1、BRITISH STANDARD BS EN 50123-7-2:2003 Railway applications Fixed installations D.C. switchgear Part 7-2: Measurement, control and protection devices for specific use in d.c. traction systems Isolating current transducers and other current measuring devices The European Standard EN 50123-7-2:2003 has
2、 the status of a British Standard ICS 29.280 BS EN 50123-7-2:2003 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 11 July 2003 BSI 11 July 2003 ISBN 0 580 42253 4 National foreword This British Standard is the official English language versi
3、on of EN 50123-7-2:2003. It supersedes BS EN 50123-7-2:1999 which is withdrawn. 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 organization
4、s represented on this subcommittee can be obtained on request 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 Corresponde
5、nce Index”, or by using the “Search” facility of the BSI 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 its
6、elf confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and
7、promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since pub
8、lication Amd. No. Date CommentsEUROPEAN STANDARD EN 50123-7-2 NORME EUROPENNE EUROPISCHE NORM February 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Sta
9、ssart 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 50123-7-2:2003 E ICS 29.280 Supersedes EN 50123-7-2:1999English version Railway applications Fixed installations D.C. switchgear Part 7-2: Measuremen
10、t, control and protection devices for specific use in d.c. traction systems Isolating current transducers and other current measuring devices Applications ferroviaires Installations fixes Appareillage courant continu Partie 7-2: Appareils de mesure, de commande et de protection pour usage spcifique
11、dans les systmes de traction courant continu Transducteurs et autres appareils de mesure de courant Bahnanwendungen Ortsfeste Anlagen Gleichstrom-Schalteinrichtungen Teil 7-2: Mess-, Steuer- und Schutzeinrichtungen in Gleichstrom- Bahnanlagen Messumformer fr Strommessung und andere Strommesseinricht
12、ungen This European Standard was approved by CENELEC on 2002-09-01. 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 bibliograp
13、hical 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
14、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,
15、Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 50123-7-2:2003 - 2 - Foreword This European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport equipment and ancillary apparatus (fixed installations)
16、, of the Technical Committee CENELEC 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 EN 50123-7-2 on 2002-09-01. This European Standard supersedes EN 50123-7-2:1999. The following dates
17、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) 2003-09-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-09-01 This Part 7-2 is to be use
18、d in conjunction with EN 50123-1:2003. _ - 3 - EN 50123-7-2:2003 Contents Page 1 Scope . 4 2 Normative references. 4 3 Definitions 4 4 Service requirements. 4 5 Characteristics . 5 5.1 Electrical characteristics 5 5.2 Mechanical characteristics. 6 6 Information to be exchanged between purchaser and
19、supplier 7 7 Tests 7 7.1 Dielectric tests 7 7.2 Calibration test. 7 7.3 Other tests 8 7.4 EMC tests. 8 EN 50123-7-2:2003 - 4 - 1 Scope This European Standard gives the requirements for isolating current transducers and other current measuring devices used in d.c. railway applications, fixed installa
20、tions. This transducer is normally positioned between the sensor in the live switchboard conductor or rail and the secondary device, giving galvanic insulation between the input and the output. 2 Normative references This European Standard incorporates by dated or undated references, provisions from
21、 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 publications apply to this European Standard only when incorporated in it by amendmen
22、t or revision. For undated references the latest edition of the publication referred to applies (including amendments). See EN 50123-1:2003. 3 Definitions For the purposes of this European standard the terms and definitions given in EN 50123-1 apply. 4 Service requirements Where the equipment descri
23、bed in this standard is mounted on devices or in assemblies covered by the EN 50123 series , then the service conditions of the devices or assemblies apply. In this European standard the pollution degree PD4 and overvoltage categories (see notes to Table 1 of EN 50123-1), as described in EN 50124-1,
24、 are considered to be normal conditions. The normal service requirements are given in Annex B of EN 50123-1. 5 Characteristics 5.1 Electrical characteristics 5.1.1 General The isolating transducer has an insulation level between its primary terminals and secondary terminals which is the same as that
25、 of the main circuit. An isolating transducer shall have an insulation level in accordance with Table 1 of EN 50123-1. - 5 - EN 50123-7-2:2003 Transducers shall be suitable for use providing inputs to measuring devices and/or protection devices. The output impedance, accuracy, linearity of response
26、and phase shift between input and output shall be compatible with its designated application The purchaser shall indicate whether the transducer is to be used for measurement purposes or for protection or both. He shall also indicate the accuracy range desired. The sensor(s) for the current transduc
27、ers shall be of one of the types described in 3.1.8 to 3.1.12 of EN 50123-1. It may be of a design suitable for temporary insertion or permanent connection onto live primary circuit conductors. The frequency range shall be from d.c. to a minimum of 1 kHz. A current transducer shall operate correctly
