IEC 62271-205:2008

IEC 62271-205
Edition 1.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 205: Compact switchgear assemblies for rated voltages above 52 kV

Appareillage à haute tension –
Partie 205: Ensembles d'appareillages compacts de tensions assignées
supérieures à 52 kV
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IEC 62271-205
Edition 1.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 205: Compact switchgear assemblies for rated voltages above 52 kV

Appareillage à haute tension –
Partie 205: Ensembles d'appareillages compacts de tensions assignées
supérieures à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 29.130.10; 29.130.99 ISBN 2-8318-9511-1

– 2 – 62271-205 © IEC:2008
CONTENTS
FOREWORD.4

1 General .6
1.1 Scope.6
1.2 Normative references .7
2 Normal and special service conditions .8
3 Terms and definitions .8
3.1 General terms .8
3.2 Compact switchgear assembly .9
4 Rating .9
4.1 Rated voltage (U ) .9
r
4.2 Rated insulation level .10
4.3 Rated frequency (f ).10
r
4.4 Rated normal current (I ) and temperature rise .10
r
4.5 Rated short-time withstand current (I ) .10
k
4.6 Rated peak withstand current (I ) .10
p
4.7 Rated duration of short circuit (t ) .10
k
4.8 Rated supply voltage of closing and opening devices and of auxiliary and
control circuits (U ).10
a
4.9 Rated supply frequency of closing and opening devices and of auxiliary
circuits .10
5 Design and construction .11
5.3 Earthing of switchgear and controlgear .11
5.101 Earthing of compact switchgear assemblies and their controlgear.11
5.102 Pressure relief devices .11
5.10 Nameplates .11
5.12 Position indication .11
5.103 Locking devices for maintenance operation .11
5.104 Movement of pressurized devices .12
5.105 Isolating distance for maintenance.12
6 Type tests .12
6.1 General .12
6.2 Dielectric tests.13
6.3 Radio interference voltage (r.i.v.) test .13
6.4 Measurement of the resistance of circuits .14
6.5 Temperature-rise tests.14
6.6 Short-time withstand current and peak withstand current tests.14
6.101 Mechanical and environmental tests .15
7 Routine tests .17
7.1 Dielectric test on the main circuit .17
7.2 Tests on auxiliary and control circuits .17
7.3 Measurement of the resistance of the main circuit .17
7.101 Functional tests on auxiliary and control circuits .17
8 Guide to the selection of switchgear and controlgear.17
8.101 Guide to the selection of compact switchgear assemblies .17
9 Information to be given with enquiries, tenders and orders .18

62271-205 © IEC:2008 – 3 –
10 Transport, storage, installation, operation and maintenance .18
10.1 Conditions during transport, storage and installation .18
10.2 Installation .18
10.3 Operation .18
10.4 Maintenance.18
11 Safety.18

Annex AA (informative) Explanations of compact switchgear assemblies .19

Bibliography.23

Figure AA.1 – Example for type 1 .21
Figure AA.2 – Example for type 2 .21
Figure AA.3 – Example for type 3 .22
Figure AA.4 – Example for type 3 .22

Table 101 – Type tests on the compact switchgear assembly .12

– 4 – 62271-205 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 205: Compact switchgear assemblies
for rated voltages above 52 kV

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 62271-205 has been prepared by subcommittee 17C: High-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
This standard should be read in conjunction with IEC 62271-1, first edition, 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 62771-1. Amendments to these clauses and subclauses are given under the same
numbering, whilst additional subclauses are numbered from 101.

62271-205 © IEC:2008 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
17C/418/FDIS 17C/423/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.
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 maintenance result 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.
– 6 – 62271-205 © IEC:2008
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 205: Compact switchgear assemblies
for rated voltages above 52 kV

