1、BRITISH STANDARD BS EN 50123-7-1:2003 Railway applications Fixed installations D.C. switchgear Part 7-1: Measurement, control and protection devices for specific use in d.c. traction systems Application guide The European Standard EN 50123-7-1:2003 has the status of a British Standard ICS 29.130.99;
2、 29.280 BS EN 50123-7-1:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 15 July 2003 BSI 15 July 2003 ISBN 0 580 42252 6 National foreword This British Standard is the official English language version of EN 50123-7-1:2003. It supersedes
3、 DD ENV 50123-7-1:1999 which is withdrawn.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 organizations represented on this subcommittee ca
4、n 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 Correspondence Index”, or by using the “Search”
5、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 itself confer immunity from legal obliga
6、tions. 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 promulgate them in the UK. Summary of
7、 pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 25 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 CommentsEUROPEAN STANDARD EN 50123-
8、7-1 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 Brussels CENELEC -2003 All rights of ex
9、ploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50123-7-1:2003 E ICS 29.130.99;29.280 Supersedes ENV 50123-7-1:1998English version Railway applications Fixed installations D.C. switchgear Part 7-1: Measurement, control and protection devices for specific u
10、se in d.c. traction systems Application guide Applications ferroviaires Installations fixes Appareillage courant continu Partie 7-1: Appareils de mesure, de commande et de protection pour usage spcifique dans les systmes de traction courant continu Guide dapplication Bahnanwendungen Ortsfeste Anlage
11、n Gleichstrom-Schalteinrichtungen Teil 7-1: Mess-, Steuer- und Schutzeinrichtungen in Gleichstrom- Bahnanlagen Anwendungsleitfaden 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 condition
12、s 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
13、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
14、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 50123-7-1:2003 2 Foreword This European Standard was prepared by
15、SC 9XC, Electric supply and earthing systems for public transport equipment and ancillary apparatus (fixed installations), 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 app
16、roved by CENELEC as EN 50123-7-1 on 2002-09-01. This European Standard supersedes ENV 50123-7-1:1998. 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) 2003-09-01 - latest dat
17、e by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-09-01 This Part 7-1 is to be used in conjunction with EN 50123-1:2003. Annexes designated “informative” are given for information only. In this standard, annexes A, B and C are informative. _ 3 EN 50123-7-1:200
18、3 Contents Page 1 Scope 4 2 Normative references 4 3 Definitions 4 4 Measurement. 4 4.1 General 4 4.2 Current. 4 4.3 Voltage dividers 7 5 Control systems. 7 5.1 General 7 5.2 Anti-pumping 7 5.3 Auto-reclose with variable reclose time and final lock out. 7 5.4 Line test device 8 5.5 Undervoltage clos
19、e inhibit 9 6 Protection systems. 10 6.1 General 10 6.2 Protection system for line circuit breakers (L) 10 6.3 Protection system for rectifier circuit breaker (R). 11 6.4 Direct acting (series trip). 12 6.5 Indirect acting 15 Annex A (informative) Electronic protection relay features . 20 A.1 Scope
20、20 A.2 Failures. 20 Annex B (informative) Rate of rise and I relay Examples for fault characteristic and setting parameter selection 22 B.1 Scope 22 B.2 Rate of rise detection 22 B.3 I Protection 23 B.4 Combined di/dt and I protection 24 Annex C (informative) Bibliography on relays in use 25 Figure
21、1 Example of a split form hall effect sensor .6 Figure 2 Basic circuit for line test device.8 Figure 3 Typical impedance device (electromagnetic) - Characteristics and setting .14 Figure 4 Frame fault protection systems 18 Figure B.1 Example of rate of rise and I relay discrimination.23 EN 50123-7-1
22、:2003 4 1 Scope This European Standard provides assistance, guidance and requirements for the design of protection, control and measuring systems in d.c. installations intended to provide a power supply to traction systems. This application guide identifies the characteristics and parameters of equi
23、pment used in the measurement, control and protection of d.c. traction systems. Guidance is given concerning the appropriate application of electrical protection systems. 2 Normative references This European Standard makes reference to other parts of the EN 50123 series. 3 Definitions For the purpos
24、es of this European standard the terms and definitions given in EN 50123-1. apply. 4 Measurement 4.1 General Two types of measurements are made on traction systems: a) measurements of current and voltage for connections to instruments and metering; b) current and voltage signals used for operating p
25、rotection devices. NOTE 1 It is necessary to take care that inductive circuits can alter the inherent di/dt response. NOTE 2 In traction systems with trains supplying regenerative energy and in double end fed line sections, the current measurement device should be capable of measuring forward and re
26、verse currents. 4.2 Current 4.2.1 d.c. shunt A shunt is usually used for measurement purposes, but, when used for protection where accuracy of response is required, the device is preferably of the non-inductive type. Use of an isolating transducer permits operation of secondary devices at lower volt
27、age and with lower rated insulation. This is preferable to taking full mains voltage into what may otherwise be low voltage compartments. It should be noted that shunts can run very hot when carrying their rated normal current, with one terminal hotter than the other, dependant on the direction of c
28、urrent flow. Where they are used inside switchgear assemblies, then temperature rise tests of the assemblies should take this fact into account. 5 EN 50123-7-1:2003 4.2.2 Isolating transducer See EN 50123-7-2 and EN 50123-7-3. This device requires an auxiliary power supply which should be derived fr
