IEC 62271-110:2012

High-voltage switchgear and controlgear - Part 110: Inductive load switching

IEC 62271-110:2012 is applicable to a.c. circuit-breakers designed for indoor or outdoor installation, for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 1 000 V and applied for inductive current switching with or without additional short-circuit current breaking duties. The standard is applicable to circuit-breakers in accordance with IEC 62271-100 that are used to switch high-voltage motor currents and shunt reactor currents and also to high-voltage contactors used to switch high-voltage motor currents as covered by IEC 62271-106. For circuit-breakers applied to switch shunt reactor currents at rated voltages according to IEC 62271-1:2007 Tables 2a and 2b, combined voltage tests across the isolating distance are not required (refer to 4.2). This third edition cancels and replaces the second edition published in 2009 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- former Table 2 has been split into three new tables to conform with IEC 62271-100 and to address actual in service circuit configurations.
- the criteria for successful testing has been revised to a more explicit statement (see 6.114.11a).
- comments received in response to 17A/959/CDV and 17A/981/RVC have been addressed.
The contents of the corrigendum of October 2012 have been included in this copy.
This publication is to be read in conjunction with IEC 62271-1:2007.

Appareillage à haute tension - Partie 110: Manoeuvre de charges inductives

La CEI 62271-110:2012 est applicable aux disjoncteurs à courant alternatif conçus pour une installation à l'intérieur ou à l'extérieur, et pour fonctionner à des fréquences de 50 Hz à 60 Hz, sur des réseaux de tensions supérieures à 1 000 V, et prévus pour l'établissement et la coupure de courants inductifs avec ou sans pouvoir de coupure de court-circuit additionnel. Cette norme est applicable aux disjoncteurs selon la CEI 62271-100, qui sont utilisés pour l'établissement et la coupure de courants de moteurs à haute tension et de courants de bobines d'inductance shunt, et aussi aux contacteurs à haute tension utilisés pour l'établissement et la coupure de courants de moteurs à haute tension, tels que couverts par la CEI 62271-106. Pour les disjoncteurs appliqués en vue de la coupure des courants de bobines d'inductance shunt à des tensions assignées conformément aux Tableaux 2a et 2b de la CEI 62271-1:2007, les essais de tensions combinées à travers la distance de sectionnement ne sont pas exigés (se reporter à 4.2). Cette troisième édition annule et remplace la deuxième édition parue en 2009, et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- l'ancien Tableau 2 a été divisé en trois nouveaux tableaux, afin d'être conforme à la CEI 62271-100, et pour traiter des configurations réelles de circuits en service;
- les critères pour que les essais soient satisfaisants ont été révisés, afin d'être plus explicites (voir 6.114.11a);
- les commentaires reçus en réponse aux documents 17A/959/CDV et 17A/981/RVC ont été traités.
Le contenu du corrigendum d'octobre 2012 a été pris en considération dans cet exemplaire.
Cette publication doit être lue conjointement avec la CEI 62271-1:2007.

General Information

• Status: Published
• Publication Date: 26-Sep-2012
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: SC 17A - Switching devices
• Drafting Committee: MT 32 - TC 17/SC 17A/MT 32
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 05-Oct-2017

Relations

• Revises: IEC 62271-110:2009 - High-voltage switchgear and controlgear - Part 110: Inductive load switching
• Effective Date: 05-Sep-2023
• Revised: IEC 62271-110:2017 - High-voltage switchgear and controlgear - Part 110: Inductive load switching
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62271-110
®

Edition 3.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


High-voltage switchgear and controlgear –
Part 110: Inductive load switching

Appareillage à haute tension –
Partie 110: Manœuvre de charges inductives


IEC 62271-110:2012

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IEC 62271-110

®


Edition 3.0 2012-09




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











High-voltage switchgear and controlgear –

Part 110: Inductive load switching




Appareillage à haute tension –

Partie 110: Manœuvre de charges inductives
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX V