1 General
1.1 Scope
This part of IEC 62271 applies to compact switchgear assemblies consisting of at least one
switching device directly connected to, or sharing components with, one or more other
devices such that there is an interaction between the functions of the individual devices. Such
assemblies are made up of devices defined in 1.101 and are designed, tested and supplied
for use as a single unit. The interaction between devices may be due to proximity, sharing of
components or a combination of both. The assemblies may contain components of air
insulated switchgear (AIS) only or a combination of AIS and gas insulated switchgear (GIS),
so called mixed technology switchgear (MTS) and may be delivered entirely prefabricated or
partially assembled.
It is not possible to define all potential arrangements of compact switchgear assemblies
however four examples are shown for information in Annex A.
These compact switchgear assemblies are for indoor and/or outdoor installations in systems
having rated voltages above 52 kV and service frequencies of 50 Hz and 60 Hz.
This standard covers the influence on performance of the interactions between devices within
compact switchgear assemblies and defines ratings and test procedures for these assemblies.
IEC 62271-1 is applicable if not stated otherwise.
This standard does not apply to switchgear assemblies consisting solely of GIS which are
covered by 62271-203.
1.101 Objective
The objective of this standard is to respond to the increasing use of compact switchgear
assemblies that perform the functions of a number of separate devices and their controlgear.
Numerous arrangements are possible and this standard provides guidance on basic types of
assemblies which might be envisaged.
As there are potential interactions between devices within such assemblies, it is necessary to
consider the standardization requirements for the assembly in its entirety.
The devices, defined by IEC standards, which may form part of a compact switchgear
assembly are listed below:
62271-205 © IEC:2008 – 7 –
Switching devices:
• Circuit-breakers  IEC 62271-100
• Disconnectors/Earthing switches IEC 62271-102
• Switches  IEC 60265-2
• Disconnecting circuit-breakers IEC 62271-108
Devices:
• Instrument transformers
– Current transformers IEC 60044-1, IEC 60044-8
– Voltage transformers IEC 60044-2, IEC 60044-5, IEC 60044-7
– Combined transformers IEC 60044-3
• Surge arresters  IEC 60099-4
• Bushings  IEC 60137
• Insulators   IEC 61462, IEC 62155
• Cable connections  IEC 62271-209
• Transformer connections IEC 61639
Each switching device, device and their controlgear forming part of a compact switchgear
assembly shall comply with the relevant individual standard. If part of the compact switchgear
assembly is formed by metal enclosed switchgear devices the requirements of IEC 62271-203
apply.
Compact switchgear assemblies, as defined in this standard, are considered to be a single
product with a single serial number and one set of documentation.
1.2 Normative references
The following referenced documents are indispensable for the application 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 60044-1, Instrument transformers – Part 1: Current transformers
IEC 60044-2, Instrument transformers – Part 2: Inductive voltage transformers
IEC 60044-3, Instrument transformers – Part 3: Combined transformers
IEC 60044-5, Instrument transformers – Part 5: Capacitor voltage transformers
IEC 60044-7, Instrument transformers – Part 7: Electronic voltage transformers
IEC 60044-8, Instrument transformers – Part 8: Electronic current transformers
IEC 60050-441, International Electrotechnical Vocabulary – Chapter 441: Switchgear,
controlgear and fuses
IEC 60099-4, Surge arresters – Part 4: Metal-oxide surge arresters without gaps for a.c.
systems
IEC 60137, Insulated bushings for alternating voltages above 1 000 V

– 8 – 62271-205 © IEC:2008
IEC 60265-2, High-voltage switches – Part 2: High-voltage switches for rated voltages of 52
kV and above
IEC 62271-209, High-voltage switchgear and controlgear – Part 209: Cable connections for
gas-insulated metal-enclosed switchgear for rated voltages above 52 kV – Fluid-filled and
extruded insulation cables – Fluid-filled and dry-type cable-terminations
IEC 61462, Composite hollow insulators – Pressurized and unpressurized insulators for use in
electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods,
acceptance criteria and design recommendations
IEC/TR 61639, Direct connection between power transformers and gas-insulated metal-
enclosed switchgear for rated voltages of 72,5 kV and above
IEC 61936-1, Power installations exceeding 1 kV a.c. – Part 1: Common rules
IEC 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in
electrical equipment with rated voltages greater than 1 000 V
IEC 62271-1, High-voltage switchgear and controlgear – Part 1:Common specifications
IEC 62271-100, High-voltage switchgear and controlgear – Part 100: High-voltage alternating-
current circuit-breakers
IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-108, High-voltage switchgear and controlgear – Part 108: High-voltage alternating
current disconnecting circuit-breakers for rated voltages of 72,5 kV and above
IEC 62271-203, High-voltage switchgear and controlgear – Part 203: Gas-insulated metal-
enclosed switchgear for rated voltages above 52 kV
2 Normal and special service conditions
Clause 2 of IEC 62271-1 is applicable.
3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 60050 (441), IEC 62271-1
and the publications mentioned in 1.2 apply.
3.1 General terms
3.1.101 connected position (of a removable part)
position of a removable part in which it is fully connected for its intended function
[IEV 441-16-25]
62271-205 © IEC:2008 – 9 –
3.1.102 disconnected position (of a withdrawable part)
position of a withdrawable part in which an isolating distance or segregation is established in
all the circuits of the withdrawable part, that part remaining mechanically attached to the
assembly
[IEV 441-16-28]
NOTE 1 The auxiliary circuits may not be disconnected in this position.
NOTE 2 This position may not be one in which it is safe to work on the withdrawn (moved) part.

