1、BSI Standards PublicationBS EN 50578:2013Railways applications Directcurrent signalling relaysBS EN 50578:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50578:2013.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/9/1, Railway
2、 Electrotechnical Applications -Signalling and communications.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The
3、 British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 75609 2ICS 93.100Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June
4、2013.Amendments issued since publicationDate Text affectedBS EN 50578:2013EUROPEAN STANDARD EN 50578 NORME EUROPENNE EUROPISCHE NORM June 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Norm
5、ung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50578:2013 E ICS 93.100 English version Railways applications - Direct current signalling relays Applications ferrovia
6、ires - Relais de signalisation courant continu Bahnanwendungen - Gleichstrom-Signalrelais This European Standard was approved by CENELEC on 2013-05-20. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
7、tatus 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 CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, Fre
8、nch, 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria
9、, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
10、Sweden, Switzerland, Turkey and the United Kingdom. BS EN 50578:2013EN 50578:2013 - 2 - Contents Foreword 3 Introduction 4 1 Scope 5 2 Normative references . . 5 3 Terms and definitions. . 5 4 Classification 7 5 Essential requirements of the relays and their construction . . 8 5.1 Generic requiremen
11、ts for signalling relays . . 8 5.1.1 Forcibly guided (mechanically linked) contacts . 8 5.1.2 Forcibly guided (mechanically linked) operation . 8 5.2 Specific requirements . . 8 5.2.1 Relays of type N . . 8 5.2.2 Relays of type C . . 8 5.3 Mechanical construction of the signalling relays . . 9 5.3.1
12、 Connecting devices . 9 5.3.2 Materials . 9 5.4 Environmental conditions . 9 5.4.1 General . 9 5.4.2 Vibrations and shocks . 9 5.5 Magnetic system . . 9 5.5.1 General . 9 5.5.2 Requirements for new relays . . 9 5.5.3 Functioning during service . . 10 5.6 Design of insulation . 10 5.6.1 General . 10
13、5.6.2 Overvoltage . 10 5.6.3 Test voltage . . 11 5.6.4 Case of a supply circuit not connected to earth . . 11 5.6.5 Pollution . . 11 5.7 Contacts . 11 5.7.1 Spacing . 11 5.7.2 Break contact . . 11 5.7.3 Contact heating . 11 5.7.4 Service life . . 11 5.7.5 Minimum distance apart of the relay contact
14、elements. 12 5.7.6 Contact force . . 12 5.7.7 Self-cleaning . 12 5.7.8 Bounce . . 12 Bibliography . 13 BS EN 50578:2013- 3 - EN 50578:2013 Foreword This document (EN 50578:2013) has been prepared by SC 9XA, “Communication, signalling andprocessing systems“, of Technical Committee CENELEC TC 9X, “Ele
15、ctrical and electronic applicationsfor railways“. The following dates are fixed: latest date by which this document has to be implemented at national level bypublication of an identical national standard or by endorsement (dop) 2014-05-20 latest date by which the national standards conflicting with
16、this document have to be withdrawn (dow) 2016-05-20 This document is a transposition of the UIC leaflet 736, Signalling relays. Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. CENELEC and/or CEN shall not be held responsible for id
17、entifying any or all suchpatent rights. BS EN 50578:2013EN 50578:2013 - 4 - Introduction This European Standard gives a set of generic and specific requirements for direct current signallingrelays. This European Standard introduces a set of recommendations and requirements for signalling relaycharac
18、teristics, construction, magnetic system, contacts and insulation. Requirements are coordinatedwith present international standards on all-or-nothing relays. BS EN 50578:2013- 5 - EN 50578:2013 1 Scope This European Standard gives requirements for direct current relays intended for safety-relatedapp
19、lications in railway signalling installations. This European Standard is applicable to monostable relays. However it can also be used as a guide forother relays such as with bistable relays. 2 Normative references The following documents, in whole or in part, are normatively referenced in this docum
20、ent and areindispensable for its application. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any amendments) applies. EN 50124-1, Railway applications Insulation coordination Part 1: Basic requirements Clearances
