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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 50123-7-2:1999 The
2、European Standard EN 50123-7-2:1999 has the status of a British Standard ICS 29.200; 29.280 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Railway applications Fixed installations d.c. switchgear Part 7: Measurement, control and protection devices for specific use in d.c. tra
3、ction systems Section 2: Isolating current transducers and other current measuring devices Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 06:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Electrotechnical Sector Committ
4、ee, was published under the authority of the Standards Committee and comes into effect on 15 December 1999 BSI 12-1999 ISBN 0 580 32684 5 BS EN 50123-7-2:1999 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the English language version of EN 50123-
5、7-2:1999. 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: aid enquirers to understand the text; present to the responsible European committee any enqu
6、iries 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. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The
7、British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A Britis
8、h Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
9、cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 06:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CENELEC European
10、 Committee for Electrotechnical Standardization Comite Europe en de Normalisation Electrotechnique Europa isches Komitee fu r Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1999 CENELEC All rights of exploitation in any form and by any means reserved worldwide for
11、 CENELEC Members. Ref. No. EN 50123-7-2:1999 E EUROPEAN STANDARDEN 50123-7-2 NORME EUROPE ENNE EUROPA ISCHE NORM March 1999 ICS 29.280 English version Railway applications Fixed installations d.c. switchgear Part 7: Measurement, control and protection devices for specific use in d.c. traction system
12、s Section 2: Isolating current transducers and other current measuring devices Applications ferroviaires Installations fixes Accessoires a courant continu Partie 7: Dispositifs de mesurage, de commande et de protection pour usage spe cifique dans les syste mes de traction a courant continu Section 2
13、: Transducteurs de courant disolement et autres dispositifs de mesurage de courant Bahnanwendungen Ortsfeste Anlagen Gleichstrom-Schalteinrichtungen Teil 7: Me-, Steuer- und Schutzeinrichtungen in Gleichstrom-Bahnanlagen Hauptabschnitt 2: Stromwandler und andere Meeinrichtungen This European Standar
14、d was approved by CENELEC on 1998-08-01. 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
15、 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 o
16、wn 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, Iceland, Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal
17、,Spain,Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 06:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 50123-7-2:1999 BSI 12-1999 Foreword This European Standard was prepared by SC9XC, Electric supply and earthing systems for public transp
18、ort 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 by CENELEC as EN 50123-7-2 on 1998-08-01. The following dates were fixed: lat
19、est date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1999-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1999-10-01 This part 7 is divided into sections to cover
20、 an application guide and a number of protecting devices with specific features for d.c. railway applications. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions3 4Service conditions3 5Characteristics 5.1Electrical characteristics3 5.2Mechanical characteristics4 6Infor
21、mation to be exchanged between purchaser and supplier5 7Tests5 7.1Dielectric tests5 7.2Calibration test5 7.3Other tests5 7.4EMC tests5 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 06:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 50123-7-2:1999 BSI 12-1999 Table 1 Insulation le
22、vel UnUNmUNiUNiUa(A)Ua(B)ClearanceClearance ABAB kVkVkVkVkVkVmmmm 0,60,967,23,341012 0,751,289,64,35,21417 0,751,610125,56,51820 1,52,31214,46,57,82226 1,5315188,5102733 34,8253012154554 A: to earth between primary and secondary and against other circuits. B: across the isolating distance if applica
23、ble. The above values are taken assuming that the overvoltage category 3 and PD4 as defined in EN 50124-1 are used. Introduction EN 50123-7 is divided into a number of sections as follows. Section 1: Application guide. Section 2: Isolating current transducers and other current measuring devices. Sec
24、tion 3: Isolating voltage transducers and other voltage measuring devices. This number of sections is subject to future additions as soon as a protection device is considered suitable for standard requirements. Section 1 is a guide and its content is informative. Further sections are normative and a
25、pply with respect to equipment falling within the scope of that section. 1 Scope EN 50123-7-2 gives the requirements for isolating current transducers and other current measuring devices used in d.c. railway applications, fixed installations. This transducer is normally positioned between the sensor
26、 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 reference, provisions from other publications. These normative references are cited at the
27、 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 undated references the latest edition of the
