EN 50152-1:2007

SLOVENSKI STANDARD
01-april-2008
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SIST EN 50152-1:1998
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Railway applications - Fixed installations - Particular requirements for a.c. switchgear --
Part 1: Single-phase circuit-breakers with Un above 1 kV
Bahnanwendungen - Ortsfeste Anlagen - Besondere Anforderungen an Wechselstrom-
Schalteinrichtungen -- Teil 1: Einphasen-Leistungsschalter mit Un über 1 kV
Applications ferroviaires - Installations fixes - Spécifications particulières pour
appareillage à courant alternatif -- Partie 1: Disjoncteurs monophasés avec Un supérieur
à 1 kV
Ta slovenski standard je istoveten z: EN 50152-1:2007
ICS:
29.130.99 Druge stikalne in krmilne Other switchgear and
naprave controlgear
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50152-1
NORME EUROPÉENNE
December 2007
EUROPÄISCHE NORM
ICS 29.280; 45.020 Supersedes EN 50152-1:1997

English version
Railway applications -
Fixed installations -
Particular requirements for a.c. switchgear -
Part 1: Single-phase circuit-breakers with U above 1 kV
n
Applications ferroviaires -  Bahnanwendungen -
Installations fixes - Ortsfeste Anlagen -
Spécifications particulières pour Besondere Anforderungen an
appareillage à courant alternatif - Wechselstrom-Schalteinrichtungen -
Partie 1: Disjoncteurs monophasés Teil 1: Einphasen-Leistungsschalter
avec U supérieur à 1 kV mit U über 1 kV
n n
This European Standard was approved by CENELEC on 2007-07-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50152-1:2007 E
Foreword
This European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport
equipment and ancillary apparatus (fixed installations), of Technical Committee CENELEC TC 9X, Electric
and electronic applications for railways.
This European Standard supersedes EN 50152-1:1997 and has been prepared taking into account the
changes that have been made in the high voltage switchgear and controlgear Standards of IEC TC 17 and in
EN 50124-1/A2:2005.
This document is technically equivalent to EN 50152-1:1997 except for the normative references which have
changed and the revised classification of rated insulation voltages according to Table A.2 of
EN 50124-1/A2:2005.
The text of the draft was submitted to the unique acceptance procedure and was approved by CENELEC as
EN 50152-1 on 2007-07-01.
The following dates were fixed:
− latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-07-01
− latest date by which the national Standards conflicting
with the EN have to be withdrawn (dow) 2010-07-01

- 3 - EN 50152-1:2007
Contents
Page
Introduction. 5
1 Scope . 6
2 Normative references . 6
3 Definitions. 6
4 Service conditions. 7
5 Rating. 7
5.1 General . 7
5.2 Rated voltage (U ). 8
Ne
5.3 Nominal voltage (U ). 8
n
5.4 Rated insulation voltage (U ) [4.2]. 8
Nm
5.5 Rated frequency [4.3]. 9
5.6 Rated normal current and temperature rise [4.4] . 9
5.7 Rated short-time withstand current [4.5]. 10
5.8 Rated peak withstand current [4.6]. 10
5.9 Rated duration of short-circuit [4.7] . 10
5.10 Rated supply voltage of closing and opening devices and auxiliary circuit [4.8]. 10
5.11 Rated supply frequency of closing and opening devices and auxiliary circuits [4.9]. 10
5.12 Rated pressures of compressed gas supply for operation and for interruption [4.10]. 10
5.13 Rated short-circuit breaking current (I ) [4.101]. 10
Nss
5.14 Rated transient recovery voltage for terminal faults [4.102]. 11
5.15 Standard values of initial transient recovery voltage [4.102.4]. 13
5.16 Rated short-circuit making current [4.103]. 13
5.17 Rated operating sequence [4.104] . 13
5.18 Rated out-of-phase breaking current [4.106] . 14
5.19 Rated line-charging breaking current [4.107.1]. 15
5.20 Rated cable-charging breaking current [4.107.2] . 15
5.21 Rated single capacitor bank breaking current [4.107.3] . 15
5.22 Rated back-to-back capacitor bank breaking current [4.107.4]. 16
5.23 Rated capacitor bank inrush making current [4.107.5]. 16
5.24 Rated time quantities [4.109]. 17
5.25 Co-ordination of rated values . 18
6 Design and construction [5]. 18
6.1 Requirements for liquids in circuit-breakers [5.1] . 18
6.2 Requirements for gases in circuit-breakers [5.2]. 18
6.3 Earthing of circuit-breakers [5.3]. 19
6.4 Auxiliary equipment [5.4]. 19
6.5 Dependent power closing [5.5]. 19
6.6 Stored energy closing [5.6] . 19
6.7 Operation of releases [5.8]. 19
6.8 Low and high pressure interlocking devices [5.9]. 20
6.9 Nameplates [5.10]. 20
6.10 Requirements for simultaneity of poles [5.101] . 20
6.11 General requirement for operation [5.102]. 20
6.12 Pressure limits of compressed gas for interruption in gas blast circuit-breakers [5.103] . 21
6.13 Vent outlet [5.104]. 21
6.14 Safety overpressure device [5.105]. 21

