EN 50238-1:2003

STANDARDŽelezniške naprave – Združljivost voznih sredstev in sistemov za detekcijo vlakaRailway applications - Compatibility between rolling stock and train detection systems©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 50238:2003(en)ICS29.280; 45.060.10

EUROPEAN STANDARD
EN 50238 NORME EUROPÉENNE EUROPÄISCHE NORM
February 2003 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50238:2003 E
ICS 29.180; 45.060.10
English version
Railway applications –
Compatibility between rolling stock
and train detection systems
Applications ferroviaires –
Compatibilité entre matériel roulant
et systèmes de détection de train
Bahnanwendungen –
Kompatibilität zwischen Fahrzeugen
und Gleisfreimeldesystemen
This European Standard was approved by CENELEC on 2002-12-01. 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 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 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

EN 50238:2003 – 2 –
Foreword This European Standard was prepared by SC 9XA, Communication, signalling and processing systems, 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 by CENELEC as EN 50238 on 2002-12-01.
This European Standard was prepared under a mandate given to CENELEC by the European Commisssion and the European Free Trade Association and supports the essential requirements of Directive 96/48/EC.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-12-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-12-01
This European Standard is intended to be read in conjunction with the EN 50121 series.
Annexes designated “informative” are given for information only. In this standard annexes A, B, C and D are informative.
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– 3 – EN 50238:2003 Contents
Page Introduction.5 1 Scope.5 2 Normative references.7 3 Definitions.7 4 Acceptance process.8 4.1 Overview.8 4.2 Responsibilities.9 4.3 Acceptance process.9 4.4 Compatibility case.11 4.5 Quality management.11 4.6 Route identification.11 4.7 Characterisation.11 4.8 Tests .12 4.9 Compatibility analysis.12 4.10 Certificate of acceptance.13 5 Characterisation of train detection systems.13 5.1 Objective of procedure.13 5.2 Physical compatibility.13 5.3 Electromagnetic compatibility.14 5.4 Factor of safety.17 5.5 Track circuit susceptibility.17 5.6 Wheel detector susceptibility.17 5.7 Train detection system gabarit.18 5.8 Interference signal generated by rolling stock and substations.18 5.9 Test report .19 6 Characterisation of rolling stock.20 6.1 Objectives of procedure.20 6.2 Description of rolling stock and factors affecting its characteristics.20 6.3 Configuration (design status).20 6.4 Test plan.20 6.5 Test report.22 6.6 Archive of test results.22 7 Characterisation of traction power supply systems.22 7.1 Objective.22 7.2 D.C. traction power supplies.23 7.3 A.C. traction power supplies.23

EN 50238:2003 – 4 –
Annex A (informative)
Guidelines for the determination of
susceptibility of train detection systems .24 Annex B (informative)
Guidelines for the measurement of rolling stock characteristics.32 Annex C (informative)
Factors affecting rolling stock characteristics.34 Annex D (informative)
D.C. traction power supplies.35 Figure 1 – Sources of electromagnetic interference.4 Figure 2 – The parties concerned in the acceptance process.8 Figure 3 – The acceptance process.9 Figure 4 – Relationship between gabarit and permissible interference.11 Figure A.1 – Interference mechanism with rails intact.23 Figure A.2 – Interference mechanism with self-revealing broken rail.23 Figure A.3 – Interference mechanism with unrevealed broken rail.24 Figure A.4 – Double rail track circuit.25 Figure A.5 – Double rail track circuit with broken rail.25 Figure A.6 – Interference mechanism due to voltage between axles – Case 1.26 Figure A.7 – Interference mechanism due to voltage between axles – Case 2.26 Figure A.8 – Effect of inter-vehicle current.27 Figure A.9 – Equivalent circuit for previous figure.27 Figure A.10 – Example of radiated interference.28 Figure A.11 – Sensitive zone of wheel detector.29 Figure B.1 – Example of system for measurement of interference currents.31 Figure D.1 – Rolling stock with DC supply.35 Figure D.2 – Circulation of interference current generated by rolling stock.35 Figure D.3 – Circulation of interference current generated by the substation.35

– 5 – EN 50238:2003 Introduction This European Standard defines a process to obtain the assurance that specific rolling stock operating on a specific route does not interfere with train detection systems installed on this route.
Compatibility problems between train detection systems and rolling stock are a significant obstacle to cross-acceptance of rolling stock in Europe. Unfortunately it is not possible to establish general rules for the maximum levels of interference allowed, valid for every country. This is due to the great diversity of rolling stock, power supply and return current systems, and train detection systems installed in Europe. This diversity leads to consideration of the problem of compatibility of rolling stock and train detection systems for specific routes to avoid unnecessarily restrictive specifications.
Compatibility is determined by both physical and electromagnetic considerations. With regard to EMC, the need is not for general values for maximum levels of interference permitted, but for convenient methods by which to specify the level of interference allowed for operation on specific routes.
Interference may be caused by − rail currents, − electromagnetic fields, − differential voltage between axles,
as shown in Figure 1:
Rail currenttransfer functionsElectromagnetic fieldtransfer functionsTrack circuitOthersWheeldetectorFeederstation
Figure 5 – Sources of electromagnetic interference
In practice, the susceptibility of the system is determined by − the sensitivity of individual components of the system, − the application of the components, i.e. the configuration of the system.
Therefore the problems concerning track circuits and axle counters or wheel detection systems will be looked at separately.

EN 50238:2003 – 6 –
For determining the susceptibility of signalling systems, laboratory/simulation testing methods as well as methods to conduct tests on the “real railway” are proposed. Modelling enables worst-case conditions to be simulated. In addition, particular test sites are used because, from experience, they are known to provide the test evidence required. Then, taking account of the experience of the railways, it is possible to establish a general method for determining the susceptibility of train detection systems, described in this European Standard.
Before measuring the interference level on rolling stock, a sufficient knowledge of the electric circuit diagram of the power equipment is required, e.g. switching frequencies of on-board static converters, type of regulation used for power converters, resonant frequency of each filter, operating limits under high and low supply voltages, downgraded modes of operation etc.

– 7 – EN 50238:2003 1 Scope The scope of this European Standard is to describe a procedure for mutual acceptance of rolling stock to run over specific routes. It describes the methods of measurement of interference currents, the methods of measurement of the susceptibility of train detection systems, the characterisation of traction power supplies and the procedure for acceptance. The result of the acceptance procedure is a structured justification document referred to as a “compatibility case”, which documents the evidence that the conditions for compatibility have been satisfied.
This European Standard is not generally applicable to those combinations of rolling stock, traction power supply and train detection system which were accepted as compatib
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