IEC 62505-1:2016

IEC 62505-1 ®
Edition 2.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Railway applications – Fixed installations – Particular requirements for AC
switchgear –
Part 1: Circuit-breakers with nominal voltage above 1 kV

Applications ferroviaires – Installations fixes – Exigences particulières pour
appareillage à courant alternatif –
Partie 1: Disjoncteurs avec tension nominale supérieure à 1 kV

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IEC 62505-1 ®
Edition 2.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Railway applications – Fixed installations – Particular requirements for AC

switchgear –
Part 1: Circuit-breakers with nominal voltage above 1 kV

Applications ferroviaires – Installations fixes – Exigences particulières pour

appareillage à courant alternatif –

Partie 1: Disjoncteurs avec tension nominale supérieure à 1 kV

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 45.060 ISBN 978-2-8322-3164-7

– 2 – IEC 62505-1:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 8
4 Service conditions[2] . 9
5 Rating  [4] . 9
5.1 General . 9
5.2 Nominal voltage (U ) . 9
n
5.3 Rated voltage (U ) . 9
Ne
5.4 Insulation coordination . 9
5.4.1 General . 9
5.4.2 Rated insulation level[4.2] . 10
5.5 Rated frequency [4.3] . 11
5.6 Rated supply voltage of closing and opening devices and auxiliary and
control circuits (U )[4.8] . 11
a
5.7 Rated short-circuit breaking current (I )[4.101] . 11
SC
5.8 Transient recovery voltage (TRV) related to the rated short-circuit breaking
current[4.102] . 11
5.8.1 General . 11
5.8.2 Representation of TRV[4.102.2]. 11
5.8.3 Standard values of TRV related to the rated short-circuit breaking
current[4.102.3] . 11
5.8.4 Standard values of initial transient recovery voltage[4.102.4] . 13
5.9 Rated short-circuit making current[4.103] . 13
5.10 Rated operating sequence[4.104] . 13
5.11 Characteristics for short line faults[4.105] . 13
5.12 Rated out-of-phase breaking current[4.106] . 13
5.13 Rated capacitive switching currents[4.107] . 13
5.14 Number of mechanical operations[4.110] . 14
6 Design and construction[5] . 14
6.1 General . 14
6.2 Nameplates[5.10] . 14
6.3 Creepage distances[5.14] . 15
6.4 Electromagnetic compatibility (EMC)[5.18] . 15
7 Type tests[6] . 15
7.1 General . 15
7.2 Dielectric tests[6.2] . 15
7.2.1 General . 15
7.2.2 Power-frequency voltage tests[6.2.6.1] . 15
7.2.3 Lightning impulse voltage tests[6.2.6.2] . 15
7.2.4 Artificial pollution tests[6.2.8] . 15
7.2.5 Voltage test as a condition check[6.2.11] . 16
7.3 Electromagnetic compatibility (EMC) tests[6.9] . 16
7.4 Mechanical and environmental tests[6.101] . 16
7.4.1 General . 16

