CLC TS 50539-12-2013 Low-voltage surge protective devices - Surge protective devices for specific application including d c - Part 12 Selection and application principles - SPDs co.pdf

1、BSI Standards PublicationLow-voltage surge protectivedevices Surge protectivedevices for specific applicationincluding d.c.Part 12: Selection and application principles SPDs connected to photovoltaic installationsPD CLC/TS 50539-12:2013National forewordThis Published Document is the UK implementatio

2、n of CLC/TS 50539-12:2013. It supersedes DD CLC/TS 50539-12:2010 which is withdrawn.The UK participation in its preparation was entrusted by Technical Com-mittee PEL/37, Surge Arresters - High Voltage, to Subcommittee PEL/37/1, Surge Arresters - Low Voltage.A list of organizations represented on thi

3、s committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 82735 8ICS 2

4、9.120.50Compliance with a British Standard cannot confer immunity from legal obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 July 2014.Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD CLC/TS

5、 50539-12:2013TECHNICAL SPECIFICATION CLC/TS 50539-12 SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION December 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management

6、Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. CLC/TS 50539-12:2013 E ICS 29.120.50 Supersedes CLC/TS 50539-12:2010 English version Low-voltage surge protective devices - Surge protec

7、tive devices for specific application including d.c. - Part 12: Selection and application principles - SPDs connected to photovoltaic installations Parafoudres basse tension - Parafoudres pour applications spcifiques incluant le courant continu - Partie 12: Principes de choix et dapplication - Paraf

8、oudres connects aux installations photovoltaques berspannungsschutzgerte fr Niederspannung - berspannungsschutzgerte fr besondere Anwendungen einschlielich Gleichspannung - Teil 12: Auswahl und Anwendungsgrundstze - berspannungsschutzgerte fr den Einsatz in Photovoltaik-Installationen This Technical

9、 Specification was approved by CENELEC on 2013-10-21. 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. CENE

10、LEC members 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 Netherla

11、nds, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. PD CLC/TS 50539-12:2013CLC/TS 50539-12:2013 - 2 - Contents Page Foreword . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions . 7 4 Systems and equipment to be protected 9

12、 5 Overvoltages in a PV installation . 9 6 Installation and location of SPDs 9 6.1 General . 9 6.2 PV installation without external LPS . 10 6.3 PV installation with external LPS when separation distance s is kept 11 6.4 PV installation with external LPS when separation distance is not kept 13 7 Equ

13、ipotential bonding. 13 8 Surge protective devices (SPD) in PV installations . 15 9 Requirements for the implementation of SPDs 15 9.1 Decision for using SPDs . 15 9.2 Selection and installation of SPDs for application in PV installation 16 9.2.1 Selection of SPDs installed at the a.c. side of PV ins

14、tallations 16 9.2.2 Selection of SPDs installed at the d.c. side of PV-installation . 18 10 Maintenance . 23 Annex A (informative) Determination of the value of Iimpor In for SPDs for different structures protected by a LPS according to a simplified approach . 24 A.1 Introduction 24 A.2 PV installat

15、ion on a building according to 6.4 . 24 A.2.1 General . 24 A.2.2 Case of voltage limiting and combination type SPDs (having voltage switching and limiting components in series) 26 A.2.3 Case of voltage switching and combination type SPDs (having voltage switching and limiting components in parallel)

16、 27 A.3 Outside free field power plant PV installation according to 6.4 . 27 A.3.1 General . 27 A.3.2 Assumption 27 A.3.3 Result 28 Annex B (informative) Characteristic of a PV source 30 B.1 General . 30 B.2 Calculation of UOCMAX31 B.3 Calculation of ISCMAX31 Annex C (normative) Simplified risk asse

17、ssment based on EN 62305-2 . 32 Bibliography 34 PD CLC/TS 50539-12:2013- 3 - CLC/TS 50539-12:2013 Figures Figure 1 Current branches vs. modes of protection of an SPD. 9 Figure 2 Installation of SPDs in case of PV installation without external LPS 10 Figure 3 Installation of SPDs in case of a buildin

18、g with external LPS when separation distance s is kept 11 Figure 4 Installation of SPDs in case of a building with external LPS when separation distance s is kept Installation with data acquisition and control system . 12 Figure 5 Installation of SPDs in case of PV installation with external LPS whe

