6.7 Verification of the protection .75
6.8 Tightness tests.77
6.9 Electromagnetic compatibility tests (EMC) .77
6.10 Additional tests on auxiliary and control circuits.77
6.101 Verification of making and breaking capacities.77
6.102 Mechanical operation tests .79
6.103 Pressure withstand test for gas-filled compartments .81
6.104 Tests to prove the protection of persons against electric shock.81
6.105 Internal arcing test.83
6.106 Thermal stability test.85
6.107 Humidity test.87
7 Routine tests .87
7.1 Dielectric tests on the main circuit .87
7.2 Tests on auxiliary and control circuits .89
7.3 Measurement of the resistance of the main circuit .89
7.4 Tightness test.89
7.5 Design and visual checks .89
7.101 Partial discharge measurement.89
7.102 Mechanical operation tests .89
7.103 Pressure tests of gas-filled compartments .91
7.104 Tests of auxiliary electrical, pneumatic and hydraulic devices.91
7.105 Tests after erection on site .91
7.106 Measurement of fluid condition after filling on site .91
8 Guide to the selection of insulation-enclosed switchgear and controlgear for service.93
8.1 Selection of rated values .93
8.2 Selection of design and construction.93
8.3 Internal arc classification.99
9 Information to be given with enquiries, tenders and orders .107
9.101 Information to be given with enquiries and orders .107
9.102 Information to be given with tenders .109
10 Rules for transport, storage, erection and maintenance .111
10.1 Conditions during transport, storage and erection.111
10.2 Installation.111
10.3 Operation .111
10.4 Maintenance.111
11 Safety.113
11.101 Procedures .113
11.102 Internal arc aspects .113
12 Influence of the product on the environment .113

62271-201  IEC:2006 – 7 –
Annex A (normative) Internal fault – Method for testing the insulation-enclosed
switchgear and controlgear under conditions of arcing due to an internal fault .115
Annex B (normative) Partial discharge measurement .145
Annex C (normative) Humidity test.155
Annex D (informative) Protection grades.163

Figure A.1 – Mounting frame for vertical indicators .135
Figure A.2 – Horizontal indicator.135
Figure A.3 – Position of indicators (i) Height of equipment (h).137
Figure A.4 – Room simulation and indicator positioning for accessibility A,
functional unit at or above 1,5 m .139
Figure A.5 – Room simulation and Indicator positioning for accessibility B,
functional unit above 2m high .141
Figure A.6 – Room simulation and indicator positioning for accessibility B,
functional unit below 2 m high.143
Figure B.1 – Partial discharge test circuit (three-phase arrangement) .151
Figure B.2 – Partial discharge test circuit (system without earthed neutral).153
Figure C.1 – Test cycle .161
Figure C.2 – Test chamber .161
Figure D.1 – Possible designs for protection grade PA.163
Figure D.2 – Possible designs for protection grade PB Bibliography .165

Table 1 – Nameplate information .39
Table 8.1 – Locations, causes and examples of measures to decrease the probability
of internal faults.101
Table 8.2 – Summary of technical requirements, ratings and optional tests for
insulation-enclosed switchgear .103
Table B.1 – Test circuits and procedures .149

62271-201  IEC:2006 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62271-201 has been prepared by subcommittee 17C: High-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
This standard should be read in conjunction with IEC 60694, second edition, published in
1996, its Amendment 1 (2000) and its Amendment 2 (2001), 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 60694.
Amendments to these clauses and subclauses are given under the same numbering, whilst
additional subclauses are numbered from 101.