7.4.2 Low and high temperature tests[6.101.3] . 16
7.5 Miscellaneous provisions for making and breaking tests[6.102] . 16
7.5.1 General . 16
7.5.2 General requirements on tests[6.102.1] . 16
7.5.3 Arrangement of circuit-breaker for tests[6.102.3] . 17
7.5.4 General considerations concerning test methods[6.102.4] . 17
7.5.5 Synthetic tests[6.102.5] . 17
7.5.6 No-load operations before tests[6.102.6] . 17
7.5.7 Behaviour of circuit-breaker during tests[6.102.8] . 17
7.5.8 Circuit-breaker with short arcing times[6.102.10] . 17
7.6 Test circuit for short circuit making and breaking tests[6.103] . 19
7.6.1 General . 19
7.6.2 Frequency[6.103.2] . 19
7.6.3 Earthing of test circuit[6.103.3] . 19
7.7 Short-circuit test quantities[6.104] . 19
7.7.1 General . 19
7.7.2 Applied voltage before short-circuit making tests[6.104.1] . 19
7.7.3 Short-circuit making current[6.104.2] . 19
7.7.4 Transient recovery voltage (TRV) for terminal fault test[6.104.5] . 20
7.7.5 Test-duties OP1 and OP2[6.104.5.6] . 21
7.7.6 Power frequency recovery voltage[6.104.7] . 21
7.8 Basic short-circuit test-duties[6.106] . 22
7.9 Single-phase and double-earth fault tests[6.108] . 22
7.10 Short-line fault tests[6.109] . 22
7.11 Out-of-phase making and breaking tests[6.110] . 22
7.12 Capacitive current switching tests[6.111] . 22
7.12.1 General . 22
7.12.2 Test voltage[6.111.7] . 23
7.12.3 Test with specified TRV[6.111.10] . 23
8 Routine tests[7] . 23
9 Guidance to the selection of circuit-breakers for service[8] . 23
10 Information to be given with enquiries, tenders and orders[9] . 23
11 Rules for transport, storage, installation, operation and maintenance[10] . 24
12 Safety [11] . 24
13 Influence of the product on the environment[12] . 24
Bibliography . 25

Table 1 – Nominal voltages (U ), rated impulse voltages (U ) and short-duration
n Ni
power-frequency withstand voltage U for circuits connected to the contact line . 10
d
Table 2 – Standard values of transient recovery voltage – Representation by two
parameters . 12
Table 3 – Preferred values of rated capacitive switching currents . 14
Table 4 – Mechanical endurance classes . 14
Table 5 – Standard values of prospective transient recovery voltage – Representation
by two parameters . 21
Table 6 – Specified values U , t , U and t . 23
1 1 c 2
– 4 – IEC 62505-1:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS – FIXED INSTALLATIONS –
PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –

Part 1: Circuit-breakers with nominal voltage above 1 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
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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 62505-1 has been prepared IEC technical committee 9: Electrical
equipment and systems for railways.
This standard is based on EN 50152-1.
This second edition cancels and replaces the first edition issued in 2009. It constitutes a
technical revision.
The main technical changes with regard to the previous edition are as follows:
This standard was revised to reflect the latest versions of standards referenced and to remove
text already included in the IEC 62271 series. The scope was extended to include single-pole
and two-pole circuit-breakers. Definitions were added to provide the necessary precision and
to meet the needs of railway applications. Table 1 was reworked according to the changes of
IEC 62497-1:2010, Table A.2 and Table B.1. Standard values of transient recovery voltage

have been taken from different tables to one, Table 2. Ratings of mechanical endurance
previously given under the clause ‘type tests’ were moved to the new Table 4 ‘Mechanical
endurance classes’. Standard values of prospective transient recovery voltage have been
taken from different tables to one, Table 5. Table 6 ‘Coordination table of rated values for
circuit-breakers’ of the previous version was removed.
The text of this standard is based on the following documents:
FDIS Report on voting
9/2097/FDIS 9/2133/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 parts of IEC 62505 series, under the general title Railway applications – Fixed
installations – Particular requirements for a.c. switchgear, 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 website 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 – IEC 62505-1:2016 © IEC 2016
INTRODUCTION
The IEC 62505 series under the generic title Railway applications – Fixed installations –
Particular requirements for a.c. switchgear, is divided as follows:
Part 1: Circuit-breakers with nominal voltage above 1 kV.
Part 2: Disconnectors, earthing switches and switches with nominal voltage above 1 kV.
Part 3-1: Measurement, control and protection devices for specific use in a.c. traction
systems – Application guide.
Part 3-2: Measurement, control and protection devices for specific use in a.c. traction
systems – Single-phase current transformers.
Part 3-3: Measurement, control and protection devices for specific use in a.c. traction
systems – Single-phase inductive voltage transformers.
IEC 62505-1 has to be used in conjunction with IEC 62271-1:2007 and IEC 62271-100:2008
and its Amendment 1:2012.
References in subclauses of IEC 62271-1:2007 and IEC 62271-100:2008 need to be replaced
by references to applicable subclauses in this standard as far as reasonably possible.
Where a particular clause of IEC 62271-1:2007 or IEC 62271-100:2008 is not mentioned in
this standard, that clause applies as far as reasonable. Where requirements relate exclusively
to three-phase systems or to voltages outside those in use in traction systems, they are not
applicable. Where this standard states "addition" or "replacement", the relevant text of
IEC 62271-1:2007 and IEC 62271-100:2008 needs to be adapted accordingly.
The numbering of clauses in the IEC 62271 series is not used in this Standard. The
numbering in square brackets refers to the numbering of clauses in IEC 62271.
Where terms defined in IEC 62271-1:2007 and IEC 62271-100:2008 conflict with definitions of
the same terms as given in IEC 60050-811:1991 or of the other railway applications
documents listed in the normative references, the definitions in IEC 62271-1:2007 and
IEC 62271-100:2008 need to be used.
NOTE The suffix N which appears in this Standard for rated values is not present in IEC 62271-100.