7 Type tests [6] .21
7.1 General .21
7.2 Dielectric tests [6.2] .22
7.3 Radio interference voltage (r.i.v.) tests [6.3] .23
7.4 Temperature-rise tests [6.5].23
7.5 Measurement of the resistance of the main circuit [6.4.1] .24
7.6 Short-time withstand current and peak withstand current tests [6.6] .24
7.7 Mechanical and environmental tests [6.101].25
7.8 Miscellaneous provisions for making and breaking tests [6.102].33
7.9 Test circuit for short circuit making and breaking tests [6.103].38
7.10 Short-circuit test quantities [6.104].39
7.11 Short-circuit test procedure [6.105] .43
7.12 Basic short-circuit test-duties [6.106].44
7.13 Critical current tests [6.107] .46
7.14 Out-of-phase making and breaking tests [6.110] .46
7.15 Capacitive current switching tests [6.111] .46
8 Routine tests [7].49
8.1 General .49
8.2 Power frequency voltage withstand dry on the main circuit [7.1] .49
8.3 Voltage withstand tests on control and auxiliary circuits [7.2].49
8.4 Measurement of the resistance of the main circuit [7.3] .49
8.5 Mechanical operating tests [7.101].50
8.6 Design and visual check [7.102] .51
9 Guide to the selection of circuit-breakers for service [8] .51
10 Information to be given with enquiries, tenders and orders [9] .51
Bibliography.53

Tables
Table 1 - Nominal voltages (U ), rated impulse voltages (U ) and short-duration power-frequency
n Ni
(A.C.) test levels U for circuits connected to the contact line . 9
a
Table 2 -- Standard values of rated transient recovery voltage - Representation by two parameters -
Single pole circuit-breaker .13
Table 3 - Standard values of rated transient recovery voltage - Representation by two parameters -
Single pole circuit-breakers.14
Table 4 - Standard values of prospective transient recovery voltage for 180 ° out-of-phase breaking -
Representation by two parameters - Single pole circuit-breaker .15
Table 5 - Suggested values of maximum permissible switching overvoltage to earth.16
Table 6 - Co-ordination Table of rated values for circuit-breakers .18
Table 7 - Mechanical operation test at ambient temperature.28
Table 8 - Standard values of prospective transient recovery voltage for test-duty T60 -
Representation by two parameters - Single pole circuit-breaker .41
Table 9 - Standard values of prospective transient recovery voltage for test-duty T30 -
Representation by two parameters - Single pole circuit-breaker .42
Table 10.49

