SIST EN 62271-4:2013
(Main)High-voltage switchgear and controlgear - Part 4: Handling procedures for sulphur hexafluoride (SF6)
High-voltage switchgear and controlgear - Part 4: Handling procedures for sulphur hexafluoride (SF6)
This part of IEC 62271 applies to the procedures for handling of SF6 during installation, commissioning, normal and abnormal operations, disposal at the end-of-life of high-voltage switchgear and controlgear. These procedures are regarded as minimum requirements to ensure the safety of personnel working with SF6 and to minimize the SF6 emission to the environment. This standard generally applies also to gas mixtures containing SF6. The particularities for their handling are covered in Annex J.
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 4: Handhabungsmethoden zum Umgang mit Schwefelhexafluorid (SF6)
Appareillage à haute tension - Partie 4: Procédures de manipulation de l'hexafluorure de soufre (SF6)
La CEI 62271-4:2013 s'applique aux procédures de manipulation du SF6 lors de l'installation, de la mise en service, du fonctionnement normal ou anormal, et de l'élimination en fin de vie de l'appareillage à haute tension. Cette première édition annule et remplace la première édition de la CEI/TR 62271-303 parue en 2008. Cette première édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) remplacement de la description des effets potentiels sur la santé des produits de décomposition du SF6 (anciennement Annexe D de la CEI/TR 62271-303:2008) par les méthodes de calcul pour évaluer les effets potentiels sur la santé des produits de décomposition du SF6 (voir Annexe H); b) ajout d'informations concernant la régénération cryogénique du SF6 (voir Annexe I); c) ajout de procédures de manipulation pour les mélanges contenant du SF6 les plus courants (voir Annexe J).
Visokonapetostne stikalne in krmilne naprave - 4. del: Ravnanje z žveplovim heksafluoridom (SF6) (IEC 62271-4:2013)
Ta del standarda IEC 62271 se uporablja za postopke za ravnanje z žveplovim heksafluoridom (SF6) med vgrajevanjem, zagonom, normalnim in nenormalnim delovanjem, odstranitvijo po koncu življenjske dobe visokonapetostnih stikalnih in krmilnih naprav. Ti postopki se obravnavajo kot minimalne zahteve za zagotavljanje varnosti osebja, ki dela s SF6, in čim večjo omejitev emisij SF6 v okolje. Ta standard se na splošno uporablja tudi za plinske zmesi, ki vsebujejo SF6. Posebnosti, ki veljajo za ravnanje z njimi, so obravnavane v dodatku J.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62271-4:2013
01-december-2013
1DGRPHãþD
SIST-TP CLC/TR 62271-303:2009
Visokonapetostne stikalne in krmilne naprave - 4. del: Ravnanje z žveplovim
heksafluoridom (SF6) (IEC 62271-4:2013)
High-voltage switchgear and controlgear - Part 4: Handling procedures for sulphur
hexafluoride (SF6)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 4: Handhabungsmethoden zum
Umgang mit Schwefelhexafluorid (SF6)
Appareillage à haute tension - Partie 4: Procédures de manipulation de l'hexafluorure de
soufre (SF6)
Ta slovenski standard je istoveten z: EN 62271-4:2013
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST EN 62271-4:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 62271-4:2013
---------------------- Page: 2 ----------------------
SIST EN 62271-4:2013
EUROPEAN STANDARD
EN 62271-4
NORME EUROPÉENNE
November 2013
EUROPÄISCHE NORM
ICS 29.130.10; 29.130.99 Supersedes CLC/TR 62271-303:2009
English version
High-voltage switchgear and controlgear -
Part 4: Handling procedures for sulphur hexafluoride (SF )
6
and its mixtures
(IEC 62271-4:2013)
Appareillage à haute tension - Hochspannungs-Schaltgeräte und -
Partie 4: Utilisation et manipulation de Schaltanlagen -
l'hexafluorure de soufre (SF ) et des Teil 4: Handhabungsmethoden im
6
mélanges contenant du SF Umgang mit Schwefelhexafluorid (SF )
6 6
(CEI 62271-4:2013) und seinen Mischgasen
(IEC 62271-4:2013)
This European Standard was approved by CENELEC on 2013-09-30. 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.
CENELEC
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
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62271-4:2013 E
---------------------- Page: 3 ----------------------
SIST EN 62271-4:2013
EN 62271-4:2013 - 2 -
Foreword
The text of document 17A/1044/FDIS, future edition 1 of IEC 62271-4, prepared by SC 17A
“High-voltage switchgear and controlgear” of IEC/TC 17 “Switchgear and controlgear" was submitted
to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62271-4:2013.