3.2 Compact switchgear assembly
Subclause 3.2 of IEC 62271-1 is applicable with the following addition:
A compact switchgear assembly consists of at least one switching device directly connected
to, or sharing components with, one or more other devices such that there is an interaction
between the functions of the individual devices.
NOTE 1 A compact switchgear assembly may be mounted on one or more structures but it is only intended for
installation and operation as a single, complete unit.
NOTE 2 Interaction is the transfer of stresses (e.g. electrical, mechanical and thermal) between the individual
devices.
4 Rating
Clause 4 of IEC 62271-1 is partly applicable with the following distinctive features:
The rating of a compact switchgear assembly and its controlgear comprise the following :
a) rated voltage (U );
r
b) rated insulation level;
c) rated frequency (f );
r
d) rated normal current (l ) (for main circuits);
r
e) rated short-time withstand current (I ) (for main and earthing circuits);
k
f) rated peak withstand current (I ) (for main and earthing circuits);
p
g) rated duration of short-circuit (t );
k
and as applicable
h) rated values of the devices of the compact switchgear assembly, including their operating
devices (supply voltage and frequency), auxiliary and control equipment.
The ratings of the compact switchgear assembly shall be assigned to ensure that operation of
the assembly within its assigned ratings does not expose any individual device to conditions
which are outside its rated capabilities.
)
4.1 Rated voltage (U
r
Subclause 4.1 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly shall be demonstrated to be suitable for the rated voltage.
NOTE 1 Devices forming part of the compact switchgear assembly may have individual values of rated voltage in
accordance with the relevant standards.

– 10 – 62271-205 © IEC:2008
NOTE 2 For the purposes of this standard, the rated voltage (U ) defined in IEC 62271-1 is the rated voltage of
r
the compact switchgear assembly (U ).
r
4.2 Rated insulation level
Subclause 4.2 of IEC 62271-1 and the standards relevant to the components are applicable
with the following addition:
The compact switchgear assembly shall be demonstrated to be suitable for the rated
insulation level.
4.3 Rated frequency (f )
r
Subclause 4.3 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly shall be demonstrated to be suitable for the rated
frequency.
4.4 Rated normal current (I ) and temperature rise
r
Subclause 4.4 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly and its connections in the main current path shall be
demonstrated to be suitable for the rated normal current.
4.5 Rated short-time withstand current (I )
k
Subclause 4.5 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly and its connections in the main current path and the
earthing switches shall be demonstrated to be suitable for the rated short-time withstand
current.
4.6 Rated peak withstand current (I )
p
Subclause 4.6 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly and its connections in the main current path and the
earthing switches shall be demonstrated to be suitable for the rated peak withstand current.
4.7 Rated duration of short circuit (t )
k
Subclause 4.7 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly and its connections in the main current path and the
earthing switches shall be demonstrated to be suitable for the rated duration of short-circuit.
4.8 Rated supply voltage of closing and opening devices and of auxiliary
and control circuits (U )
a
Subclause 4.8 of IEC 62271-1 and the standards relevant to the devices are applicable.
4.9 Rated supply frequency of closing and opening devices and of auxiliary circuits
Subclause 4.9 of IEC 62271-1 and the standards relevant to the devices are applicable.