- 5 - EN 50152-1:2007
Introduction
The European Standard series EN 50152 is divided as follows.
Part 1: Single-phase circuit-breakers with U above 1 kV.
n
Part 2: Single-phase disconnectors, earthing switches and switches with U above 1 kV.
n
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 voltage transformers
EN 50152-1 has to be used in conjunction with EN 62271-100.
The essential requirements of EN 62271-100 have been transcribed in this European Standard. Other
complementary clauses of EN 62271-100 are mentioned in this European Standard. Where a particular
clause of EN 62271-100 is not mentioned, but is not referred as "not applicable" in this Standard, that clause
applies as far as reasonable. Where this Standard states "addition" or "replacement", the relevant text of
EN 62271-100 is to be adapted accordingly.
The numbering of clauses in EN 60694 and the EN 62271 series is not used in this European Standard. The
numbering in square brackets refers to the numbering of clauses in EN 60694 and EN 62271.
NOTE 1 Where terms defined in EN 62271-100 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
used in EN 62271-100 are to be used.
NOTE 2 The suffix N which appears in this Standard for rated values is not present in EN 62271-100.

1 Scope
This EN 50152-1 is applicable to single-phase a.c. one-pole circuit-breakers designed for indoor or outdoor
fixed installations for operation at frequencies of 16,7 Hz and 50 Hz on traction systems having an U
Nm
above 1 kV up to 52 kV.
This EN 50152-1 is also applicable to two-pole circuit-breakers when connected in the following manner: one
pole supplying the connection to the contact line of the track, the second pole supplying the connection to
the feeder cable which runs alongside the same track and which is used to boost the track voltage at regular
intervals in combination with autotransformers. The centre of this circuit is connected to earth.
This European Standard is also applicable to the operating devices of circuit-breakers and to their auxiliary
equipment.
This European Standard does not address circuit-breakers with dependent manual operating mechanism.
NOTE A rated short-circuit making current cannot be specified for these circuit-breakers and the use of these
mechanisms may give reasons for the objection based on their safety in operation.
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.
EN 50124-1:2001 + amendment A2:2005, Railway applications - Insulation coordination - Part 1: Basic
requirements - Clearances and creepage distances for all electrical and electronic equipment.
EN 50163:2004, Railway applications - Supply voltages of traction systems.
EN 60044-1:1999, Instrument transformers – Part 1: Current transformers (IEC 60044-1:1996, modified).
EN 60507:1993, Artificial pollution tests on high-voltage insulators to be used on a.c. systems
(IEC 60507:1991).
EN 60694:1996, Common specifications for high-voltage switchgear and controlgear standards
(IEC 60694:1996).
EN 60721 (all parts), Classification of environmental conditions (IEC 60721 all parts).
EN 62271-100:2001, High-voltage switchgear and controlgear – Part 100: High-voltage alternating-current
circuit-breakers (IEC 62271-100:2001).
EN 62271-102:2002, High-voltage switchgear and controlgear – Part 102: Alternating-current disconnectors
and earthing switches (IEC 62271-102:2001).
3 Definitions
For the purpose of this document, the terms and definitions given in EN 60694 and EN 62271-100 and the
following apply:
3.1
single-pole circuit-breaker
a circuit-breaker with one electrically separated conducting path for the main circuit suitable for use in a
single phase circuit
NOTE The construction arrangement of this device is in principle identical to one phase of a three-phase
circuit-breaker.
- 7 - EN 50152-1:2007
3.2
two-pole circuit-breaker
a circuit-breaker with two independent electrically separated conducting paths for the main circuit
NOTE 1 The two paths may be connected in series for use in a single phase circuit where the establishment and the
seperation of the two paths is simultaneous.
NOTE 2 The construction arrangement of this device is in principle identical to two phases of a three phase
circuit-breaker.
3.3
index of definitions
same as in 3.8 of EN 62271-100, but amended according to the definitions above
4 Service conditions
Clause 2 of EN 60694:1996 is applicable except as follows:
Addition:
The equipment covered by this Standard shall be suitable for installation in trackside locations subject to
vibrations from passing trains, airborne iron dust contamination from train brakes and shall meet the
electromagnetic compatibility (EMC) requirements.
For special service conditions, agreement is necessary between purchaser and supplier.
5 Rating
5.1 General
A circuit-breaker in correct condition of maintenance and adjustment shall be able to withstand all stresses
that occur in service provided that these do not exceed its rated characteristics.
The characteristics of a circuit-breaker, including its operating devices and auxiliary equipment, that shall be
used to determine the rating are the following:
Rated characteristics to be given for all circuit-breakers:
a) rated voltage;
b) rated insulation level;
c) rated frequency;
d) rated normal current;
e) rated short-time withstand current;
f) rated peak withstand current;
g) rated duration of short circuit, for circuit-breakers not fitted with direct over-current release;
h) rated supply voltage of closing and opening devices and of auxiliary circuits;
i) rated supply frequency of closing and opening devices and of auxiliary circuits;
j) rated pressures of compressed gas supply for operation and for interruption, if applicable;

