1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 50122-2:2010Incorporating February 2011 and March 2011 corrigendaRailway applications Fixed installations Electrical safety, earthing and the return circuitPart 2: Provisio
2、ns against the effects of stray currents caused by d.c. traction systemsBS EN 50122-2:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50122-2:2010. It supersedes BS EN 50122-2:1999 which is withdrawn.The UK participation in its preparation was entrusted to
3、Technical Committee GEL/9/3, Railway Electrotechnical Applications - Fixed Equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for it
4、s correct application. BSI 2011 ISBN 978 0 580 ICS 29.120.50; 29.280 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2010. Amendments issued since pu
5、blicationDate Text affected74983 428 February 2011 Correction to font errors in PDF Correction Februarys Corrigendum 31 March 2011EUROPEAN STANDARD EN 50122-2 NORME EUROPENNE EUROPISCHE NORM October 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation E
6、lectrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50122-2:2010 E ICS 29.120.50; 29.280 Supersedes EN 50122-
7、2:1998 + corr. Aug.2001 + A1:2002English version Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 2: Provisions against the effects of stray currents caused by d.c. traction systems Applications ferroviaires - Installations fixes - Scurit lectriq
8、ue, mise la terre et circuit de retour - Partie 2: Mesures de protection contre les effets des courants vagabonds issus de la traction lectrique courant continu Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und Rckleitung - Teil 2: Schutzmanahmen gegen Streustromwirkungen durc
9、h Gleichstrom-Zugfrderungssysteme This European Standard was approved by CENELEC on 2010-10-01. 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-
10、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
11、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, Croatia, Cyprus, the Czech Republic, Denmark, Estonia,
12、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. EN 50122-2:2010 2 Foreword This European Standard was prepared by SC 9X
13、C, 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 submitted to the formal vote and was approved by CENELEC as EN 50122-2 on 2010-10-01
14、. 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 of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: lat
15、est date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-10-01 This draft European Standard has been prepare
16、d under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directives 96/48/EC (HSR), 2001/16/EC (CONRAIL) and 2008/57/EC (RAIL). See Annex ZZ. _ 3 EN 50122-2:2010 Contents 1 Scope . 52 Normative references . 53 Terms
17、 and definitions 64 Identification of hazards and risks . 65 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 . 85.4 Specific investigations and measure
18、s 86 Design provisions . 96.1 General . 96.2 Return circuit 96.3 Non-traction related electrical equipment .106.4 Tracks of other traction systems 116.5 Return busbar in the substation .116.6 Level crossings .116.7 Common power supply for tram and trolleybus 116.8 Changeover from the mainline to dep
19、ot and workshop areas 117 Provisions for influenced metallic structures .117.1 General .117.2 Tunnels, bridges, viaducts and reinforced concrete slab track 127.3 Adjacent pipes or cables 137.4 Voltage limiting devices 138 Protection provisions applied to metallic structures139 Depots and workshops 1
20、410 Tests and measurements .1410.1 Principles 1410.2 Supervision of the rail insulation .14Annex A (informative) Measurement of track characteristics .16A.1 Rail resistance 16A.2 Conductance per length between running rails and metal reinforced structures .17A.3 Conductance per length for track sect
21、ions without civil structure 18A.4 Local conductance per length for track sections without civil structure .19A.5 Insulating rail joints .21A.6 Insulating joints between metal reinforced structures 21Annex B (informative) Stray current assessment Rail insulation assessment using rail potential .23B.
22、1 Continuous monitoring of the rail potential .23B.2 Repetitive measurements of the rail potential to monitor the conductance .24EN 50122-2:2010 4 Annex C (informative) Estimation of stray current and impact on metal structures 25C.1 Estimation of the stray currents passing from the running rails to
23、 the earth .25C.2 Estimation of the longitudinal voltage in metal reinforced structures .26Annex ZZ (informative) Coverage of Essential Requirements of EC Directives .28Bibliography 29Figures Figure A.1 Measurement of the rail resistance for a rail of 10 m length 16Figure A.2 Measuring arrangement f
24、or the conductance per length GRSbetween rails and metal reinforced structure 17Figure A.3 Determination of the conductance per length GREfor track sections without civil structures 18Figure A.4 Measuring arrangement for the local conductance per length .19Figure A.5 Test of insulating rail joints .