The following dates are fixed:
(dop) 2014-06-30
• 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) 2016-09-30
standards conflicting with the
document have to be withdrawn
This document supersedes CLC/TR 62271-303:2009.
EN 62271-4:2013 includes the following significant technical changes with respect to
CLC/TR 62271-303:2009:
a) the description of the potential effects on health of SF by-products (former Annex D of
6
CLC/TR 62271-303:2009) has been replaced by the calculation methods for evaluating of the
potential effects on health of SF by-products (see Annex H);
6
b) information about cryogenic reclaim of SF have been added (see Annex I);
6
c) handling procedures for the most popular SF mixtures have been added (see Annex J).
6
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 62271-4:2013 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 62271-203:2011 NOTE Harmonized as EN 62271-203:2012 (not modified).
ISO 14040:2006 NOTE Harmonized as EN ISO 14040:2006 (not modified).
---------------------- Page: 4 ----------------------
SIST EN 62271-4:2013
- 3 - EN 62271-4:2013
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 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 60050-441 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 441: Switchgear, controlgear and
fuses
IEC 60050-601 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 601: Generation, transmission and
distribution of electricity - General
IEC 60376 - Specification of technical grade sulfur EN 60376 -
hexafluoride (SF ) for use in electrical
6
equipment
IEC 60480 - Guidelines for the checking and treatment EN 60480 -
of sulphur hexafluoride (SF ) taken from
6
electrical equipment and specification for its
re-use
IEC 62271-1 - High-voltage switchgear and controlgear - EN 62271-1 -
Part 1: Common specifications
- - Transportable gas cylinders - Gas cylinder EN 1089-3 -
identification (excluding LPG) -
Part 3: Colour coding
---------------------- Page: 5 ----------------------
SIST EN 62271-4:2013
---------------------- Page: 6 ----------------------
SIST EN 62271-4:2013
IEC 62271-4
®
Edition 1.0 2013-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –
Part 4: Handling procedures for sulphur hexafluoride (SF ) and its mixtures
6
Appareillage à haute tension –
Partie 4: Utilisation et manipulation de l'hexafluorure de soufre (SF ) et des
6
mélanges contenant du SF
6
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XC
ICS 29.130.10; 29.130.99 ISBN 978-2-8322-1042-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 62271-4:2013
– 2 – 62271-4 © IEC:2013
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 General . 8
1.1 Scope . 8
1.2 Normative references . 8
2 Terms and definitions . 9
3 SF handling during installation and commissioning . 11
6
3.1 General . 11
3.2 Evacuation, filling and checking the SF quality after filling . 11
6
3.3 Topping-up of SF pre-filled compartments to the rated filling
6
pressure/density . 13
3.4 Filling sealed pressure systems . 15
4 SF handling during normal service life . 15
6
4.1 Re-filling of SF to the rated filling pressure/density . 15
6
4.2 Checking the SF quality . 16
6
4.2.1 General . 16
4.2.2 Measurement of the SF quality with portable equipment . 16
6
4.2.3 Sampling and shipment of SF for off-site analysis . 17
6
5 SF recovery and reclaim during maintenance . 18
6
5.1 General . 18
5.2 SF recovery and reclaim from any compartment of controlled or closed
6
pressure systems containing non-arced or normally arced SF . 18
6
5.3 Recovery and reclaim from any compartment of controlled or closed
pressure systems containing heavily arced SF . 20
6
6 Dismantling of SF electric power equipment at the end-of-life . 22
6
6.1 General . 22
6.2 End-of-life of controlled or closed pressure systems . 23
6.3 End-of-life of sealed pressure systems . 23
6.4 SF recovery and reclaim at the end-of-life of sealed pressure systems . 24
6
6.5 Dismantling of electric power equipment at the end-of-life . 26
6.6 By-products at the end-of-life . 27
Annex A (informative) Storage and transportation of SF . 29
6
Annex B (informative) Safety and first aid . 33
Annex C (informative) Training and certification . 39
Annex D (informative) Description of SF Handling Equipment . 43
6
Annex E (informative) Sulphur hexafluoride . 51
Annex F (informative) Environmental effects of SF . 55
6
Annex G (informative) SF by-products. 58
6
Annex H (informative) Procedure for evaluating the potential effects on health of SF
6
by-products . 61
Annex I (informative) Cryogenic reclaim of SF . 67
6
Annex J (normative) Handling of SF mixtures . 71
6
Bibliography . 76
Figure 1 – Evacuation, filling and checking the SF quality after filling . 12
6