28、publication referred to applies (including amendments). EN 50121-5, Railway applications Electromagnetic compatibility Part 5: Emission and immunity of fixed power supply installations and apparatus. EN 50123-1:1995, Railway applications Fixed installations d.c. switchgear Part 1: General. ENV 50123
29、-7-1:1998, Railway applications Fixed installations d.c. switchgear Part 7: Measurement, control and protection devices for specific use in d.c. traction systems Section 1: Application guide. EN 50124-1, Railway applications Insulation co-ordination Part 1: Basic requirements Clearances and creepage
30、 distances for all electrical and electronic equipment. 3 Definitions The definitions given in clause 3 of EN 50123-1:1995 and in 3.3 of ENV 50123-7-1 apply. 4 Service conditions Where the equipment described in this standard is mounted on devices or in assemblies covered by the EN 50123 series of s
31、tandards, the service conditions of the devices or assemblies apply. The normal service conditions are given in EN 50123-1:1995, annex B. 5 Characteristics 5.1 Electrical characteristics 5.1.1 General The isolation transducer has an insulation level between its primary and secondary terminals, the s
32、ame as that of the main circuit. An isolation transducer shall have an insulation level in accordance with the following Table 1. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 06:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 50123-7-2:1999 BSI 12-1999 1) Requirement to be speci
33、fied by the purchaser. 2)Refers to insulation mounting, if any. Transducers shall be suitable for providing inputs to measuring devices and/or protection devices. The output impedance, accuracy, linearity of response and phase shift between the input and the output shall be compatible with its desig
34、nated 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 transducers shall be of one of the types described in ENV 50123-7-1, clause 3. It
35、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 up to its continuous thermal current (Ith),which shall be at the maximum ambien
36、t temperature, at two times the specified main or primary circuit thermal current and shall be able to withstand INcwof the main or primary circuit for the time speclfied. Rated accuracy, within specified tolerances, shall apply within the range from 0 to 1,2 Ith, for measuring transducers and in th
37、e range from 0 to 2 Ith, for protection transducers. Performance requirements different from these shall be by agreement between the supplier and the purchaser. NOTEAttention should be paid to EMC emissions and susceptibility in locating the sensor. The preferred secondary signal (specified by the p
38、urchaser in accordance with 5.2.4 of ENV 50123-7-1) may either be a voltage in the range from 0 V to 10 V or a current in the range from 0 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 th
39、e 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 transducer and will be specified by the purchaser. Attention shall be paid to provide adequate protecti
40、on 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 characterize the isolating transducer: a) Rated input voltage(V); b
41、) Rated insulation voltage(V); c) Input signal at 100 % signal(mV); d) Input impedance at 100 % signal(V); e) Output signal at 100 % signal(mA or mV or V); f) Output impedance at 100 % signal(V); g) Accuracy range at 100 % signal(%); h) Accuracy( %); i) Upper limit of response frequency(kHz); j) Pow
42、er frequency withstand (60 s)(kV); k) Impulse withstand voltage(if applicable)(kVcr); l) Power consumption(W); m) Auxiliary voltage(V); n) Loss of auxiliary, power signal1); o) Electronic circuitry self checking1). 5.1.3 d.c. shunt requirements The following requirements characterize the shunt: a) N
43、ormal current rating(A); b) Rated insulation voltage2)(V); c) Output signal at Ith(V); d) Accuracy range based on Ith(%); e) Accuracy( %); f) Rated short-time withstand current INCW(A); g) Upper limit of response frequency(kHz); h) Overload capability; i) Ambient temperature to which rating refers (
44、8C). Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 06:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 50123-7-2:1999 BSI 12-1999 5.1.4 Hall effect sensor requirements The same as for an isolation transducer with the addition of: p) Number of Hall effect devices. 5.2 Mechanical ch
45、aracteristics The enclosure of the transducer may be metal enclosed, or of insulating material. 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
46、 transducer. Transducers intended for location near live conductors shall be provided with an insulated enclosure, unless alternative arrangements are agreed with the purchaser. 6 Information to be exchanged between purchaser and supplier The supplier shall, when practicable, fulfil the requirements
47、 specified in 5.1.2, 5.1.3 and 5.1.4 as far as they are 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 ci
48、rcuits; b) short time withstand current of the primary circuit (INcwin kA); c) overload capability (current and time); d) linearity range and tolerances; e) thermal deviation of the secondary signal expressed per 8C; f) di/dt correctly followed in A/ms; g) residual output (expressed in %) of the las
49、t signal, if any, 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 following: conversion ratio, insulation level, serial number and manufacturers name. 7 Tests 7.1 Dielectric tests The power-frequency voltage withstand test shall be a routine test.
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