1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLow voltage d.c. surge protectivedevice for traction systems Selection and application rules forsurge arrestersDD CLC/TS 50544:2010National forewordThis Draft for Development is
2、the UK implementation of CLC/TS 50544:2010.The UK participation in its preparation was entrusted by Technical CommitteePEL/37, Surge Arresters - High Voltage, to Subcommittee PEL/37/1, SurgeArresters - Low Voltage.A list of organizations represented on this committee can be obtained onrequest to its
3、 secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 69171 3ICS 29.120.50; 29.280Compliance with a British Standard cannot confer immunity fromlegal obligations.This Draft for Deve
4、lopment was published under the authority of theStandards Policy and Strategy Committee on 30 April 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDDD CLC/TS 50544:2010TECHNICAL SPECIFICATION CLC/TS 50544 SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION February 201
5、0 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved
6、worldwide for CENELEC members. Ref. No. CLC/TS 50544:2010 E ICS 29.120.50; 29.280 English version Low voltage d.c. surge protective device for traction systems - Selection and application rules for surge arresters Parafoudres basse tension courant continu pour traction - Principes de choix et dappli
7、cation pour les parafoudres berspannungsschutzgerte fr Niederspannungs-Gleichstrom-Bahnsysteme - Auswahl und Anwendungsregeln fr berspannungsableiter This Technical Specification was approved by CENELEC on 2009-12-25. CENELEC members are required to announce the existence of this TS in the same way
8、as for an EN and to make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Es
9、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DD CLC/TS 50544:2010CLC/TS 50544:2010 2 Foreword This Technical
10、Specification was prepared by the Technical Committee CENELEC TC 37A, Low voltage surge protective devices. It also concerns the expertise of SC 9XC, Electric supply and earthing systems for public transport equipment and ancillary apparatus (Fixed installations), of Technical Committee CENELEC TC 9
11、X, Electrical and electronic applications for railways. The broad subject of overvoltage protection in d.c. traction systems need to address the approaches, requirements and definitions of several disciplines and TCs. Concerned European Standards are referenced for generic definitions. This Technica
12、l Specification reflects the common practise of overvoltage protection in the d.c. traction community, as far as protection of equipment in the primary power supply is concerned (e.g. feeders, overhead contact lines, return circuits, power side of rolling stock). Therefore, definitions and approache
13、s in this Technical Specification, covering a specific application in line with EN 50526-1, are different for some aspects from the definitions and approaches in the EN 61643 series. The text of the draft was circulated for voting in accordance with the Internal Regulations, Part 2, Subclause 11.3.3
14、.3. and was approved by CENELEC as CLC/TS 50544 on 2009-12-25. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following date is prop
15、osed: latest date by which the existence of the CLC/TS has to be announced at national level (doa) 2010-06-25 This Technical Specification will be withdrawn once the SC 9XC document 1)on the same subject is published. _ 1)Under development at the time of issue. DD CLC/TS 50544:2010 3 CLC/TS 50544:20
16、10 Contents 1 Scope . 5 2 Normative references . 5 3 Terms and definitions 5 3.1 System voltages . 5 3.2 Arrester . 7 4 Systems and equipment to be protected . 9 4.1 General . 9 4.2 Substations . 9 4.3 Overhead contact line system 10 4.4 Return circuit 11 4.5 Rolling stock .12 5 Supply voltages 13 6
17、 Overvoltages .13 6.1 Lightning overvoltages 13 6.2 Switching overvoltages .14 7 Function and characteristics of MO surge arresters 14 7.1 Basic function .14 7.2 Characteristics 15 7.3 Classification 16 8 Insulation co-ordination and application of MO surge arresters .17 8.1 General .17 8.2 Principl
18、es of insulation co-ordination 17 8.3 Protective distance .19 8.4 Protection level .22 8.5 Surge arresters connected in parallel .22 9 Selection of MO surge arresters .23 9.1 Continuous operating voltage Uc23 9.2 Arrester class 23 9.3 Mechanical considerations .23 Annex A (informative) Supply voltag