RAILWAY APPLICATIONS – FIXED INSTALLATIONS –
PARTICULAR REQUIREMENTS FOR AC SWITCHGEAR –

Part 1: Circuit-breakers with nominal voltage above 1 kV

1 Scope
This part of IEC 62505 is applicable to single-pole and two-pole alternating current (a.c.)
circuit-breakers which are:
• designed for indoor or outdoor fixed installations in tractions systems, and
• operated with an a.c. line voltage and frequency as specified in IEC 60850:2014.
NOTE 1 IEC 60850 specifies the a.c. traction systems:
15 kV 16,7 Hz,
12 kV 25 Hz,
12,5 kV, 20 kV also 25 kV with 50 Hz and
12,5 kV, 20 kV, 25 kV also 50 kV with 60 Hz.
NOTE 2 As rails of a.c. traction systems are typically connected to earth and included in the return current path
all phase to earth voltages will be within the tolerances as specified in IEC 60850. Nevertheless phase to phase
voltages are sometimes higher, e.g. in autotransformer systems.
This Standard is also applicable to the operating devices of circuit-breakers and to their
auxiliary equipment.
This Standard does not address circuit-breakers with dependent manual operating
mechanism.
NOTE 3 It is impossible to specify a short-circuit making current for these circuit-breakers and it is likely that such
dependent manual operation is not meeting safety considerations.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60850:2014, Railway applications – Supply voltages of traction systems
IEC 62236-5:2008, Railway applications – Electromagnetic compatibility – Part 5: Emission
and immunity of fixed power supply installations and apparatus
IEC 62271-1:2007, High-voltage switchgear and controlgear – Part 1: Common specifications
NOTE IEC 62271-1 A1:2011 is not referenced. It refers to voltage levels beyond those used in railway systems.
IEC 62271-100:2008, High-voltage switchgear and controlgear – Part 100: Alternating-current
circuit-breakers
Amendment 1:2012
IEC 62497-1:2010, Railway applications – Insulation co-ordination – Part 1: Basic
requirements – Clearances and creepage distances for all electrical and electronic equipment
Amendment 1:2013
– 8 – IEC 62505-1:2016 © IEC 2016
IEC 62498-2:2010, Railway applications – Environmental conditions for equipment – Part 2:
Fixed electrical installations
IEC 62505-2:2016, Railway applications – Fixed installations – Particular requirements for a.c.
switchgear – Part 2: Disconnectors, earthing switches and switches with nominal voltage
above 1 kV
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62271-1:2007 and
IEC 62271-100:2008, as well as the following apply:
NOTE The index of definitions is the same as in 3.8 of IEC 62271-100:2008, but amended according to the
definitions below.
3.1
single-pole circuit-breaker
circuit-breaker with one electrically separated conducting path for the main circuit suitable for
use in a single phase circuit
3.2
two-pole circuit-breaker
circuit-breaker with two independent electrically separated conducting paths for the main
circuit
Note 1 to entry: In some cases the two paths are connected in series for use in a single-phase circuit where the
establishment and the seperation of the two paths are simultaneous.
3.3
nominal voltage
U
n
suitable approximate voltage value used to designate or identify a given supply system
Note 1 to entry: This value is also assigned to the circuit-breaker to show its usability in the supply system.
Note 2 to entry: An AT-System which is supplied with 2 phases, having a phase shift of 180° between them, is
commonly named 2 × U according to the U supplied to the catenary system.
n n
[SOURCE: IEC 62497-1:2010, 3.4.1]
3.4
rated voltage
U
ne
value of voltage assigned by the manufacturer to the equipment or part of it and to which
operating and performance characteristics are referred
Note 1 to entry: This value is also used to determine its dielectric characteristics and will be used instead of the
rated insulation voltage (U ) as defined and used in IEC 62497-1.
Nm
Note 2 to entry: The abbreviation Ur is not used for railway circuit-breakers.
[SOURCE: IEC 62497-1:2010, 3.4.3, modified: "to a component, device or equipment"
replaced by "equipment or part of it"]
3.5
Over Voltage category
OV
classification of the circuit protection against internal and external overvoltages