62271-201  IEC:2006 – 11 –
This standard cancels and replaces the IEC 60466, second edition, published in 1987 and its
Amendment 1, published in 1994.
The text of this standard is based on the following documents:
FDIS Report on voting
17C/374/FDIS 17C/378/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62271-201  IEC:2006 – 13 –
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
1 General
1.1 Scope
This part of IEC 62271 specifies requirements for factory-assembled 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.
Insulation-enclosed switchgear and controlgear complying with this standard can, in principle,
be safely touched.
Insulation-enclosed switchgear and controlgear for special use, for example, in flammable
atmospheres, in mines or on board ships, may be subject to additional requirements.
Components contained in insulation-enclosed switchgear and controlgear should be designed
and tested in accordance with their various relevant standards. This standard supplements
the standards for the individual components regarding their installation in switchgear and
controlgear assemblies.
This standard does not preclude that other equipment may be included in the same enclosure.
In such a case, any possible influence of that equipment on the switchgear and controlgear
should be taken into account.
NOTE Switchgear and controlgear assemblies having a metal enclosure are covered by IEC 62271-200.
1.2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60050-151:1978, International Electrotechnical Vocabulary (IEV) – Electrical and
magnetic devices
IEC 60050-441:1984, International Electrotechnical Vocabulary (IEV) – Switchgear, control-
gear and fuses
IEC 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60243-1:1998, Electrical strength of insulating materials – Test methods – Part 1: Tests
at power frequencies
IEC 60265-1:1998, High-voltage switches – Part 1: Switches for rated voltages above 1 kV
and less than 52 kV
62271-201  IEC:2006 – 15 –
IEC 60270:2000, Partial discharge measurements
IEC 60470:2000, High-voltage alternating current contactors and contactor-based motor-
starters
IEC 60480:2004, Guidelines for the checking and treatment of sulfur hexafluoride (SF6) taken
from electrical equipment and specification for its re-use
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60694:1996, Common specifications for high-voltage switchgear and controlgear
standards
Amendment 1 (2000)
Amendment 2 (2001)
IEC 60909-0:2001, Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of
currents
IEC 60932:1988, Additional requirements for enclosed switchgear and controlgear from 1 kV
to 72,.5 kV to be used in severe climatic conditions
IEC 62271-100:2001, High-voltage switchgear and controlgear – Part 100: High-voltage
alternating-current circuit-breakers (formerly IEC 60056)
IEC 62271-102:2002, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches (formerly IEC 60129)
IEC 62271-105:2002, High-voltage switchgear and controlgear – Part 105: Alternating current
switch-fuse combinations (formerly IEC 60420)
ISO/IEC Guide 51:1999, Safety aspects – Guidelines for their inclusion in standards
2 Normal and special service conditions
Clause 2 of IEC 60694 is applicable with the following addition:
Unless otherwise specified in this standard, the insulation-enclosed switchgear and
controlgear is designed to be used under normal indoor service conditions.
NOTE If the ambient temperature exceeds the value for normal service conditions, derating may be necessary,
and testing conditions may be considered.
3 Terms and definitions
For the purposes of this document, the following terms and definitions, as well as the
definitions of IEC 60050(441), IEC 60050(151) and IEC 60694 apply, except where indicated.
Some standard definitions are recalled here for ease of reference.
Additional definitions are classified so as to be aligned with the classification system used in
IEC 60050(441).
___________
A consolidated edition is available (2002).

