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(E), which is a technical report, deals with fire prevention measures on converters and their valve halls for high voltage direct current (HVDC) systems, static VAR compensators (SVC) and flexible AC transmission systems (FACTS). It is intended to be primarily for the use of the utilities and consultants who are responsible for issuing technical specifications for new converter valves and valve halls. It concerns fire incidents in HVDC projects using line commutated converters (LCC) or voltage sourced converter (VSC) technology and it is from these projects that most examples of fires and fire incidents are taken. This technical report also addresses converter valves and valve halls for SVC and FACTS. This technical report provides general recommendations to be considered while preparing specifications for these systems. Specific requirements for a particular project need to be clearly specified and mutually agreed upon between the supplier and the purchaser.

General Information

• Status: Published
• Publication Date: 03-Jul-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 13.220.20 - Fire protection
• Technical Committee: SC 22F - Power electronics for electrical transmission and distribution systems
• Drafting Committee: JMT 4 - TC 22/SC 22F/JMT 4
• Current Stage: PPUB - Publication issued
• Start Date: 15-Sep-2015
• Completion Date: 16-Jul-2015

Relations

• Amended By: IEC TR 62757:2015/AMD1:2019 - Amendment 1 - 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
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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.

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and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
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also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
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
...

IEC TR 62757 ®
Edition 1.1 2019-07
CONSOLIDATED VERSION
TECHNICAL
REPORT
colour
inside
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
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 corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
IEC TR 62757 ®
Edition 1.1 2019-07
CONSOLIDATED VERSION
TECHNICAL
REPORT
colour
inside
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 978-2-8322-7142-1

IEC TR 62757 ®
Edition 1.1 2019-07
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
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
– 2 – IEC TR 62757:2015+AMD1:2019 CSV
© IEC 2019
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 . 16
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 . 18
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 . 21
6.1 General . 21
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 . 24
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 . 25

© IEC 2019
8.1 General . 25
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 . 27
8.3.3 Inert gases . 28
8.3.4 Hydro fluorocarbons . 28
8.3.5 Other gases . 28
8.4 Installation requirements . 28
8.5 Guidelines for fire extinguishing agents . 29
9 Vent management . 29
9.1 General . 29
9.2 Design considerations . 30
9.2.1 General . 30
9.2.2 Natural ventilation . 30
9.2.3 Forced ventilation . 31
9.2.4 Design . 31
10 Control and integration of fire detection, fire protection and converter control
systems . 32
10.1 General . 32
10.2 Fire alarm classification . 32
10.2.1 General . 32
10.2.2 Classification by detection principle . 33
10.2.3 Classification by detection objective . 33
10.2.4 Detection system reliability . 34
10.3 Fire control system . 34
10.3.1 General . 34
10.3.2 Basic system functions . 34
10.3.3 Other system components . 35
10.3.4 Outline of system design . 35
10.4 Guidelines for integrated fire control systems . 36
11 Fire fighting and maintenance . 36
11.1 General . 36
11.2 Role of station and fire fighting personnel . 36
11.2.1 General . 36
11.2.2 Actions in case of a fire . 36
11.2.3 Fire fighting . 37
12 Guidance for purchaser specifications . 37
12.1 General . 37
12.2 Purchaser specification . 37
12.2.1 General . 37
12.2.2 Semiconductor valves . 38
12.2.3 Other valve hall equipment . 39
12.2.4 Valve hall construction . 39
12.2.5 Fire detection systems .
...