|
IEC TR 62757
Edition 1.0 2015-07
TECHNICAL
REPORT
Fire prevention measures on converters for high-voltage direct current (HVDC)
systems, static var compensators (SVC) and flexible ac transmission systems
(FACTS) and their valve halls
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 [email protected]
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - /searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [email protected].
IEC TR 62757
Edition 1.0 2015-07
TECHNICAL
REPORT
Fire prevention measures on converters for high-voltage direct current (HVDC)
systems, static var compensators (SVC) and flexible ac transmission systems
(FACTS) and their valve halls
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.20 ISBN 978-2-8322-2788-6
– 2 – IEC TR 62757:2015 © IEC 2015
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Fire hazards in valves and valve halls . 13
4.1 General . 13
4.2 Possible causes . 13
4.2.1 Valve insulation failure . 13
4.2.2 Loose connections or high resistance joints in the power circuit. 13
4.2.3 Valve component failures . 14
4.2.4 Semiconductor device level connections . 15
4.2.5 Coolant system problems. 16
4.2.6 Failure of valve hall bushings . 17
4.2.7 Failure of surge arresters . 17
4.2.8 False operation of deluge system . 17
4.2.9 Other valve hall equipment . 17
4.2.10 Work in and around valve hall . 17
4.3 Assessment of possible consequences . 18
5 Valve hall layout and access. 18
5.1 Physical arrangements . 18
5.1.1 General . 18
5.1.2 Present practices . 19
5.1.3 Specific provisions . 19
5.2 HVDC valve hall construction . 19
5.2.1 General . 19
5.2.2 Valve hall construction . 20
5.3 Means of egress . 20
6 Supervision of valve components and other valve hall equipment . 20
6.1 General . 20
6.2 Supervision of valve components . 21
6.2.1 General . 21
6.2.2 On-line monitoring . 21
6.2.3 Off-line checks and inspection . 22
6.3 Supervision of other valve hall equipment . 22
7 Fire detection systems . 23
7.1 General . 23
7.2 Detection and operating principles . 23
7.2.1 General . 23
7.2.2 Air sampling systems . 23
7.2.3 Infra-red beam smoke detectors . 23
7.2.4 Arc detector systems . 24
7.2.5 Infra-red flame detectors. 24
7.2.6 Ultraviolet (UV) flame detectors . 24
7.2.7 Imaging video camera systems . 24
7.3 Guidelines for valve hall fire detection. 24
8 Fire suppression systems . 24
8.1 General . 24
8.2 Design considerations for an installed fire suppression system . 25
8.3 Types of fire extinguishing agents . 26
8.3.1 List of agents . 26
8.3.2 Carbon dioxide . 26
8.3.3 Inert gases . 26
8.3.4 Hydro fluorocarbons . 26
8.3.5 Other gases . 27
8.4 Installation requirements . 27
8.5 Guidelines for fire extinguishing agents . 27
9 Vent management . 28
9.1 General . 28
9.2 Design considerations . 29
9.2.1 General . 29
9.2.2 Natural ventilation . 29
9.2.3 Forced ventilation . 30
9.2.4 Design . 30
10 Control and integration of fire detection, fire protection and converter control
systems . 30
10.1 General . 30
10.2 Fire alarm classification . 31
10.2.1 General . 31
10.2.2 Classification by detection principle . 32
10.2.3 Classification by detection objective . 32
10.2.4 Detection system reliability . 33
10.3 Fire control system . 33
10.3.1 General . 33
10.3.2 Basic system functions . 33
10.3.3 Other system components . 34
10.3.4 Outline of system design . 34
10.4 Guidelines for integrated fire control systems . 35
11 Fire fighting and maintenance . 35
11.1 General . 35
11.2 Role of station and fire fighting personnel . 35
11.2.1 General . 35
11.2.2 Actions in case of a fire . 35
11.2.3 Fire fighting . 36
12 Guidance for purchaser specifications . 36
12.1 General . 36
12.2 Purchaser specification . 36
12.2.1 General . 36
12.2.2 Semiconductor valves . 37
12.2.3 Other valve hall equipment . 38
12.2.4 Valve hall construction . 38
12.2.5 Fire detection systems . 38
12.2.6 Fire suppression systems . 39
12.2.7 Vent management syst
...