3.6
Pollution Degree
PD
classification of the pollution to be considered due to the micro climate
4 Service conditions [2]
Clause 2 of IEC 62271-1:2007 is applicable except as follows:
The preferred values of minimum ambient air temperature under normal service conditions for
indoor circuit-breakers are –5 °C, –15 °C and –25 °C.
NOTE 1 These values are the same as in IEC 62271-1.
The typical value for indoor circuit-breakers is –5 °C. Nevertheless it needs to be considered
that more severe conditions could occur in rare cases and equipment design is most likely
similar to outdoor equipment.
For special service conditions, agreement shall be made between purchaser and supplier.
IEC 62498-2:2010 should be taken as guidance to select appropriate classifications.
NOTE 2 The altitude reference of IEC 62497-1 (up to 2 000 m) applies to insulation coordination only and is not
considered in this standard.
5 Rating  [4]
5.1 General
Clause 4 of IEC 62271-100:2008 is applicable except as noted in 5.2 to 5.14 below.
5.2 Nominal voltage (U )
n
The nominal voltage U shall be one of the a.c. voltages listed in Table 1 or Table B.1 of
n
IEC 60850:2014.
5.3 Rated voltage (U )
Ne
Subclause 4.1 of IEC 62271-1:2007 is replaced by the following:
The rated voltage U shall be chosen taking into consideration the maximum voltage level
Ne
suitable to be permanently applied to the circuit-breaker (i.e. highest permanent voltage
U as defined in IEC 60850:2014).
max1
The value of U shall be used whenever IEC 62271-1:2007 or IEC 62271-100:2008 make
Ne
reference to U unless another value is named explicitly.
r
NOTE 1 The insulation characteristics determined by applying U are expected to be suitable to allow the
max1
highest non-permanent voltage U taken from IEC 60850.
max2
NOTE 2 The rated voltage for fixed installations in railway applications is a phase to earth value.
5.4 Insulation coordination
5.4.1 General
Insulation coordination shall be conducted according to IEC 62497-1:2010 e.g. selection of
values for overvoltage category (OV) and pollution degree (PD).

