Specifications for the re-use of sulphur hexafluoride (SF6) and its mixtures in electrical equipment

This document provides criteria for the re-use of sulphur hexafluoride (SF6) and its mixtures after recovery and reclaiming from electrical equipment (e.g. for maintenance, at the end-oflife). Sulphur hexafluoride (SF6), nitrogen (N2) and carbon tetrafluoride (CF4), are gases commonly used for electrical equipment. Taking into account environmental concerns, particular attention is paid to re-use criteria for SF6 and its mixtures with N2 and CF4 for its use in electrical equipment. Procedures for recovering and reclaiming used SF6 and its mixtures are outside the scope of this document and are described in IEC 62271-4. This document provides several annexes on the description of the different methods of analysis, on by-products, on the procedure for evaluating the potential health effects from byproducts, on cryogenic reclaiming of SF6, and on reclaiming recommendations. Storage, transportation and disposal of SF6 and its mixtures are outside the scope of this document and are covered by IEC 62271-4. Procedures to determine SF6 leakages are described in IEC 60068-2-17 [4]1. For the purposes of this document, the complementary gases used in SF6 mixtures will be limited to N2 or CF4.

Spezifikationen für die Wiederverwendung von Schwefelhexafluorid (SF6) und seinen Mischungen in elektrischen Betriebsmitteln

Spécifications pour la réutilisation de l’hexafluorure de soufre (SF6) et des mélanges contenant du SF6 dans le matériel électrique

Le présent document spécifie des critères de réutilisation de l’hexafluorure de soufre (SF6) et des mélanges contenant du SF6 après reprise et régénération depuis le matériel électrique(par exemple, pour la maintenance ou en fin de vie). L’hexafluorure de soufre (SF6), l’azote (N2) et le tétrafluorure de carbone (CF4) sont des gaz communément utilisés pour le matériel électrique. Une attention particulière est accordée aux critères de réutilisation du SF6 et de ses mélanges avec N2 et CF4 pour leur utilisation dans le matériel électrique, afin de prendre en compte les aspects d’environnement. Les procédures de reprise et de régénération du SF6 usagé et des mélanges contenant du SF6 usagé ne relèvent pas du domaine d’application du présent document. Elles sont décrites dans l’IEC 62271-4. Le présent document comprend plusieurs annexes qui décrivent les différentes méthodes d’analyse, traitent des sous-produits, de la procédure d’évaluation des effets potentiels des sous-produits sur la santé, de la régénération cryogénique du SF6 et donnent des recommandations relatives à la régénération. Les procédures de stockage, de transport et d’élimination du SF6 et des mélanges contenant du SF6 ne relèvent pas du domaine d’application du présent document. Elles sont décrites dans l’IEC 62271-4. Les procédures de détermination des fuites de SF6 sont décrites dans l’IEC 60068-2-17 [4]1. Pour les besoins du présent document, les gaz complémentaires utilisés dans les mélanges du SF6 sont limités à l’azote (N2) ou au tétrafluorure de carbone (CF4).

Specifikacija za ponovno uporabo žveplovega heksafluorida(SF6) in njegovih mešanic v električni opremi

Ta dokument vsebuje merila za ponovno uporabo žveplovega heksafluorida (SF6) in njegovih mešanic po predelavi in ponovnem pridobivanju iz električne opreme (npr. za vzdrževanje, ob koncu življenjske dobe). Žveplov heksafluorid (SF6), dušik (N2) in ogljikov tetrafluorid (CF4) so plini, ki se običajno uporabljajo za električno opremo. Ob upoštevanju okoljskih vprašanj je posebna pozornost namenjena kriterijem ponovne uporabe SF6 in njegovih mešanic z N2 in CF4 za njegovo uporabo v električni opremi. Postopki za predelavo in ponovno pridobivanje uporabljenega SF6 in njegovih mešanic ne spadajo na področje uporabe tega dokumenta in so opisani v standardu IEC 62271-4.
Ta dokument vsebuje več dodatkov o opisu različnih metod analize, stranskih proizvodih, postopku ocenjevanja možnih vplivov na zdravje iz stranskih proizvodov, kriogenem ponovnem pridobivanju SF6 in priporočilih za ponovno pridobivanje.
Shranjevanje, prevoz in odstranjevanje SF6 ter njegovih mešanic ne spadajo na področje uporabe tega dokumenta in so opisani v standardu IEC 62271-4. Postopki za določanje puščanja SF6 so opisani v standardu IEC 60068-2-17 [4]1.
V tem dokumentu so plini, uporabljeni v mešanicah SF6, omejeni na N2 ali CF4.

