Railway applications-Fixed installations-Electrical safety earthingand thereturncircuit
Part2:Provisions against the effectsofstraycurrents caused byd.c.tractionsystems
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National foreword
BSI 2011
ISBN 978 0 580 74983 4
ICS 29.120.50; 29.280
Amendments issued since publication
Date Text affected
This British Standard is the UK implementation of EN 50122-2:2010.It supersedes BS EN 50122-2:1999 which is withdrawn.
Committee GEL/9/3 Railway Electrotechnical Applications - Fixed The UK participation in its preparation was entrusted to TechnicalEquipment.
A list of organizations represented on this mittee can be obtained on request to its secretary.
This publication does not purport to include allthe necessaryprovisions of a contract. Users are responsible for its correctapplication.
Compliance with a British Standard cannot confer immunity fromlegal obligations.
This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.
28February 2011Correction to font errors in PDF31March 2011CorrectionFebruary's Corrigendum
EN50122-2
ICS 29.120.50; 29.280
Supersedes EN 50122-2:1998 corr. Aug.2001 A1:2002
English version
Railway applications-Fixed installations-Part2:Provisionsagainsttheeffectsofstraycurrentscaused byd.c. Electricalsafety earthing and thereturncircuit-tractionsystems
Applicationsferroviaires-Installations fixes - Securite electrique mise a la terre etcircuit de retour -Partie 2: Mesures de protection contre lestraction électrique a courant continu effets des courants vagabonds issus de la
Bahnanwendungen -Elektrische Sicherheit Erdung und Ortsfeste Anlagen -Ruckleitung-Teil 2:Schutzmaβnahmen gegenZugforderungssysteme Streustromwirkungen durch Gleichstrom-
with the CEN/CENELEC Intemal Regulations which stipulate the conditions for giving this European Standarduoesetje Aue jnom piepuejs euogeu e jo sngis eu
Up-to-date lists and biblographical references conceming such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English French German). A version in any otherto the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical ommittees of Austria Belgium Bulgaria Croatia Cyprus Latvia Lithuania Luxembourg Malta the Netherlands Norway Poland Portugal Romania Slovakia Slovenia Spain Sweden Switzerland and the United Kingdom.
European Committee for Electrotechnical StandardizationEuropaisches Komitee fur Elektrotechnische Normung Comite Europeen de Normalisation Electrotechnique
Management Centre: Avenue Marnix 17 B - 1000 Brussels
Foreword
This European Standard was prepared by SC 9XC Electric supply and earthing systems for publictransport equipment and ancillary apparatus (Fixed installtions) of Technical Committee CENELEC TC 9X Electrical and electronic applications for railways. It was submitted to the formal vote and wasapproved by CENELEC as EN 50122-2 on 2010-10-01.
This document supersedes EN 50122-2:1998 A1:2002.
Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights.
The following dates were fixed:
latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement (dop) 2011-10-01latest date by which the national standards conflicting with the EN have to be withdrawn (mop) 2013-10-01
This draft European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirementsof EC Directives 96/48/EC (HSR) 2001/16/EC (CONRAIL) and 2008/57/EC (RAIL). See Annex ZZ.
Contents
Scope .52 Normativereferences. Terms and definitions .3 4 Identification of hazards and risks ... ..5 Criteria for stray current assessment and acceptance .75.1 General. .75.2 Criteria for the protection of the tracks ..75.3 Criteria for systems with metal reinforced concrete or metallic structures. ...5.4 Specific investigations and measures ..86 Design provisions.6.1 6.2 Return circuit General. ... .96.3 Non-traction related electrical equipment. .06.4 Tracks of other traction systems .116.5 Return busbar in the substation ..16.6 Level crossings.. ..116.7 Common power supply for tram and trolleybus. ..116.8 Changeover from the mainline to depot and workshop areas. ... ...1Provisions for influenced metallic structures 7.1 General.7.2 Tunnels bridges viaducts and reinforced concrete slab track . ...12.7.3 Adjacent pipes or cables ..137.4 Voltage limiting devices. ...1.8 Protection provisions applied to metallic structures.. ...1.9 Depots and workshops ...10 Tests and measurements... ..1410.1 Principles. 10.2 Supervision of the rail insulation.. ...14 .14Annex A(informative) Measurement of track characteristics ..16A.1 Rail resistance ..16A.2 Conductance per length between running rails and metal reinforced structures.... .1.7A.3 Conductance per length for track sections without civil structure ...8A.4 Local conductance per length for track sections without civil structure ..19A.5 Insulating rail joints . ..1Annex B (informative) Stray current assessment - Rail insulation assessment using rail A.6 Insulating joints between metal reinforced structures ...21potential... ...3B.1 Continuous monitoring of the rail potential. ..23B.2 Repetitive measurements of the rail potential to monitor the conductance ..24
