1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLow-voltage surge protective devicesPart 12: Surge protective devices connected to low-voltage power distribution systems Selection and application principlesDD CLC/TS 61643-12:2
2、009This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application can be obtained.A PAS
3、 is a Technical Specification not fulfilling the requirements for a standard, but made available to the public and established in an organization operating under a given procedure.A review of this Draft for Development will be carried out not later than three years after its publication.Notification
4、 of the start of the review period, with a request for the submission of comments from users of this Draft for Development, will be made in an announcement in the appropriate issue of Update Standards. According to the replies received, BSI Technical Committee EPL/49 will judge whether the validity
5、of the PAS should be extended for a further three years or what other action should be taken and pass their comments on to the relevant international committee.Observations which it is felt should receive attention before the official call for comments will be welcomed. These should be sent to the S
6、ecretary of BSI Technical Committee EPL/49 at British Standards House, 389 Chiswick High Road, London W4 4AL.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSINational forewordThis Draft for Development is the UK implementation of CLC/TS 61643-12:2009
7、.It is derived from IEC 61643-12:2008. It supersedes DD CLC/TS 61643-12:2006 which is withdrawn.The UK participation in its preparation was entrusted by Technical CommitteePEL/37, Surge Arresters - High Voltage, to Subcommittee PEL/37/1, SurgeArresters -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 represent
8、ed on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010 ISBN 978 0 580 71574 7 ICS 29.240.10Compliance with a British Standard cannot confer imm
9、unity from legal obligations.This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 31 July 2010.Amendments issued since publicationAmd. No. Date Text affectedDRAFT FOR DEVELOPMENTDD CLC/TS 61643-12:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHI
10、NA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSITECHNICAL SPECIFICATION CLC/TS 61643-12 SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION December 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elekt
11、rotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. CLC/TS 61643-12:2009 E ICS 29.240; 29.240.10 Supersedes CLC/TS 61643-12:2006English version Low-voltag
12、e surge protective devices - Part 12: Surge protective devices connected to low-voltage power distribution systems - Selection and application principles (IEC 61643-12:2008, modified) Parafoudres basse tension - Partie 12: Parafoudres connects aux rseaux de distribution basse tension -Principes de c
13、hoix et dapplication (CEI 61643-12:2008, modifie) berspannungsschutzgerte fr Niederspannung - Teil 12: berspannungsschutzgerte fr den Einsatz in Niederspannungsanlagen - Auswahl und Anwendungsgrundstze (IEC 61643-12:2008, modifiziert) This Technical Specification was approved by CENELEC on 2009-10-3
14、0. CENELEC members are required to announce the existence of this TS in the same way 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 commi
15、ttees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, 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 Unit
16、ed Kingdom. DD CLC/TS 61643-12:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSICLC/TS 61643-12:2009 2 Foreword This Technical Specification consists of the text of the International Standard IEC 61643-12:2008 prepared by SC 37A, Low-voltage surg
17、e protective devices, of IEC TC 37, Surge arresters, together with the common modifications prepared by the Technical Committee CENELEC TC 37A, Low voltage surge protective devices. The text of the draft was circulated for voting in accordance with the Internal Regulations, Part 2, Subclause 11.3.3.