62271-205 © IEC:2008 – 11 –
5 Design and construction
Clause 5 of IEC 62271-1 is applicable with the following addition, unless stated otherwise.
The design of compact switchgear assemblies shall take into account the possible
interactions (e.g. electrical, mechanical and thermal) in the performance of the different
devices.
In addition to the common clauses listed below, all devices which are part of the compact
switchgear assembly shall conform to the design requirements of their relevant IEC
standards.
5.3 Earthing of switchgear and controlgear
Subclause 5.3 of IEC 62271-1 is applicable with the following addition:
5.101 Earthing of compact switchgear assemblies and their controlgear
The compact switchgear assembly shall have either a common earthing terminal or each
device shall have its own earthing terminal.
5.101.1 Earthing of the main circuit compact switchgear assemblies
To ensure safety during maintenance, all parts of the main circuit to which access is required
or provided shall be capable of being earthed.
Earthing may be made by
a) earthing switches;
b) temporary connections.
5.102 Pressure relief devices
Any pressure relief device shall be designed to minimize the danger to an operator carrying
out normal operations on the compact switchgear assembly.
5.10 Nameplates
Subclause 5.10 of IEC 62271-1 is applicable with the following addition:
A common nameplate shall be provided to identify the compact switchgear assembly. It shall,
as a minimum, detail the ratings listed in Clause 4 of this standard. The common nameplate
shall be clearly readable from the position of local operation side.
For each individual device, a nameplate according to its relevant standard is required where
ratings are not detailed on the common nameplate.
5.12 Position indication
Subclause 5.12 of 62271-1 is applicable with the following additions:
Each position indicator shall clearly indicate the switching device to which it belongs.
5.103 Locking devices for maintenance operation
All switching devices which are intended to be used for earthing purposes shall be lockable in
the closed position.
– 12 – 62271-205 © IEC:2008
NOTE Temporary locking of circuit-breakers in a closed position prevents the short-circuit interruption function
and should be used only when alternative protection is provided.
5.104 Movement of pressurized devices
All pressurized devices designed to be moved during normal operation must maintain their
original functionality.
NOTE This applies typically to devices such as withdrawable or rotating circuit-breakers, etc.
5.105 Isolating distance for maintenance
Access for maintenance of a compact switchgear assembly may be different from that of a
conventional bay in a substation due to the close proximity of the devices. Compact
switchgear assemblies should be designed taking account of the guidance presented in
IEC 61936-1 for personal protective measures.
6 Type tests
Clause 6 of IEC 62271-1 and the relevant type-test clauses of the individual standards of the
devices as appropriate to the compact switchgear assembly are applicable, unless stated
otherwise.
6.1 General
Subclause 6.1 of IEC 62271-1 is applicable with the following addition:
The aim of the type tests on the compact switchgear assembly is to demonstrate the
characteristics of the assembly in its entirety. For a compact switchgear assembly made up of
separately type-tested single devices the required tests on the assembly are listed in Table
101.
Table 101 – Type tests on the compact switchgear assembly
Type test Subclause
Dielectric tests 6.2
Radio interference voltage (r.i.v.) test 6.3
Measurement of the resistance of the main circuits 6.4.1
Temperature rise tests 6.5
Short-time withstand and peak withstand current test 6.6
Mechanical and environmental tests 6.101
If individual devices have not been separately type-tested they may be type-tested in the
compact switchgear assembly according to their relevant standards. Care should be taken to
avoid undue stress on other devices of the assembly. On switching devices of compact
switchgear assemblies maintenance between the individual type tests is permitted.
NOTE An individual type test need not be repeated for a design modification, if the manufacturer can demonstrate
that this change does not influence the result of that individual type test on the compact switchgear assembly.
Compact switchgear assemblies may consist of various devices in numerous arrangements
and it is not possible to define the test conditions for each arrangement. Four examples are
shown for information only in Clause AA.3, Figures AA.1, AA.2, AA.3 and AA.4.
As far as practicable, type tests shall be made on the complete compact switchgear
assembly. When testing of a complete compact switchgear assembly is not practicable due to
test plant limitations, partial combinations of devices may be tested provided that the potential
interaction between all devices is tested.