29、om a guaranteed source whose loss of supply should initiate an alarm. The output signal is usually not of the same level as the input and is dependant on the requirements of the secondary device. 4.2.3 Hall effect sensor This device requires an auxiliary power supply which should be derived from a g
30、uaranteed source whose loss of supply should initiate an alarm. This device provides an isolated output. The primary insulation is generally provided by encapsulation of the iron circuit and sensors. The device is sometimes constructed in a split form for ease of fitting to a main conductor. See Fig
31、ure 1 for typical example of a split form of Hall effect sensor. The output signal from the device is proportional to the current in the main conductor. This signal is very low in magnitude and usually requires amplification to provide a suitable input to the secondary device. Thus an auxiliary powe
32、r supply is required. Reliability and overall accuracy can be improved by using an average value obtained from multiple devices. Placing devices at different locations around a conductor can reduce proximity effects. EN 50123-7-1:2003 6 Figure 1 Example of a split form hall effect sensor 7 EN 50123-
33、7-1:2003 4.3 Voltage dividers Dividers have the same insulation voltage requirements as the main circuit. Isolating transducers should be employed if the secondary device can not withstand the main circuit insulation level. NOTE Failure to open circuit of the footing resistor will result in approxim
34、ately full mains voltage appearing on the output side of the divider. A voltage limiter connected in parallel to the footing resistor may be employed for protection against overvoltages 5 Control systems 5.1 General Control systems are usually only those which involve the electrical closing of switc
35、hgear devices. Their effect is to permit or inhibit a closure depending on the status of the system and the compliance with specified requirements. 5.2 Anti-pumping This system permits the closing device to effect a single attempt while the signal to close is maintained. If the device fails to compl
36、ete a satisfactory close operation whilst the close signal is maintained, then attempts at further reclosing (pumping) are inhibited. Anti-pumping can be achieved in the closing control circuit in various ways, either by using mechanism auxiliary switches or a timing relay. It only allows a single c
37、losing pulse to the closing device, which resets when the initial closing signal is released. Anti-pumping should be explicitly requested by the purchaser and may be applied to all types of switchgear closing device. 5.3 Auto-reclose with variable reclose time and final lock out Auto-reclose is only
38、 applied to the line circuit breaker L. Its purpose is to reclose the line circuit breaker automatically after an overcurrent release operation. On traction systems especially light-rail or trolleybus systems, overcurrent release operations of line circuit breakers are often due to overcurrents at s
39、imultaneous accelerations of vehicles or due to temporary short circuits. An auto-reclose system can enhance the reliability of the system. Auto-reclose is usually associated with a timing device which initiates several attempts at reclosing with varying adjustable intervals of circuit dead time. Af
40、ter a prescribed number of unsuccessful recloses, then a lock out of the reclosing circuit is instigated. This lock out is either electrically or manually resettable. EN 50123-7-1:2003 8 The purchaser should specify the need for an auto-reclose device and provide the following information: a) number
41、 of recloses: e.g. 2 recloses then lock out; b) time interval between each attempt: e.g. 15 s, followed by 60 s, followed by 180 s; c) lock out reset: i.e. local or remote. 5.4 Line test device This system is used on line circuit breakers L before closing, to prevent the line circuit breaker closing
42、 onto an overload or a short circuit condition. A typical basic line test device circuit is shown in Figure 2. Figure 2 Basic circuit for line test device This is achieved by inserting a resistor by means of a suitably rated contactor between the switchboard busbars and the contact line. An auxiliar
43、y supply is alternatively used as the test voltage. The load impedance acts as a footing resistance to the inserted resistor and, by measuring the voltage between feeder and return circuit, it can allow/inhibit a close signal. 9 EN 50123-7-1:2003 When the measured voltage is below a prescribed level
44、, then there is an overload on the line and the close is inhibited. When this voltage is above a prescribed level, a close is permitted. Line test device systems may be either of the low resistance or the high resistance type. The problem with line testing measurements is the effect of the negative
45、voltage drop which can appear on the return circuit, due to currents in the return circuit from loads external to the line test device zone, which can give misleading interpretation of the line testing measurements. Where negative voltage drop in the return circuit can give this effect, it can be mi
46、nimised by resorting to the low resistance system which tends to swamp out this effect. The line test device can be coupled with auto-reclose schemes, thereby inhibiting a reclose if the original trip was due to a fault which had not cleared itself in the dead time. The line test device can be by-pa
47、ssed if the line is already live from the line circuit breaker at the remote end. The purchaser should specify the need for a Line test device system and provide the following information: a) high or low value of the resistor: i.e. involving a current value to be chosen from 1 A to 400 A; b) whether
48、 line test device is combined with auto-reclose. 5.5 Undervoltage close inhibit Operation of undervoltage close inhibit is usually achieved by the fitting of an undervoltage release to the circuit breaker. Alternatively undervoltage relays with accurate pick up and drop off voltage levels, operating
49、 on to shunt trip devices and close inhibits, can achieve similar effects. When fitted to a rectifier circuit breaker, this device has the effect that the circuit breaker cannot be closed unless the rectifier is live. The voltage source is the output of the rectifier. When fitted to a line circuit breaker, the voltage source is that of the busbar. Unless the busbar is live the circuit breaker cannot be closed. The p
