CLC/TS 50562:2011

SLOVENSKI STANDARD
01-oktober-2011
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Railway applications - Fixed installations - Process, measures and demonstration of
safety for electric traction systems
Bahnanwendungen - Ortsfeste Anlagen - Prozess, Maßnahmen und Nachweisführung
für die Sicherheit in der Bahnstromversorgung
Applications ferroviaires - Installations fixes - Processus, mesures et démonstration de la
sécurité pour les installations fixes de traction électrique
Ta slovenski standard je istoveten z: CLC/TS 50562:2011
ICS:
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CLC/TS 50562
SPÉCIFICATION TECHNIQUE
August 2011
TECHNISCHE SPEZIFIKATION
ICS 29.280
English version
Railway applications -
Fixed installations -
Process, measures and demonstration of safety for electric traction
systems
Applications ferroviaires -  Bahnanwendungen -
Installations fixes - Ortsfeste Anlagen -
Processus, mesures et démonstration de Prozess, Maßnahmen und
la sécurité pour les installations fixes de Nachweisführung für die Sicherheit in der
traction électrique Bahnstromversorgung

This Technical Specification was approved by CENELEC on 2011-05-24.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to
make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting
national standards in force.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TS 50562:2011 E
Contents
Foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 7
4 Safety process . 9
4.1 General. 9
4.2 System definition . 11
4.3 Hazard identification . 11
4.4 Risk assessment . 12
4.5 Measures . 12
4.6 Evaluation . 12
4.7 Demonstration of safety . 12
5 Generic risk assessment . 13
6 System definition . 13
6.1 Electric traction system . 14
6.2 Substations and switching stations . 14
6.3 Contact line system . 16
6.4 Return circuit . 16
6.5 Interfaces of the electric traction system . 17
6.6 Interfaces to substations and switching stations . 17
6.7 Interfaces to contact line system . 18
6.8 Interfaces to return circuit. 19
7 Hazard identification . 20
8 Measures . 20
8.1 General. 20
8.2 Substations and switching stations . 21
8.3 Contact line system . 22
8.4 Return circuit . 22
9 Safety evaluation for the reference system . 22
Annex A (informative) Hazard log resulting from the generic risk assessment . 24
A.1 General. 24
A.2 Risk assessment process . 24
A.3 Hazard Log . 26
Annex B (informative) Abbreviations and acronyms . 42
Annex C (informative) Documents and standards correlated to this document . 43
Bibliography . 47

– 3 – CLC/TS 50562:2011
Figures
Figure 1 – Safety process for conventional electric traction system . 10
Figure 2 – Electric traction system and its interfaces . 14

Tables
Table 1 – List of foreseeable top-level hazards and accidents . 11
Table A.1 – List of foreseeable top-level hazards and accidents . 25
Table A.2 – Fields of hazard log . 26
Table A.3 – Substations and switching stations . 27
Table A.4 – Control and protection, hardware components . 28
Table A.5 – Control and protection, software. 31
Table A.6 – Contact system . 33
Table A.7 – Return circuit. 36
Table A.8 – Standards referenced in hazard log . 37
Table B.1 – Abbreviations and acronyms . 42
Table C.1 – List of correlated documents and standards . 43

Foreword
This Technical Specification 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, Electrical and electronic applications for railways.
It was circulated for vote in accordance with the Internal Regulations, Part 2, Subclause 11.3.3.3 and was
approved by CENELEC as CLC/TS 50562 on 2011-05-24.
The following date is proposed:
– latest date by which the existence of the CLC/TS

has to be announced at national level
(doa) 2011-11-24
__________
– 5 – CLC/TS 50562:2011
1 Scope
This Technical Specification defines the process, measures and demonstration of safety for the electric
traction systems of
– railways,
– guided mass transport systems,
– trolleybus systems.
The systems can be elevated, at-grade and underground.
It does not apply to
– underground mine traction systems,
– cranes, transportable platforms and similar transportation equipment on rails, temporary structures
(e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the
contact line system and are not endangered by the traction power supply system,
– suspended cable cars,
– funicular railways,
– magnetic levitated systems,
– railways with inductive power supply without contact system,
– railways with buried contact system that is required to be energised only below the train to ensure
safety,
but it can support the safety considerations of such systems as far as applicable.
This Technical Specification refers to standards and common practice to demonstrate safety including the
functional aspects.
This Technical Specification applies to the erecting of new lines and to all significant changes of existing
lines.
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 50110 (all parts), Operation of electrical installations
EN 50119:2009, Railway applications – Fixed installations – Electric traction overhead contact lines
EN 50122 (all parts), Railway applications – Fixed installations – Electrical safety, earthing and the return
circuit
EN 50122-1:2011, Railway applications – Fixed installations – Electrical safety, earthing and the return
circuit – Part 1: Protective provisions against electric shock
EN 50123 (all parts), Railway applications – Fixed installations – D.C. switchgear
EN 50124 (all parts), Railway applications – Insulation coordination

CLC/TR / EN 50126 (all parts), Railway applications – The specification and demonstration of Reliability,
Availability, Maintainability and Safety (RAMS)
CLC/TR 50126-2:2007, Railway applications – The specification and demonstration of Reliability,
Availability, Maintainability and Safety (RAMS) – Part 2: Guide to the application of EN 50126-1 for safety
EN 50152 (all parts), Railway applications – Fixed installations – Particular requirements for a.c.
switchgear
EN 50153, Railway applications – Rolling stock – Protective provisions relating to electrical hazards
EN 50163, Railway applications – Supply voltages of traction systems
EN 50367, Railway applications – Current collection systems – Technical criteria for the interaction
between pantograph and overhead line (to achieve free access)
EN 50388, Railway applications – Power supply and rolling stock – Technical criteria for the coordination
between power supply (substation) and rolling stock to achieve interoperability
CLC/TR 50488, Railway applications – Safety measures for personnel working on or near overhead
contact lines
EN 60255 (all parts), Measuring relays and protection equipment (IEC 60255, all parts)
EN 60664 (all parts), Insulation coordination for equipment within low-voltage systems
(IEC 60664, all parts)
EN 62271-1:2008, High- voltage switchgear and controlgear – Part 1: Common specifications
(IEC 62271-1:2007)
EN 62305 (all parts), Protection against lightning (IEC 62305, all parts)

– 7 – CLC/TS 50562:2011
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
contact line system
support network for supplying electrical energy from substations to electrically powered traction units,
which covers overhead contact line systems and conductor rail systems; the electrical limits of the system
are the feeding point and the contact point to the current colle
...