1、BSI Standards PublicationBS EN 50526-2:2014Railway applications Fixedinstallations D.C. surgearresters and voltage limitingdevices -Part 2: Voltage limiting devicesBS EN 50526-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50526-2:2014.The UK participati
2、on in its preparation was entrusted to TechnicalCommittee GEL/9/3, Railway Electrotechnical Applications - FixedEquipment.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 con
3、tract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 73005 4ICS 29.120.50; 29.280Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under
4、the authority of theStandards Policy and Strategy Committee on 31 March 2014.Amendments issued since publicationDate Text affectedBS EN 50526-2:2014EUROPEAN STANDARD EN 50526-2 NORME EUROPENNE EUROPISCHE NORM February 2014 CENELEC European Committee for Electrotechnical Standardization Comit Europen
5、 de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50526-2:2014 E ICS 29.120.
6、50; 29.280 English version Railway applications - Fixed installations - D.C. surge arresters and voltage limiting devices - Part 2: Voltage limiting devices Applications ferroviaires - Installations fixes - Parafoudres et limiteurs de tension pour systmes courant continu - Partie 2: Limiteurs de ten
7、sion Bahnanwendungen - Ortsfeste Anlagen - berspannungsableiter und Spannungsbegrenzungseinrichtungen - Teil 2: Spannungsbegrenzungseinrichtungen This European Standard was approved by CENELEC on 2013-12-30. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
8、e the conditions 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 CEN-CENELEC Management Centre or to any CENELEC member. This European
9、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 own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members
10、 are the national electrotechnical committees of Austria, 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
11、, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 50526-2:2014EN 50526-2:2014 - 2 - Contents Page Foreword . 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 6 4 Classes of VLD . 8 5 Characteristics and requirements of the
12、 VLDs 9 5.1 Marking . 9 5.2 Service requirements 9 5.2.1 Normal outdoor service conditions . 9 5.2.2 Normal indoor service conditions . 9 5.2.3 Abnormal service conditions . 10 5.3 General characteristics . 10 5.4 Minimum requirements . 10 5.4.1 Response time . 10 5.4.2 Additional requirements for V
13、LDs of class 1 10 5.4.3 Additional requirements for VLDs of classes 3 and 4 . 10 5.5 Electrical characteristics and thermal rating 11 5.6 Protection of VLDs against lightning 11 5.7 Command and control (class 3 and 4 only) 12 5.7.1 Local control 12 5.7.2 Remote signalling 12 5.7.3 Operation and alar
14、m recordings 12 6 Type tests . 13 6.1 General . 13 6.2 Nominal triggering voltage UTnand non-triggering voltage UW14 6.2.1 Procedure for welding shutspark gap VLDs (Class 1) . 14 6.2.2 Procedure for thyristor type VLDs (Class2) 14 6.2.3 Procedure for mechanical switching VLDs and for combined thyris
15、tors with mechanical switching devices VLDs (Class 3 and Class 4) 15 6.3 Leakage current . 15 6.4 D.C. current withstand 15 6.4.1 General . 15 6.4.2 Procedure to determine the rated current. 15 6.4.3 Procedure to determine short time withstand current 16 6.5 A.C. current withstand characteristics (o
16、ptional) 17 6.6 Response time characteristics . 18 6.6.1 Response time for d.c. voltage 18 6.6.2 Response time for combined a.c.-d.c. voltage . 20 BS EN 50526-2:2014- 3 - EN 50526-2:2014 6.7 Lightning current withstand characteristics for VLDs exposed to direct lightning strikes 21 6.8 Recovery test
17、 (Class 3, 4) . 23 6.9 Reverse voltage test (Class 2.1) . 23 6.10 Dielectric tests for panel type voltage limiting devices (Class 3 and 4) 24 6.10.1 Test conditions 24 6.10.2 Power-frequency voltage withstand test. 24 6.11 Degree of protection 24 6.12 Environmental tests for outdoor equipment 25 6.1
18、3 Determination of minimum current for safe short circuiting of Class 1 VLDs 25 7 Routine tests 26 7.1 General . 26 7.2 VLDs of classes 3 and 4 26 7.3 Dielectric tests for panel type voltage limiting devices. 26 Annex A (informative) Preferred ranges of the principal properties of the VLDs 27 Biblio