General Information

Status
Published
Publication Date
23-May-2019
Current Stage
6060 - Document made available
Due Date
24-May-2019
Completion Date
24-May-2019

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SLOVENSKI STANDARD
SIST EN IEC 60480:2019
01-september-2019
Nadomešča:
SIST EN 60480:2005
Specifikacija za ponovno uporabo žveplovega heksafluorida(SF6) in njegovih
mešanic v električni opremi
Specification for re-use of SF6 and its mixtures in electrical equipment
Ta slovenski standard je istoveten z: EN IEC 60480:2019
ICS:
29.040.20 Izolacijski plini Insulating gases
SIST EN IEC 60480:2019 en

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

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SIST EN IEC 60480:2019
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SIST EN IEC 60480:2019
EUROPEAN STANDARD EN IEC 60480
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2019
ICS 29.130.01; 29.040.20 Supersedes EN 60480:2004
English Version
Specifications for the re-use of sulphur hexafluoride (SF ) and its
mixtures in electrical equipment
(IEC 60480:2019)

Spécifications pour la réutilisation de l'hexafluorure de Spezifikationen für die Wiederverwendung von

soufre (SF ) et des mélanges contenant du SF dans le Schwefelhexafluorid (SF ) und seinen Mischungen in

6 6 6
matériel électrique elektrischen Betriebsmitteln
(IEC 60480:2019) (IEC 60480:2019)

This European Standard was approved by CENELEC on 2019-05-09. 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, 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. EN IEC 60480:2019 E
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SIST EN IEC 60480:2019
EN IEC 60480:2019 (E)
European foreword

The text of document 10/1075/FDIS, future edition 3 of IEC 60480, prepared by IEC/TC 10 "Fluids for

electrotechnical applications" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 60480:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-02-09

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-05-09

document have to be withdrawn
This document supersedes EN 60480:2004.

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 60480:2019 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 60079-29-2 NOTE Harmonized as EN 60079-29-2
IEC 62271-203 NOTE Harmonized as EN 62271-203
IEC 60376 NOTE Harmonized as EN IEC 60376
IEC 60068-2-17 NOTE Harmonized as EN 60068-2-17
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SIST EN IEC 60480:2019
EN IEC 60480:2019 (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 60050-192 - International electrotechnical vocabulary - Part 192: - -
Dependability
IEC 60050-212 - International Electrotechnical Vocabulary - Part 212: - -
Electrical insulating solids, liquids and gases
IEC 60050-441 - International Electrotechnical Vocabulary. - -
Switchgear, controlgear and fuses
IEC 60050-826 - International Electrotechnical Vocabulary - Part 826: - -
Electrical installations

IEC 62271-4 2013 High-voltage switchgear and controlgear - Part 4: EN 62271-4 2013

Handling procedures for sulphur hexafluoride (SF6)
and its mixtures
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SIST EN IEC 60480:2019
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SIST EN IEC 60480:2019
IEC 60480
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specifications for the re-use of sulphur hexafluoride (SF ) and its mixtures
in electrical equipment
Spécifications pour la réutilisation de l’hexafluorure de soufre (SF )
et des mélanges contenant du SF dans le matériel électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.040.20; 29.130.01 ISBN 978-2-8322-6697-7

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 EN IEC 60480:2019
– 2 – IEC 60480:2019 © IEC 2019
CONTENTS