– 10 – IEC 62505-1:2016 © IEC 2016
The rated voltage U shall be used when IEC 62497-1:2010 refers to the rated insulation
Ne
voltage U .
Nm
The definition of the four overvoltage categories shall be as in IEC 62497-1:2010, 4.2.3.2.
The definition of the seven pollution degrees shall be as in IEC 62497-1:2010, 4.4 and
Table A.4.
5.4.2 Rated insulation level [4.2]
Subclause 4.2 of IEC 62271-1:2007 is applicable except as follows:
The value of the rated impulse withstand voltage U and of the power-frequency withstand
Ni
voltage U shall be as given in Table 1, taken from the values listed in IEC 62497-1:2010.
d
Table 1 – Nominal voltages (U ), rated impulse voltages (U ) and short-duration
n Ni
power-frequency withstand voltage U for circuits connected to the contact line
d
U U OV U U
n Ne Ni d
(1,2/50 µs)
kV kV kV kV
IEC 60850:2014 IEC 62497-1:2010
a b
3 95 38
17,25
4 125 50
a
3 145 70
c
17,25
b
4 170 70
3 125 50
d d
20 24
e e
4 150 50
b
3 170 70
27,5
4 200 95
3 200 95
c
27,5
25 4 250 95
b
3 170 70
d
e
4 200 70
d, f
30 4 325 140
NOTE The rated short-duration power-frequency withstand voltage is represented by U as used in
d
IEC 62271-1 not by U as used in IEC 62497- 1. U is used in IEC 62271-1 for the rated auxiliary voltage.
a a
a
Not commonly used.
b
Values taken from Table 1a of IEC 62271-1:2007 as being well-established practice.
c
For higher requirements on insulation system.
This is common practice in some countries with larger number of installations at altitude up to 2 000 m
without additionally applying an altitude correction factor.
d
Values taken from table B.1 of IEC 60850:2014.
e
Values taken from experience and being well-established practice.
f
For higher requirements on insulation in systems with a phase shift of 180°.
Increased test voltages could be favourable for these terminals (e. g. between phases of an AT-system with
U = 25 kV).
n
In special cases isolation may be requested across the open breaking contacts. In this case
values shall be selected from IEC 62505-2:2016, Table 1.
All test voltages for dielectric tests on the main circuit shall be taken from Table 1.

5.5 Rated frequency [4.3]
Subclause 4.3 of IEC 62271-1:2007 is applicable.
5.6 Rated supply voltage of closing and opening devices and auxiliary and control
circuits (U ) [4.8]
a
Subclause 4.8 of IEC 62271-1:2007 is applicable with the following addition.
The relative tolerance as specified in 4.8.3 of IEC 62271-1:2007 does not apply to a.c. power
supplies fed from a transformer connected to the traction line voltage. This tolerance shall be
agreed upon between purchaser and supplier.
NOTE In this case the relative tolerance of 4.8.3 of IEC 62271-1:2007 will not be sufficient due to the high
fluctuation of the traction line voltage.
5.7 Rated short-circuit breaking current (I ) [4.101]
SC
Subclause 4.101 of IEC 62271-100:2008 is applicable except as follows:
The transient recovery voltage shall equal to the value specified in 5.8 of this standard.
The reference in paragraph b) shall be to 5.12 of this standard.
Only the standard value of 45 ms for the d.c. time constants is used for railway applications.
5.8 Transient recovery voltage (TRV) related to the rated short-circuit breaking
current [4.102]
5.8.1 General
Subclause 4.102 of IEC 62271-100:2008 is applicable except as follows:
Reference to short circuit breaking current shall be to 5.7 in this standard.
5.8.2 Representation of TRV [4.102.2]
Subclause 4.102.2 of IEC 62271-100:2008 is applicable except as follows:
a) not applicable;
b) the formula is
u k × k × U √2 for U = 12 kV or 12,5 kV
c = af pp n n
u k × k × U √2 for U = 17,25 kV or 27,5 kV
c = af pp max2 max1
k × k × U √2 for U = 20 kV
u
c = af pp n n
u k × k × U √2 for U = 30 kV
c = af pp max1 max1
d) not applicable.
5.8.3 Standard values of TRV related to the rated short-circuit breaking current
[4.102.3]
Subclause 4.102.3 of IEC 62271-100:2008 shall be replaced by the following:
Standard values of TRV are given in Table 2.
The table also indicates values of rate of rise, taken as u /t , which together with TRV peak
c 3
values u may be used for purposes of specification of TRV.
c
– 12 – IEC 62505-1:2016 © IEC 2016
The values given in the table are prospective values. They apply to railway circuit-breakers in
traction systems consisting of transformers, lines and cables.
Where a circuit-breaker has to operate under more severe conditions of TRV than those in
Table 2, these shall be identified in the purchaser's specification.
NOTE More severe conditions apply e.g. to circuit-breakers connected to capacitor banks.
Table 2 – Standard values of transient recovery voltage –
Representation by two parameters
Nominal Maximum Maximum Type of First- Ampli- TRV Time Time Voltage Time RRRV
voltage permanent non- test pole-to tude peak delay
voltage permanent clear- factor value
voltage factor
a a
U U U k K u t t u’ t’ u /t
n max1 max2 pp af c 3 d c 3
kV kV kV p.u. p.u. kV µs µs kV µs kV/µs
Terminal
1 1,4 25 91 14 8,4 44 0,27
fault
Out-of-
also N/A N/A 1,73 1,25 38 182 28 12,7 89 0,21
phase 120°
12,5
Out-of-
2 1,25 44 182 28 14,7 89 0,24
phase 180°
Terminal
1 1,4 36 108 16,0 12 52 0,33
fault
Out-of-
15 17,25 18 1,73 1,25 55 216 32 18 104 0,25
phase 120°
Out-of-
2 1,25 64 216 32 21 104 0,30
phase 180°
Terminal
1 1,4 41 82 12,3 14 40 0,50
fault
Out-of-
20 24,0 N/A 1,73 1,25 61 164 24,6 20 80 0,37
phase 120°
Out-of-
2 1,25 70 164 24,6 23 80 0,43
phase 180°
Terminal
1 1,4 57 132 20,0 19 64 0,43
fault
Out-of-
25 27,5 29 1,73 1,25 88 264 40 29 128 0,33
phase 120°
Out-of-
2 1,25 102 264 40 34 128 0,39
phase 180°
Terminal
1 1,4 62 103 15,5 21 50 0,60
fault
Out-of-
25 30,0 N/A 1,73 1,25 92 206 31 31 100 0,45
phase 120°
Out-of-
2 1,25 106 206 31 35 100 0,51
phase 180°
a
See IEC 60850.
N/A not applicable.
NOTE 1 The formulae of 4.102.2 of IEC 62271-100:2008 have been used to determine the values in this table. The
conditions for class 1 circuit-breakers have been deemed most suitable for railway applications.
NOTE 2 The parameter k has been kept to make use of the formulae of IEC 62271-100:2008. However k in traction
pp pp
systems reflects the more severe voltage conditions from interconnection of supply systems with 120° or 180° phase shift.
NOTE 3 TRV values as specified in this table are sufficient to cover all likely conditions, including AT systems as phase
to earth faults are the large majority in this system.
NOTE 4 Out-of-phase 120° does not exist as normal operating condition in 15 kV railways.