25、21Figure A.6 Test of insulating joints in metal reinforced structures .22Figure B.1 Continuous monitoring of the rail potential .23 5 EN 50122-2:2010 1 Scope This European Standard specifies requirements for protective provisions against the effects of stray currents, which result from the operation
26、 of d.c. traction systems. As experience for several decades has not shown evident corrosion effects from a.c. traction systems and actual investigations are not completed, this European Standard only deals with stray currents flowing from a d.c. traction system. This European Standard applies to al
27、l metallic fixed installations which form part of the traction system, and also to any other metallic components located in any position in the earth, which can carry stray currents resulting from the operation of the railway system. This European Standard applies to all new d.c. lines and to all ma
28、jor revisions to existing d.c. lines. The principles may also be applied to existing electrified transportation systems where it is necessary to consider the effects of stray currents. It provides design requirements to allow maintenance. The range of application includes: a) railways, b) guided mas
29、s transport systems such as: 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) trolleybus systems, and 5) magnetically levitated systems, which use a contact line system, c) material transportation systems. This European Standard does not apply to: d) mine traction systems
30、in underground mines, e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly from the contact line system and are not endangered by the traction power supply system, f) suspended
31、 cable cars, g) funicular railways. This European Standard does not specify working rules for maintenance. 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, t
32、he latest edition of the referenced document (including any amendments) applies. EN 50122-1:2010, Railway applications Fixed installations Electrical safety, earthing and the return circuit Part 1: Protective provisions against electric shock EN 50122-3:2010, Railway applications Fixed installations
33、 Electrical safety, earthing and the return circuit Part 3: Mutual interaction of a.c. and d.c. traction systems EN 50162:2004, Protection against corrosion by stray current from direct current systems EN 50163, Railway applications Supply voltages of traction systems EN 50122-2:2010 6 3 Terms and d
34、efinitions For the purposes of this document, the terms and definitions given in EN 50122-1:2010 apply. 4 Identification of hazards and risks D.C. traction systems can cause stray currents which could adversely affect both the railway concerned and/or outside installations, when the return circuit i
35、s not sufficiently insulated versus earth. The major effects of stray currents can be corrosion and subsequent damage of metallic structures, where stray currents leave the metallic structures. There is also the risk of overheating, arcing and fire and subsequent danger to persons and equipment both
36、 inside and outside the railway or trolley bus system. The following systems, which can produce stray currents, shall be considered: d.c. railways using running rails carrying the traction return current including track sections of other traction systems bonded to the tracks of d.c. railways; d.c. t
37、rolleybus systems which share the same power supply with a system using the running rails carrying the traction return current; d.c. railways not using running rails carrying the traction return current, where d.c. currents can flow to earth or earthing installations. All components and systems whic
38、h can be affected by stray currents shall be considered such as: running rails, metallic pipe work, cables with metal armour and/or metal shield, metallic tanks and vessels, earthing installations, reinforced concrete structures, buried metallic structures, signalling and telecommunication installat
39、ions, non-traction a.c. and d.c. power supply systems, cathodic protection installations. Any provisions employed to control the effects of stray currents shall be checked, verified and validated according to this European Standard. The system design shall be completed sufficiently early that the re
40、sults can be taken into account in the essential system parameters, which influence the stray current effects, like the spacing of the substations and in the design of the civil structures, see also 5.4. The entity responsible for the design and erection of the railway infrastructure shall make sure
41、 that electrical requirements for railway related civil structures are met. In case of major revisions of existing lines the effects on the stray current situation shall be assessed by calculation and/or by measurements. If stray current provisions affect electrical safety, protective provisions aga
42、inst electric shock according to EN 50122-1 shall take precedence over provisions against the effects of stray currents. 7 EN 50122-2:2010 5 Criteria for stray current assessment and acceptance 5.1 General The amount of stray currents and their effects depend on the overall system design of the trac
43、tion power supply. Stray currents leaving the return circuit can affect the return circuit itself and neighbouring installations, see Clause 4. Beside to the operating currents, the most important parameters for the amount of stray current are: the conductance per length of the tracks and the other
44、parts of the return circuit, the distance of the substations, the longitudinal resistance of the running rails, spacing of cross bonds. If the railway system meets the requirements and measures of this European Standard, the system is assumed to be acceptable from the stray current point of view. 5.
45、2 Criteria for the protection of the tracks The most important influencing variable for stray currents leaving the tracks is the conductance per unit length between track and earth. The corrosion rate is the main aspect for the assessment of risk. The rail potential provides the main information abo
46、ut the relevant parameters, which represent the stray currents. These parameters are the traction currents, the longitudinal resistance of the running rails, the resistance to earth and the length of the feeding sections. The precondition for this proceeding is that there is no direct electrical con
47、nection either accidental or intended to earthing installations. Experience proves that there is no damage in the tracks over a period of 25 years, if the average stray current per unit length does not exceed the following value: Imax= 2,5 mA/m (average stray current per length of a single track lin
48、e). NOTE 1 For a double track line the value for the maximum average stray current should be multiplied by two. For more than two tracks the value increases accordingly. For the averaging process, only the total positive parts of the stray current over 24 h or multiples are considered. If the following values for the conductance per length GREand average rail potential UREare not exceeded during the system life-time, further investigations according to 5.4 need not be performed. GRE 0,5 S/km per track and URE + 5 V for open formation (1) GRE 2,5 S/km per track and URE + 1