ICS 29.130.10 ISBN 978-2-83220-410-8



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 62271-110 © IEC:2012
CONTENTS
FOREWORD . 4
1 General . 6
1.1 Scope . 6
1.2 Normative references . 6
Normal and special service conditions . 6
2
3 Terms and definitions . 7
4 Ratings . 8
5 Design and construction . 8
6 Type tests . 8
6.1 General . 8
6.2 Dielectric tests . 9
6.3 Radio interference voltage (r.i.v.) test . 9
6.4 Measurement of the resistance of circuits . 9
6.5 Temperature-rise tests . 9
6.6 Short-time withstand current and peak withstand current tests . 9
6.7 Verification of protection . 9
6.8 Tightness tests . 9
6.9 Electromagnetic compatibility tests (EMC) . 9
Mechanical and environmental tests . 9
6.101
6.102 Miscellaneous provisions for making and breaking tests . 9
6.103 Test circuits for short-circuit making and breaking tests . 10
6.104 Short-circuit test quantities . 10
6.105 Short-circuit test procedure . 10
6.106 Basic short-circuit test-duties . 10
6.107 Critical current tests. 10
6.108 Single-phase and double-earth fault tests . 10
6.113 High-voltage motor current switching tests . 10
6.114 Shunt reactor current switching tests . 16
7 Routine tests . 27
8 Guide to selection of switchgear and controlgear . 27
9 Information to be given with enquiries, tenders and orders . 27
10 Transport, storage, installation, operation and maintenance . 27
11 Safety . 27
12 Influence of the product on the environment . 27
Annex A (normative) Calculation of t values . 29
3
Bibliography . 31

Figure 1 – Motor switching test circuit and summary of parameters . 12
Figure 2 – Illustration of voltage transients at interruption of inductive current for first
phase clearing in a three-phase non-effectively earthed circuit . 16
Figure 3 – Reactor switching test circuit − Three-phase test circuit for in-service load
circuit configurations 1 and 2 (Table 2) . 18
Figure 4 – Reactor switching test circuit − Single-phase test circuit for in-service load
circuit configurations 1, 2 and 4 (Table 2) . 19

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62271-110 © IEC:2012 – 3 –
Figure 5 – Reactor switching test circuit − Three-phase test circuit for in-service load
circuit configuration 3 (Table 2) . 20
Figure 6 – Illustration of voltage transients at interruption of inductive current for a
single-phase test . 28

Table 1 – Test duties at motor current switching tests . 14
Table 2 – In-service load circuit configurations . 17
Table 3 – Standard 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) . 21
Table 4 – Standard values of prospective transient recovery voltages – Rated voltages
100 kV to 1 200 kV for effectively earthed systems – Switching shunt reactors with

earthed neutrals (Table 2: In-service load circuit configuration 2). 22
Table 5 – Standard 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 (Table 2: In-service load circuit configuration 3) . 23
Table 6 – Standard 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 (Table 2: In-service load circuit configuration 4) . 23
Table 7 – Load circuit 1 test currents . 24
Table 8 – Load circuit 2 test currents . 24
Table 9 – Test duties for reactor current switching tests . 25

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________

HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 110: Inductive load switching


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62271-110 has been prepared by subcommittee 17A: High-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This third edition cancels and replaces the second edition published in 2009 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– former Table 2 has been split into three new tables to conform with IEC 62271-100 and to
address actual in-service circuit configurations.
– the criteria for successful testing has been revised to a more explicit statement (see
6.114.11a).
– comments received in response to 17A/959/CDV and 17A/981/RVC have been addressed.

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62271-110 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
17A/1016/FDIS 17A/1025/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard is to be read in conjunction with IEC 62271-1:2007, and with
IEC 62271-100:2008, to which it refers and which are 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 and IEC 62271-100. Additional subclauses
are numbered from 101.
A list of all the parts in the IEC 62271 series, 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 publication will remain unchanged until
the stability date indicated on the IEC web site 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.

The contents of the corrigendum of October 2012 have been included in this copy.

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– 6 – 62271-110 © IEC:2012
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 110: Inductive load switching