k) rated gas pressure for sealed gas pressure devices;
l) rated short-circuit breaking current;
m) rated transient recovery voltage for terminal faults;
n) rated short-circuit making current;
o) rated operating sequence.
5.2 Rated voltage (U)
Ne
The rated voltage U shall be chosen taking into consideration the maximum voltage level suitable to be
Ne
permanently applied to the circuit-breaker (i.e. highest permanent voltage U as defined in EN 50163).
max1
NOTE This standard makes reference to the values U and U , taken from EN 50163. These values are used
max1 max2
to express the values of U , which are expected to be equal or higher than U . The insulation characteristics are also
Ne max1
expected to be suitable to allow, when required in Clause 5 and Clause 7, the highest non-permanent voltage U .
max2
5.3 Nominal voltage (U)
n
The nominal voltage U shall be one of the voltages listed in Table 1 of EN 50163.
n
5.4 Rated insulation voltage (U) [4.2]
Nm
The value of the rated insulation voltage U , of the rated impulse withstand voltage U and of the
Nm Ni
power-frequency withstand voltage U shall be as given in Table 1, taken from the values listed in
a
EN 50124-1.
- 9 - EN 50152-1:2007
Table 1 - Nominal voltages (U ), rated impulse voltages (U ) and short-duration power-frequency
n Ni
(A.C.) test levels U for circuits connected to the contact line
a
a
OV
U U U U
U Ni
n Nm a
(1,2/50 µs)
kV kV kV kV kV
EN 50163 EN 50124 (EN 60694) EN 50124-1
(24,0) 3 95 b
38 or 50
4 125 50
15 17,25
(36,0) 3 145 70
4 170 b
70 or 95
N/A 3 170 b
70 or 95
4 c 95
c
27,5
(52,0) 3 c 95
4 250 95
see Note 3 52,0 (72,5) 3 250 95
4 300 140
NOTE 1 The choice of the different values of U given for the same U , depends upon the highest non-permanent voltages (such
Ni n
as U of EN 50163) actually appearing in the system.
max2
NOTE 2 OV3 and OV4 are overvoltage categories depending on the system configuration and degree of overvoltage control
(inherent control or protective control) as given in EN 50124-1.
NOTE 3 Take care that in those cases in which for circuit reasons it may happen that a higher voltage is applied to the device
terminals in transient conditions a higher rated insulation voltage between contacts might be necessary (e. g. U = 52 kV for
Nm
U = 25 kV).
n
a
The values in brackets give the rated voltages according to Table 1a of EN 60694 having the nearest equivalence in test
withstand voltages with the test values for single-phase voltages given in this Table.
b
At purchaser’s choice or by agreement.
c
These values are used in railway application only and are not of wide industrial use.