19、graphy 31 Figures Figure 1 Test circuit for testing of response time 19 Figure 2 TR evaluation. 19 Figure 3 Response time characteristic 20 Figure 4 Test circuit for testing of response time TRfor combined a.c.-d.c. voltage 21 Figure 5 Evaluation of response time TRfor combined a.c.-d.c voltage 21 F
20、igure 6 Circuit for the Recovery Voltage test 23 Tables Table 1 Classes of voltage-limiting device . 8 Table 2 Type tests . 13 Table 3 Maximum response time as a function of d.c. voltages 18 Table 4 Maximum response time for combined a.c.-d.c. voltages 20 Table A.1 Nominal Triggering voltage UTn27 T
21、able A.2 Instantaneous Triggering Voltage UTI27 Table A.3 Rated current Ir. 28 Table A.4 Short time withstand current IW28 Table A.5 Leakage current IL28 Table A.6 Making and breaking capacity 28 Table A.7 Nominal lightning current (8/20 s) Iimp-n. 29 Table A.8 High current impulse 8/20 s and 4/10 s
22、 Iimp-high. 29 Table A.9 High charge impulse Iimp-hc29 Table A.10 Current-time characteristic for safe short circuiting of Class 1 VLDs . 30 BS EN 50526-2:2014EN 50526-2:2014 - 4 - Foreword This document (EN 50526-2:2014) has been prepared by CLC/SC 9XC “Electric supply and earthing systems for publ
23、ic transport equipment and ancillary apparatus (Fixed installations)“. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-12-30 latest date by which the national stand
24、ards conflicting with this document have to be withdrawn (dow) 2016-12-30 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This Europea
25、n Standard, Railway applications Fixed installations D.C. surge arresters and voltage limiting devices, is in three parts: Part 1: Surge arresters deals with metal oxide arresters without gaps for d.c. railway traction systems (fixed installations) and is based on EN 60099-4, Ed. 2.2, 2009-5; Part 2
26、: Voltage limiting devices the present text deals with voltage limiting devices for specific use in d.c. railway traction systems (fixed installations); Part 3 Application guide currently at Enquiry stage deals with a guide of application of metal-oxide arresters and of voltage limiting devices. BS
27、EN 50526-2:2014- 5 - EN 50526-2:2014 1 Scope This European Standard applies to Voltage Limiting Devices (VLDs) to be applied in d.c. traction systems in order to comply with protective provisions against electric shock from d.c., and mixed a.c. d.c. voltages, in accordance with the EN 50122 series,
28、taking into account stray current provisions. VLDs operate in such a way as to connect the track return circuit of d.c. railway systems to the earthing system or to conductive parts within the overhead contact line zone or current collector zone. 2 Normative references The following documents, in wh
29、ole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50122-1:2011, Railway applications
30、 Fixed installations Electrical safety, earthing and the return circuit Part 1: Protective provisions against electric shock EN 50122-3:2010, Railway applications Fixed installations Electrical safety, earthing and the return circuit Part 3: Mutual Interaction of a.c. and d.c. traction systems EN 50
31、123-1:2003, Railway applications Fixed installations D.C. switchgear Part 1: General EN 50123-7 (all parts), Railway applications Fixed installations D.C. switchgear Part 7-x: Measurement, control and protection devices for specific use in d.c. traction systems EN 50124-1, Railway applications Insul
32、ation coordination Part 1: Basic requirements Clearances and creepage distances for all electrical and electronic equipment EN 50125-2, Railway applications Environmental conditions for equipment Part 2: Fixed electrical installations EN 50163:2004, Railway applications Supply voltages of traction s
33、ystems EN 50526-1:2012, Railway applications Fixed installations D.C. surge arresters and voltage limiting devices Part 1: Surge arresters EN 60060-1, High-voltage test techniques Part 1: General definitions and test requirements (IEC 60060-1) EN 60085, Electrical insulation Thermal evaluation and d
34、esignation (IEC 60085) EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989) EN 61643-311, Components for low-voltage surge protective devices Part 311: Performance requirements and test circuits for gas discharge tubes (GDT) (IEC 61643-311) EN ISO 4287, Geometrical
35、product specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters (ISO 4287) EN ISO 4892-1, Plastics Methods of exposure to laboratory light sources Part 1: General guidance (ISO 4892-1) EN ISO 4892-2, Plastics Methods of exposure to laboratory light sour
