EN 50124-2:2017

SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST EN 50124-2:2002
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Railway applications - Insulation coordination - Part 2: Overvoltages and related
protection
Bahnanwendungen - Isolationskoordination - Teil 2: Überspannungen und geeignete
Schutzmaßnahmen
Applications ferroviaires - Coordination de l'isolement - Partie 2: Surtensions et
protections associées
Ta slovenski standard je istoveten z: EN 50124-2:2017
ICS:
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50124-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2017
ICS 29.080.01; 29.280 Supersedes EN 50124-2:2001
English Version
Railway applications - Insulation coordination - Part 2:
Overvoltages and related protection
Applications ferroviaires - Coordination de l'isolement - Bahnanwendungen - Isolationskoordination - Teil 2:
Partie 2: Surtensions et protections associées Überspannungen und zugeordnete Schutzmaßnahmen
This European Standard was approved by CENELEC on 2017-02-06. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50124-2:2017 E
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and Definitions . 5
4 Contact line network . 6
4.1 Equipment not protected by a metal-oxide arrester . 6
4.2 Equipment protected by a metal-oxide arrester . 6
4.2.1 General . 6
4.2.2 Simulation for long pulse . 6
4.2.3 Simulation for short pulse . 9
5 Train line network . 9
5.1 Equipment not protected by a metal-oxide arrester . 9
5.2 Equipment protected by a metal-oxide arrester . 10
6 Tests . 10
Annex A (informative) Maximum value of voltage U according to duration . 11
Annex ZZ (informative) Relationship between this European Standard and the
Essential Requirements of EU Directive 2008/57/EC . 13
Tables
Table 1 — Values of the reference voltage U . 7
p
Table A.1 — Overvoltages . 12
Table ZZ.1 — Correspondence between this European Standard, the TSI
“Locomotives and Passenger Rolling Stock” (REGULATION (EU) No 1302/2014 of
18 November 2014) and Directive 2008/57/EC . 13
Table ZZ.2 — Correspondence between this European Standard, the TSI “Energy”
(REGULATION (EU) No 1301/2014 of 18 November 2014 . 13
) and Directive 2008/57/EC
European foreword
This document (EN 50124-2:2017) has been prepared by CLC/TC 9X, “Electrical and electronic
applications for railways.”
The following dates are fixed:
• latest date by which this document has to be (dop) 2018–02–06
implemented at national level by publication
of an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2020–02–06
conflicting with this document have to

be withdrawn
This document supersedes EN 50124-2:2001.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Introduction
This European Standard is part of the EN 50124 series, Railway applications – Insulation coordination.
EN 50124 consists of two parts:
— EN 50124-1, Railway applications - Insulation coordination - Part 1: Basic requirements -
Clearances and creepage distances for all electrical and electronic equipment;
— EN 50124-2, Railway applications - Insulation coordination - Part 2: Overvoltages and related
protection.
This Part 2 deals with the shortest durations of overvoltages referred to as Zone A and Zone B in
Figure A.1 in Annex A.
1 Scope
This European Standard applies to:
— fixed installations (downstream of the secondary of the substation transformer) and rolling stock
equipment linked to the contact line of one of the systems defined in EN 50163;
— rolling stock equipment linked to a train line.
This European Standard gives simulation and/or test requirements for protection against transient
overvoltages of such equipment.
Long-term overvoltages are not addressed in this document.
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.
EN 50163:2004, Railway applications - Supply voltages of traction systems
EN 50533, Railway applications - Three-phase train line voltage characteristics
EN 60099-4, Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems (IEC
60099-4)
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply:
NOTE The definitions are in accordance with those of EN 50163 (see also Annex A). Long-term, medium-
term and short-term overvoltages are equivalent to respectively temporary, switching and lightning overvoltages
defined in EN 60664–1.
3.1 Voltages
3.1.1
overvoltage
voltage having a peak value exceeding the corresponding peak value of maximum steady-state
voltage at normal operating conditions
[SOURCE: EN 60664-1]
3.1.2
long-term overvoltage
overvoltage at relatively long duration due to voltage variations
Note 1 to entry: A long-term overvoltage is independent of the network load. It is characterized by a voltage/time
curve.
3.1.3
transient overvoltage
short duration overvoltage of a few milliseconds or less due to current transfer
Note 1 to entry: A transient overvoltage depends on the network load. It cannot be characterized by a
voltage/time curve. Basically, a transient overvoltage is the result of a current transfer from a source to the load
(network).