19、es 24 Bibliography 25 Figures Figure 1 Protective circuit in a substation (principle arrangement) .10 Figure 2 Principle of a protective circuit of a line (outdoor system) 11 Figure 3 Installation of surge arresters on the overhead contact line and the running rails .12 Figure 4 Surge arrester arran
20、gement on a vehicle .13 Figure 5 Current-voltage characteristic of an MO surge arrester 15 Figure 6 Requirements and design of surge arresters 17 Figure 7 Assumption for the calculation of the voltage at the open end of a line and for the determination of the protective distance L .20 Figure 8 Volta
21、ge funnel and illustration of protective distance 21 DD CLC/TS 50544:2010CLC/TS 50544:2010 4 Tables Table 1 Arrester classification and related parameters. 16 Table 2 Insulation levels 18 Table A.1 Supply voltages .24 DD CLC/TS 50544:2010 5 CLC/TS 50544:2010 1 Scope This Technical Specification appl
22、ies to non linear metal-oxide resistor type surge arresters (MO surge arresters) without spark gaps designed to limit voltage surges on d.c. traction systems with nominal voltage up to 1 500 V. This Technical Specification applies to protection of equipment. Same principles for selection and applica
23、tion apply for MO surge arresters on d.c. traction systems with nominal voltage 3 000 V. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition
24、of the referenced document (including any amendments) applies. EN 50122-2 Railway applications Fixed installations Part 2: Protective provisions against the effects of stray currents caused by d.c. traction systems EN 50124-1 Railway applications Insulation coordination Part 1: Basic requirements Cl
25、earances and creepage distances for all electrical and electronic equipment EN 50163 Railway applications Supply voltages of traction systems EN 50526-1 1)Railway applications Fixed installations D.C. surge arresters and voltage limiting devices Part 1: Surge arresters EN 60071-1 Insulation co-ordin
26、ation Part 1: Definitions, principles and rules (IEC 60071-1) EN 62305-3 Protection against lightning Part 3: Physical damage to structures and life hazard (IEC 62305-3, mod.) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 System voltages 3.
27、1.1 nominal voltage Un designated value for a system EN 50163 3.1.2 highest permanent voltage Umax1 maximum value of the voltage likely to be present indefinitely EN 50163 1)At draft stage. DD CLC/TS 50544:2010CLC/TS 50544:2010 6 3.1.3 highest non permanent voltage Umax2 maximum value of the voltage
28、 likely to be present as highest non permanent voltage for a limited period of time EN 50163 3.1.4 highest long term overvoltage Umax3 voltage defined as the highest value of the long-term overvoltage for t = 20 ms. This value is independent from frequency EN 50163 3.1.5 rated insulation voltage UNm
29、 d.c. withstand voltage value assigned by the manufacturer to the equipment or part of it, characterizing the specified permanent (over five minutes) withstand capability of its insulation EN 50124-1, mod. 3.1.6 rated impulse voltage UNi impulse voltage value assigned by the manufacturer to the equi
30、pment or a part of it, characterizing the specified withstand capability of its insulation against transient overvoltages EN 50124-1 3.1.7 overvoltage any voltage having a peak value exceeding the corresponding peak value (including recurrent overvoltages) of maximum steady-state voltage at normal o
31、perating conditions EN 50124-1 3.1.8 long-term overvoltage overvoltage higher than Umax2lasting typically more than 20 ms, due to low impedance phenomena e.g. a rise in substation primary voltage EN 50163 3.1.9 transient overvoltage short duration overvoltage of a few milliseconds or less due to cur
32、rent transfers EN 50124-1 3.1.10 switching overvoltage transient overvoltage at any point of the system due to specific switching operation or fault EN 50124-1 3.1.11 lightning overvoltage transient overvoltage at any point of the system due to a specific lightning discharge EN 50124-1 DD CLC/TS 505
33、44:2010 7 CLC/TS 50544:2010 3.2 Arrester 3.2.1 surge protective device SPD device that is intended to limit transient overvoltages and divert surge currents. It contains at least one nonlinear component EN 61643-11 3.2.2 voltage limiting type SPD SPD that has a high impedance when no surge is presen
34、t, but will reduce it continuously with increased surge current and voltage. Common examples of components used as nonlinear devices are varistors and suppressor diodes. These SPDs are sometimes called “clamping type” EN 61643-11 3.2.3 surge arrester device intended to limit transient overvoltages t