62271-205 © IEC:2008 – 13 –
When tests are made on partial combinations of devices, the manufacturer shall prove that
the stresses on each device during the tests are not less than those applied to the same
device when the entire compact switchgear assembly is tested. The influence of the missing
components shall be considered.
6.1.1 Grouping of tests
Subclause 6.1.1 of IEC 62271-1 is applicable for the assembly with the following addition:
Where the individual devices of the compact switchgear assembly are to be tested separately
or have been previously tested as allowed in this subclause, then the number of samples is as
required by the relevant individual standards. One additional sample of each device may be
used for the tests on the complete compact switchgear assembly, including any additional
environmental or pollution testing.
6.1.3 Information to be included in type-test reports
Subclause 6.1.3 of IEC 62271-1 is applicable with the following addition:
– where a compact switchgear assembly is tested, the identification, including serial
numbers as appropriate, of all devices of the compact switchgear assembly, shall be
recorded together with the identification of the compact switchgear assembly itself;
– details of the mechanical and electrical connection of the tested compact switchgear
assembly to the other parts of the test circuit;
– information on the mounting arrangements used.
6.2 Dielectric tests
6.2.101 Conditions of compact switchgear assemblies during dielectric tests
If the design of the compact switchgear assembly is such that the disconnecting function can
be located in different positions for various service applications, the number of test conditions
must be adapted to cover all of the different configurations.
Surge arresters may be replaced by a dielectrically equivalent mock-up.
Current transformer secondaries shall be short-circuited and earthed during dielectric tests.
Voltage transformers may be represented by a dielectrically equivalent replica to avoid
saturation of the magnetic circuit of the device when testing the combination.
NOTE Voltage transformers can remain connected for the test when saturation of the voltage transformer is
prevented, e.g. by using voltage transformers which are designed for the test voltage or by performing the power
frequency testing at a frequency, where saturation does not occur.
When performing tests with the increased voltage for the isolating distance undue stress on
other devices of the compact switchgear assembly shall be avoided.
When performing dielectric tests connected devices may be subjected to a higher number of
tests as specified for the individual device. The additional tests will not affect the criteria to
pass the tests of these devices (see 6.2.4 of IEC 62271-1,)
6.3 Radio interference voltage (r.i.v.) test
Subclause 6.3 of IEC 62271-1 is applicable with the following addition:
The compact switchgear assembly shall be tested with all switching devices closed and
separately with each individual switching device open.

– 14 – 62271-205 © IEC:2008
NOTE When all switchgear of the main current path is closed then the earthing switch(es) must be open.
6.4 Measurement of the resistance of circuits
6.4.1 Main circuit
Subclause 6.4.1 of IEC 62271-1 is applicable with the following addition:
Measurements shall be made of the resistance of the main circuit of the compact switchgear
assembly and of all individual devices that are part of the main circuit, and which have
accessible terminations when mounted in the compact switchgear assembly.
NOTE This enables the results to be used by the manufacturer in support of the values and tolerances declared
for compact switchgear assemblies of the same type when subjected to routine tests.
The results of the measurements shall be included in the test report and shall include a
detailed description of the points of measurements.
6.5 Temperature-rise tests
6.5.2 Arrangement of the equipment
Subclause 6.5.2 of IEC 62271-1 is applicable with the following addition:
The temperature-rise test shall, in principle, be performed on a complete compact switchgear
assembly to ensure that the influence of all devices is represented.
If temperature-rise tests have been performed previously on individual devices, it is sufficient
to only measure the temperature at the terminals of the device during a temperature-rise test
on the assembly providing that the following conditions are met:
– the test current is not higher than the value tested with the individual device;
– the temperature-rise measured at the terminals of the individual device does not exceed
the maximum value measured during the type test of the individual device.
Due to limitations of the test laboratory, it may not be possible to perform the test on the
complete compact switchgear assembly or on a complete pole. In such cases, tests may be
performed on combinations of devices thermally equivalent for the current path of the
compact switchgear assembly. As indicated above, care should be taken when interpreting
the relevance of the test results of such tests.
6.6 Short-time withstand current and peak withstand current tests
6.6.1 Arrangement of the switchgear and controlgear and of the test circuit
Subclause 6.6.1 of IEC 62271-1 is applicable with the following addition:
The short-time withstand current and peak withstand current test shall be performed on a
complete compact switchgear assembly.
The physical arrangement and the connections to the complete compact switchgear assembly
shall be as intended to be used.
Due to limitations of the test laboratory, it may not be possible to perform the test on the
complete compact switchgear assembly or on a complete pole. In such cases, the tests may
be performed on sections of the compact switchgear assembly with overlapping devices on
each side such that all interactions between adjacent devices are tested.
If current transformers have previously been tested in accordance with the relevant product
standard then only the primary part needs to be present for these tests. The mechanical

