IEC TR 62757:2015/AMD1:2019

IEC TR 62757 ®
Edition 1.0 2019-07
TECHNICAL
REPORT
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
IEC TR 62757:2015-07/AMD1:2019-07(en)

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IEC TR 62757 ®
Edition 1.0 2019-07
TECHNICAL
REPORT
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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.20 ISBN 978-2-8322-7094-3

– 2 – IEC TR 62757:2015/AMD1 2019
© IEC 2019
FOREWORD
This amendment has been prepared by subcommittee 22F: Power electronics for electrical
transmission and distribution systems, of IEC technical committee 22: Power electronic
systems and equipment
The text of this amendment is based on the following documents:
Draft TR Report on voting
22F/520/DTR 22F/526/RVDTR
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
___________
4.1 General
Add, to the end of the first sentence of the first existing paragraph, the words "and current
transducers."
4.2.3.2 Thyristors and diodes
Add, after the first existing paragraph, the following new paragraph, which is the second
paragraph of 4.2.3.3.
The thyristors and diodes themselves are non-flammable and, because failure relieves other
components from significant voltage stress, it is often arranged that other component faults
lead directly or indirectly to thyristor short circuit, thereby avoiding a hazardous condition
elsewhere.
4.2.3.3 IGBT and similar semiconductor devices
Change the existing title of 4.2.3.3 by the following new title:
4.2.3.3 IGBT- diode pairs
Delete, in the first sentence of the first existing paragraph, the words "at the time of writing".
Delete the second existing paragraph.
4.2.3.4 Capacitors
Replace the last existing paragraph by the following new paragraph:

IEC TR 62757:2015/AMD1 2019 – 3 –
© IEC 2019
Capacitors that are dry type, normally containing polyurethane, silicone gel or N2 and SF6
gas, have no flammable fluids that can leak out of the housing.
4.2.3.5 Reactors
Replace, in the first existing paragraph, the second sentence by the following new sentence:
A mode of failure of valve reactors is overheating due to total or partial blockage of the
cooling pipes or the leakage of a joint within the reactors.
4.2.3.8 Light guides
Replace the existing subclause, including its title, by the following new subclause and title:
4.2.3.8 Fibre optics
Fibre optics, either individually or in bundles, involve a risk of fire ignition, if exposed to
conductive surface contaminati
...