18、3 and was accepted by CENELEC as CLC/TS 61643-12 on 2009-10-30. This Technical Specification supersedes CLC/TS 61643-12:2006. The following date was fixed: latest date by which the existence of the CLC/TS has to be announced at national level (doa) 2010-04-30 This Technical Specification is to be us
19、ed in conjunction with EN 61643-11:2002. _ DD CLC/TS 61643-12:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSI 3 CLC/TS 61643-12:2009 Contents 0 Introduction 6 0.1 General .6 0.2 Keys to understanding the structure of this Technical Specificatio
20、n 6 1 Scope 8 2 Normative references 8 3 Terms, definitions and abbreviated terms .9 3.1 Terms and definitions 9 3.2 List of variables and abbreviations used in this Technical Specification . 14 4 Systems and equipment to be protected 15 4.1 Low-voltage power distribution systems 15 4.2 Characterist
21、ics of the equipment to be protected 18 5 Surge protective devices 19 5.1 Basic functions of SPDs . 19 5.2 Additional requirements . 19 5.3 Classification of SPDs 19 5.4 Characteristics of SPDs . 21 5.5 Additional information on characteristics of SPDs . 22 6 Application of SPDs in low-voltage power
22、 distribution systems . 27 6.1 Installation and its effect on the protection given by SPDs 27 6.2 Selection of SPD 35 6.3 Characteristics of auxiliary devices 43 7 Risk analysis. 43 8 Co-ordination where equipment has both signalling and power terminals 44 Annex A (informative) Examples of various S
23、PD technologies 45 A.1 Examples of internal circuits for one port and two port SPDs . 45 A.2 Response of SPDs to a combination wave impulse 47 Annex B (informative) Explanation of testing procedures used in EN 61643-11 . 48 B.1 Determination of Uresfor SPDs tested in accordance with class I and clas
24、s II tests . 48 B.2 Impulse waveshape for assessment of Ures. 48 B.3 Influence of a back filter on determination of Ures48 B.4 Operating duty test for SPDs . 49 B.5 TOV failure test 50 B.6 Differences in the testing conditions of Type 1 (test class I), 2 (test class II) and 3 (tests class III) SPDs
25、. 50 B.7 Short-circuit withstand capability test in conjunction with overcurrent protection (if any) 51 Annex C (informative) Partial lightning current calculations . 52 Annex D (informative) Examples of application of CLC/TS 61643-12 . 54 D.1 Domestic application 54 D.2 Industrial application 55 D.
26、3 Presence of a lightning protection system . 60 Annex E (informative) Examples of application of the risk analysis . 61 Annex F (informative) Consideration for SPDs when Type 1 SPDs are to be applied 65 Annex G (informative) Immunity versus insulation withstand . 67 DD CLC/TS 61643-12:2009Licensed
27、Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSICLC/TS 61643-12:2009 4 Annex H (informative) Examples of SPD installation in power distribution boards in some countries . 69 Annex I (informative) Short circuit backup protection and surge withstand . 72 I.1 I
28、ntroduction 72 I.2 Information single shot 8/20 and 10/350 fuses withstand. . 72 I.3 Fuse influencing factors (reduction) for preconditioning and operating duty test 73 I.4 Specific examples with estimated range of factors for reduction of single shot fuse withstand. . 73 Annex J (informative) SPD c
29、oordination test principles . 75 J.1 Introduction 75 J.2 Coordination criteria . 75 J.3 Coordination techniques 75 J.4 Coordination test 76 Annex K (informative) Simple calculation of Iimpfor a Type 1 SPD in case of a building protected by a LPS . 79 Bibliography . 81 Figures Figure 1 Examples of co
30、mponents and combinations of components . 20 Figure 2 Relationship between Up, U0, Ucand Ucs. 22 Figure 3 Typical curve of Uresversus I for ZnO varistors 25 Figure 4 Typical curve for a spark gap . 25 Figure 5 Flowchart for SPD application 27 Figure 6 Connection Type 1 . 29 Figure 7 Connection Type
31、2 . 30 Figure 8 Influence of SPD connecting lead lengths . 33 Figure 9 Need for additional protection 34 Figure 10 Flowchart for the selection of an SPD 35 Figure 11 Typical use of two SPDs Electrical drawing 41 Figure A.1 Examples of one-port SPDs . 45 Figure A.2 Examples of two-port SPDs 46 Figure
32、 A.3 Response of one-port and two-port SPDs to a combination wave impulse . 47 Figure B.1 Test setting . 50 Figure C.1 Simple calculation of the sum of partial lightning currents into the power distribution system . 52 Figure D.1 Domestic installation . 55 Figure D.2 Industrial installation . 58 Fig
33、ure D.3 Industrial installation circuitry 59 Figure D.4 Example for a lightning protection system 60 Figure E.1 HV and LV overhead lines 62 Figure E.2 HV overhead line and buried LV lines 63 Figure E.3 HV and LV buried lines . 63 Figure E.4 HV line overhead 63 Figure F.1 General distribution of ligh