19、n separation distance s is not kept . 13 Figure 6 Building with external LPS: Dimensions of all equipotential bonding conductors are 6 mm2except the one indicated in the figure (earthing of the SPD Type 1 located at the origin of installation) . 14 Figure 7 Building with external LPS: Dimensions of

20、equipotential bonding conductors in case of a non-isolated LPS . 15 Figure 8 Installation of SPDs on the a.c.-side and short distance between origin of installation and PV-inverter (E 10 m) 17 Figure 10 Example of an overvoltage protection on d.c. side of a PV installation 19 Figure 11 I-configurati

21、on 21 Figure 12 U-configuration 21 Figure 13 L-configuration. 21 Figure 14 -configuration 21 Figure 15 Y-configuration 22 Figure 16 Single mode SPDs to be connected in Y-configuration 22 Figure A.1 Example of a structure with two external down conductors to determine the value of the discharge curre

22、nt for the selection of SPDs . 25 Figure A.2 Example of a structure of an extended PV installation Free field PV power plant with multiple earthing and a meshed earthing system . 28 Figure B.1 Principle of a PV current source 30 Figure B.2 V/I characteristic of a non-linear PV current source 30 Figu

23、re C.1 L calculation . 33 PD CLC/TS 50539-12:2013CLC/TS 50539-12:2013 - 4 - Tables Table 1 Impulse withstand voltage UWfor equipment between PV generator and inverter 19 Table A.1 Values of I10/350and I8/20for voltage limiting and combination type SPDs (having voltage switching and limiting componen

24、ts in series) . 26 Table A.2 Values of Iimpfor voltage switching and combination type SPDs (having voltage switching and limiting components in parallel) 27 Table A.3 Values of I10/350and I8/20for SPDs intended to be used in free field PV power plant with multiple earthing and a meshed earthing syst

25、em . 29 Table C.1 Calculation of the critical length Lcrit32 PD CLC/TS 50539-12:2013- 5 - CLC/TS 50539-12:2013 Foreword This document (CLC/TS 50539-12:2013) has been prepared by CLC/TC 37A “Low voltage surge protective devices“. This document supersedes CLC/TS 50539-12:2010. CLC/TS 50539-12:2013 inc

26、ludes the following significant technical changes with respect to CLC/TS 50539-12:2010: a) scope and definitions have been revised to align CLC/TS 50539-12 with EN 50539-11; b) structure of the document has been revised for better clarification; c) only Type 1 d.c. SPDs can be used for cases describ

27、ed in 6.4; d) multi-earthed solar systems have been introduced for SPD selection and for current sharing calculation; e) Table 1 (impulse withstand) has been introduced; f) current sharing in Annex A has been revised; g) Annex B has been created; h) risk assessment has been introduced in Annex C. At

28、tention 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. PD CLC/TS 50539-12:2013CLC/TS 50539-12:2013 - 6 - 1 Scope This Technical Specification d

29、escribes the principles for selection, location, coordination and operation of SPDs to be connected to PV installations. The d.c. side is rated up to 1 500 V d.c. and the a.c. side, if any, is rated up to 1 000 V rms 50 Hz. The electrical installation starts from a PV generator or a set of interconn

30、ected PV modules with their cables, provided by the PV generator manufacturer, up to the user installation or the utility supply point. For PV installations including batteries, additional requirements will be necessary. NOTE 1 HD 60364-7-712, CLC/TS 61643-12 and EN 62305-4 are also applicable. NOTE

31、 2 This Technical Specification deals only with SPDs, and not with SPDs components integrated inside equipment. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the e

32、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. CLC/TS 61643-12, Low-voltage surge protective devices Part 12: Surge protective devices connected to low-voltage power distribution systems Selection and application princi

33、ples (IEC 61643-12) EN 50539-11, Low-voltage surge protective devices Surge protective devices for specific application including d.c. Part 11: Requirements and tests for SPDs in photovoltaic applications EN 60664-1:2007, Insulation coordination for equipment within low-voltage systems Part 1: Princ

34、iples, requirements and tests (IEC 60664-1:2007) EN 61000-4-5, Electromagnetic compatibility (EMC) Part 4-5: Testing and measurement techniques Surge immunity test (IEC 61000-4-5) EN 61643-11, Low-voltage surge protective devices Part 11: Surge protective devices connected to low-voltage power syste