5.8.4 Standard values of initial transient recovery voltage [4.102.4]
Subclause 4.102.4 of IEC 62271-100:2008 is not applicable.
5.9 Rated short-circuit making current [4.103]
Subclause 4.103 of IEC 62271-100:2008 is replaced by the following.
The rated short-circuit making current (see Figure 8 of IEC 62271-100:2008) of a circuit-
breaker is that which corresponds to the rated voltage, and shall be 2,5 times the r.m.s. value
of the a.c. component of its rated short-circuit breaking current (see 5.7).
5.10 Rated operating sequence [4.104]
Subclause 4.104 of IEC 62271-100:2008 is applicable with the following addition.
c) O – t’" – CO
where:
t’" = 60 s, for circuit-breakers used in conjunction with a line test system.
d) O – t’’" – CO
where
t’’" = 5 s, for 16,7 Hz circuit-breakers
e) same as a)
except where
t = 5 s and t’ = 60 s, for 16,7 Hz circuit-breakers
5.11 Characteristics for short line faults [4.105]
Subclause 4.105 of IEC 62271-100:2008 is not applicable.
NOTE This fault condition is covered by the values given for terminal faults in Table 2 of this standard.
5.12 Rated out-of-phase breaking current [4.106]
Subclause 4.106 of IEC 62271-100:2008 shall be replaced by the following.
The purchaser should identify if out-of-phase conditions apply. If so the purchaser shall
specify the out-of-phase making and breaking current for the system.
If rated out-of-phase making and breaking currents are assigned the following applies:
a) the power frequency recovery voltage shall be √3 × U for 120° conditions and 2 × U
Ne Ne
for 180° conditions;
b) the transient recovery voltage shall be as given in Table 2;
c) the rated out-of-phase breaking current shall be determined according to the maximum
possible failure current of the fault loop. The rated short circuit making current shall be the
crest value of the rated out-of-phase breaking current.
5.13 Rated capacitive switching currents [4.107]
Subclause 4.107 of IEC 62271-100:2008 is applicable except as follows:
Table 9 of IEC 62271-100:2008 shall be replaced by Table 3.