62271-201  IEC:2006 – 17 –
3.101
switchgear and controlgear
general term covering switching devices and their combination with associated control,
measuring, protective and regulating equipment, also assemblies of such devices and
equipment with associated interconnections, accessories, enclosures and supporting
structures
[IEV 441-11-01]
3.102
assembly (of switchgear and controlgear)
combination of switchgear and/or controlgear completely assembled with all internal electrical
and mechanical interconnections
[IEV 441-12-01]
3.103
insulation-enclosed switchgear and controlgear
switchgear and controlgear assemblies with an external insulation enclosure and completely
assembled, except for external connections
[IEV 441-12-06, modified]
NOTE The external insulation may be supplied with a (semi-)conducting layer.
3.104
functional unit (of an assembly)
part of insulation-enclosed switchgear and controlgear comprising all the components of the
main circuits and auxiliary circuits that contribute to the fulfilment of a single function
[IEV 441-13-04, modified]
NOTE Functional units may be distinguished according to the function for which they are intended, for example,
incoming unit, outgoing unit, etc.
3.105
transport unit
part of insulation-enclosed switchgear and controlgear suitable for shipment without being
dismantled
3.106
insulation enclosure
part of insulation-enclosed switchgear and controlgear providing a specified degree of
protection of equipment against external influences and a specified degree of protection
against electric shock by limiting the approach to or contact with live parts and against contact
with moving parts.
The main material of the enclosure is of insulating type, and, in the case of added conductive
layers, the resistance between any point of the conductive layer to the earthing point provided
may be more than 100 mΩ
[IEV 441-13-01, modified]
NOTE If the resistance of the enclosure of the switchgear and controlgear to the earthing point provided is
everywhere less than, or equal to, 100 mΩ, IEC 62271-200 is applicable.
3.107
compartment
part of insulation-enclosed switchgear and controlgear enclosed except for openings
necessary for interconnection, control or ventilation
[IEV 441-13-05, modified]
62271-201  IEC:2006 – 19 –
NOTE 1 Four types of compartments are distinguished: three that can be opened, called accessible (see
3.107.1/2/3), and one that cannot be opened, called non-accessible (see 3.107.4).
NOTE 2 Compartments are identified according to the main component(s) contained therein, refer to 5.103.1.
3.107.1
interlock-controlled accessible compartment
compartment containing high-voltage parts, intended to be opened for normal operation
and/or normal maintenance as stated by the manufacturer, in which access is controlled by
integral design of the switchgear and controlgear
NOTE Installation, extension, repairing, etc. are not considered as normal maintenance.
3.107.2
procedure-based accessible compartment
compartment containing high-voltage parts, intended to be opened for normal operation
and/or normal maintenance as stated by the manufacturer, in which access is controlled by a
suitable procedure combined with locking
NOTE Installation, extension, repairing, etc. are not considered as normal maintenance.
3.107.3
tool-based accessible compartment
compartment containing high-voltage parts that may be opened, but not for normal operation
and maintenance. Special procedures are required. Tools are necessary for opening
3.107.4
non-accessible compartment
compartment containing high-voltage parts, that must not be opened. Opening may destroy
the integrity of the compartment. Clear indication not to open is provided on/by the
compartment
NOTE An insulation embedded component, as defined in 3.114, can generally be qualified as a ‘non-accessible
compartment’.
3.108
partition
part of insulation-enclosed switchgear and controlgear separating one compartment from
other compartments
[IEV 441-13-06, modified]
3.109
partition class PI
insulation-enclosed switchgear and controlgear having one or more non-metallic partitions or
shutters between opened accessible compartments and live parts of the main circuit
3.110
shutter
part of insulation-enclosed switchgear and controlgear that can be moved from a position
where it permits contacts of a removable part, or moving contact of a disconnector, to engage
fixed contacts, to a position where it becomes a part of the insulation enclosure or partition
shielding the fixed contacts
[IEV 441-13-07, modified]
3.111
segregation (of conductors)
arrangement of conductors with earthed metal interposed between them in such a manner
that disruptive discharges can only occur to earth

62271-201  IEC:2006 – 21 –
[IEV 441-11-11]
NOTE A segregation may be established between the conductors as well as between the open contacts of a
switching device or disconnector.
3.112
bushing
structure carrying one or more conductors through an enclosure or partition and insulating it
therefrom, including the means of attachment
3.113
component
essential part of the main or earthing circuits of insulation-enclosed switchgear and
controlgear which serves a specific function (for example, circuit-breaker, disconnector,
switch, fuse, instrument transformer, bushing, busbar)
3.114
insulation-embedded component
component, the live parts of which are integrally surrounded by solid insulation, with the
exception of the terminals, interfaces for driving mechanisms and secondary wiring
NOTE The insulation may form part of the insulation enclosure.
3.115
main circuit (of an assembly)
all the conductive parts of insulation-enclosed switchgear and controlgear included in a circuit
which is intended to transmit electrical energy
[IEV 441-13-02, modified]
NOTE Connections to voltage transformers are not considered part of the main circuit.
3.116
earthing circuit
connection of each earthing device, or points provided for earthing purposes, to the terminal
intended to be connected to the earthing system of the installation
3.117
auxiliary circuit (of an assembly)
all the conductive parts of insulation-enclosed switchgear and controlgear included in a circuit
(other than the main circuit) intended to control, measure, signal and regulate
[IEV 441-13-03, modified]
NOTE The auxiliary circuits of insulation-enclosed switchgear and controlgear include the control and auxiliary
circuits of the switching devices.
3.118
pressure-relief device
device intended to limit the pressure in a fluid-filled compartment
3.119
fluid-filled compartment
compartment of insulation-enclosed switchgear and controlgear filled with a fluid, either gas,
other than ambient air, or liquid, for insulation purposes