35、ms Requirements and tests methods (IEC 61643-1) EN 61643-21, Low voltage surge protective devices Part 21: Surge protective devices connected to telecommunications and signalling networks Performance requirements and testing methods (IEC 61643-21) EN 62305-2:2012, Protection against lightning Part 2

36、: Risk management (IEC 62305-2:2010, mod.) EN 62305-4, Protection against lightning Part 4: Electrical and electronic systems within structures (IEC 62305-4) HD 60364-4-443, Electrical installations of buildings Part 4-44: Protection for safety Protection against voltage disturbances and electromagn

37、etic disturbances Clause 443: Protection against overvoltages of atmospheric origin or due to switching (IEC 60364-4-44) HD 60364-5-534, Low-voltage electrical installations Part 5-53: Selection and erection of electrical equipment Isolation, switching and control Clause 534: Devices for protection

38、against overvoltages (IEC 60364-5-53) ITU-T Recommendation K.20, Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents PD CLC/TS 50539-12:2013- 7 - CLC/TS 50539-12:2013 ITU-T Recommendation K.21, Resistibility of telecommunication equi

39、pment installed in customer premises to overvoltages and overcurrents 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 PV generator assembly of PV arrays connected to one input of the inverter 3.2 PV-installation erected equipment of a PV powe

40、r supply system 3.3 open-circuit maximum voltage UOC MAXmaximum voltage across an unloaded (open) PV generator, PV string, PV array or on the d.c. side of the PV inverter Note 1 to entry: Calculation of UOC MAXis performed in Annex B. 3.4 lightning protection system LPS complete system used to reduc

41、e physical damage due to lightning flashes to a structure Note 1 to entry: It consists of both external and internal lightning protection systems. SOURCE: EN 62305-1:2011, 3.42 3.5 surge protective device SPD device that contains at least one nonlinear component that is intended to limit surge volta

42、ges and divert surge currents Note 1 to entry: An SPD is a complete assembly, having appropriate connecting means. SOURCE: EN 61643-11:2012, 3.1.1 3.6 external lightning protection system part of the LPS consisting of an air-termination system, a down-conductor system and an earth-termination system

43、 SOURCE: EN 62305-1:2002, 3.43 3.7 separation distance s distance between two conductive parts at which no dangerous sparking can occur SOURCE: EN 62305-3:2011, 3.28, modified abbreviation s is added PD CLC/TS 50539-12:2013CLC/TS 50539-12:2013 - 8 - 3.8 lightning equipotential bonding EB bonding to

44、the LPS of separated conductive parts, by direct connections or via surge protective devices, to reduce potential differences caused by lightning current SOURCE: EN 62305-3:2011, 3.23 3.9 bonding bar metal bar on which metal installations, external conductive parts, electric power and telecommunicat

45、ion lines, and other cables can be bonded to an LPS SOURCE: EN 62305-3:2011, 3.24 3.10 bonding conductor conductor connecting separated conductive parts to LPS SOURCE: EN 62305-3:2011, 3.25 3.11 standard test conditions STC test conditions specified in EN 60904-3 for PV cells and PV generators 3.12

46、open circuit voltage under standard test conditions UOC STCvoltage under standard test conditions across an unloaded (open) PV generator, PV string, PV array or on the d.c. side of the PV inverter 3.13 short-circuit current under standard test conditions ISC STCshort-circuit current of a PV generato

47、r, PV string or PV array under standard test conditions 3.14 external LPS isolated from the structure to be protected LPS with an air-termination system and down-conductor system positioned in such a way that the path of the lightning current has no contact with the structure to be protected Note 1

48、to entry: In an isolated LPS, dangerous sparks between the LPS and the structure are avoided. SOURCE: EN 62305-3:2011, 3.3 PD CLC/TS 50539-12:2013- 9 - CLC/TS 50539-12:2013 3.15 current branch of an SPD intended current path, between two nodes that contains one or more protective components Note 1 t

49、o entry: A current branch of an SPD may be identical with a mode of protection of a SPD. Note 2 to entry: This intended current path does not include additional terminals. Figure 1 Current branches vs. modes of protection of an SPD SOURCE: EN 50539-11:2013, 3.1.7 4 Systems and equipment to be protected Overvoltages can destroy, degrade or cause malfunction of a PV installation. Therefore, PV installations shall be protected in presence of o