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IEC TS 62271-304
Edition 2.0 2019-03
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
High-voltage switchgear and controlgear –
Part 304: Classification of indoor enclosed switchgear and controlgear for rated
voltages above 1 kV up to and including 52 kV related to the use in special
service conditions with respect to condensation and pollution
Appareillage à haute tension –
Partie 304: Classification de l’appareillage d’intérieur sous enveloppe pour
tensions assignées supérieures à 1 kV et jusqu’à 52 kV inclus relatives à
l’utilisation dans des conditions spéciales de service en ce qui concerne la
condensation et la pollution
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IEC TS 62271-304
Edition 2.0 2019-03
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
High-voltage switchgear and controlgear –
Part 304: Classification of indoor enclosed switchgear and controlgear for rated
voltages above 1 kV up to and including 52 kV related to the use in special
service conditions with respect to condensation and pollution
Appareillage à haute tension –
Partie 304: Classification de l’appareillage d’intérieur sous enveloppe pour
tensions assignées supérieures à 1 kV et jusqu’à 52 kV inclus relatives à
l’utilisation dans des conditions spéciales de service en ce qui concerne la
condensation et la pollution
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-6674-8
– 2 – IEC TS 62271-304:2019 © IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Definition of indoor service conditions under condensation and pollution . 7
5 Classification of enclosed switchgear and controlgear . 8
6 Test procedure for classification . 8
7 Test facilities and associated requirements . 10
7.1 Climatic test room . 10
7.2 Measurement and control requirements . 10
7.3 Energizing facilities . 10
7.4 Information to be included in the test report . 10
8 Arrangement of the equipment for test . 11
9 Ageing test . 11
9.1 Level 1 ageing test . 11
9.2 Level 2 ageing test . 12
10 Electrical assessment after ageing test . 13
10.1 General . 13
10.2 Criteria to pass the tests . 14
Annex A (informative) Climatic test room . 15
Annex B (informative) Typical indoor environments . 16
B.1 General . 16
B.2 Pollution . 16
Annex C (informative) Typical precautions to improve indoor operating conditions . 20
C.1 General . 20
C.2 Precautions for operating room . 20
Annex D (informative) Mechanical assessment . 21
Annex E (informative) Pollution testing conditions, parameters, and procedure . 22
E.1 General . 22
E.2 Proposal for new classes . 22
E.3 Testing procedure . 22
E.3.1 Testing conditions . 22
E.3.2 Testing parameters . 23
E.3.3 Testing procedure . 23
Bibliography . 26
Figure 1 – Flow chart for classification testing procedure . 9
Figure 2 – Climatic conditions for ageing test for level 1 and electrical assessment . 12
Figure 3 – Power-frequency voltage test sequences with high humidity after ageing
test . 14
Figure A.1 – Climatic test room . 15
Figure E.1 – Test cycle . 24
Table B.1 – Examples of typical environments (IEC TS 60815-1, IEC 60721-3-3) . 17
Table B.2 – Concentrations of some of the most important pollutants in different types
of environments (Annex B of ISO 9223:2012 [8], IEC 60721-3-3) . 18
Table B.3 – Deposits of some of the most important pollutants in different types of
environments (Annex B of ISO 9223:2012 [8], IEC TS 60815-1, IEC 60721-3-3,
IEC 60721-2-5[7]) . 19
Table C.1 – Typical precautions to improve indoor operating conditions . 20
– 4 – IEC TS 62271-304:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 304: Classification of indoor enclosed switchgear and controlgear for
rated voltages above 1 kV up to and including 52 kV related to the use in
special service conditions with respect to condensation and pollution
FOREWORD
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