SIST EN IEC 62271-110:2018
(Main)High-voltage switchgear and controlgear - Part 110: Inductive load switching (IEC 62271-110:2017)
High-voltage switchgear and controlgear - Part 110: Inductive load switching (IEC 62271-110:2017)
This part of IEC 62271 is applicable to AC switching devices 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. It is applicable to switching devices
(including 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.
Switching unloaded transformers, i.e. breaking transformer magnetizing current, is not
considered in this document. The reasons for this are as follows:
a) Owing 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.
b) As detailed in IEC TR 62271-306, the characteristics of this duty are usually less severe
than any other inductive current switching duty. Such a duty may produce severe
overvoltages within the transformer winding(s) depending on the re-ignition behaviour of
the switching device and transformer winding resonance frequencies.
NOTE 1 The switching of tertiary reactors from the high-voltage side of the transformer is not covered by this
document.
NOTE 2 The switching of shunt reactors earthed through neutral reactors is not covered by this document.
However, the application of test results according to this document, on the switching of neutral reactor earthed
reactors (4-leg reactor scheme), is discussed in IEC TR 62271-306.
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 110: Schalten induktiver Lasten (IEC 62271-110:2017)
Appareillage à haute tension - Partie 110: Manoeuvre de charges inductives (IEC 62271-110:2017)
NEW!IEC 62271-110:2017 est disponible sous forme de IEC 62271-110:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 62271-110:2017 est applicable aux appareils de connexion 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. Le présent document est applicable aux appareils de connexion (y compris les disjoncteurs selon l’IEC 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 l’IEC 62271-106. Cette quatrième édition annule et remplace la troisième édition parue en 2012. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- tous les appareils de connexion sont dorénavant couverts, et non uniquement les disjoncteurs;
- un nombre limité d’essais T10 ne couvrent plus les essais d’établissement et de coupure de courant de bobine d’inductance shunt en dessous de 52 kV;
- l’évaluation et la consignation d’une plage de coupure sans réallumage ont été ajoutées.
Visokonapetostne stikalne in krmilne naprave - 110. del: Preklapljanje induktivnega bremena (IEC 62271-110:2017)
Ta del standarda IEC 62271 se uporablja za izmenične stikalne naprave za notranjo in zunanjo namestitev, ki delujejo pri frekvencah 50 Hz in 60 Hz v sistemih z napetostjo, višjo od 1000 V, ki se uporabljajo za preklapljanje induktivnega toka. Uporablja se za stikalne naprave (vključno z odklopniki v skladu s standardom IEC 62271-100), ki se uporabljajo za preklapljanje visokonapetostnih motornih tokov in soupornih reakcijskih tokov ter tudi za visokonapetostne kontaktorje, ki se uporabljajo za preklapljanje visokonapetostnih motornih tokov, kot je določeno v standardu IEC 62271-106. Preklapljanje nenapetih transformatorjev, tj. prekinjanje magnetnega toka transformatorja, v tem
dokumentu ni obravnavano. Razlogi za to so naslednji:
a) Zaradi nelinearnosti transformatorskega jedra v preskusnem laboratoriju z linearnimi sestavnimi deli ni mogoče pravilno modelirati preklapljanje magnetnega toka transformatorja.
Preskusi z razpoložljivim transformatorjem, npr. preskusnim transformatorjem, veljajo samo za preskušeni transformator in ne morejo biti reprezentativni za druge transformatorje.
b) Kot je opredeljeno v standardu IEC 62271-306, so lastnosti te obremenitve običajno manj stroge kot druge obremenitve preklapljanja induktivnega toka. Takšna obremenitev lahko povzroči resne prenapetosti v navitju transformatorja, kar je odvisno od lastnosti ponovnega vžiga stikalne naprave in resonančnih frekvenc navitja transformatorja.
OPOMBA 1: Ta dokument ne zajema preklapljanja terciarnih reaktorjev z visokonapetostne strani transformatorja.