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

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

2 Normative references ...................................................................................................... 7

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

4 Contaminants and their sources ...................................................................................... 9

4.1 General ................................................................................................................... 9

4.2 Contaminants from handling and use ...................................................................... 9

4.3 SF by-products in equipment that only have an insulating function ........................ 9

4.4 SF by-products in switching equipment ............................................................... 10

4.5 SF by-products from internal arcs ....................................................................... 10

4.6 SF mixtures specific by-products ......................................................................... 10

5 Specifications for re-use of SF ..................................................................................... 10

6 Specifications for re-use of SF mixtures ....................................................................... 11

7 Reclaiming of SF and SF mixtures ............................................................................. 11

6 6

7.1 Feasibility and process ......................................................................................... 11

7.2 Detection techniques for checking the quality of the gases.................................... 14

7.2.1 General ......................................................................................................... 14

7.2.2 On-site analysis ............................................................................................. 14

7.2.3 Laboratory analysis ....................................................................................... 15

8 Handling, storage and transportation (informative) ......................................................... 16

9 Safety and first aid ........................................................................................................ 16

9.1 General safety rules .............................................................................................. 16

9.1.1 General ......................................................................................................... 16

9.1.2 Protection of personnel .................................................................................. 17

9.1.3 Handling of contaminated safety equipment and tools .................................... 18

9.1.4 Pressurized equipment and tools or measuring devices ................................. 19

9.1.5 Personal safety and protective equipment ...................................................... 19

9.1.6 Facilities and services ................................................................................... 20

9.2 Additional safety measures in case of abnormal release of SF due to

external fire or internal arc fault ............................................................................ 20

9.3 First aid equipment and treatment ......................................................................... 21

9.3.1 General ......................................................................................................... 21

9.3.2 Irritation of the skin ........................................................................................ 21

9.3.3 Irritation of the eyes ....................................................................................... 22

9.3.4 Breathing difficulty ......................................................................................... 22

10 Environmental aspects .................................................................................................. 22

Annex A (informative) Description of methods of analysis (on-site and laboratory) ............... 23

A.1 Sampling............................................................................................................... 23

A.1.1 General ......................................................................................................... 23

A.1.2 On-site sampling connection .......................................................................... 23

A.1.3 Sample cylinder for laboratory analysis .......................................................... 23

A.1.4 Sampling methods for laboratory analysis ...................................................... 24

A.2 On-site analysis .................................................................................................... 25

A.2.1 General ......................................................................................................... 25

A.2.2 SF concentration meter ................................................................................ 25

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SIST EN IEC 60480:2019
IEC 60480:2019 © IEC 2019 – 3 –

A.2.3 Hygrometers .................................................................................................. 25

A.3 Laboratory analysis ............................................................................................... 26

A.3.1 Gas chromatography ..................................................................................... 26

A.3.2 Infrared spectroscopy .................................................................................... 28

Annex B (informative) By-products of SF6 and its mixtures ................................................... 31

B.1 Decomposition of SF and its mixtures ................................................................. 31

B.1.1 General ......................................................................................................... 31

B.1.2 Behaviour of SF in an electric arc ................................................................ 31

B.1.3 SF6 decomposition with low current discharges ............................................. 33

B.1.4 Catalytic decomposition of SF (high-temperature behaviour) ....................... 33

B.2 Corrosion behaviour of SF and its by-products .................................................... 33

B.3 Measures for the removal of by-products .............................................................. 33

B.4 Physiological characteristics of by-products .......................................................... 34

Annex C (informative) Procedures for evaluating the potential effects on health from

by-products of SF and its mixtures ...................................................................................... 35

C.1 General ................................................................................................................. 35

C.2 Formation and health effects of SF by-products .................................................. 35

C.2.1 Formation of SF by-products ........................................................................ 35

C.2.2 Effects of SF by-products on health ............................................................. 36

C.2.3 Quantitative estimation of gaseous by-products ............................................. 37

C.2.4 Procedures for health risk evaluation ............................................................. 38