1 General
1.1 Scope
This part of IEC 62271 is applicable to a.c. circuit-breakers designed for indoor or outdoor
installation, for operation at frequencies of 50 Hz and 60 Hz on systems having voltages
above 1 000 V and applied for inductive current switching with or without additional short-
circuit current breaking duties. The standard is applicable to circuit-breakers in accordance
with IEC 62271-100 that are used to switch high-voltage motor currents and shunt reactor
currents and also to high-voltage contactors used to switch high-voltage motor currents as
covered by IEC 62271-106. For circuit-breakers applied to switch shunt reactor currents at
rated voltages according to IEC 62271-1:2007 Tables 2a and 2b, combined voltage tests
across the isolating distance are not required (refer to 4.2).
Switching unloaded transformers, i.e. breaking transformer magnetizing current, is not
considered in this standard. The reasons for this are as follows:
a) due to the non-linearity of the transformer core, it is not possible to correctly model the
switching of transformer magnetizing current using linear components in a test laboratory.
Tests conducted using an available transformer, such as a test transformer, will only be
valid for the transformer tested and cannot be representative for other transformers;
1
b) as detailed in IEC 62271-306 , the characteristics of this duty are usually less severe than
any other inductive current switching duty. It should be noted that such a duty may
produce severe overvoltages within the transformer winding(s) depending on the circuit-
breaker re-ignition behaviour and transformer winding resonance frequencies.
Short-line faults, out-of-phase current making and breaking and capacitive current switching
are not applicable to circuit-breakers applied to switch shunt reactors or motors. These duties
are therefore not included in this standard.
Subclause 1.1 of IEC 62271-100:2008 is otherwise applicable.
1.2 Normative references
Subclause 1.2 of IEC 62271-100:2008 is applicable with the following addition:
IEC 62271-100:2008, High-voltage switchgear and controlgear – Part 100: Alternating-current
circuit-breakers
2 Normal and special service conditions
Clause 2 of IEC 62271-1:2007 is applicable.
___________
1
 To be published.

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62271-110 © IEC:2012 – 7 –
3 Terms and definitions
For the purposes of this document, the definitions of IEC 60050-441 and IEC 62271-1 apply
as well as the following specific to inductive load switching.
3.101
inductive current
power-frequency current through a circuit-breaker drawn by an inductive circuit having a
power factor 0,5 or less
3.102
small inductive current
inductive current having a steady state value considerably less than the rated short-circuit
breaking current
3.103
current chopping
abrupt current interruption in the circuit-breaker at a point-on-wave other than the natural
power-frequency current zero of the circuit connected to the circuit-breaker
3.104
virtual current chopping
current chopping originated by transients in (parts of) the circuit
3.105
chopping current
current interruption prior to the natural power-frequency current zero of the circuit connected
to the switching device
3.106
chopping level
maximum recorded value of the chopping current due to true current chopping in a specific
circuit under rated voltage and normal operating conditions
3.107
load side oscillation
oscillation of the interrupted load side network after current chopping or natural current zero
3.108
suppression peak
first peak of the transient voltage to earth on the load side of the circuit-breaker
3.109
recovery peak
maximum value of the voltage across the circuit-breaker occurring after definite polarity
change of the recovery voltage
Note 1 to entry: Suppression peak and recovery peak are not necessarily the absolute maxima in the transient
recovery voltage. Previous breakdowns may have appeared at higher voltage values.
3.110
voltage escalation
increase in the amplitude of the prospective recovery voltage of the load circuit, produced by
the accumulation of energy due to repeated re-ignitions

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– 8 – 62271-110 © IEC:2012
3.111
re-ignition
resumption of current between the contacts of a mechanical switching device during a
breaking operation with an interval of zero current of less than a quarter cycle of power
frequency
[SOURCE: IEC 60050-441:1998, 441-17-45]
Note 1 to entry: In the case of inductive load switching the initiation of the re-ignition is a high frequency event,
which can be of a single or multiple nature and may in some cases be interrupted without power frequency follow
current.
4 Ratings
Clause 4 of IEC 62271-100:2008 is applicable except for the references to short-line faults,
out-of-phase making and breaking, capacitive current switching and as noted in specific
subclauses below. Circuit-breakers do not normally have inductive load switching ratings.
However, circuit-breakers applied for this purpose should meet the requirement of this
standard part.
4.2 Rated insulation level
Subclause 4.2 of IEC 62271-1:2007 is applicable with the following addition:
The rated values stated in Tables 1a and 1b and Tables 2a and 2b of IEC 62271-1:2007 are
applicable with the exception of columns (6) and (8) in Table 2a and column (7) in Table 2b.
NOTE 1 The reason for this exception is the source-less nature of the shunt reactor load circuit.
NOTE 2 In some cases (high chopping overvoltage levels, or where a neutral reactor is present or in cases of
shunt reactors with isolated neutral), it can be necessary to specify an appropriate insulation level which is higher
than the rated values stated above.
5 Design and construction
Clause 5 of IEC 62271-100:2008 is applicable.
6 Type tests
6.1 General
Subclause 6.1 of IEC 62271-100:2008 is applicable with the following addition:
Inductive current switching tests performed for a given current rating and type of application
may be considered valid for another current rating and same type of application as detailed
below:
a) for high-voltage shunt reactor switching at rated voltage 52 kV and above, tests at a
particular current rating are to be considered valid for applications up to 150 % of the
tested current value;
b) for shunt reactor switching at rated voltage below 52 kV, type testing is required but short
circuit test duties T30 and T10 will cover the requirements provided that the TRV values of
T30 and T10 are equal to or higher than the reactor switching TRV values.
c) for high-voltage motor switching, type testing for stalled motor currents at 100 A and 300 A
is considered to cover stalled motor currents in the range 100 A to 300 A and up to the
current associated with the short-circuit current of test duty T10 according to 6.106.1 of
IEC 62271-100:2008.

