1、BRITISH STANDARD BS EN 50123-7-3:2003 Railway applications Fixed installations D.C. switchgear Part 7-3: Measurement, control and protection devices for specific use in d.c. traction systems Isolating voltage transducers and other voltage measuring devices The European Standard EN 50123-7-3:2003 has
2、 the status of a British Standard ICS 29.280 BS EN 50123-7-3:2003 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 42254 2 National foreword This British Standard is the official English language versi
3、on of EN 50123-7-3:2003. It supersedes BS EN 50123-7-3:1999 which is withdrawn.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 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date
8、 CommentsEUROPEAN STANDARD EN 50123-7-3 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 Stassart 35, B - 1050 Bru
9、ssels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50123-7-3:2003 E ICS 29.280 Supersedes EN 50123-7-3:1999English version Railway applications Fixed installations D.C. switchgear Part 7-3: Measurement, control and protect
10、ion devices for specific use in d.c. traction systems Isolating voltage transducers and other voltage measuring devices Applications ferroviaires Installations fixes Appareillage courant continu Partie 7-3: Appareils de mesure, de commande et de protection pour usage spcifique dans les systmes de tr
11、action courant continu Transducteurs et autres appareils de mesure de la tension Bahnanwendungen Ortsfeste Anlagen Gleichstrom-Schalteinrichtungen Teil 7-3: Mess-, Steuer- und Schutzeinrichtungen in Gleichstrom- Bahnanlagen Messumformer fr Spannungsmessung und andere Spannungsmesseinrichtungen This
12、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 bibliographical refer
13、ences 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 m
14、ember 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,
15、 Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 50123-7-3:2003 - 2 - Foreword This European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport equipment and ancillary apparatus (fixed installations), of the Te
16、chnical 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 50123-7-3 on 2002-09-01. This European Standard supersedes EN 50123-7-3:1999. The following dates were fixed:
17、 - 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 used in conjun
18、ction with EN 50123-1:2003. _ - 3 - EN 50123-7-3:2003 Contents Page 1 Scope . 4 2 Normative references. 4 3 Definitions 4 4 Service requirements. 4 5 Characteristics . 4 5.1 Electrical characteristics 4 5.2 Mechanical characteristics. 6 6 Information to be exchanged between purchaser and supplier 6
19、7 Tests 7 7.1 Dielectric tests 7 7.2 Calibration test. 7 7.3 EMC tests. 7 EN 50123-7-3:2003 - 4 - 1 Scope This European Standard gives the requirements for isolating voltage transducers and other voltage measuring devices used in d.c. railway applications, fixed installations. This transducer is nor
20、mally positioned between the voltage sensor on 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 other publications.
21、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 amendment or revision. For un
22、dated 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 described in this standard
23、 is mounted on devices or in assemblies covered by the EN 50123 series, the service requirements of the devices or assemblies apply. In this European standard the pollution degree PD4 and overvoltage categories (see Table 1, notes of EN 50123-1), as described in EN 50124-1, are considered to be the
24、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 of the main circuit.
25、An isolating transducer shall have an insulation level in accordance with Table 1 of EN 50123-1. - 5 - EN 50123-7-3:2003 Transducers intended for location near live conductors shall be provided with an insulated enclosure, unless alternative arrangements are agreed with the purchaser. Its output sig
26、nal shall preferably be one of the appropriate devices described in 3.1.8 to 3.1.12 of EN 50123-1. Transducers shall be suitable for use providing inputs to measuring devices and/or protection devices. The output impedance, accuracy, linearity of response and phase shift between input and output sha
27、ll be compatible with its designated application. The frequency range shall be from d.c. to a minimum of 1 kHz. Based on the rated voltage assigned to the device U Ne , the voltage transducer shall be able to operate correctly at rated accuracy in the range 0 U Neto 1,2 U Newithin the defined tolera
28、nce. It is recommended that U Neis assigned higher or at least equal to U max2(see EN 50163). The input impedance on the primary side shall be 1 M or as agreed with the purchaser. NOTE 1 It is recommended that a fuse (preferably accessible from outside the live compartment to provide safe access whe
29、n the main circuit is still energised) is fitted in the transducer or divider primary connection. It is suggested that for systems connected to the transducer or divider secondary, where both the live and return conductors are unearthed, a second fuse/removable link is fitted between the transducer
30、or divider and return conductor. NOTE 2 Attention is required to be paid to EMC emissions and immunity in locating the 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 1
31、0 mA). When the transducer uses an auxiliary power supply, means shall be provided to indicate that the power supply 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 t
32、ransducer and shall be specified by the purchaser. Due consideration shall be given to providing adequate protection of the transducer and associated circuits against overloads and short circuits. 5.1.2 Isolating transducer requirements The following requirements characterise the isolating transduce
33、r: a) rated input voltage (V); b) 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 (%); h) accuracy ( %); i) upper l
34、imit of response frequency (kHz); EN 50123-7-3:2003 - 6 - j) power frequency withstand voltage (60 s) (kV); k) impulse withstand (if applicable) (kV cr ); l) power consumption (W); m) auxiliary voltage (V). 5.1.3 Divider requirements The following requirements characterise the divider and shall be s
35、pecified: a) rated insulation voltage (V); b) output signal at U Nm(V); c) total divider resistance ( ); d) footing divider resistance ( ); e) accuracy range based on U Nm(%); f) accuracy ( %); g) upper limit of response frequency (kHz); h) burden (VA). 5.2 Mechanical characteristics The enclosure o
36、f the transducer may be metal enclosed, or of insulating material. Both may have earthed metal mounting feet. Mechanical stress caused by operation of other acting devices within the switchgear or adjacent to the transducer shall not cause damage or loss of accuracy to the transducer. 6 Information
37、to be exchanged between purchaser and supplier The supplier shall give the requirements specified in 5.1.2 and 5.1.3 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 additio
38、n to the requirements specified above: a) insulation levels of the circuits; b) accuracy range and tolerances; c) overvoltage capability; d) input impedance; e) output impedance; f) input impedance of the device connected to the secondary side of the transducer; g) thermal deviation of the secondary
39、 signal expressed per C; h) if inversion of polarity in the auxiliary supply may damage the device; i) burden. - 7 - EN 50123-7-3:2003 A rating plate shall be provided with at least the following: conversion ratio, insulation level, serial number and manufacturers name. 7 Tests 7.1 Dielectric tests
40、Power-frequency voltage withstand tests shall be a routine test. The voltage shall be applied between all auxiliary power supply terminals and the primary side and between the secondary terminals and the auxiliary power supply. An impulse test for transducers used on systems having U Nm greater than
41、 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. 7.2 Calibration test This is a routine test. Linearity shall be checked against the declared accuracy in the rang
42、e from 0 U Nmto 1,2 U Nm . The purpose of this test is to verify declared accuracy over the specified operating range and record variations. When voltage variations of the auxiliary supply can affect the calibration, the test shall be repeated at the maximum supply voltage limits. 7.3 EMC tests EMC
43、tests shall be in accordance with the EN 50121 series. BS EN 50123-7-3:2003 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 internati
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