IEC 62271-110:2023

IEC 62271-110 ®
Edition 5.0 2023-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High-voltage switchgear and controlgear –
Part 110: Inductive load switching

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IEC 62271-110 ®
Edition 5.0 2023-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High-voltage switchgear and controlgear –
Part 110: Inductive load switching
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10 ISBN 978-2-8322-6692-2

– 2 – IEC 62271-110:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Type tests . 8
4.1 General . 8
4.2 Miscellaneous provisions for inductive load switching tests . 8
4.3 High-voltage motor current switching tests . 9
4.3.1 Applicability . 9
4.3.2 General . 9
4.3.3 Characteristics of the supply circuits . 10
4.3.4 Characteristics of the load circuit . 11
4.3.5 Test voltage . 11
4.3.6 Test-duties . 12
4.3.7 Test measurements . 12
4.3.8 Behaviour and condition of switching device . 12
4.3.9 Test report . 13
4.4 Shunt reactor current switching tests . 14
4.4.1 Applicability . 14
4.4.2 General . 15
4.4.3 Test circuits . 15
4.4.4 Characteristics of the supply circuit . 18
4.4.5 Characteristics of the connecting leads . 18
4.4.6 Characteristics of the load circuits . 18
4.4.7 Earthing of the test circuit . 23
4.4.8 Test voltage . 23
4.4.9 Test-duties . 23
Annex A (normative) Calculation of t values . 27
Bibliography . 29

Figure 1 – Motor switching test circuit and summary of parameters . 10
Figure 2 – Illustration of voltage transients at interruption of inductive current for first
phase clearing in a three-phase non-effectively earthed circuit . 14
Figure 3 – Reactor switching test circuit – Three-phase test circuit for in-service load
circuit configurations 1 and 2 (Table 2) . 16
Figure 4 – Reactor switching test circuit – Single-phase test circuit for in-service load
circuit configurations 1, 2 and 4 (Table 2) . 17
Figure 5 – Reactor switching test circuit – Three-phase test circuit for in-service load
circuit configuration 3 (Table 2) . 18
Figure 6 – Illustration of voltage transients at interruption of inductive current for a
single-phase test . 26

Table 1 – Test-duties at motor current switching tests . 12
Table 2 – In-service load circuit configurations . 15

Table 3 – Values of prospective transient recovery voltages – Rated voltages 12 kV to
170 kV for effectively and non-effectively earthed systems – Switching shunt reactors
with isolated neutrals (Table 2: In-service load circuit configuration 1) . 19
Table 4 – Values of prospective transient recovery voltages – Rated voltages 100 kV to
1  200 kV for effectively earthed systems – Switching shunt reactors with earthed
neutrals (See Table 2: In-service load circuit configuration 2) . 20
Table 5 – Values of prospective transient recovery voltages – Rated voltages 12 kV to
52 kV for effectively and non-effectively earthed systems – Switching shunt reactors
with isolated neutrals (see Table 2: In-service load circuit configuration 3) . 21
Table 6 – Values of prospective transient recovery voltages – Rated voltages 12 kV to
52 kV for effectively and non-effectively earthed systems – Switching shunt reactors
with earthed neutrals (see Table 2: In-service load circuit configuration 4) . 22
Table 7 – Load circuit 1 test currents . 22
Table 8 – Load circuit 2 test currents . 23
Table 9 – Test-duties for reactor current switching tests . 24

– 4 – IEC 62271-110:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 110: Inductive load switching

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 62271-110:2017. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
IEC 62271-110 has been prepared by subcommittee 17A: Switching devices, of IEC technical
committee 17: High-voltage switchgear and controlgear. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) references to IEC 62271-100 and IEC 62271-106 have been updated to the latest editions.
The text of this document is based on the following documents:
Draft Report on voting
17A/1368/FDIS 17A/1376/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/publications.
A list of all parts of the IEC 62271 series can be found, under the general title High-voltage
switchgear and controlgear, on the IEC website.
The committee has decided that the cont
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