IEC 62271-112:2021

IEC 62271-112 ®
Edition 2.0 2021-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High-voltage switchgear and controlgear –
Part 112: Alternating current high-speed earthing switches for secondary arc
extinction on transmission lines

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IEC 62271-112 ®
Edition 2.0 2021-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High-voltage switchgear and controlgear –
Part 112: Alternating current high-speed earthing switches for secondary arc
extinction on transmission lines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10; 29.130.99 ISBN 978-2-8322-5282-6

– 2 – IEC 62271-112:2021 RLV  IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Normal and special service conditions . 8
5 Ratings . 8
6 Design and construction . 11
7 Type tests . 13
8 Routine tests . 17
9 Guide to the selection of HSESs (informative) . 17
10 Information to be given with enquiries, tenders and orders (informative) . 17
10 Rules for transport, storage, installation, operation and maintenance .
11 Transport, storage, installation, operating instructions and maintenance. 17
12 Safety . 18
Annex A (informative) Background information on the use of HSESs . 19
Annex B (informative) Induced current and voltage conditions for other cases . 25
Bibliography . 30

Figure 1 – Explanation of a multi-phase auto-reclosing scheme . 7
Figure 2 – Timing chart of HSES and circuit-breakers . 10
Figure A.1 – Single-line diagram of a power system . 20
Figure A.2 – Timing chart of the HSESs in relation to the transmission line circuit-
breakers . 20
Figure A.3 – Typical timing chart showing the time between fault initiation and a
successful re-close of the transmission line circuit-breakers . 22
Figure B.1 – System condition to explain successive fault . 26
Figure B.2 – Example of waveforms of delayed current zero phenomena . 26
Figure B.3 – Typical test circuit for electromagnetic coupling test-duty of a HSES with
delayed current zero crossings . 28
Figure B.4 – Typical test circuit for electrostatic coupling test-duty of HSES with
delayed current zero crossings . 28

Table 1 – Standardized values of rated induced currents and voltages .
Table 2 – Items to be listed on nameplate of a HSES .
Table 1 – Nameplate information . 12
Table 2 – Standard values of rated induced currents and voltages . 15
Table A.1 – Comparison of earthing switches . 23
Table A.2 – Comparison of a four-legged reactor and HSES . 24
Table B.1 – Preferred values for single-phase earth fault with delayed current zero
phenomena in the presence of a successive fault . 27
Table B.2 – Preferred values for multi-phase earth faults in a double-circuit system . 29
Table B.3 – Preferred values for covering the cases of categories 0 and 1 . 29

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 112: Alternating current high-speed earthing switches
for secondary arc extinction on transmission lines

FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 62271-112:2013. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

– 4 – IEC 62271-112:2021 RLV  IEC 2021
IEC 62271-112 has been prepared by subcommittee 17A: Switching devices, of IEC technical
committee 17: High-voltage switchgear and controlgear. It is an International Standard.
This second edition cancels and replaces the first edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
The document has been updated to the second edition of IEC 62271-1:2017.
The text of this International Standard is based on the following documents:
FDIS Report on voting
17A/1311/FDIS 17A/1314/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
This International Standard should be read in conjunction with IEC 62271-1:2017, to which it
refers and which is applicable, unless otherwise specified. In order to simplify the indication of
corresponding requirements, the same numbering of clauses and subclauses is used as in
IEC 62271-1:2017. Amendments to these clauses and subclauses are given under the same
numbering, whilst additional subclauses, are numbered from 101.
A list of all parts in the IEC 62271 series, published under the general title High-voltage
switchgear and controlgear, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
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HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 112: Alternating current high-speed earthing switches
for secondary arc extinction on transmission lines

1 General
1 Scope
This part of IEC 62271 applies to AC high-speed earthing switches (hereinafter termed HSES)
designed for indoor and outdoor installation and for operation at service frequencies of 50 Hz
and 60 Hz on systems having rated voltages of 550 kV and above.
HSESs described in this document are intended to extinguish the secondary arc remaining after
clearing faults on transmission lines by the circuit-breakers.
For more detailed inf
...