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1、BRITISH STANDARD BS EN 50122-2:1999 Incorporating Corrigendum No. 1 and Amendment No. 1 Railway applications Fixed installations Part 2: Protective provisions against the effects of stray currents caused by d.c. traction systems The European Standard EN 50122-2:1998, with the incorporation of amendm
2、ent A1:2002, has the status of a British Standard ICS 29.120.50; 29.280 ? Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 50122-2:1999 This British Standard, having been prepared under the direction of the
3、 Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 May 1999 BSI 13 November 2002 ISBN 0 580 32371 4 National foreword This British Standard is the English language version of EN 50122-2:1998, including Corrigendum August 2001
4、and amendment A1:2002. The UK participation in its preparation was entrusted by Technical Committee GEL/9, Railway electrotechnical applications, to Subcommittee GEL/9/3, Fixed equipment, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on req
5、uest to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “ International Standards Correspondence Index” , or by using the “ Search” facility of the B
6、SI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquir
7、ers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises
8、a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Amendments issue
9、d since publication Amd. No.DateComments 13471 Corrigendum No. 1 6 March 2002 1396513 November 2002 Indicated by a sideline Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROP
10、ISCHE NORM EN 50122-2 May 1998 + A1 April 2002 ICS 29.120.50; 45.020Incorporating corrigendum August 2001 Descriptors: railway fixed equipment, electric traction, direct current, safety, safety measures, corrosion prevention, stray current corrosion, cathodic protection English version Railway appli
11、cations Fixed installations Part 2: Protective provisions against the effects of stray currents caused by d.c. traction systems (includes amendment A1:2002) Applications ferroviaires Installations fixes Partie 2: Mesures de protection contre les effets des courants vagabonds issus de la traction lec
12、trique courant continu (inclut l amendement A1:2002) Bahnanwendungen Ortsfeste Anlagen Teil 2: Schutzmanahmen gegen die Auswirkungen von Streustrmen verursacht durch Gleichstrombahnen (enthlt nderung A1:2002) This European Standard was approved by CENELEC on 1998-04-01. Amendment A1 was approved by
13、CENELEC on 2002-04-01. 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-to-date lists and bibliographical references concerning such national sta
14、ndards 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 under the responsibility of a CENELEC member into its own language and no
15、tified to the Central Secretariat has the same status as the official versions. CENELEC members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
16、land and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and b
17、y any means reserved worldwide for CENELEC members. Ref. No. EN 50122-2:1998 + A1:2002 E Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 50122-2:1998 BSI 13 November 2002 2 Foreword This European Standard was
18、 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. The text of the draft was submitted to the formal vote and was approved b
19、y CENELEC as EN 50122-2 on 1998-04-01. The following dates were fixed: Foreword to amendment A1 This amendment to the European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport equipment and ancillary apparatus (fixed installations), of Technical Committee CE
20、NELEC TC 9X, Electrical and electronic applications for railways. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50122-2:1998 on 2002-04-01. The following dates were fixed: Contents Page Foreword2 1Scope3 2Normative references
21、3 3Definitions3 4General7 5Traction power supply system7 6Track system8 7Influenced structures9 8Protection methods applied to metallic structures11 Annex A (informative) Measurement of the conductance per unit length of the running rails12 Annex B (informative) Examples for protection methods appli
22、ed to metallic structures16 Annex C (informative) Estimation of the longitudinal voltage in reinforced railway structures17 Annex D (informative) Bibliography18 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop)
23、 1999-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1999-03-01 latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 2003-04-01 latest date by which the
24、national standards conflicting with the amendment have to be withdrawn(dow) 2005-04-01 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 50122-2:1998 BSI 13 November 2002 3 1 Scope This standard specifies req
25、uirements for protective provisions against the effects of stray currents which result from the operation 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 standard only dea
26、ls with stray currents flowing from a d.c. traction system. This standard applies to all 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 may carry stray currents resulting from the operation of
27、 the railway system. This standard applies to all new electrification of a d.c. railway system. The principles may also be applied to existing electrified systems where it is necessary to consider the effects of stray currents. The range of application includes: railways; guided mass transport syste
28、ms such as: tramways, elevated and underground railways, mountain railways, trolleybus systems and magnetic levitated systems; material transportation systems. This standard does not apply to: a) mine traction systems in underground mines; b) cranes, transportable platforms and similar transportatio