3.1.4
medium-term overvoltage
transient overvoltage at any point of the system due to specific switching operation or fault
3.1.5
short-term overvoltage
transient overvoltage at any point of the system due to a specific lightning discharge
3.2
network
set of conductors fulfilling a certain function, the overvoltages of which are likely to damage the
equipment they are connected to
4 Contact line network
NOTE The provisions of this Clause 4 do not take into account rapid transient overvoltages in the
multimegahertz range such as generated by operation of vacuum circuit breakers which may require a specific
overvoltage protection.
4.1 Equipment not protected by a metal-oxide arrester
If the equipment is not protected by a metal-oxide arrester, the protection against overvoltages shall
take into account overvoltages limited only by the intrinsic insulation of the contact line and the
possible presence of other types of arrester or spark gaps.
4.2 Equipment protected by a metal-oxide arrester
4.2.1 General
If the supplier wants to benefit from the presence of a metal-oxide arrester for reducing constraints
resulting from 4.1, the supplier shall perform a simulation of the behaviour of the equipment with its
protection against overvoltages according to 4.2.2 and 4.2.3.
Long pulse overvoltages set out in 4.2.2 refers to Zone B in Figure A.1 for switching overvoltages and
short pulse overvoltages set out in 4.2.3 refers to Zone A in Figure A.1 for lightning overvoltages.
The circuits of the protected equipment likely to modify the electrical behaviour of the protection shall
also be simulated.
The equipment connected to the contact line shall be able to withstand the overvoltages without
damage, with the exception of the protective fuse, if any.
4.2.2 Simulation for long pulse
4.2.2.1 Simulation of switching overvoltage scenarios
When specified by the purchaser, the supplier shall perform a simulation of the behaviour of its
equipment when there is a transient overvoltage due to current transfer between the contact line and
the on-board electrical equipment. The purchaser shall provide the necessary information.
EXAMPLE 1 The overvoltage is generated on the contact line in case of emergency disconnection of all
traction converters of a train when they were running at full power.
EXAMPLE 2 The overvoltage is generated on the contact line when a short circuit, occurring in one of the on-
board equipment input circuit, is cleared by a protection device (e.g. d.c. circuits breaker, fuse).
NOTE The parameters affecting such simulation are for example: line impedance (inductance and resistance
per km), train architecture (e.g. number and type of converters, power diagram), converter power, converter input
circuit characteristics (e.g. inductance, capacitance), characteristics of the protection device clearing the short-
circuit current (e.g. tripping current or pre-arcing current, turned off current, arc voltage). EN 50388:2012,
Clause 11 and Annex D provide limits for short circuit levels and typical values for the line and source
impedances for TSI lines.
When the necessary information cannot be obtained from the purchaser, the supplier shall perform the
simulation for the conventional long pulse as described in 4.2.2.2.
4.2.2.2 Conventional long pulse
The conventional long pulse is a voltage pulse of trapezoid shape. The pulse duration is 2 ms, with a
rise time t of 1,5 ms, a plateau time t of 0,3 ms and a fall time t of 0,2 ms. The peak value of the
2 3 4
resulting overvoltage signal is equal to 70 % of the reference voltage U defined in Table 1. The
p
overvoltage is applied to the equipment at the line contact as a null impedance voltage source and
without considering the presence of its metal-oxide arrester.
Table 1 — Values of the reference voltage U
p
Nominal voltage Reference voltage
according to EN 50163
U
p
U
n
kV
kV
0,75 4
1,5 6
3 12
15 60
25 100
NOTE The values of U take into account the values of U as given in
p res
IEC 60099–1 and EN 60099–4 and/or Upl as given in EN 50526–1. But they relate
to a theoretical arrester, for simulation purposes only, and present not any direct
link to U of IEC 60099–1 and EN 60099–4 and/or U of EN 50526–1.
res pl
Figure 1 shows the conventional long pulse used for d.c. contact lines. The trapezoid shape is
superimposed on the nominal d.c. line voltage and the starting time has no relevance.
Key
t : t.b.d Time to beginning of long pulse
t :
1,5 ms Rise time
t : 0,3 ms Plateau time
t : 0,2 ms Fall time
U :
see Table 1 Nominal voltage
n
U : see Table 1 Reference voltage
p
Figure 1 — Conventional long pulse u
...