– 14 – IEC 62505-1:2016 © IEC 2016
Table 3 – Preferred values of rated capacitive switching currents
Line Cable Single capa- Back-to-back capacitor bank
citor bank
Nominal Rated line- Rated cable- Rated single Rated back-to- Rated back-to- Frequency of
voltage charging charging capacitor back capacitor back capacitor the inrush
breaking breaking breaking bank breaking bank inrush current
current current current current making current
U I I I I I f
n l c sb bb bi bi
kV, r.m.s. A, r.m.s. A, r.m.s. A, r.m.s. A, r.m.s. kA, peak Hz
12,5 50
15 10 200 200 20 4 250
The values given in this table are chosen for standardisation purposes. They are preferred values and cover the
majority of typical applications. If different values are needed, any appropriate value may be specified as a rated
value.
NOTE 1 For actual cases, the inrush currents can be calculated based on Annex H of IEC 62271-100:2008.
If back-to-back capacitor switching tests are performed, single capacitor bank switching tests are not required.
NOTE 2 The peak value of the inrush current and the inrush current frequency are under some conditions higher or
lower than the preferred values stated in Table 9 of IEC 62771-100:2012 depending on system conditions, for
example whether or not current limiting reactors are used.

5.14 Number of mechanical operations [4.110]
Subclause 4.110 of IEC 62271-100:2008 is applicable except as follows:
Values of mechanical endurance classes of switching devices shall be as given in Table 4.
Table 4 – Mechanical endurance classes
Mechanical endurance class Operating cycles
Class 1 2 000
Class 2 5 000
Class 3 10 000
NOTE Each operating cycle consists of one OPEN and one CLOSE operation.

6 Design and construction [5]
6.1 General
Clause 5 of IEC 62271-100:2008 is applicable except as follows below in 6.2 to 6.4.
6.2 Nameplates [5.10]
Subclause 5.10 of IEC 62271-100:2008 is applicable with the following exception:
The abbreviation of the rated voltage shall be U as defined in this standard.
Ne
6.3 Creepage distances [5.14]
Subclause 5.14 of IEC 62271-100:2008 is replaced by:
All creepage distances in air shall be based on the rated voltage U and determined
Ne
according to IEC 62497-1:2010, Clause 4.
Creepage distances other than in air are fixed by the manufacturer according to the insulation
system.
6.4 Electromagnetic compatibility (EMC) [5.18]
Subclause 5.18 of IEC 62271-100:2008 is applicable with the following exception:
Emission and immunity levels shall be taken from IEC 62236-5:2008.
7 Type tests [6]
7.1 General
Clause 6 of IEC 62271-100:2008 is applicable except as follows below in 7.2 to 7.12.
7.2 Dielectric tests [6.2]
7.2.1 General
Subclause 6.2 of IEC 62271-100:2008 is applicable except as follows.
7.2.2 Power-frequency voltage tests [6.2.6.1]
Subclause 6.2.6.1 of IEC 62271-100:2008 is applicable with the following addition:
Test voltages shall be in accordance with Table 1.
7.2.3 Lightning impulse voltage tests [6.2.6.2]
Subclause 6.2.6.2 of IEC 62271-100:2008 is applicable with the following addition.
The test voltage shall be in accordance with Table 1.
When the rated lightning impulse withstand voltage assigned to the open breaker is higher
than that assigned to the rest of the breaker the lightning impulse voltage te
...