EN 50123-6:2003/A1:2014

SLOVENSKI STANDARD
01-april-2015
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Railway applications - Fixed installations - D.C. switchgear -- Part 6: D.C. switchgear
assemblies
Bahnanwendungen - Ortsfeste Anlagen - Gleichstrom-Schalteinrichtungen -- Teil 6:
Gleichstrom-Schaltanlagen
Applications ferroviaires - Installations fixes - Appareillage à courant continu -- Partie 6:
Ensembles d'appareillage
Ta slovenski standard je istoveten z: EN 50123-6:2003/A1:2014
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 50123-6:2003/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2014
ICS 29.130.99; 29.280
English Version
Railway applications - Fixed installations - D.C. switchgear - Part
6: D.C. switchgear assemblies
Applications ferroviaires - Installations fixes - Appareillage à Bahnanwendungen - Ortsfeste Anlagen - Gleichstrom-
courant continu - Partie 6: Ensembles d'appareillage Schalteinrichtungen - Teil 6: Gleichstrom-Schaltanlagen
This amendment A1 modifies the European Standard EN 50123-6:2003; it was approved by CENELEC on 2014-11-17. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 amendment 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, 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
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50123-6:2003/A1:2014 E

Contents Page
Foreword. 3
2 Normative references . 4
3 Definitions . 4
8 Tests. 4
8.2 List of the applicable tests . 4
8.3 Performance of tests . 4
8.3.9 Internal arc test . 4
Annex B (normative) Method for testing under conditions of arcing due to an internal fault . 5
B.1 Purpose of the test . 5
B.2 Characteristics – Rated short-circuit current under internal arcing conditions (I ). 5
Narc
B.3 Test arrangements . 6
B.3.1 Test specimen . 6
B.3.2 Test circuit . 7
B.3.3 Voltage . 7
B.3.4 Duration of the test . 7
B.4 Test procedure . 7
B.4.1 Supply circuit . 7
B.4.2 Arc initiation . 7
B.4.3 Indicators . 8
B.4.4 Repetition of the test . 9
B.5 Assessment of the test . 9
B.6 Test report . 10
Bibliography . 14

- 3 - EN 50123-6:2003/A1:2014
Foreword
This document (EN 50123-6:2003/A1:2014) has been prepared by CLC/SC 9XC "Electric supply and earthing
systems for public transport equipment and ancillary apparatus (Fixed installations)".
The following dates are fixed:

• latest date by which this document has to be (dop) 2015-11-17
implemented at national level by publication of
an identical national standard or by
endorsement
(dow) 2017-11-17
• latest date by which the national standards
conflicting with this document have to
be withdrawn
This amendment was elaborated to provide guidance to the requirement of 6.6.3, Internal arcing, that gas or
vapour escaping under pressure does not endanger operating staff.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

2 Normative references
Add the following reference:
EN 50123-1:2003, Railway applications – Fixed installations – D.C. switchgear – Part 1: General
3 Definitions
Replace Clause 3 by the following:
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50123-1:2003 and the following
apply.
3.1
internal arc
arcing within a switchgear assembly arising from a fault between active parts and/or between active parts and
other conductive parts
3.2
rated short-circuit current under internal arcing conditions (I )
Narc
current, during the test duration/150 ms, indicating the maximum allowable value of sustained short-circuit
current at the terminals of the incoming unit for which the requirements of this test specification are fulfilled
Note 1 to entry: The value is the maximum value of the prospective sustained short-circuit current.
3.3
compartment under test
compartment of a switchgear assembly which is subject to an internal arc test
8 Tests
8.2 List of the applicable tests
Add the following at the end of Table 2:
Internal arc test Type, optional 8.3.9

8.3 Performance of tests
Add the following after 8.3.8:
8.3.9 Internal arc test
The internal arc test is an optional type test. The test shall be performed according to the procedure specified
in Annex B. The criteria for successful passing are given in B.5.