C.3 Conclusion ............................................................................................................ 40

Annex D (informative) Reclaiming recommendations ............................................................ 42

D.1 General ................................................................................................................. 42

D.2 Filtering recommendations .................................................................................... 42

D.3 Transport of used SF in gas cylinders and containers by road ............................. 42

Annex E (informative) Cryogenic reclaiming of SF .............................................................. 43

E.1 General ................................................................................................................. 43

E.2 Applications .......................................................................................................... 43

E.3 Physical background ............................................................................................. 43

E.4 Cryogenic processes............................................................................................. 44

E.5 Description of a cryogenic reclaimer ..................................................................... 44

Bibliography .......................................................................................................................... 47

Figure 1 – Decision flow chart for recovered SF .................................................................. 13

Figure A.1 – One-sampling cylinder method set-up ............................................................... 24

Figure A.2 – Two-sampling cylinder method set-up ............................................................... 24

Figure A.3 – Example of a gas chromatogram in one print out showing the different

possible by-products after decomposition ............................................................................. 27

Figure A.4 – Typical GCMS chromatogram of decomposed SF /CF mixture ........................ 28

6 4

Figure A.5 – IR spectrum of contaminated SF ..................................................................... 30

Figure C.1 – Procedure for the evaluation of the potential effects on health due

to arcing ............................................................................................................................... 39

Figure C.2 – Procedure for the evaluation of the potential effects on health due to low

energy discharges ................................................................................................................ 40

Figure D.1 – Saturated vapour pressure of various gases as a function of temperature........ 43

Figure D.2 – Typical cryogenic reclaimer for SF recovery on site ........................................ 45

Figure D.3 – Typical cryogenic reclaimer for removing contaminants .................................... 45

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SIST EN IEC 60480:2019
– 4 – IEC 60480:2019 © IEC 2019

Table 1 – SF contaminants ................................................................................................... 9

Table 2 – Specifications for re-use of SF ............................................................................ 10

Table 3 – Specifications for re-use of SF /N mixtures ......................................................... 11

6 2

Table 4 – Specifications for re-use of SF /CF mixtures ....................................................... 11

6 4

Table 5 – General contaminants and methods for their removal ............................................ 12

Table 6 – Typical adsorbents for various SF contaminants .................................................. 12

Table 7 – On-site methods .................................................................................................... 15

Table 8 – Laboratory methods .............................................................................................. 16

Table 9 – Measures when working with SF electric power equipment .................................. 17

Table 10 – Safety measures when opening or accessing gas compartments ......................... 18

Table 11 – Neutralizing solutions .......................................................................................... 19

Table 12 – Additional safety measures .................................................................................. 21

Table A.1 – Peak absorption of SF and contaminants ......................................................... 29

Table C.1 – OELs for SO2, HF, and S2F10 ........................................................................... 37

Table C.2 – SOF production rate ......................................................................................... 37

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SIST EN IEC 60480:2019
IEC 60480:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATIONS FOR THE RE-USE OF SULPHUR HEXAFLUORIDE (SF )
AND ITS MIXTURES IN ELECTRICAL EQUIPMENT
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 60480 has been prepared by IEC technical committee 10: Fluids

for electrotechnical applications.

This third edition cancels and replaces the second edition, published in 2004. This edition

constitutes a technical revision.

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

edition:
• specifications for the re-use of SF have been confirmed;

• specifications for the re-use of SF mixtures, namely SF /N and SF /CF mixtures are

6 6 2 6 4
included;

• as a result of a new repartition of annexes in IEC 60376, IEC 60480 and IEC 62271-4, this

new edition now contains the following five annexes:
– Annex A: Description of methods of analysis (on-site and laboratory);
– Annex B: By–products of SF and its mixtures;
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SIST EN IEC 60480:2019
– 6 – IEC 60480:2019 © IEC 2019