---------------------- Page: 8 ----------------------
SIST EN 62271-4:2013
62271-4 © IEC:2013 – 3 –
Figure 2 – Topping-up of SF pre-filled compartments to the rated filling
6
pressure/density . 14
Figure 3 – SF re-filling to the rated filling pressure/density . 15
6
Figure 4 – Checking the SF quality on-site . 17
6
Figure 5 – SF sampling and shipment . 18
6
Figure 6 – Example of recovery and reclaim from any compartment of controlled or
closed pressure systems containing non-arced or normally arced SF . 19
6
Figure 7 – Example of recovery and reclaim from any compartment of controlled or
closed pressure systems containing heavily arced SF . 21
6
Figure 8 – End-of-life of controlled or closed pressure systems . 23
Figure 9 – End-of-life of sealed pressure systems . 24
Figure 10 – SF recovery and reclaim at the end-of-life of sealed pressure systems . 25
6
Figure 11 – Dismantling of electric power equipment . 27
Figure D.1 – General purpose reclaimer . 43
Figure D.2 – Gas mixing device . 49
Figure E.1 – Pressure/temperature/density characteristics for SF [16] . 52
6
Figure H.1 – Procedure for the evaluation of the potential effects on health due to
arcing . 65
Figure H.2 – Procedure for the evaluation of the potential effects on health due to low
energy discharges . 66
Figure I.1 – Saturated vapour pressure of various gases as a function of temperature . 68
Figure I.2 – Typical cryogenic reclaimer for SF recovery on site . 69
6
Figure I.3 – Typical cryogenic reclaimer for removing contaminants . 70
Figure J.1 – Vapour pressure of SF . 74
6
Figure J.2 – Maximum SF storage density to avoid SF liquefaction . 75
6 6
Table 1 – Evacuation, filling and checking the SF quality after filling . 13
6
Table 2 – Topping-up of SF pre-filled compartments to the rated filling
6
pressure/density. . 14
Table 3 – SF re-filling to the rated filling pressure/density . 16
6
Table 4 – Checking the SF quality on-site . 17
6
Table 5 – SF sampling and shipment . 18
6
Table 6 – Example of recovery and reclaim from any compartment of controlled or
closed pressure systems containing non-arced or normally arced SF . 20
6
Table 7 – Example of recovery and reclaim from any compartment of controlled or
closed pressure systems containing heavily arced SF . 22
6
Table 8 – SF recovery at the end-of-life of sealed pressure systems . 26
6
Table 9 – Expected SF characteristics and quantity of by-products . 28
6
Table A.1 – Methods for storage of SF . 29
6
Table A.2 – Container types and labelling required for storage and transportation of
SF . 30
6
Table A.3 – International regulations for shipment of SF . 31
6
Table B.1 – Measures when working with SF electric power equipment. 33
6
Table B.2 – Safety measures when opening or accessing gas compartments . 34
Table B.3 – Neutralising solutions . 35
Table B.4 – Additional safety measures . 37
---------------------- Page: 9 ----------------------
SIST EN 62271-4:2013
– 4 – 62271-4 © IEC:2013
Table D.1 – Typical filter types used during SF reclaim . 44
6
Table D.2 – Gas measuring devices . 47
Table E.1 – Main chemical characteristics of SF [16] . 51
6
Table E.2 – Main physical characteristics of SF [16] . 53
6
Table E.3 – Main electrical characteristics of SF [16] . 53
6
Table H.1 – OELs for SO , HF, and S F . 63
2 2 10
Table H.2 – SOF production rate . 63
2
---------------------- Page: 10 ----------------------
SIST EN 62271-4:2013
62271-4 © IEC:2013 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 4: Handling procedures for sulphur hexafluoride (SF )
6
and its mixtures
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.
International Standard IEC 62271-4 has been prepared by subcommittee 17A: High-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This first edition cancels and replaces the first edition of IEC/TR 62271-303 published in
2008.
This first edition constitutes a technical revision. This edition includes the following significant
technical changes with respect to the previous edition:
a) the description of the potential effects on health of SF by-products (former Annex D of
6
IEC/TR 62271-303:2008) has been replaced by the calculation methods for evaluating of
the potential effects on health of SF by-products (see Annex H);
6
b) information about cryogenic reclaim of SF .have been added (see Annex I);
6
c) handling procedures for the most popular SF mixtures have been added (see Annex J).
6
---------------------- Page: 11 ----------------------
SIST EN 62271-4:2013
– 6 – 62271-4 © IEC:2013
The text of this standard is based on the following documents:
FDIS Report on voting
17A/1044/FDIS 17A/1051/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.
A list of all parts in the IEC 62271, 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.