34、tning current 66 DD CLC/TS 61643-12:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSI 5 CLC/TS 61643-12:2009 Figure H.1 Wiring diagram of an SPD connected on the load side of the main incoming isolator via a separate isolator (which could be incl
35、uded in SPD enclosure) 69 Figure H.2 SPD connected to the nearest available outgoing way (MCB) to the incoming supply (TNS installation typically seen in the UK) . 70 Figure H.3 Single line-wiring diagram of an SPD connected in shunt on the first outgoing way of the distribution panel via a fuse (or
36、 MCB) . 71 Figure J.1 SPDs arrangement for the coordination test . 77 Tables Table 1 Maximum TOV values as given in IEC 60364-4-44 18 Table 2 Preferred values of Iimp24 Table 3 Possible modes of protection for various LV systems. 31 Table 4 Minimum required Ucof the SPD dependent on supply system co
37、nfiguration 36 Table 5 Typical TOV test values 37 Table I.1 Examples of ratio between single shot withstand and full preconditioning/operating duty test . 74 Table J.1 Test procedure for coordination 78 Table K.1 Determination of the value of Iimpon the AC side of PV generators 80 DD CLC/TS 61643-12
38、:2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSICLC/TS 61643-12:2009 6 0 Introduction 0.1 General This Technical Specification is to be used with EN 61643-11:2002. Surge protective devices (SPDs) are used to protect, under specified conditions,
39、 electrical systems and equipment against various overvoltages and impulse currents, such as lightning and switching surges. SPDs shall be selected in accordance with their environmental conditions and the acceptable failure rate of the equipment and the SPDs. This Technical Specification provides i
40、nformation : to the user about characteristics useful for the selection of an SPD. to evaluate, with reference to EN 62305-1 to EN 62305-4 and HD 384/60364 series, the need for using SPDs in low-voltage systems. on selection and co-ordination of SPDs, while taking into account the entire environment
41、 in which they are applied. Some examples are: equipment to be protected and system characteristics, insulation levels, overvoltages, method of installation, location of SPDs, co-ordination of SPDs, failure mode of SPDs and equipment failure consequences. and provides guidance to perform a risk anal
42、ysis. The HD 384/60364 series of harmonised documents provides direct information for contractors on the installation of SPDs. For the purpose of having a usable and complete working document, parts from existing documents have been duplicated where necessary. Such parts are explicitly mentioned in
43、the text and attention is drawn to the reader that these parts may change in future. 0.2 Keys to understanding the structure of this Technical Specification The list below summarizes the structure of this Technical Specification and provides a summary of the information covered in each clause and an
44、nex. The main clauses provide basic information on the factors used for SPD selection. Readers who wish to obtain more detail on the information provided in Clauses 4 to 7 should refer to the relevant annexes. Clause 1 describes the scope of this Technical Specification. Clause 2 lists the normative
45、 references where additional information may be found. Clause 3 provides definitions useful for the comprehension of this Technical Specification. Clause 4 addresses the parameters of systems and equipment relevant to SPDs. In addition to the stresses created by lightning, those created by the netwo
46、rk itself as temporary overvoltages and switching surges are described. Clause 5 lists the electrical parameters used in the selection of an SPD and gives some explanation regarding these parameters. These are related to the data given in EN 61643-11. DD CLC/TS 61643-12:2009Licensed Copy: Wang Bin,
47、ISO/EXCHANGE CHINA STANDARDS, 09/10/2010 08:55, Uncontrolled Copy, (c) BSI 7 CLC/TS 61643-12:2009 Clause 6 is the core of this Technical Specification. It relates the stresses coming from the network (as discussed in Clause 4) to the characteristics of the SPD (as discussed in Clause 5). It outlines
48、 how the protection given by SPDs may be affected by its installation. The different steps for the selection of an SPD are presented including the problems of co-ordination when more than one SPD is used in an installation (details about co-ordination may be found in Annex F). Clause 7 is an introdu
49、ction to the risk analysis (considerations of when the use of SPDs is beneficial). Clause 8 deals with co-ordination between signalling and power lines (under consideration). Annex A gives examples of various SPD technologies. Annex B deals with explanations of testing procedures used in EN 61643-11. Annex C deals with the calculation of the sharing of lightning current between different earthing systems. Annex D provides specific examples