28、 up its continuous thermal current I th , which shall be at maximum ambient temperature, at two times the specified main or primary circuit thermal current and shall be able to withstand I Ncwof the main or primary circuit for the time specified. Rated accuracy, within specified tolerances, shall ap
29、ply within the range from 0 to 1,2 I thfor measuring transducers and in the range from 0 to 2 I thfor protection transducers. Performance requirements different from these shall be by agreement between supplier and purchaser. NOTE Attention should be paid to EMC emissions and immunity in locating th
30、e sensor. Preferred secondary signal may either be a voltage in the range from 0 V to 10 V or a current in the range from 4 mA to 20 mA (e.g. 0 mA to 20 mA, 4 mA to 20 mA or 0 mA to 10 mA). When the transducer uses an auxiliary power supply, means shall be provided to indicate that the power supply
31、is not available. If the principle of operation of the transducer is electronic, then self-checking means shall be provided. The need for this requirement depends on the duty of the transducer and shall be specified by the purchaser. Due consideration shall be given to providing adequate protection
32、of the transducer and associated circuits against overloads and short circuits. Care shall be taken that inductive circuits can alter the inherent di/dt response. 5.1.2 Isolating transducer requirements The following requirements characterise the isolating transducer: a) rated input voltage (V); b)
33、rated insulation voltage (V); c) input signal at 100 % signal (mV); d) input impedance at 100 % signal ( ); e) output signal at 100 % signal (mA or mV or V); f) output impedance at 100 % signal ( ); g) accuracy range at 100 % signal (%); EN 50123-7-2:2003 - 6 - h) accuracy ( %); i) upper limit of re
34、sponse frequency (kHz); j) power frequency withstand (60 s) (kV); k) impulse withstand voltage (if applicable) (kV cr ); l) power consumption (W); m) auxiliary voltage (V). n) loss of auxiliary power signal 1)o) electronic circuitry self checking required 1)5.1.3 d.c. shunt requirements The followin
35、g requirements characterise the shunt: a) normal current rating (A); b) rated insulation voltage 2)(V); c) output signal at I th(V); d) accuracy range based on I th(%); e) accuracy ( %); f) rated short-time withstand current I Ncw(A); g) upper limit of response frequency (kHz); h) overload capabilit
36、y ; i) ambient temperature to which rating refers (C). 5.1.4 Hall effect sensor requirements The same as for an isolating transducer with the addition of p) number of Hall effect devices. 5.2 Mechanical characteristics The enclosure of the transducer may be metal enclosed, or of insulating material.
37、 Both may have earthed metal mounting feet. Mechanical stress caused by the operation of other devices within the switchgear or adjacent to the transducer shall not cause damage or loss of accuracy to the transducer. Transducers intended for location near live conductors shall be provided with an in
38、sulated enclosure, unless alternative arrangements are agreed with the purchaser. 1)Requirement to be specified by the purchaser. 2)Refers to insulation mounting, if any. - 7 - EN 50123-7-2:2003 6 Information to be exchanged between purchaser and supplier The supplier shall give the requirements spe
39、cified in 5.1.2, 5.1.3 and 5.1.4 as far as applicable and the purchaser shall confirm or complement these requirements as necessary. If requested the following information shall be provided by the supplier in addition to the requirements specified above: a) insulation levels of the circuits; b) shor
40、t time withstand current of the primary circuit I Ncwin kA; c) overload capability (current and time); d) linearity range and tolerances; e) thermal deviation of the secondary signal expressed per C; f) di/dt correctly followed in A/s; g) residual output (expressed in %) of the last signal, if any,
41、value of the offset current (in order to control the transducer); h) if inversion of polarity in the auxiliary supply may damage the device; i) burden; j) value of the input impedance of the device connected to the secondary side of the transducer. A rating plate shall be provided with at least the
42、following: conversion ratio, insulation level, serial number and manufacturers name. 7 Tests 7.1 Dielectric tests Power-frequency voltage withstand test shall be a routine test. The voltage shall be applied between all auxiliary power supply terminals and the primary side and between the secondary t
43、erminals and the auxiliary power supply. An impulse test for transducers used on systems having U Nmgreater than 2,5 kV, is a type test made between input terminals and all other terminals including the transducer mounting feet. Power frequency test values shall be taken from Table 1 of EN 50123-1.
44、7.2 Calibration test This is a routine test. Linearity shall be checked against the declared accuracy in the range from 0 and 1, 2 I thwhen used for measurement purposes or in the declared accuracy range (at least from 0 to 2 I th )when used for protection purposes. EN 50123-7-2:2003 - 8 - The purpo
45、se of this test is to verify declared accuracy over the specified operating range and record variations. When voltage variations of the auxiliary can affect the calibration, the test shall be repeated at the maximum auxiliary supply voltage limits. 7.3 Other tests A type test shall be carried out to
46、 check that di/dt is correctly followed. This may be performed as a high frequency input current test, where the di/dt at I = 0 is to be at least equal to the highest di/dt response required by the detecting device. 7.4 EMC tests EMC tests shall be in accordance with the EN 50121 series. blankBS EN
47、50123-7-2:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Br
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