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62271-110 © IEC:2012 – 9 –
With respect to 6.1a) the purpose of type testing is to also determine reignition-free zones for
controlled switching purposes and caution should be exercised when considering applications
at higher currents than the tested values.
Annex B of IEC 62271-100:2008 is applicable with respect to tolerances on test quantities.
6.2 Dielectric tests
Subclause 6.2 of IEC 62271-100:2008 is applicable with the following addition:
Refer to 4.2.
6.3 Radio interference voltage (r.i.v.) test
Subclause 6.3 of IEC 62271-1:2007 is applicable.
6.4 Measurement of the resistance of circuits
Subclause 6.4 of IEC 62271-1:2007 is applicable.
6.5 Temperature-rise tests
Subclause 6.5 of IEC 62271-1:2007 is applicable.
6.6 Short-time withstand current and peak withstand current tests
Subclause 6.6 of IEC 62271-1:2007 is applicable.
6.7 Verification of protection
Subclause 6.7 of IEC 62271-1:2007 is applicable.
6.8 Tightness tests
Subclause 6.8 of IEC 62271-1:2007 is applicable.
6.9 Electromagnetic compatibility tests (EMC)
Subclause 6.9 of IEC 62271-1:2007 is applicable.
6.101 Mechanical and environmental tests
Subclause 6.101 of IEC 62271-100:2008 is applicable.
6.102 Miscellaneous provisions for making and breaking tests
Subclause 6.102 of IEC 62271-100:2008 is applicable with the following addition:
High-voltage motor current and shunt reactor switching tests shall be performed at rated
auxiliary and control voltage or, where necessary, at maximum auxiliary and control voltage to
facilitate consistent control of the opening and closing operation according to 6.102.3.1 of
IEC 62271-100:2008 and at rated functional pressure for interruption and insulation.
For gas circuit-breakers, a shunt reactor switching test shall also be performed at the
minimum functional pressure for interruption and insulation. This requirement applies for test
duty 4 only (see 6.114.9).

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– 10 – 62271-110 © IEC:2012
6.103 Test circuits for short-circuit making and breaking tests
Subclause 6.103 of IEC 62271-100:2008 is applicable.
6.104 Short-circuit test quantities
Subclause 6.104 of IEC 62271-100:2008 is applicable.
6.105 Short-circuit test procedure
Subclause 6.105 of IEC 62271-100:2008 is applicable.
6.106 Basic short-circuit test-duties
Subclause 6.106 of IEC 62271-100:2008 is applicable.
6.107 Critical current tests
Subclause 6.107 of IEC 62271-100:2008 is applicable.
6.108 Single-phase and double-earth fault tests
Subclause 6.108 of IEC 62271-100:2008 is applicable.
Subclauses 6.109 to 6.112 of IEC 62271-100:2008 are not applicable to this part of
IEC 62271 series.
6.113 High-voltage motor current switching tests
6.113.1 Applicability
This subclause is applicable to three-phase alternating current circuit-breakers having rated
voltages above 1 kV and up to 17,5 kV, which are used for switching high-voltage motors.
Tests may be carried out at 50 Hz with a relative tolerance of ±10 % or 60 Hz with a relative
tolerance of ±10 %, both frequencies being considered equivalent.
Motor switching tests are applicable to all three-pole circuit-breakers having rated voltages
equal to or less than 17,5 kV, which may be used for the switching of three-phase
asynchronous squirrel-cage or slip-ring motors. The circuit-breaker may be of a higher rated
voltage than the motor when connected to the motor through a stepdown transformer.
However, the more usual application is a direct cable connection between circuit-breaker and
motor. When tests are required, they shall be made in accordance with 6.113.2 to 6.113.9.
When overvoltage limitation devices are mandatory for the tested equipment, the voltage
limiting devices may be included in the test circuit provided that the devices are an intrinsic
part of the equipment under test.
No limits to the overvoltages are given as the overvoltages are only relevant to the specific
application. Overvoltages between phases may be as significant as phase-to-earth
overvoltages.
6.113.2 General
The switching tests can be either f
...