1、BRITISH STANDARD BS EN 50123-2:2003 Railway applications Fixed installations D.C. switchgear Part 2: D.C. circuit breakers The European Standard EN 50123-2:2003 has the status of a British Standard ICS 29.120.60; 45.020 BS EN 50123-2:2003 This British Standard, was published under the authority of t
2、he Standards Policy and Strategy Committee on 11 July 2003 BSI 11 July 2003 ISBN 0 580 42247 X National foreword This British Standard is the official English language version of EN 50123-2:2003. It supersedes BS EN 50123-2:1996 which is withdrawn. The UK participation in its preparation was entrust
3、ed 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 can be obtained on request to its secretary. Cross-references The British Standards which implem
4、ent 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” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does
5、 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 obligations. aid enquirers to understand the text; present to the responsible international/European
6、 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 pages This document comprises a front cover, an inside front cover, the EN title page, pages
7、2 to 27 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 50123-2 NORME EUROPENNE EUROPISCHE NORM February 2003 CENELEC European Committee for Electrotechnica
8、l Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 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 501
9、23-2:2003 E ICS 29.120.60; 45.020 Supersedes EN 50123-2:1995 + A1:1996English version Railway applications Fixed installations D.C. switchgear Part 2: D.C. circuit breakers Applications ferroviaires Installations fixes Appareillages courant continu Partie 2: Disjoncteurs pour courant continu Bahnanw
10、endungen Ortsfeste Anlagen Gleichstrom-Schalteinrichtungen Teil 2: Gleichstrom-Leistungsschalter 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 Standar
11、d 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 official versions (English, French
12、, 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 committees of Austria, Belgium, Cz
13、ech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 50123-2:2003 - 2 - Foreword This European Standard was prepared by SC 9XC, Electric supply and eart
14、hing 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 approved by CENELEC as EN 50123-2 o
15、n 2002-09-01. This European Standard supersedes EN 50123-2:1995 + A1:1996. It has been prepared taking into account IEC 61992-2 in order to align technically as much as possible this EN 50123-2 and IEC 61992-2. These documents are to be considered as technically equivalent except for those reference
16、s and peculiarities which are due to the European standardization in the railway application field. 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 date
17、by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-09-01 This Part 2 is to be used in conjunction with EN 50123-1:2003. Annexes designated “informative” are given for information only. In this standard, annex A is informative. _ - 3 - EN 50123-2:2003 Contents Pag
18、e 1 Scope . 4 2 Normative references 4 3 Definitions 4 4 Service requirements. 4 5 Characteristics of the circuit breaker 4 5.1 Enumeration of the characteristics 4 5.2 Type of circuit breaker 5 5.3 Rated values and limit values for the main circuit 7 5.4 Control circuits 10 5.5 Auxiliary contacts a
19、nd circuits 11 5.6 Releases . 11 5.7 Arc voltage 12 6 Construction 12 6.1 General. 12 6.2 Circuit breaker enclosures . 13 6.3 Temperature-rises 14 6.4 Dielectric strength 14 6.5 Electrical and mechanical endurance 14 6.6 Operation . 15 6.7 Corrosion protection 15 6.8 Noise emission. 16 6.9 Cooling 1
20、6 6.10 Servo-control (where applicable) 16 6.11 Other facilities . 16 7 Information and marking. 16 7.1 Information 16 7.2 Marking . 17 8 Tests . 17 8.1 General. 17 8.2 Applicable tests and test sequence. 18 8.3 Performance of tests 18 Annex A (informative) Information required. 25 A.1 General 25 A.
21、2 Procurement specification . 25 A.3 Manufacturers specification 25 Table 1 Shortened type-designation. 6 Table 2 Circuit breaker duties 9 Table 3 Test duty cycles. 10 Table 4 List of applicable tests and sequence 18 Table 5 Verification of the behaviour of the circuit breaker when performing test d
22、uties f, ff and fr . 23 EN 50123-2:2003 - 4 - 1 Scope This part of EN 50123 specifies requirements for d.c. circuit breakers for use in fixed installations of traction systems. NOTE Switchgear assemblies, electromagnetic compatibility (EMC) and dependability are not covered in this part of EN 50123,
23、 but by other parts of this standard or by other standards, as indicated in EN 50123-1. 2 Normative references This European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text and the pu
24、blications 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 publication referred to applies (including
25、 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 Environmental conditions applicable to the equipment discussed in this standard are covered in 4.1 of EN 50123-1. 5 Characteristics
26、 of the circuit breaker 5.1 Enumeration of the characteristics The characteristics of a circuit breaker and its assigned designations and values (where applicable) are covered below as follows: type of circuit breaker (5.2); rated values and limit values of the main circuit and short-circuit charact
27、eristics (5.3); control circuits (5.4); auxiliary circuits (5.5); releases (5.6); arc voltages (5.7). - 5 - EN 50123-2:2003 5.2 Type of circuit breaker A circuit breaker is defined by the following details, as applicable. NOTE 1 As far as applicable, the following requirements also apply to single-p
28、ole circuit breakers electrically or mechanically interlocked in multiple systems. a) Interruption: in air; via a semiconductor. NOTE 2 In this standard only interruption in air or via a semiconductor is addressed. This standard may be used for other specified interrupting media, as far as applicabl
29、e, where clearly specified by mutual agreement between purchaser and supplier. b) Breaking characteristics (class designation): high speed current limiting circuit breakers H; very-high speed current limiting circuit breakers V; semi-high speed circuit breakers S. c) Use (installation point) in the