62271-201  IEC:2006 – 23 –
3.119.1
gas-filled compartment
NOTE Refer to 3.6.5.1 of IEC 60694.
3.119.2
liquid-filled compartment
compartment of insulation-enclosed switchgear and controlgear in which the liquid is at
atmospheric pressure, or under pressure that is maintained by one of the following systems:
a) Controlled pressure system
b) Closed pressure system
c) Sealed pressure system
NOTE For pressure systems, refer to 3.6.4 of IEC 60694.
3.120
relative pressure
pressure, referred to the standard atmospheric pressure of 101,3 kPa
3.121
minimum functional level (of fluid-filled compartments)
gas pressure (relative pressure) in Pa (or density) or liquid mass at and above which the rated
values of the insulation-enclosed switchgear and controlgear are maintained
3.122
design level (of fluid-filled compartments)
gas pressure (relative pressure) in Pa (or density) or liquid mass used to determine the
design of a gas-filled compartment or mass for a liquid-filled compartment
3.123
design temperature (of fluid-filled compartments)
highest temperature which can be reached by the gas or liquid under service conditions
3.124
ambient air temperature (of insulation-enclosed switchgear and controlgear)
temperature, determined under prescribed conditions, of the air surrounding the enclosure of
insulation-enclosed switchgear and controlgear
3.125
removable part
part of insulation-enclosed switchgear and controlgear connected to the main circuit and that
may be removed entirely from the insulation-enclosed switchgear and controlgear and
replaced, even though the main circuit of the functional unit is energized
[IEV 441-13-08, modified]
3.126
withdrawable part
removable part of insulation-enclosed switchgear and controlgear that can be moved to
positions in which an isolating distance or segregation between open contacts is established,
while the part remains mechanically attached to the enclosure
[IEV 441-13-09, modified]
62271-201  IEC:2006 – 25 –
3.127
service position (connected position ) (of a removable part)
position of a removable part in which it is fully connected for its intended function
[IEV 441-16-25]
3.128
earthing position (of a removable part)
position of a removable part or state of a disconnector in which the closing of a mechanical
switching device causes a main circuit to be short-circuited and earthed
[IEV 441-16-26, modified]
3.129
test position (of a withdrawable part)
position of a withdrawable part in which an isolating distance or segregation is established in
the main circuit and in which the auxiliary circuits are connected
[IEV 441-16-27]
3.130
disconnected position (of a withdrawable part)
position of a withdrawable part in which an isolating distance or segregation is established in
the circuits of the withdrawable part, that part remaining mechanically attached to the
enclosure
[IEV 441-16-28, modified]
NOTE In high-voltage insulation-enclosed switchgear and controlgear, the auxiliary circuits may not be
disconnected.
3.131
removed position (of a removable part)
position of a removable part when it is outside and mechanically and electrically separated
from the enclosure
[IEV 441-16-29, modified]
3.132
loss of service continuity category
LSC
category defining the possibility to keep other compartments and/or functional units energized
when opening a main circuit compartment
NOTE 1 The LSC category describes the extent to which the switchgear and controlgear are intended to remain
operational in case access to a main-circuit compartment is necessary. The extent to which it is considered
necessary to open main-circuit compartments with a live installation might be dependent on several aspects (refer
to 8.2).
NOTE 2 The LSC category does not describe ranks of reliability of switchgear and controlgear (refer to 8.2).
3.132.1
category LSC2 switchgear and controlgear
switchgear and controlgear having accessible compartments other than the busbar
compartment of a single busbar switchgear and controlgear.
For insulation-enclosed switchgear and controlgear, wh
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