---------------------- Page: 12 ----------------------
SIST EN 62271-4:2013
62271-4 © IEC:2013 – 7 –
INTRODUCTION
As agreed with TC 10, annexes A, E, F, G, H and I will be removed from this document as
soon as the revised editions of IEC 60376 and IEC 60480 have been published.
---------------------- Page: 13 ----------------------
SIST EN 62271-4:2013
– 8 – 62271-4 © IEC:2013
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 4: Handling procedures for sulphur hexafluoride (SF )
6
and its mixtures
1 General
1.1 Scope
This part of IEC 62271 applies to the procedures for handling of SF during installation,
6
commissioning, normal and abnormal operations, disposal at the end-of-life of high-voltage
switchgear and controlgear.
These procedures are regarded as minimum requirements to ensure the safety of personnel
working with SF (see Annex B) and to minimize the SF emission to the environment.
6 6
This standard generally applies also to gas mixtures containing SF . The particularities for
6
their handling are covered in Annex J.
NOTE 1 Throughout this standard, use of the term High-Voltage (refer to IEC 60050-601:1985, 601-01-27) means
a rated voltage above 1 000 V. However the term Medium Voltage (refer to IEC 60050-601: 1985, 601-01-28) is
commonly used for distribution systems with voltages above 1 kV and generally applied up to and including 52 kV.
NOTE 2 Throughout this standard, the term “electric power equipment” stands for “high-voltage and
medium-voltage switchgear and controlgear”.
NOTE 3 Throughout this standard, the term “pressure” stands for “absolute pressure”.
1.2 Normative references
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.
IEC 60050-441, International Electrotechnical Vocabulary – Chapter 441: Switchgear,
controlgear and fuses
IEC 60050-601, International Electrotechnical Vocabulary – Chapter 601: Generation,
transmission and distribution of electricity – General
IEC 60376, Specification of technical grade sulphur hexafluoride (SF ) for use in electrical
6
equipment
IEC 60480, Guidelines for the checking and treatment of sulphur hexafluoride (SF ) taken
6
from electrical equipment and specifications for its re-use
IEC 62271-1, High-voltage switchgear and controlgear – Part 1: Common specifications
EN 1089-3, Transportable gas cylinders. Gas cylinder identification (excluding LPG). Colour
coding
---------------------- Page: 14 ----------------------
SIST EN 62271-4:2013
62271-4 © IEC:2013 – 9 –
2 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-441 and
IEC 60050-601, as well as the following apply.
2.1
abnormal release of SF
6
release from equipment in service due to a failure in the pressure system or mistake in the
handling process
Note 1 to entry: An abnormal SF leak is usually an unwanted and continuous emission of gas at a higher rate
6
than the equipment designed leak rate. As soon as an abnormal SF leak is detected, appropriate measures to
6
locate and eliminate it should be arranged.
2.2
handling of SF
6
any process which might involve transfer of SF
6
2.3
evacuation
transfer of a gas different from SF (e.g. air or N ) which can be released into the
6 2
atmosphere. The operation is performed utilising a vacuum pump
2.4
recovery of SF
6
transfer of SF from the gas compartment into a reclaimer or storage container
6
Note 1 to entry: The operation is normally performed utilising a recovery compressor.
2.5
topping-up with SF
6
filling a pre-filled compartment with SF to the rated filling pressure
6
Note 1 to entry: Pre-filled compartments are closed pressure systems filled in the factory prior to shipment. They
contain SF at a typical pressure between 0,12 MPa to 0,15 MPa allowing for a faster and easier commissioning
6
on-site.
2.6
re-filling with SF
6
to the rated filling pressure to assure continuity of service
filling a compartment with SF
6
2.7
reclaim of SF
6
a series of SF handling procedures including recovery and minimum SF refining process
6 6
such as filtering dust, by-products, moisture, oil, etc.
Note 1 to entry: A standard reclaimer is described in Annex D; while a cryogenic reclaimer is described in
Annex I.
Note 2 to entry: Sometimes the words “reclaiming” or “reclamation” may be used with the same meaning as
“reclaim”.
2.8
gas-insulated metal-enclosed switchgear
metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating
gas other than air at atmospheric pressure
Note 1 to entry: This term generally applies to high-voltage switchgear and controlgear.
[SOURCE: IEC 60050-441: 1984, 441-12-05]
---------------------- Page: 15 ----------------------
SIST EN 62271-4:2013
– 10 – 62271-4 © IEC:2013
2.9
gas-filled compartment
compartment of switchgear and controlgear in which the gas pressure is maintained by one of
the following systems:
• controlled pressure system;
• closed pressure system;
• sealed pressure system
Note 1 to entry: Several gas-filled compartments may be perma
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.