36、ces Part 2: Xenon-arc lamps (ISO 4892-2) EN ISO 4892-3, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps (ISO 4892-3) BS EN 50526-2:2014EN 50526-2:2014 - 6 - 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 50526-1:
37、2012 and the following apply. 3.1 voltage-limiting device VLD protective device whose function is to prevent existence of an impermissible high touch voltage SOURCE: EN 50122-1:2011, 3.1.20 3.2 recoverable VLD VLD that recovers after triggering 3.3 non-recoverable VLD VLD remaining in its low resist
38、ance state permanently after triggering 3.4 welding shut spark gap voltage fuse VLD which triggers by electrical discharge across a gap causing a permanent short-circuit by welding shut of metallic parts 3.5 rated current Ir maximum value of the direct current that may flow for the specified long te
39、rm through the VLD in specified environmental conditions without exceeding the temperature rise limits 3.6 short time withstand current IWcurrent that a VLD can carry in closed status, during a specified short time under prescribed conditions of use and behavior 3.7 making capacity INSSvalue of pros
40、pective making current that a switching device is capable of making at a stated voltage under prescribed conditions of use and behavior Note 1 to entry: The conditions to be prescribed are dealt with in the relevant specifications. SOURCE: IEV 441-17-09, modified The beginning of the Note has been c
41、hanged. 3.8 breaking capacity maximum current that a recoverable VLD can interrupt at a stated voltage 3.9 leakage current ILcurrent which flows through the terminals when the VLD is in open status BS EN 50526-2:2014- 7 - EN 50526-2:2014 3.10 lightning current impulse Iimp-n8/20 s current impulse wi
42、th limits on the adjustment of equipment such that the measured values are from 7 s to 9 s for the virtual front time and from 18 s to 22 s for the time to half value on the tail SOURCE: EN 60099-4:2004 3.11 high current impulse Iimp-highpeak value of discharge current having a 4/10 s or 8/20 s impu
43、lse shape which is used to test the ability of the VLD to withstand direct lightning strikes from the dielectric point of view 3.12 high charge impulse Iimp-hcpeak value of high charge impulse having a 10/350 s shape, or a waveshape with the same charge drained and similar duration, which is used to
44、 test the ability of the VLD to withstand direct lightning strikes from the energy capability point of view 3.13 triggering voltage UTvoltage at which a VLD becomes conductive 3.14 nominal triggering voltage UTnvoltage at which the VLD becomes conductive when a d.c. voltage is applied for long term
45、Note 1 to entry: This voltage is used to identify the VLD. 3.15 instantaneous triggering voltage UTiminimum triggering voltage at which the VLD becomes conductive shortly after its application Note 1 to entry: A maximum delay of 5 ms is taken in this standard. 3.16 non-triggering voltage UWmaximum v
46、oltage below which the VLD will not trigger for any duration of the applied voltage 3.17 residual voltage Uresvalue of voltage that appears between the terminals of the VLD during the passage of a specified current 3.18 mixed voltage voltage having significant a.c. and d.c. components 3.19 response
47、time TRtime between the application of a voltage until VLD becomes conductive BS EN 50526-2:2014EN 50526-2:2014 - 8 - 4 Classes of VLD This European Standard identifies the properties and the technology of a VLD using the classes of VLD which are defined in Table 1. Table 1 Classes of voltage-limiti
48、ng device Class Method for switching between the high and low resistance status Auxiliary power supply necessary for normal operation Polarity Maximum response time TRRecoverable or not Able to interrupt the current in the VLD 1 Welding shut of metallic parts No Bidirectional 5 ms Can be recoverable
49、 in some conditionsaNo 2.1 Triggering of thyristors No Unidirectional 5 ms (for voltages equal to or higher than UTI) Yes Passive at natural zero crossing of current 2.2 Triggering of thyristors No Bidirectional 5 ms (for voltages equal to or higher than UTI) Yes Passive at natural zero crossing of current 3.1 Contactor only Yes Bidirectional Voltage dependent and not exceeding the limits given in EN 50122-1:2011, 9.3.2.2 or EN 5012
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