IEC TR 62757:2015

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

IEC TR 62757:2015

Name:IEC TR 62757:2015   Standard name: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
Standard number:IEC TR 62757:2015   language:English language
Release Date:03-Jul-2019   technical committee:SC 22F - Power electronics for electrical transmission and distribution systems
Drafting committee:JMT 4 - TC 22/SC 22F/JMT 4   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

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




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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
...

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