5.5 Rated frequency [4.3]
Subclause 4.3 of EN 60694 is applicable.
5.6 Rated normal current and temperature rise [4.4]
Subclauses 4.4.1 and 4.4.2 of EN 60694 are applicable with the following additions:
The values of rated currents shall be selected from the following standard values:
400 A; 630 A; 800 A; 1 250 A; 1 600 A; 2 000 A; 2 500 A; 4 000 A.
NOTE The above values are selected from the R 10 series, and, if required, higher values than those shown should
also be selected from this series.
If the circuit-breaker is fitted with a series connected accessory, such as a direct over-current release, the
rated normal current of the accessory is the r.m.s. value of the current which the accessory shall be able to
carry continuously without deterioration at its rated frequency, with a temperature rise not exceeding the
values specified in Table 3 of EN 60694.
Current transformers shall comply with EN 60044-1.

5.7 Rated short-time withstand current [4.5]
Subclause 4.5 of EN 60694 is applicable with the following addition:
The rated short-time withstand current is equal to the rated short-circuit breaking current (see 5.13).
5.8 Rated peak withstand current [4.6]
Subclause 4.6 of EN 60694 is applicable with the following addition:
The rated peak withstand current is equal to the rated short-circuit making current (see 5.16).
5.9 Rated duration of short-circuit [4.7]
Subclause 4.7 of EN 60694 is applicable with the following addition:
A rated duration of a short-circuit need not be assigned to a circuit-breaker fitted with a direct over-current
release provided that, when connected in a circuit the prospective breaking current of which is equal to its
rated short-circuit breaking current, the circuit-breaker shall be capable of carrying the resulting current for
the break-time required by the circuit-breaker with the over-current release set for the maximum setting and
maximum time delay if adjustable, when operating in accordance with its rated operating sequence (see
7.6.1).
5.10 Rated supply voltage of closing and opening devices and auxiliary circuit [4.8]
Subclause 4.8 of EN 60694 is applicable with the following addition:
The specified upper limit of the supply voltage for a closing solenoid shall be 105 % of the rated supply
voltage.
5.11 Rated supply frequency of closing and opening devices and auxiliary circuits [4.9]
Subclause 4.9 of EN 60694 is applicable.
5.12 Rated pressures of compressed gas supply for operation and for interruption [4.10]
The value of the pressures to which the circuit-breaker is filled.
Subclause 4.10 of EN 60694 is applicable to the pressure of the compressed gas supply for operation.
No standard values are given for rated pressure of compressed gas supply for interruption.
5.13 Rated short-circuit breaking current (I) [4.101]
Nss
5.13.1 General [4.101]
The rated short-circuit breaking current (I ) is the highest short-circuit current which the circuit-breaker shall
Nss
be capable of breaking under the conditions of use and behaviour prescribed in this standard in a circuit
having a power-frequency recovery voltage corresponding to the rated voltage of the circuit-breaker and
having a transient recovery voltage equal to the rated value specified in 5.14.1.
Short-line fault interruption is not a requirement for circuit-breakers to this standard. Such a requirement shall
be deemed to be special and subject to agreement between purchaser and supplier.
The rated short-circuit breaking current is characterized by two values:
 the r.m.s. value of its a.c. component, termed "rated short-circuit current" for shortness, and
 the percentage d.c. component.