62271-205 © IEC:2008 – 15 –
support of the current and voltage transformers have to be present for this test as far they are
submitted to the electrodynamic forces.
6.6.4 Conditions of switchgear assembly after test
Subclause 6.6.4 of IEC 62271-1 is applicable with the following addition:
6.6.4.101 Conditions of compact switchgear assembly after test
Devices which are part of the main circuit shall meet their relevant standards with respect to
criteria to pass the tests.
After the test, the compact switchgear assembly shall show no significant deterioration and
shall be capable of operating normally, carrying its rated normal current continuously without
exceeding the temperature-rise limits specified in IEC 62271-1, Table 3, and withstanding the
voltage specified for the dielectric tests.
6.101 Mechanical and environmental tests
6.101.1 Miscellaneous provisions for mechanical and environmental tests
Mechanical and environmental tests shall be performed on all switching devices that form part
of the compact switchgear assembly. Each separate device test shall be performed in
accordance with the relevant individual standard. In principle, the tests should be performed
on the compact switchgear assembly, to ensure that the influence of all elements is
represented, unless it is proven that there is no interaction between the individual devices.
The tests on individual switching devices may be performed in accordance with different
mechanical endurance classes as long as each switching device is assigned to the relevant
class and the nameplate and test reports record these classes. If two or more identical
switching devices are incorporated into the compact switchgear assembly (for example, two
disconnectors), the tests may be performed on only one of these devices, provided that the
adjacent devices are the same, the interaction and common components shared between
adjacent devices are the same and the devices are identical in construction, linkage system,
position, terminal connection and use the same type of operating device.
The tests may be performed on a single pole providing that the test stresses are no more
favourable than testing the complete multipole assembly, that each pole is actuated by a
separate operating mechanism(s) and that each pole is mounted on its own independent
support(s).
If a switching device is mechanically integrated with another, e.g. a combination as given in
Figure AA.3 in which a circuit-breaker is mechanically integrated into the disconnecting
function, the mechanical and environmental tests shall be performed on the complete
combination.
When a circuit-breaker is a withdrawable unit, which uses the space between the fixed
terminals and the circuit-breaker terminals as the isolating distance (disconnecting function),
separate mechanical operation tests shall be performed on the circuit-breaker and on the
disconnecting function in accordance with the relevant device standards.
When a circuit-breaker creates the isolating distance (disconnecting function) by rotation of
the complete circuit-breaker, separate mechanical operation tests shall be performed on the
circuit-breaker and on the disconnecting function in accordance with the relevant device
standards.
The condition of the auxiliary and control equipment of the compact switchgear assembly
during and after the mechanical and environmental tests shall be in accordance with
6.101.1.5 of IEC 62271-100.
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6.101.2 Mechanical operation tests at ambient temperature
Mechanical operation tests at ambient air temperature are applicable to circuit-breakers,
disconnecting circuit-breakers, switches, disconnectors (or disconnecting functions) and
earthing switches in accordance with their relevant standards. The mechanical verification
tests specified for each switching device shall be done after all the mechanical operation tests
have been finished. The condition of all other devices shall be verified in accordance with the
related product standards, see 1.101.
All switching devices fitted with interlocks shall be submitted to 50 operating cycles in order to
check the operation of the associated interlocks. Before each operation the interlocks shall be
set in the position intended to prevent the operation of the switching devices and one attempt
shall then be made to operate each switching device. During these tests only normal
operating forces shall be employed and no adjustment shall be made to the switching devices
or interlocks.
6.101.3 Low and high temperature tests
Low and high temperature tests are applicable to circuit-breakers, disconnecting circuit-
breakers, switches, disconnectors (or disconnecting functions) and earthing switches in
accordance with their relevant standards.
Devices such as current transformers, voltage
...