30、system: interconnector circuit breaker I (also called bus-section or section circuit breaker); line circuit breaker L; rectifier circuit breaker R. d) Current interruption direction: unidirectional U: - fitted with a series unidirectional release U 1 ; - fitted with a series bidirectional release U
31、2 . NOTE 3 U 2circuit breakers are used for application where the reverse fault current is low (distant fault current) and cannot operate the overload protection for normal discrimination purposes (i.e. substations where adjacent substations are a far distance away). bidirectional B. e) Duty of the
32、main circuit NOTE 4 To be specified when different from 5.3.4.2 and Table 2. f) Actuating of the closing and opening operations: stored energy operation; independent manual operation; independent power operation; use of magnet; type of automatic tripping due to a release or relay; interlocks for ope
33、ning and/or closing operations; trip-free provision; anti-pumping device. EN 50123-2:2003 - 6 - g) Relay or release type: type of the relay(s) or release(s) involved. h) Provision of an enclosure: without provision of an enclosure O (see 3.3.16 of EN 50123-1); with provision of an integral enclosure
34、 E (see 3.3.17 of EN 50123-1); with provision of a separate protection enclosure P. The purchaser shall indicate which characteristics are to be present in the required circuit breaker(s) and only those tests which relate to the chosen type are applicable to the selected type of circuit breaker. The
35、 above designations are used in this standard and may be used elsewhere adopting the conventional grouping as given in Table 1: Table 1 - Shortened type-designation Items above b c d ah aOptions H V S /I /L /R /U 1/U 2/B /O /E /P Examples H/L/B/E V/I/P S/R/O H /R and L/U 2bNOTE When a circuit breake
36、r is not suitable to perform all duties as given in 5.3.4.2, this fact will be indicated by means of the lower case letter(s) designating actual capability according to Table 2, first column (for example, H/Iff, fr/ P). aOptional designations. bWhen a circuit breaker is or shall be suitable for mult
37、iple alternate functions, the indication of these functions shall be preceded by an and. Where semiconductor circuit breakers are only designed for use in rectifier equipped substations, they shall be clearly so marked. If they may also be used as track paralleling circuit breakers, when the substat
38、ion rectifier circuit breakers are out of service, they shall also be clearly so marked. - 7 - EN 50123-2:2003 5.3 Rated values and limit values for the main circuit 5.3.1 General The rated characteristic values shall be specified by the purchaser. Nominal voltage values are to be selected from the
39、values indicated in Table 1 of EN 50123-1; current values and track time constant (based on the track configuration which gives the largest track time constant) should have one of the preferred values listed in 5.1.2 of EN 50123-1. These values should be confirmed by the supplier, who should indicat
40、e the rated values for the type of circuit breaker proposed and supply any other relevant data. All these values are to be stipulated in accordance with 5.3.2 to 5.3.4. Definitions are given in EN 50123-1. Some data may be omitted by agreement. 5.3.2 Voltages A circuit breaker is identified by the f
41、ollowing voltages: system voltages and limits (see 3.2.1 and 5.1.3 of EN 50123-1); nominal voltage U n(see EN 50163); rated voltage U Ne(see 3.2.3 of EN 50123-1); rated insulation voltage U Nm(see 3.2.2 of EN 50123-1). It shall be equal to or higher than U max ; rated impulse withstand voltage U Ni(
42、see 3.2.4 of EN 50123-1); power-frequency voltage withstand level (dry) U a(see 3.2.5 and Table 1 of EN 50123-1); maximum arc voltage (see 3.2.6.1 of EN 50123-1); rated auxiliary and control supply voltages (see 3.2.3.1 of EN 50123-1). 5.3.3 Currents A circuit breaker is defined by the following cur
43、rents: conventional thermal current I th , I the(see 3.2.8 and 3.2.9 of EN 50123-1); rated service current I Ne(see 3.2.10 of EN 50123-1); rated short circuit current I Nss(see 3.2.12.1 of EN 50123-1); rated short-time withstand current I Ncw (see 3.2.11 of EN 50123-1). NOTE 1 Short-time ratings onl
44、y apply to circuit breakers not fitted with series trip devices, or in a unidirectional device where a series trip is inoperative. In practice this would apply to a rectifier circuit breaker in the forward direction where a series trip only acts in the reverse direction. NOTE 2 Rated short-time curr
45、ents donot need to have the same value as the rated short-circuit current I Nss . overload capability: the purchaser shall inform the supplier of the load cycle requirements (see 3.2.10, note 2 of EN 50123-1). EN 50123-2:2003 - 8 - 5.3.4 Short-circuit characteristics 5.3.4.1 Rated short-circuit brea
46、king and making capacities These values are defined in 3.2.19 and 3.2.23 of EN 50123-1 and are associated with the rated voltage U Ne , the rated service current I Ne , the rated short-circuit current I Nss , the rated track time-constant T Ncand the class designation H or V or S. The rated short-ci
47、rcuit making capacity is the prospective peak value of the rated short-circuit current I Nss(see 3.2.12.1 of EN 50123-1). A rated short-circuit breaking capacity requires the circuit breaker to be able to interrupt any short-circuit current of a value lower than or equal to this rated breaking capac
48、ity at the circuit time constant stipulated. A circuit breaker having a breaking capacity at a rated track time constant T Ncis capable of the same breaking capacity at all lower values of track time constant T c . The prospective maximum short-circuit current is the sum of the prospective short-cir
49、cuit currents from all sources connected to the system, including rectifier converters and regenerative trains. When fixing the maximum short-circuit current and the above track time constant, clause 5 of EN 50123-1 shall be considered. 5.3.4.2 Duties and test duty cycles The duties required of a circuit breaker for each of the three uses are listed in Table 2. The test duty cyc