35、o a specified level NOTE Surge arrester, or shorter “arrester”, is a more general term for metal-oxide surge arrester (see 3.2.4). Surge arresters contain one or more nonlinear metal-oxide resistors (MO resistor). A nonlinear metal-oxide resistor (MO resistor) is the same as a variable metal-oxide r
36、esistor (MO varistor). EN 50526-1 3.2.4 metal-oxide surge arrester without gaps arrester having non-linear metal-oxide resistors connected in series and/or in parallel without any integrated series or parallel spark gaps EN 60099-4 3.2.5 maximum continuous operating voltage of an arrester Ucdesignat
37、ed permissible value of d.c. voltage that may be applied continuously between the arrester terminals EN 60099-4, mod. 3.2.6 rated voltage of an arrester Ur voltage by which the arrester is designated. For d.c. traction systems the rated voltage is the maximum continuous operating voltage EN 60099-4,
38、 mod. 3.2.7 charge transfer capability maximum charge per impulse that can be transferred during the charge transfer test and during the operating duty test EN 50526-1, mod. 3.2.8 discharge current of an arrester impulse current which flows through the arrester EN 50526-1 DD CLC/TS 50544:2010CLC/TS
39、50544:2010 8 3.2.9 nominal discharge current of an arrester In peak value of lightning current impulse which is used to classify an arrester EN 60099-4 3.2.10 high current impulse of an arrester peak value of discharge current having a 4/10 s impulse shape EN 60099-4 3.2.11 steep current impulse cur
40、rent impulse with a virtual front time of 1 s with limits in the adjustment of equipment such that the measured values are from 0,9 s to 1,1 s, and the virtual time to half value on the tail shall be not longer than 20 s EN 60099-4 3.2.12 lightning current impulse 8/20 current impulse with limits on
41、 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 EN 60099-4 3.2.13 direct lightning current impulse impulse defined by the charge Q and the peak value of the current impulse Iimp EN
42、50526-1 3.2.14 long duration current impulse rectangular impulse which rises rapidly to maximum value, remains substantially constant for a specified period and then falls rapidly to zero EN 60099-4 3.2.15 switching current impulse of an arrester the peak value of discharge current having a virtual
43、front time greater than 30 s but less than 100 s and a virtual time to half value on the tail of roughly twice the virtual front time EN 60099-4 3.2.16 continuous current of an arrester Ic current flowing through the arrester when energized at the continuous operating voltage EN 60099-4 3.2.17 refer
44、ence current of an arrester Iref d.c. current defined by the manufacturer used to determine the reference voltage of the arrester EN 60099-4, mod. DD CLC/TS 50544:2010 9 CLC/TS 50544:2010 3.2.18 reference voltage of an arrester Uref d.c. voltage applied to the arrester to obtain the reference curren
45、t EN 60099-4, mod. 3.2.19 residual voltage of an arrester Ures peak value of voltage that appears between the terminals of an arrester during the passage of discharge current EN 60099-4 4 Systems and equipment to be protected 4.1 General Electrical traction d.c. systems should be protected against o
46、vervoltages by surge arresters. Main field of application are in substations, at sectioning posts and at singular points along the contact lines. The terminations of the insulated cables connected to the contact line system and the electronic apparatuses connected to the return pole of the rectifier
47、 in the substations should be protected by surge arresters. 4.2 Substations An important element of a lightning protection concept is the protection of the line feeders and return conductors in the substations with arresters (see Figure 1). The arresters have the following functions. The arresters A
48、1, which are connected in the substation between the feeder circuit-breakers (cable connection) and the return circuit, reduce the overvoltages at the feeder circuit-breakers and the rectifiers, inclusive of their measuring and monitoring devices, in case of positive lightning strokes. In case of ne
49、gative lightning strokes the diodes of the rectifier are conductive, but this does not endanger the elements. The arrester A2 between the return circuit and the structure earth is to limit overvoltages of the running rails. The arrester A2 is also important in case of direct lightning strokes into the running rails, e.g. if lines above earth have a conductor rail. The arrester A2 is not
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