21、and creepage distances for all electrical and electronic equipment EN 50125-3:2003, Railway applications Environmental conditions for equipment Part 3:Equipment for signalling and telecommunications EN 60664-1, Insulation coordination for equipment within low-voltage systems Part 1: Principles,requi
22、rements and tests (IEC 60664-1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 all-or-nothing relay electrical relay, which is intended to be energised by a quantity, the value of which is either within itsoperative range or effectively zero
23、 Note 1 to entry: “All-or-nothing relays“ include both “elementary relays“ and “time relays“. SOURCE: IEC 60050-444:2002, 444-01-02 3.2 armature moveable part of a relay that controls contact members 3.3 bistable relay electrical relay which, having responded to an energising quantity and having cha
24、nged its condition,remains in that condition after the quantity has been removed; a further appropriate energisation isrequired to make it change its condition SOURCE: IEC 60050-444:2002, 444-01-08 3.4 bounce time for a contact which is closing/opening its circuit, time interval between the instant
25、when the contactcircuit first closes/opens and the instant when the circuit is finally closed/opened SOURCE: IEC 60050-444:2002, 444-05-04 BS EN 50578:2013EN 50578:2013 - 6 - 3.5 break contact (for elementary relays) contact which is open when the relay is in its operate condition and which is close
26、d when the relay is inits release condition SOURCE: IEC 60050-444:2002, 444-04-18 3.6 change-over contact combination of two contact circuits with three contact members, one of which is common to the twocontact circuits; such that when one of these contact circuits is open, the other is closed SOURC
27、E: IEC 60050-444:2002, 444-04-19 3.7 contact gap gap between the contact points when the contact circuit is open SOURCE: IEC 60050-444:2002, 444-04-09 3.8 contact member (for elementary relays) conductive part designed to co-act with another to close or open the output circuit SOURCE: IEC 60050-444:
28、2002, 444-04-05 3.9 contact force force which two contact members exert against each other at their contact points in the closed position SOURCE: IEC 60050-444:2002, 444-04-10 3.10 contact point part of a contact member at which the contact circuit closes or opens SOURCE: IEC 60050-444:2002, 444-04-
29、06 3.11 contact wipe relative rubbing movement of contact points after they have touched SOURCE: IEC 60050-444:2002, 444-04-12 3.12 drop-away current maximum current through the coil that, starting from the nominal current value, produces the openingof all the make contacts 3.13 electromechanical re
30、lay electrical relay in which the intented response results mainly from the movement of mechanicalelements SOURCE: IEC 60050-444:2002, 444-01-04 3.14 elementary relay all-or-nothing relay which operates and releases without any intentional time delay SOURCE: IEC 60050-444:2002, 444-01-03 3.15 make c
31、ontact (for elementary relays) contact which is closed when the relay is in its operate condition and which is opened when the relay isin its release condition SOURCE: IEC 60050-444:2002, 444-04-17 BS EN 50578:2013- 7 - EN 50578:2013 3.16 monostable relay electrical relay which, having responded to
32、an energising quantity and having changed its condition,returns to its previous condition when that quantity is removed SOURCE: IEC 60050-444:2002, 444-01-07 3.17 nominal current current passing through the coil of the relay when the coil is supplied with nominal voltage 3.18 operate condition (for
33、elementary relays) for a monostable relay, specified condition of the relay when it is energised by the specified energisingquantity and has responded to that quantity; for a bistable relay, the condition other than the releasecondition as declared by the manufacturer SOURCE: IEC 60050-444:2002, 444
34、-02-02 3.19 pick-up current (compression) minimum current through the coil that, starting from a null value, is necessary to move the armaturefrom the release position to the operate position and apply the specified contact force, closing all themake contacts 3.20 pick-up current (service value) min
35、imum current through the coil that, starting from a null value, is able to move the armature closingall the make contacts 3.21 relay with forcibly guided (mechanically linked) contacts elementary relay with at least one make contact and at least one break contact and includingmechanical measures to
