1、 IEC 60871-4 Edition 2.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Shunt capacitors for AC power systems having a rated voltage above 1 000 V Part 4: Internal fuses Condensateurs shunt pour rseaux courant alternatif de tension assigne suprieure 1 000 V Partie 4: Fusibles internes IEC 60871
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19、store.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60871-4 Edition 2.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Shunt capacitors for AC power systems having a rated voltage above 1 000 V Part 4: I
20、nternal fuses Condensateurs shunt pour rseaux courant alternatif de tension assigne suprieure 1 000 V Partie 4: Fusibles internes INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE L ICS 29.240.99; 31.060.70 PRICE CODE CODE PRIX ISBN 978-2-8322-1495-4 Registered tra
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22、 2 IEC 60871-4:2014 IEC 2014 CONTENTS FOREWORD . 3 1 Scope and object . 5 2 Normative references 5 3 Terms and definitions 5 4 Performance requirements. 5 4.1 General . 5 4.2 Disconnecting requirements 6 4.3 Withstand requirements 6 5 Tests . 6 5.1 Routine tests. 6 5.1.1 General . 6 5.1.2 Discharge
23、test . 7 5.2 Type tests . 7 5.3 Disconnecting test on fuses 7 5.3.1 Test procedures . 7 5.3.2 Capacitance measurement 8 5.3.3 Inspection of the unit . 8 5.3.4 Voltage test after opening the container . 8 Annex A (normative) Test procedures for the disconnecting test on internal fuses . 9 A.1 General
24、 . 9 A.2 Test procedures 9 Annex B (informative) Guide for coordination of fuse protection . 11 B.1 General . 11 B.2 Protection sequence . 11 IEC 60871-4:2014 IEC 2014 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SHUNT CAPACITORS FOR AC POWER SYSTEMS HAVING A RATED VOLTAGE ABOVE 1 000 V Part 4: Int
25、ernal fuses 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 questions concerning standardiz
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34、of the publication, use of, or reliance upon, this IEC 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
35、 the possibility that some of the elements of this IEC 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 60871-4 has been prepared by IEC technical committee 33: Power capacitors and their appl
36、ications. This second edition cancels and replaces the first edition published in 1996. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: The disconnecting requirements have been modified. 4 IEC 6087
37、1-4:2014 IEC 2014 The text of this standard is based on the following documents: FDIS Report on voting 33/548/FDIS 33/561/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accor
38、dance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60871 series, published under the general title Shunt capacitors for AC power systems having a rated voltage above 1 000 V, can be found on the IEC website. The committee has decided that the contents of this publication will
39、remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IEC 60871-4:2014 IEC 2014 5 SHUNT CAPACITORS
40、 FOR AC POWER SYSTEMS HAVING A RATED VOLTAGE ABOVE 1 000 V Part 4: Internal fuses 1 Scope and object This part of IEC 60871 applies to internal fuses which are designed to isolate faulty capacitor elements, in order to allow operation of the remaining parts of that capacitor unit and the bank in whi
41、ch the capacitor unit is connected. Such fuses are not a substitute for a switching device such as a circuit-breaker, or for external protection of the capacitor bank or any part thereof. The object of this part of IEC 60871 is to formulate requirements regarding performance and testing and to provi
42、de a guide for coordination of fuse protection. 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 edition cited applies. For undated references, the latest edition
43、 of the referenced document (including any amendments) applies. IEC 60871-1:2005, Shunt capacitors for a.c. power systems having a rated voltage above 1000 V Part 1: General 3 Terms and definitions For the purpose of this part of IEC 60871, the terms and definitions in IEC 60871-1, as well as the fo
44、llowing, apply. 3.1 rated voltage of a capacitor element U Ner.m.s. value of the alternating voltage for which the capacitor element has been designed 4 Performance requirements 4.1 General The fuse is connected in series to the element(s) which the fuse is intended to isolate if the element(s) beco
45、mes faulty. The range of currents and voltages for the fuse is therefore dependent on the capacitor design, and in some cases also on the bank in which the fuse is connected. The requirements are valid for a bank or a capacitor switched by restrike-free circuit-breakers. If the circuit-breakers are
46、not restrike-free, other requirements shall be agreed between manufacturer and purchaser. The operation of an internal fuse is in general determined by one or both of the two following factors: 6 IEC 60871-4:2014 IEC 2014 the discharge energy from elements or units connected in parallel with the fau
47、lty element or unit; the power-frequency fault current. The additional current and voltage resulting from the blowing of some fuses should be taken into account in the design. 4.2 Disconnecting requirements The fuse shall enable the faulty element to be disconnected when electrical breakdown of elem
48、ents occurs in a voltage range, in which Ne 1 2 0,9 U u = is the lowest, and Ne 2 2 2,5 U u = is the highest (instantaneous) value of the element voltage at the instant of fault. The range u 1to u 2is based on the voltage that might occur across the capacitor element at the instant of electrical bre
49、akdown. The u 2value is of a transient nature, mostly related to switching operations, and some allowance has been made for the extra voltage increase that might occur (before activation of protection) due to earlier disconnection of parallel elements in a series group of elements (See B.1). If the application of capacitors leads to u 1and u 2value, other than those indicated, for example for filter capacitors or when