- 11 - EN 50152-1:2007
NOTE 1 If the d.c. component does not exceed 20 %, the rated short-circuit breaking current is characterized only by
the r.m.s. value of its a.c. component.
For determination of the a.c. and d.c. components, see Figure 8 of EN 62271-100.
The circuit-breaker shall be capable of breaking any short-circuit current up to its rated short-circuit breaking
current containing any a.c. component up to the rated value and associated with it any percentage d.c.
component up to that specified, under the conditions mentioned above.
The following applies to a standard circuit-breaker:
a) At voltages below the rated voltage, it will be capable of breaking its rated short-circuit breaking current.
NOTE 2 For circuit-breakers having proved rated short-circuit breaking currents I at two different rated voltages
Nss
U , intermediate characteristics may be assigned from the straight line drawn between the two proved rating points on a
Ne
plot of log U versus log I. In case of doubt, tests should be carried out to check the validity of the interpolation.
b) At voltages above the rated voltage, no short-circuit breaking current is guaranteed except to the extent
provided for in 5.18.
5.13.2 A.C. component of the rated short-circuit breaking current [4.101.1]
The r.m.s. value of the a.c. component of the rated short-circuit breaking current shall be selected from the
values shown in Table 6.
NOTE The values in Table 6 are selected from the R 10 series, and, if required, higher values than those shown
should also be selected from this series.
5.13.3 D.C. component of the rated short-circuit breaking current [4.101.2]
The value of the percentage d.c. component shall be determined as follows:
a) For a circuit-breaker which can be tripped by a short-circuit current without the aid of any form of
auxiliary power, the percentage d.c. component shall correspond to a time interval τ equal to the
minimum opening time of the circuit-breaker.
b) For a circuit-breaker which can be tripped solely by a form of auxiliary power, the percentage d.c.
component shall correspond to a time interval τ equal to the minimum opening time of the circuit-breaker
plus one-half cycle of rated frequency.
The minimum opening time mentioned above is the shortest opening time of the circuit-breaker obtainable
under any service conditions whether in a breaking operation or a make-break operating cycle.
The percentage value of the d.c. component is dependent on the time interval τ. Standard values and special
case values are given in Figure 9 of EN 62271-100.
5.14 Rated transient recovery voltage for terminal faults [4.102]
5.14.1 General
The rated transient recovery voltage (TRV) for terminal faults, relating to the rated short-circuit breaking
current in accordance with 5.13.1, is the reference voltage which constitutes the limit of the prospective
transient recovery voltage of circuits which the circuit-breaker shall be capable of breaking in the event of a
short-circuit at its terminals.
5.14.2 Representation of transient recovery voltage waves [4.102.1]
The wave form of transient recovery voltages varies according to the arrangement of actual circuits.

NOTE 1 The transient recovery voltage approximates to a damped single frequency oscillation. This wave form is
adequately represented by an envelope consisting of two line segments defined by means of two parameters. Methods
of drawing TRV envelopes are given in EN 62271-100, Annex F.
The influence of local capacitance on the source side of the circuit-breaker produces a slower rate of rise of
the voltage during the first few microseconds of the TRV. This is taken into account by introducing a time
delay.
It appears that every part of the TRV wave may influence the interrupting capability of a circuit-breaker. The
very beginning of the TRV may be of importance for some types of circuit-breakers.
NOTE 2 This part of TRV, called initial TRV (ITRV), is caused by the initial oscillations of small amplitude due to
reflections from the first major discontinuity along the busbar. The ITRV is a physical phenomenon which is very similar
to the short-line fault. Compared with the short-line fault, the first voltage peak is rather low, but the time to the first peak
is extremely short, that is within the first microseconds after current zero. Therefore the thermal mode of interruption may
be influenced.
NOTE 3 Since the ITRV is proportional to the busbar surge impedance and to current, the ITRV requirement can be
neglected for metal-enclosed switchgear and in most railway applications, because of the low surge impedance and for
all switchgear with a rated short-circuit breaking current of less than 50 kA.
NOTE 4 If the circuit-breaker has a short-line fault rating the ITRV requirements are considered to be covered if the
short-line fault tests are carried out using a line without time delay (see 7.10.5.2).
5.14.3 Representation of rated TRV [4.102.2]
The following parameters are used for the representation of rated TRV:
a) four-parameter reference line not applicable;
b) two-parameter reference line (see Figure 11 of EN 62271-100):
u =  reference voltage (TRV peak value), in kilovolts,
c
=  time to reach u , in microseconds;
t
3 c
c) delay line of TRV (see Figure 11 of EN 62271-100):
t =  time delay, in microseconds,
d
u' =  reference voltage, in kilovolts,
t' =  time to reach u', in microseconds.
The delay line starts on the time axis at the rated time delay and runs parallel to the first section of the
reference line of rated TRV and terminates at the voltage u' (time-coordinate t').
d) not applicable.
5.14.4 Standard values of rated TRV [4.102.3]
Standard values of rated TRV for single-phase circuit-breakers are given in Table 2.
Where the purchaser has requirements for higher severities of TRV than those in Table 2, these shall be
identified in purchaser's specification.