- 5 - EN 50123-6:2003/A1:2014
Add the following after Annex A:
Annex B
(normative)
Method for testing under conditions of arcing due to an internal fault
B.1 Purpose of the test
Annex B applies to metal-enclosed d.c. switchgear assemblies - hereafter called ASSEMBLIES - used in
indoor stationary installations.
The test procedure described below is intended
 to assess the ability of the ASSEMBLY to limit the risk of personal injury,
 to verify the effectiveness of the design in protecting persons,
in case of an internal arc.
The testing conditions take into account that ASSEMBLIES are installed in areas restricted to authorized
personnel.
NOTE This is equivalent to accessibility class A of EN 62271-200:2012.
B.2 Characteristics – Rated short-circuit current under internal arcing
conditions (I )
Narc
Value of the rated short-circuit current current under internal arcing conditions I shall be equal to the rated
Narc
earth fault current I . The peak of the short-circuit current value is conventionally assumed to be 1,42 times
Ncwe
the prospective sustained short-circuit current (fault of negligible impedance).
NOTE The current level during internal arcing depends on the earthing of the switchboard frame (see
EN 50123-7-1:2003, 6.5.7). High fault currents can be expected where the switchboard frame is
– directly connected to the return circuit as shown in EN 50123-7-1:2003, 6.5.7, Figure 4b, or
– connected to substation earth as shown in EN 50123-7-1:2003, 6.5.7, Figure 4a, and a voltage limiting device is
installed between substation earth and the return circuit.
Lower fault currents can be expected where the bedding resistance of the track and the earth resistance limit the fault
current.
B.3 Test arrangements
B.3.1 Test specimen
The test shall be carried out on representative samples. In case of an ASSEMBLY with a continuous main
busbar, consisting of extensible (modular) standalone units, the test specimen shall consist of minimum two
units connected together as in service.
The following points shall be observed.
 The test shall be carried out on a test specimen not previously subjected to an arcing test or on a
specimen cleaned and prepared accordingly. The specimen and the equipment in it may be repaired or
replaced before each test.
NOTE Degradation of insulation due to carbonisation or moderate erosion of metal parts is not necessarily
considered to render a unit unsuitable for a further test.
 The test specimen shall be placed in an open area and shall be fixed by its designed means.
 Vertical indicators shall be installed all around.
 A ceiling shall be located at a distance of (200 ± 50) mm from the upper part of the test specimen unless
differently stated by the manufacturer.
If a test specimen includes a roof according to the following specification and as shown in Figure B.1 it
shall be tested with the roof installed and an additional ceiling is not required. The roof
 covers the top surface completely and
 is of a protection degree of IPX1 or higher and
 is mounted at minimum distance d to the top of the ASSEMBLY of no more than 200 mm.
c
 The test specimen shall be fully equipped. Earthing and bonding shall be as for normal service.
 Mock-ups of internal components are permitted provided that
 they have the same volume and shape as the original items,
 similar external materials, with any metallic external material is earthed in a similar manner to normal
service.
 All doors and covers provided are closed.
 The test specimen shall be earthed at the earthing point provided.
 Secondary devices need not be installed if inside a separate compartment for control circuits. Means for
wiring from the control compartment to the compartment under test shall be installed.

- 7 - EN 50123-6:2003/A1:2014
B.3.2 Test circuit
A typical diagram of the test circuit is shown in EN 50123-1:2003, Figure A.1, with typical calibration and
characteristics shown in EN 50123-1:2003, Figure A.2. The supply source S feeds a circuit comprising
adjustable resistors R, adjustable reactors L and the test object A.
If the supply source is not a generator, then the minimum converter pulse number shall be 6 with a minimum
supply frequency of 50 Hz.
The test circuit shall produce a peak current with the characteristic illustrated as calibration 1 in
EN 50123-1:2003, Figure A.2.
B.3.3 Voltage
The applied voltage of the test circuit shall be equal to the rated voltage U .
Ne
B.3.4 Duration of the test
The test duration shall be 150 ms.
B.4 Test procedure
B.4.1 Supply circuit
The test sample is connected and supplied corresponding to the normal service arrangement. The earthing of
the enclosure is to be connected to the negative conductor of the supply source.
Infeed and earth connection shall be to the same switchgear panel.
Any device (for example, protection relay or direct overcurrent release) that may automatically trip the circuit
before the end of the prospective duration of the test shall be made inoperative or ineffective during the test.
If compartments or functional units are equipped with devices intended to limit the duration of the arc itself by
other means (for example, by transferring the current to a metalli
...