OPOMBA 2 Ta dokument ne zajema preklapljanja soupornih reaktorjev, ozemljenih prek nevtralnih reaktorjev, vendar pa je uporaba rezultatov preskusa skladno s tem dokumentom v zvezi s preklapljanjem reaktorjev, ozemljenih prek nevtralnih reaktorjev (4-delna reaktorska shema), obravnavana v standardu IEC TR 62271-306.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 62271-110:2018
01-april-2018
1DGRPHãþD
SIST EN 62271-110:2013
Visokonapetostne stikalne in krmilne naprave - 110. del: Preklapljanje
induktivnega bremena (IEC 62271-110:2017)
High-voltage switchgear and controlgear - Part 110: Inductive load switching (IEC 62271-
110:2017)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 110: Schalten induktiver Lasten
(IEC 62271-110:2017)
Appareillage à haute tension - Partie 110: Manoeuvre de charges inductives (IEC 62271-
110:2017)
Ta slovenski standard je istoveten z: EN IEC 62271-110:2018
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST EN IEC 62271-110:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 62271-110:2018
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SIST EN IEC 62271-110:2018
EUROPEAN STANDARD EN IEC 62271-110
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2018
ICS 29.130.10 Supersedes EN 62271-110:2012
English Version
High-voltage switchgear and controlgear - Part 110: Inductive
load switching
(IEC 62271-110:2017)
Appareillage à haute tension - Partie 110: Manoeuvre de Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil
charges inductives 110: Schalten induktiver Lasten
(IEC 62271-110:2017) (IEC 62271-110:2017)
This European Standard was approved by CENELEC on 2017-11-09. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62271-110:2018 E
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SIST EN IEC 62271-110:2018
EN IEC 62271-110:2018 (E)
European foreword
The text of document 17A/1151/FDIS, future edition 2 of IEC 62271-110, prepared by SC17A
"Switching devices" of IEC/TC 17 "High-voltage switchgear and controlgear" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 62271-110:2018.
The following dates are fixed:
• latest date by which the document has to be (dop) 2018-08-09
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-11-09
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 62271-110:2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 62271-110:2017 was approved by CENELEC as a
European Standard without any modification.
2
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EN IEC 62271-110:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-441 - International Electrotechnical Vocabulary - -
(IEV) -- Chapter 441: Switchgear,
controlgear and fuses
IEC 62271-1 2017 High-voltage switchgear and controlgear -- EN 62271-1 2017
Part 1: Common specifications
IEC 62271-100 2008 High-voltage switchgear and controlgear -- EN 62271-100 2009
Part 100: Alternating current circuit-
breakers
+ A1 2012 + A1 2012
IEC 62271-106 2011 High-voltage switchgear and controlgear -- EN 62271-106 2011
Part 106: Alternating current contactors,
contactor-based controllers and motor-
starters
3
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SIST EN IEC 62271-110:2018
IEC 62271-110
®
Edition 4.0 2017-10
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
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-4866-9
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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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
3
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
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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
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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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and
non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates
closely with the International Organization for Standardization (ISO) in accordance with conditions determined
by 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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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: Switching
devices, of IEC technical committee 17: High-voltage switchgear and controlgear.
This fourth edition cancels and replaces the third edition published in 2012 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– all switching devices are now covered, not only circuit-breakers;
– a limited number of T10 tests no longer covers shunt-reactor switching tests below 52 kV;
– evaluation and reporting of a re-ignition-free arcing time window has been added.
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The text of this International Standard is based on the following documents:
FDIS Report on voting
17A/1151/FDIS 17A/1155/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
The contents of the corrigendum of December 2017 have been included in this copy.
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HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 110: Inductive load switching
1 Scope
This part of IEC 62271 is applicable to AC switching devices 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. It is applicable to switching devices
(including 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.
Switching unloaded transformers, i.e. breaking transformer magnetizing current, is not
considered in this document. The reasons for this are as follows:
a) Owing 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.
b) As detailed in IEC TR 62271-306, the characteristics of this duty are usually less severe
than any other inductive current switching duty. Such a duty may produce severe
overvoltages within the transformer winding(s) depending on the re-ignition behaviour of
the switching device and transformer winding resonance frequencies.
NOTE 1 The switching of tertiary reactors from the high-voltage side of the transformer is not covered by this
document.
NOTE 2 The switching of shunt reactors earthed through neutral reactors is not covered by this document.
However, the application of test results according to this document, on the switching of neutral reactor earthed
reactors (4-leg reactor scheme), is discussed in IEC TR 62271-306.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-441, International Electrotechnical Vocabulary – Chapter 441: Switchgear,
controlgear and fuses (available at www.electropedia.org)
IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications
for alternating current switchgear and controlgear
IEC 62271-100:2008, High-voltage switchgear and controlgear – Part 100: Alternating current
circuit-breakers
IEC 62271-100:2008/AMD1:2012
IEC 62271-106:2011, High-voltage switchgear and controlgear – Part 106: Alternating current
contactors, contactor-based controllers and motor-starters
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-441,
IEC 62271-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
inductive current
power-frequency current drawn by an inductive circuit having a power factor 0,5 or less
3.2
current chopping
abrupt current interruption in a switching device at a point-on-wave other than the natural
power-frequency current zero
3.3
virtual current chopping
current chopping in one of the three phases in a three-phase circuit originated by transients in
another phase of the circuit
3.4
suppression peak
first peak of the transient voltage to earth on the load side of the switching device following
current interruption
Note 1 to entry: Suppression peak is not necessarily the absolute maximum of the transient recovery voltage.