- 13 - EN 50152-1:2007
Table 2 – Standard values of rated transient recovery voltage - Representation by two parameters -
Single pole circuit-breaker
U U U t t u’ t’ U /t
n max2 c 3 d c 3
TRV   rate of rise
peak value
kV kV kV µs µs kV µs kV/µs
15 18 36 108 16 12 52 0,33
25 29 57 132 20 19 64 0,43
with:
U = 1,4 × 2 × U ;
c max 2
1,4 = amplitude factor (see EN 62271-100);
U
c
′
u ≈ ;
t
t′ = + t ;
d
t = 0,15 × t .
d 3
NOTE 1 The values in Table 2 are minimum values. The values of Table 1a of EN 62271-100 may be adopted with
and t unchanged.
U()EN 62271 − 100 = 3 × U
max 2
NOTE 2 The TRV figures are for a single-pole circuit-breaker. The equivalent three-phase circuit-breaker is tested
with u and U /t values equal to 1,5 times those shown in Table 2. Values for the time delay t are to be in accordance
c c 3 d
with Table 1a of EN 62271-100.
5.15 Standard values of initial transient recovery voltage [4.102.4]
Subclause 4.102.4 of EN 62271-100 is not applicable to single-phase circuit-breakers for railway
applications.
5.16 Rated short-circuit making current [4.103]
The rated short-circuit making current (see Figure 8 of EN 62271-100) 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 5.13).
5.17 Rated operating sequence [4.104]
There are two alternative rated operating sequences as follows:
a) O - t - CO - t' - CO
Unless otherwise specified:
t = 180 s for circuit-breakers not intended for rapid auto-reclosing;
t = 0,3 s for circuit-breakers intended for rapid auto-reclosing (dead time);
t' = 180 s.
NOTE 1 Instead of t' = 180 s, other values: t' = 15 s (for rated voltages less than or equal to 52 kV) and t' = 60 s are
also used for circuit-breakers intended for rapid auto-reclosing.