– Annex C: Procedure for evaluating the potential effects on health from by-products of SF

and its mixtures;
– Annex D: Reclaiming recommendations.
– Annex E: Cryogenic reclaiming of SF ;
The text of this International Standard is based on the following documents:
FDIS Report on voting
10/1075/FDIS 10/1080/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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 IEC 60480:2019
IEC 60480:2019 © IEC 2019 – 7 –
SPECIFICATIONS FOR THE RE-USE OF SULPHUR HEXAFLUORIDE (SF )
AND ITS MIXTURES IN ELECTRICAL EQUIPMENT
1 Scope

This document provides criteria for the re-use of sulphur hexafluoride (SF ) and its mixtures

after recovery and reclaiming from electrical equipment (e.g. for maintenance, at the end-of-

life).

Sulphur hexafluoride (SF ), nitrogen (N ) and carbon tetrafluoride (CF ), are gases commonly

6 2 4

used for electrical equipment. Taking into account environmental concerns, particular

attention is paid to re-use criteria for SF and its mixtures with N and CF for its use in

6 2 4

electrical equipment. Procedures for recovering and reclaiming used SF and its mixtures are

outside the scope of this document and are described in IEC 62271-4.

This document provides several annexes on the description of the different methods of

analysis, on by-products, on the procedure for evaluating the potential health effects from by-

products, on cryogenic reclaiming of SF , and on reclaiming recommendations.

Storage, transportation and disposal of SF and its mixtures are outside the scope of this

document and are covered by IEC 62271-4. Procedures to determine SF leakages are
described in IEC 60068-2-17 [4] .
mixtures will be
For the purposes of this document, the complementary gases used in SF
limited to N or CF .
2 4
2 Normative references

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.

IEC 60050-192, International Electrotechnical Vocabulary – Part 192: Dependability (available

at http://www.electropedia.org)

IEC 60050-212, International Electrotechnical Vocabulary – Part 212: Electrical insulating

solids, liquids and gases (available at http://www.electropedia.org)

IEC 60050-441, International Electrotechnical Vocabulary – Part 441: Switchgear, controlgear

and fuses (available at http://www.electropedia.org)

IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations

(available at http://www.electropedia.org)

IEC 62271-4:2013, High-voltage switchgear and controlgear – Part 4: Handling procedures for

sulphur hexafluoride (SF ) and its mixtures
___________
Numbers in square brackets refer to the bibliography.
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SIST EN IEC 60480:2019
– 8 – IEC 60480:2019 © IEC 2019
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-192,

IEC 60050-212, IEC 60050-441 and IEC 60050-826, and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
electrical equipment

item used for such purposes as generation, conversion, transmission, distribution or utilization

of electrical energy, such as electric machines, transformers, switchgear and controlgear,

measuring instruments, protective devices, wiring systems, current-using equipment,

insulated bushings, surge arresters

[SOURCE: IEC 60050-826:2004, 826-16-01, modified – "insulated bushings, surge arresters"

has been added.]
3.2
container

vessel (cylinder) suitable for the containment of pressurized gases either in gaseous or liquid

phase, according to local and/or international safety and transportation regulations

3.3
used sulphur hexafluoride
SF which has been introduced into electrical equipment
3.4
reclaiming
process of contaminants removal from an insulating liquid or gas
3.5
recovery
process of transferring gas from electrical equipment to an alternate container
3.6
SF mixture
gas mixture formed by SF and a complementary gas, typically N or CF
6 2 4
3.7
contaminant

foreign substance or material in an insulating liquid or gas which usually has a deleterious

effect on one or more properties
[SOURCE: IEC 60050-212:2010, 212-17-27, modified – "or solid" has been deleted.]
3.8
by-products

contaminants which are formed by the degradation of SF and its mixtures by electrical arcs

or sparks
3.9
ambient air
normal atmosphere surrounding the equipment
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SIST EN IEC 60480:2019
IEC 60480:2019 © IEC 2019 – 9 –
[SOURCE: IEC 60079-29-2:2015, 3.1.1]
4 Contaminants and their sources
4.1 General
SF recovered from electrical equipment in operation
...

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