Previous breakdowns may have appeared at higher voltage values.
3.5
recovery peak
maximum value of the voltage across the switching device occurring when the polarity of the
recovery voltage is equal to the polarity of the power-frequency voltage
Note 1 to entry: Recovery peak is not necessarily the absolute maximum of the transient recovery voltage.
Previous breakdowns may have appeared at higher voltage values.
3.6
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
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.
3.7
re-ignition-free arcing time window
period of arc duration during a breaking operation during which the contacts of a mechanical
switching device reach sufficient distance to exclude re-ignition
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4 Type tests
4.1 General
Circuit-breakers according to IEC 62271-100 and contactors according to IEC 62271-106 do
not have dedicated inductive switching ratings. However, switching devices applied for this
purpose shall meet the requirements of this document.
For shunt reactor switching test of circuit-breakers, the rated insulation level values stated in
Tables 1a, 1b, 3 and 4 of IEC 62271-1:2017 are applicable with the exception of combined
voltage tests across the isolating distance (columns (6) and (8) in Table 3 and column (7) in
Table 4).
The type tests are in addition to those specified in the relevant product standard, with the
exception of short-line faults, out-of-phase switching and capacitive current switching.
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.
Inductive current switching tests performed for a given current level and type of application
may be considered valid for another current rating and same type of application as detailed
below:
a) for shunt reactor switching at rated voltages of 52 kV and above, tests at a particular
current level are to be considered valid for applications with a higher current level up to
150 % of the tested current value;
b) for shunt reactor switching at rated voltages below 52 kV, type testing is required;
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 for circuit-breakers and up to the rated operational current for
contactors.
With respect to a) the purpose of type testing is also to determine a re-ignition-free arcing
time window for controlled switching purposes (refer to IEC TR 62271-302) and caution
should be exercised when considering applications at higher currents than the tested values
since the re-ignition-free arcing window can increase at higher current.
Annex B of IEC 62271-100:2008 can be used with respect to tolerances on test quantities.
4.2 Miscellaneous provisions for inductive load switching tests
Subclause 6.102 of IEC 62271-100:2008+IEC 62271-100:2008/AMD1:2012 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.
For gas filled switching devices (including vacuum switching devices using gaseous media for
insulation), tests shall be performed at the rated functional pressure for interruption and
insulation, except for test-duty 4, where the pressure shall be the minimum functional
pressure for interruption and insulation.
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4.3 High-voltage motor current switching tests
4.3.1 Applicability
Subclause 4.3 is applicable to three-phase alternating current switching devices 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 switching devices 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 switching device may be of a higher rated
voltage than the motor when connected to the motor through a stepdown transformer.
However, the usual application is a direct cable connection between switching device and
motor. When tests are required, they shall be made in accordance with 4.3.2 to 4.3.9.
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.
4.3.2 General
The switching tests can be either field tests or laboratory tests. As regards overvoltages, the
switching of the current of a starting or stalled motor is usually the more severe operation.
Due to the non-linear behaviour of the motor iron core, it is not possible to exactly model the
switching of motor current using linear components in a test station. Tests using linear
components to simulate the motors can be considered to be more conservative than switching
actual motors.
For laboratory tests a standardized circuit simulating the stalled condition of a motor is
specified (refer to Figure 1). The parameters of this test circuit have been chosen to represent
a relatively severe case with respect to overvoltages and will cover the majority of service
applications.
The laboratory tests are performed to prove the ability of a switching device to switch motors
and to establish its behaviour with respect to switching overvoltages, re-ignitions and current
chopping. These characteristics may serve as a basis for estimates of the switching device’s
performance in other motor circuits. Tests performed with the test currents defined in 4.3.3
and 4.3.4 demonstrate the capability of the switching device to switch high-voltage motors up
to its rated interrupting current.
For field tests, actual circuits are used with a supply system on the source side and a cable
and motor on the load side.
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