36、prevent any make contact(s) and any break contact(s) being in the closedposition simultaneously SOURCE: EN 50205:2002, 3.3 3.22 release condition (for elementary relays) for a monostable relay, specified condition of the relay when it is not energised; for a bistable relay, oneof the conditions, as
37、declared by the manufacturer SOURCE: IEC 60050-444:2002, 444-02-01 4 Classification The requirements of the various categories of signalling relays required to guarantee installation withthe degree of reliability and safety desirable for operating purposes, depend on the functions to befulfilled by
38、the relays and the type of circuit with which they are to be used. Bearing in mind these characteristics, a distinction may be made between the following types ofsignalling relays: null Type N (non-proved relays) Relays themselves fulfilling all the safety conditions without the aid of other relays
39、or withoutcontrol of operations in the circuit. null Type C (proved relays) Relays for which the safety conditions are guaranteed by control of operations in the circuit. BS EN 50578:2013EN 50578:2013 - 8 - 5 Essential requirements of the relays and their construction 5.1 Generic requirements for si
40、gnalling relays 5.1.1 Forcibly guided (mechanically linked) contacts Signalling relays shall be equipped with forcibly guided (mechanically linked) contacts. The forciblyguided (mechanically linked) contacts shall be designed in such a way that it is ensured by mechanicalmeans that make and break co
41、ntacts can never be in the closed position simultaneously. If one of the make contacts is closed, none of the break contacts is closed. If one of the break contactsremains closed, none of the make contacts closes (assuming that nominal power conditions apply see also 5.6.2). Operation of forcibly gu
42、ided (linked) contacts means that if, for example, any givenmake contact fails to open and the relay is de-energised, none of the break contacts closes. The sameprinciple applies to the failure-to-open of a break contact with energisation of the relay, i.e. in this case,no make contact shall close (
43、EN 50205). 5.1.2 Forcibly guided (mechanically linked) operation The efficiency of forcibly guided (mechanically linked) contact operation shall be maintained as long asthe relay operates, even when beyond the specified endurance. This applies both to loaded andunloaded contacts. Forcibly guided (me
44、chanically linked) operation shall be maintained even ifindividual parts of the relay fail. Under such circumstances, it is irrelevant whether this failure is due towear or breakage. Use of change-over contacts is permitted for signalling relays in safety-relevant circuits. 5.2 Specific requirements
45、 5.2.1 Relays of type N 5.2.1.1 These shall be characterised by their non-weldable make contact points, through the use of asuitable contact point material (for example, silver-carbon for which there is no risk of welding above acertain percentage of carbon), or by the introduction of special constr
46、uctional conditions preventingrisks of welding of the contact points (for example, fusing, contacts in series). 5.2.1.2 The relays shall open the make contacts by falling of the armature under its own weight, whenthe current is interrupted in the coil. 5.2.1.3 The relays may also be equipped with re
47、turn springs. These return springs shall only be usedto increase the contact force of break contacts and ensure that the required time parameters for thearmature to fall are met. They shall not be used for the opening of the make contacts. 5.2.2 Relays of type C This type of relay shall be that the
48、falling of the armature of the relay is proved during operation; for thisreason, no special qualities of non-weldability are required for the material that contact points are madeof. BS EN 50578:2013- 9 - EN 50578:2013 5.3 Mechanical construction of the signalling relays 5.3.1 Connecting devices The
49、 connecting devices for relays of the plug-in type (or groups of connectable relays) shall beconstructed so that it is not possible for any errors in assembly or connection to occur (e.g. protectionagainst coding errors). 5.3.2 Materials Sufficient space shall be left between the moving parts of the relays and the detachable case or coverof the relay (or group of relays), to avoid interfering with its operation. The material, the shape, arrangement and control of the contacts shall be chosen to guarantee normaland safe operation
