IEC 61643-32-2017 Low-voltage surge protective devices - Part 32 Surge protective devices connected to the d.c side of photovoltaic installations - Selection an.pdf

1、 IEC 61643-32 Edition 1.0 2017-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage surge protective devices Part 32: Surge protective devices connected to the d.c. side of photovoltaic installations Selection and application principles Parafoudres basse tension Partie 32: Parafoudres connects

2、 au ct courant continu des installations photovoltaques Principes de choix et dapplication IEC 61643-32:2017-07(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be rep

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20、voltage surge protective devices Part 32: Surge protective devices connected to the d.c. side of photovoltaic installations Selection and application principles Parafoudres basse tension Partie 32: Parafoudres connects au ct courant continu des installations photovoltaques Principes de choix et dapp

21、lication INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.240.01; 29.240.10 ISBN 978-2-8322-4583-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that yo

22、u obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 61643-32:2017 IEC 2017 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 8

23、4 Systems and equipment to be protected 12 5 Overvoltages in a PV installation . 12 6 Installation and location of SPDs . 13 6.1 General . 13 6.2 Requirements for different PV installations:. 15 6.2.1 PV installation without an external LPS 15 6.2.2 PV installation with an external LPS when the sepa

24、ration distance (s) is maintained (excluding multi-earthed solar systems, such as PV power plants) . 16 6.2.3 PV installation with an external LPS where the separation distance (s) cannot be maintained (including multi-earthed systems, such as PV power plants) . 17 6.2.4 PV installation including co

25、mmunication and signalling circuits 18 7 Equipotential bonding 18 8 Requirements for the installation of surge protective devices (SPDs) in a PV system . 19 9 Selection and installation of SPDs in PV installations 19 9.1 Selection of SPDs on the AC side . 19 9.1.1 General . 19 9.1.2 Selection of SPD

26、s with regard to nominal discharge current I nand impulse current I imp19 9.1.3 Selection of SPDs with regard to voltage protection level U P. 20 9.1.4 Installation of SPDs on the AC side . 20 9.2 Selection of SPDs installed on the DC side . 22 9.2.1 General . 22 9.2.2 Selection of SPDs with regard

27、to nominal discharge current I nand impulse current I imp22 9.2.3 Selection of U CPVof SPDs on the DC side . 22 9.2.4 Selection of SPDs with regard to voltage protection level U p. 22 9.2.5 Installation of SPDs on the DC side . 23 9.2.6 Cross-sections of connecting conductors for SPDs on the DC side

28、 24 9.2.7 Internal connection schemes of multipole SPDs or combinations of SPDs with a single mode of protection on the DC side . 25 9.2.8 Selection of I SCPVof SPDs on the DC side 26 9.2.9 Coordination of SPDs 27 10 Maintenance 27 Annex A (normative) Determination of the value of I impor I nfor SPD

29、s according to the simplified approach for different structures protected by an LPS . 28 A.1 General . 28 A.2 Building with a PV installation on the roof according to 6.2.3 29 A.3 Free- field PV power plant. 32 Annex B (informative) Characteristics of a PV source 35 IEC 61643-32:2017 IEC 2017 3 B.1

30、PV source characteristics 35 B.2 Calculation of U OC MAX. 36 B.3 Calculation of I SC MAX. 37 Annex C (informative) Additional information to clause 6: Installation and location of SPD and to clause 7: Equipotential bonding . 38 C.1 PV installation including communication and signalling circuits . 38

31、 C.2 PV installation and dimensions of equipotential bonding conductors . 40 Annex D (informative) Exceptions in the USA related to Class I tested SPDs . 42 Bibliography 43 Figure 1 Installation of SPDs in the case of a building without an external LPS . 15 Figure 2 Installation of SPDs in the case

32、of a PV installation with an external LPS where the separation distance (s) is maintained 16 Figure 3 Installation of SPDs in the case of a PV-installation with an external LPS where the separation distance (s) cannot be maintained . 17 Figure 4 Installation of SPDs on the AC side with a short dista

33、nce between the origin of the installation and the PV inverter (E 10 m) 21 Figure 5 Installation of SPDs on the AC side with a long distance between the origin of the installation and the PV inverter (E 10 m) 21 Figure 6 Example of overvoltage protection on the DC side of a PV installation 24 Figure

34、 7 Example of SPD connections on the DC side of an unearthed PV source 25 Figure 8 Example of SPD connection on the DC side of a reliable earthed PV source . 26 Figure A.1 Example of a structure with two external down conductors to determine the value of the discharge current for the selection of SP

35、Ds . 30 Figure A.2 Example of the structure of an extended PV installation. A PV power plant with multiple earthing and a meshed earthing system . 33 Figure B.1 Schematic of a PV current source . 35 Figure B.2 U/I characteristics of a non-linear PV current source . 35 Figure C.1 Example of SPDs inst

36、alled on a PV system protected by an external LPS where the separation distance (s) is maintained Installation includes data acquisition and control system 39 Figure C.2 Example of a building with an external LPS Dimensions of equipotential bonding conductors when the separation distance (s) is main

37、tained, or an isolated LPS is used 40 Figure C.3 Example of a building with an external LPS Dimensions of equipotential bonding conductors when the separation distance (s) is not maintained 41 Table 1 Selection of SPD test class and cross section of bonding conductor . 14 Table 2 Rated impulse volta

38、ge U wfor equipment between PV array and inverter (where no other information is available) . 23 Table A.1 Values of I imp(I 10/350 ) and I n(I 8/20 ) for voltage-limiting SPDs on the DC side of a PV installation mounted on the roof of a building with an external LPS if the separation distance is no

39、t maintained . 31 Table A.2 Values of I imp(I 10/350 ) for voltage-switching SPDs on the DC side of a PV installation mounted on the roof of a building with an external LPS, if the separation distance is not maintained . 31 Table A.3 Values of I imp(I 10/350) and I n(I 8/20 ) for SPDs used on the DC

40、 side in PV power plants with a central inverter, multiple earthing and a meshed earthing system. 33 4 IEC 61643-32:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE SURGE PROTECTIVE DEVICES Part 32: Surge protective devices connected to the d.c. side of photovoltaic installation

41、s Selection and application principles FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all ques

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