29、n 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; c) suspended cable cars; d) funicular railways; e) maintenance work. 2 Normative references Th
30、is European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publ
31、ications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 129541), Cathodic protections of buried or immersed metallic structures General principles. EN 50122-1, Railway applica
32、tions Fixed installations Part 1: Protective provisions relating to electrical safety and earthing. IEC 60050(826), International Electrotechnical Vocabulary Chapter 826: Electrical installations of buildings. 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 stra
33、y current a current which follows paths other than the intended paths 3.2 stray current zone zone in which currents may be exchanged between a d.c. traction system and metallic structures or earth NOTESuch a stray current zone may extend over a distance of a few kilometres. 1)In preparation. License
34、d Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 50122-2:1998 4 BSI 13 November 2002 3.3 corrosion the chemical or electrochemical reaction of a metal with its environment, resulting in its progressive degradation
35、or destruction NOTEThis standard deals with corrosion by electrochemical reaction. 3.4 cathodic protection a method to protect a metal from corrosive attack by causing a direct current to flow from its electrolytic environment into the entire metal surface 3.4.1 polarized electric drainage; polarize
36、d drainage a form of drainage of stray currents in which the connection between a protected structure and a traction system includes a unidirectional device or devices such as rectifier or a relay and contactor 3.4.2 forced drainage a form of drainage in which the connection between a protected stru
37、cture and a traction system includes an independent source of direct current 3.4.3 impressed current installation a rectifier or other d.c. source supplying direct current to a protected structure in order to achieve the necessary protection potential 3.5 protection potential the more negative level
38、 to which the potential of a metallic structure, with respect to a specified reference electrode in an electrolytic environment, has to be depressed in order to effect cathodic protection of the structure 3.6 return circuit all conductors which form the intended path for the traction return current
39、and the current under fault conditions NOTEThe conductors may be for example: running rails; return conductor rails; return conductors; return cables. 3.7 track return system a system in which the running rails form a part of the return circuit 3.8 return conductor conductor, which parallels the tra
40、ck and which is connected to the running rails at periodic intervals 3.9 return conductor rail a conductor rail used instead of the running rails for the traction return current 3.10 return cable an insulated return conductor forming part of the return circuit and connecting the rest of the return c
41、ircuit to the substation Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 50122-2:1998 BSI 13 November 2002 5 3.11 return cable busbar a busbar in substations at which return cables terminate 3.12 d.c. (trac
42、tion) substation an installation the main function of which is to supply a contact line system, at which the voltage of a primary supply system, is converted to the voltage of the contact line 3.13 traction return current the sum of the traction currents returning to the supply source NOTE The suppl
43、y source may be a regenerating vehicle. 3.14 rail joint bond a conductor ensuring the electrical continuity of a rail at a joint 3.15 insulated rail joint a mechanical rail joint which longitudinally separates the rail electrically 3.16 rail-to-rail cross bond an electrical bond that interconnects t
44、he running rails of the same track 3.17 track-to-track cross bond an electrical bond that interconnects tracks 3.18 earth the conductive mass of the earth, whose electric potential at any point is conventionally taken as zero IEC 50, 826-04-01 3.19 earth electrode a conductive part or a group of con
45、ductive parts in intimate contact with and providing an electrical connection with earth IEC 50, 826-04-02 3.20 tunnel earth the electrical interconnection of the reinforcing rods of reinforced concrete tunnels, and in the case of other modes of construction, the conductive interconnection of the me
46、tallic parts of the tunnel 3.21 structure earth the electrical interconnection of the reinforcing rods of structures, and in the case of other modes of construction, the conductive interconnection of the metallic parts. Examples are reinforced railway structures such as bridges, viaducts and reinfor
47、ced trackbed 3.22 rail to earth resistance the electrical resistance between the running rails and the earth NOTE 1For d.c. traction systems in tunnels the measurement is made between the running rails and tunnel earth. NOTE 2In this standard the rail to earth resistance refers to a single-track ins
48、tallation, unless otherwise explicitly specified. 3.23 conductance per unit length the reciprocal value of the rail to earth resistance per unit of length NOTEIn this standard the conductance per unit length refers to a single-track installation, unless otherwise explicitly specified. Licensed Copy:
49、 Institute Of Technology Tallaght, Institute of Technology, Mon Jul 09 10:28:05 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 50122-2:1998 6 BSI 13 November 2002 3.24 equipotential bonding electrical connection putting various exposed conductive parts and extraneous conductive parts at a substantially equal potential IEC 50, 826-04-09 3.25 equipotential bonding conductor a protective conduct