1、 IEC 61921 Edition 2.0 2017-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Power capacitors Low-voltage power factor correction banks Condensateurs de puissance Batteries de compensation du facteur de puissance basse tension IEC 61921:2017-06(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright
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19、uestions contactez-nous: csciec.ch. IEC 61921 Edition 2.0 2017-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Power capacitors Low-voltage power factor correction banks Condensateurs de puissance Batteries de compensation du facteur de puissance basse tension INTERNATIONAL ELECTROTECHNICAL COMMISSIO
20、N COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 31.060.70 ISBN 978-2-8322-4423-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor.
21、Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 61921:2017 IEC 2017 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 Marking of a capacitor bank . 7 5 Service conditions . 8 6 Guide for design, installation, o
22、peration and safety 8 6.1 General . 8 6.2 Design 8 6.2.1 Choice of rated voltage 8 6.2.2 Switching and overload protection . 9 6.3 Installation and operation 10 6.3.1 Electrical environment . 10 6.3.2 Secondary effects of the capacitor bank 10 6.3.3 Overvoltages . 10 6.3.4 Overload currents 10 6.4 S
23、afety . 11 6.4.1 Discharging devices. 11 6.4.2 Discharging after disconnection . 11 6.4.3 Fire hazard in case of failure . 12 6.4.4 Human and property damage . 12 6.4.5 Busbar . 12 6.4.6 Connection of systems. 12 7 Design verification . 12 7.1 General . 12 7.2 Strength of material and parts . 12 7.3
24、 Verification of degree of protection of enclosures 12 7.4 Verification of clearances and creepage distances 12 7.5 Protection against electric shock and integrity of protective circuits 13 7.6 Incorporation of switching devices and components 13 7.7 Internal electrical circuits and connections 13 7
25、.8 Terminals for external conductors . 13 7.9 Verification of dielectric properties 13 7.10 Verification of temperature-rise limits 13 7.11 Verification of short-circuit withstand strength . 13 7.12 Electromagnetic compatibility 13 7.13 Verification of mechanical operation 14 8 Routine verification
26、14 8.1 General . 14 8.2 Degree of protection of enclosures 14 8.3 Clearances and creepage distances 14 8.4 Protection against electric shock and integrity of protective circuits 14 8.5 Incorporation of built-in components . 14 8.6 Internal electrical circuits and connections 14 8.7 Terminals for ext
27、ernal conductors . 14 IEC 61921:2017 IEC 2017 3 8.8 Mechanical operation 14 8.9 Dielectric properties 14 8.10 Wiring, operational performance and function, including verification of rated output . 15 Annex A (normative) Minimum and maximum cross-sections of copper conductors suitable for connections
28、 16 Annex B (informative) Formulae for capacitors and installations 17 B.1 Computation of the output of three-phase capacitors from three single-phase capacitance measurements . 17 B.2 Resonance frequency . 17 B.3 Voltage rise 17 B.4 Inrush transient current . 18 B.4.1 Switching in of a single capac
29、itor . 18 B.4.2 Switching of capacitors in parallel with energized capacitor(s) . 18 B.4.3 Discharge resistance in single-phase units or in one-phase or polyphase units . 18 Annex C (informative) Definition of similar designs for capacitor bank 19 Annex D (informative) Methods for connecting additio
30、nal capacitors for performing temperature rise test . 20 Bibliography 21 Figure D.1 Configurations for temperature rise test 20 4 IEC 61921:2017 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ POWER CAPACITORS LOW-VOLTAGE POWER FACTOR CORRECTION BANKS FOREWORD 1) The International Electrotechni
31、cal 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 questions concerning standardization in the electrical and electronic fields. To this
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40、Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC
41、Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61921 has been prepared by IEC technical committee 33: Power capacitors and their applications. This second edition cancels and replaces the fi
42、rst edition published in 2003. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: numerous changes regarding verification methods to align with IEC 61439-1; modification of marking; add routine verification of
43、rated output; new Annex D with guidance on methods for temperature rise verification; update of normative references; general editorial review. IEC 61921:2017 IEC 2017 5 The text of this International Standard is based on the following documents: FDIS Report on voting 33/607/FDIS 33/611/RVD Full inf
44、ormation on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this document will remain unchang
45、ed until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific document. At this date, the document will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC 61921:2017 IEC 2017 POWER CAPACITORS LOW-VOLTAGE POWER FACT
46、OR CORRECTION BANKS 1 Scope This International Standard is applicable to low-voltage AC shunt capacitor banks intended to be used for power factor correction purposes, possibly equipped with a built-in switchgear and controlgear apparatus capable of connecting to or disconnecting from the mains part
47、(s) of the bank with the aim to correct its power factor. Low-voltage power factor correction banks if not otherwise indicated hereinafter and where applicable comply with the requirements of IEC 61439-1 and IEC 61439-2. 2 Normative references The following documents are referred to in the text in s
48、uch a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61439-1:2011, Low-voltage switchgear and controlg
49、ear assemblies Part 1: General rules IEC 61439-2:2011, Low-voltage switchgear and controlgear assemblies Part 2: Power switchgear and controlgear assemblies IEC 60831-1:2014, Shunt power capacitors of the self-healing type for AC systems having a rated voltage up to and including 1 000 V Part 1: General Performance, testing and rating Safety requirements Guide for installation and operation IEC 60931-1:1996, Shunt powe