b) CO - t" - CO
with:
t" = 15 s, for circuit-breakers non intended for rapid auto-reclosing;
where:
O represents an opening operation;
CO represents a closing operation followed immediately (that is, without any intentional
time-delay) by an opening operation;
t, t' and t" are time-intervals between successive operations.
NOTE 2 t, t' and t" should always be expressed in seconds.
If the dead time is adjustable, the limits of adjustment shall be specified.
5.18 Rated out-of-phase breaking current [4.106]
If required by the purchaser, a single-pole circuit-breaker may be used in service in the open position with
two different phases across its open terminals, such as a circuit-breaker used for supplying an alternative
feed in emergency conditions. This test shall be performed at a rating specified by the purchaser based on
the maximum fault current which can exist for this condition. This out-of-phase breaking current cannot
exceed 50 % of the rated short-circuit current with two phases displaced by a maximum of 120 ° or 180 °.
The purchaser shall identify if out-of-phase breaking current is applicable and which condition applies.
NOTE The 120° case occurs when voltage is derived from two different phases of a three-phase system. The 180 °
case typically occurs when the neutral is the central point of a single-phase system (currently indicated as ± U system).
n
The transient recovery voltage shall be as given in Tables 3 and 4.
Table 3 - Standard values of prospective transient recovery voltage for 120 ° out-of-phase breaking -
Representation by two parameters - Single pole circuit-breaker
Nominal voltage TRV Time Rate of rise
peak value
a
U U U t U /t
n max2 c 3 c 3
kV kV kV µs kV/ µs
15 18 55 216 0,25
25 29 88 264 0,33
a
EN 50163
with:
;
U = 1,25 × 2 × 3 × U
c max 2
1,25 = corrected amplitude factor (see EN 62271-100);
factor of maximum phase-displacement;
3 =
t = 2 × t (of Table 2).
3 3
- 15 - EN 50152-1:2007
Table 4 - Standard values of prospective transient recovery voltage for 180 ° out-of-phase breaking -
Representation by two parameters - Single pole circuit-breaker
Nominal voltage TRV Time Rate of rise
peak value
U U U t U /t
n max2 c 3 c 3
kV kV kV µs kV/µs
15 18 64 216 0,30
25 29 102 264 0,39
with:
;
U = 1,25 × 2 × 2 × U
c max 2
1,25 = corrected amplitude factor (see EN 62271-100);
2 = factor of phase opposition;
t = 2 × t (of Table 2).
3 3
Where the purchaser has requirements for higher severities of TRV than those given in Tables 3 and 4,
these shall be identified in purchaser's specification.
5.19 Rated line-charging breaking current [4.107.1]
When specified by the purchaser the circuit-breaker shall be capable of breaking the capacitive current of the
feeder cable or the catenary at a voltage value of not less than U (see EN 50163), and with a current not
max1
exceeding 10 A.
5.20 Rated cable-charging breaking current [4.107.2]
The rated cable-charging breaking current is the maximum cable-charging current that the circuit-breaker
shall be capable of breaking at its rated voltage under the conditions of use and behaviour prescribed in this
Standard and without exceeding the appropriate maximum permissible switching overvoltages specified by
the manufacturer. Suggested values are given in Table 5.
The specification of rated cable-charging breaking current to a circuit-breaker is not mandatory but is made
on request, and is considered unnecessary for circuit-breakers of rated voltages equal to or less than 24 kV.
If assigned, it is recommended that the rated cable-charging breaking current be 50 A for 15 kV systems and
80 A for 25 kV systems
5.21 Rated single capacitor bank breaking current [4.107.3]
The rated single capacitor bank breaking current is the maximum capacitor current that the circuit-breaker
shall be capable of breaking at its rated voltage under the conditions of use and behaviour prescribed in this
standard and without exceeding the maximum permissible switching overvoltages specified by the
manufacturer. Suggested values are given in Table 5, columns B.
NOTE 1 This breaking current refers to the switching of a shunt capacitor bank where no shunt capacitors are
connected to the source side of the circuit-breaker.
The specification of a rated single capacitor bank breaking current is not mandatory.
NOTE 2 Values of rated single capacitor bank breaking current should be selected from the R 10 series and with a
current not exceeding 200 A unless otherwise agreed between purchaser and supplier.

5.22 Rated back-to-back capacitor bank breaking current [4.107.4]
The rated back-to-back capacitor bank breaking current is the maximum capacitor current that the
circuit-breaker shall be capable of breaking at its rated voltage under the conditions of use and behaviour
prescribed in this standard and without exceeding the maximum permissible switching overvoltages specified
by the manufacturer. Suggested values are given in Table 5, columns B.
The specification of a rated back-to-back capacitor bank breaking current is not mandatory.
NOTE 1 This breaking current refers to the switching of a shunt capacitor bank where one or several shunt capacitor
banks are connected to the source side of the circuit-breaker giving an inrush making current equal to the rated capacitor
bank inrush making current.
NOTE 2 Values of rated back-to-back capacitor bank breaking currents should be selected from the R 10 series and
with a current not exceeding 200 A unless otherwise agreed between purchaser and supplier.
NOTE 3 Similar conditions could apply for switching of cables.
5.23 Rated capacitor bank inrush making current [4.107.5]
The rated capacitor bank inrush making current is the peak value of the current that the circuit-breaker shall
be capable of making at its rated voltage and with a frequency of the inrush current appropriate to the
service conditions.
The specification of a rated capacitor bank inrush making current is mandatory for circuit-breakers that have
a rated back-to-back capacitor bank breaking current.
Table 5 - Suggested values of maximum permissible switching overvoltage to earth
U U U U U
n Nm max2 Ni max.earth
A B
a b a b
kV kV kV kV
kV p.u. kV p.u.
15 24 18 170 97 3,8 64 2,5
25 36 29 250 144
...