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.National forewordThis Draft for Development is the UK implementation of CLC/TS 61643-12:2009.It is derived from IEC 61643-12:2008. It supersedes DD CLC/TS 61643-12:2006 which is withdrawn.The
7、 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 secretary.This publication does not purport t
8、o 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 immunity from legal obligations.This Draft for Development was published under the authority of the St
9、andards Policy and Strategy Committee on 31 July 2010.Amendments issued since publicationAmd. No. Date Text affectedDRAFT FOR DEVELOPMENTDD CLC/TS 61643-12:2009TECHNICAL SPECIFICATION CLC/TS 61643-12 SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION December 2009 CENELEC European Committee for Electro
10、technical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische 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.
11、CLC/TS 61643-12:2009 E ICS 29.240; 29.240.10 Supersedes CLC/TS 61643-12:2006English version Low-voltage 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 ba
12、sse tension - Partie 12: Parafoudres connects aux rseaux de distribution basse tension -Principes de choix et dapplication (CEI 61643-12:2008, modifie) berspannungsschutzgerte fr Niederspannung - Teil 12: berspannungsschutzgerte fr den Einsatz in Niederspannungsanlagen - Auswahl und Anwendungsgrunds
13、tze (IEC 61643-12:2008, modifiziert) This Technical Specification was approved by CENELEC on 2009-10-30. 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
14、 keep conflicting national standards in force. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Nethe
15、rlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DD CLC/TS 61643-12:2009CLC/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 s
16、urge 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
17、.3.3 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
18、 used in conjunction with EN 61643-11:2002. _ DD CLC/TS 61643-12:2009 3 CLC/TS 61643-12:2009 Contents 0 Introduction 6 0.1 General .6 0.2 Keys to understanding the structure of this Technical Specification 6 1 Scope 8 2 Normative references 8 3 Terms, definitions and abbreviated terms .9 3.1 Terms a
19、nd 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 Characteristics of the equipment to be protected 18 5 Surge protective devices 19 5.1 Basic functions of SPD
20、s . 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 distribution systems . 27 6.1 Installation and its effect on the protection given by SPDs 27 6.
21、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 SPD technologies 45 A.1 Examples of internal circuits for one port and two port SPDs . 45 A.2 Res
22、ponse 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 class II tests . 48 B.2 Impulse waveshape for assessment of Ures. 48 B.3 Influence of a back filter
23、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 . 50 B.7 Short-circuit withstand capability test in conjunction with overcurrent protection (if
24、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.3 Presence of a lightning protection system . 60 Annex E (informative) Examples of application o
25、f 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 61643-12:2009CLC/TS 61643-12:2009 4 Annex H (informative) Examples of SPD installation in power distribution boards in
26、 some countries . 69 Annex I (informative) Short circuit backup protection and surge withstand . 72 I.1 Introduction 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
27、 estimated range of factors for reduction of single shot fuse withstand. . 73 Annex J (informative) SPD coordination 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 T
28、ype 1 SPD in case of a building protected by a LPS . 79 Bibliography . 81 Figures Figure 1 Examples of components 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
29、 . 25 Figure 5 Flowchart for SPD application 27 Figure 6 Connection Type 1 . 29 Figure 7 Connection Type 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 Elect
30、rical drawing 41 Figure A.1 Examples of one-port SPDs . 45 Figure A.2 Examples of two-port SPDs 46 Figure 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 d
31、istribution system . 52 Figure D.1 Domestic installation . 55 Figure D.2 Industrial installation . 58 Figure 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 Figu
32、re E.3 HV and LV buried lines . 63 Figure E.4 HV line overhead 63 Figure F.1 General distribution of lightning current 66 DD CLC/TS 61643-12:2009 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 b
33、e included 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 fu
34、se (or 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 sys
35、tem configuration 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 61
36、643-12:2009CLC/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, electrical systems and equipment against various overvoltages and impulse currents, such as
37、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 information : to the user about characteristics useful for the selection of an SPD. to evaluat
38、e, 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 in which they are applied. Some examples are: equipment to be protected and system character
39、istics, 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 analysis. The HD 384/60364 series of harmonised documents provides direct information for contrac
40、tors 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 the text and attention is drawn to the reader that these parts may change in future. 0.2 Keys
41、 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 annex. The main clauses provide basic information on the factors used for SPD selection. Reader
42、s 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 references where additional information may be found. Clause 3 provides definitions useful f
43、or 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 network itself as temporary overvoltages and switching surges are described. Clause 5 lists the el
44、ectrical 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 61643-12:2009 7 CLC/TS 61643-12:2009 Clause 6 is the core of this Technical Specification. It relates the stresses coming from the
45、network (as discussed in Clause 4) to the characteristics of the SPD (as discussed in Clause 5). It outlines 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
46、SPD is used in an installation (details about co-ordination may be found in Annex F). Clause 7 is an introduction 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 exa
47、mples 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 on the use of this Technical Specification. Anne
48、x E provides specific examples of the use of the risk analysis. Annex F deals with consideration when Type 1 SPDs are to be applied. Annex G discusses differences between immunity level and insulation withstand of equipments. Annex H provides practical examples of SPD installation as used in some co
49、untries. Annex I deals with surge withstand of fuses. Annex J provides SPD coordination tests principles. Annex K provides simple calculation of Iimpfor Type 1 SPDs in case of a building protected by a LPS. DD CLC/TS 61643-12:2009CLC/TS 61643-12:2009 8 1 Scope This Technical Specification describes the principles for selection, operation, location and co-ordination of SPDs to be connected to 50 Hz to 60 Hz a.c. power circuits and equip
