1、BSI Standards PublicationShunt capacitors for AC powersystems having a rated voltageabove 1 000 VPart 4: Internal fusesBS EN 60871-4:2014National forewordThis British Standard is the UK implementation of EN 60871-4:2014. It is identical to IEC 60871-4:2014. It supersedes BS EN 60871-4:1997 which is
2、withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PEL/33, Power capacitors.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. User
3、s are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 79035 5ICS 29.240.99; 31.060.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the aut
4、hority of theStandards Policy and Strategy Committee on 31 July 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60871-4:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60871-4 July 2014 ICS 29.240.99; 31.060.70 Supersedes EN 60871-4:1996 English Ve
5、rsion Shunt capacitors for AC power systems having a rated voltage above 1 000 V - Part 4: Internal fuses (IEC 60871-4:2014) Condensateurs shunt pour rseaux courant alternatif de tension assigne suprieure 1 000 V - Partie 4: Fusibles internes (CEI 60871-4:2014) Parallelkondensatoren fr Wechselspannu
6、ngs-Starkstromanlagen mit einer Bemessungsspannung ber 1 000 V - Teil 4: Eingebaute Sicherungen (IEC 60871-4:2014) This European Standard was approved by CENELEC on 2014-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
7、s European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three offici
8、al versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechni
9、cal 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 Netherlands, Norway, Poland, Portugal, Romania, Sl
10、ovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014
11、CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60871-4:2014 E BS EN 60871-4:2014EN 60871-4:2014 - 2 - Foreword The text of document 33/548/FDIS, future edition 2 of IEC 60871-4, prepared by IEC/TC 33, “Power capacitors and their ap
12、plications“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60871-4:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-02-01 latest d
13、ate by which the national standards conflicting with the document have to be withdrawn (dow) 2017-05-01 This document supersedes EN 60871-4:1996. Attention 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
14、 responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60871-4:2014 was approved by CENELEC as a European Standard without any modification. BS EN 60871-4:2014- 3 - EN 60871-4:2014 Annex ZA (normative) Normative references to interna
15、tional publications with their corresponding European publications 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 of
16、the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is avail
17、able here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60871-1 2005 Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V - Part 1: General EN 60871-1 2005 BS EN 60871-4:2014 2 IEC 60871-4:2014 IEC 2014 CONTENTS 1 Scope and object . 5 2 Normative references 5 3 Terms
18、 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 test . 7 5.2 Type tests . 7 5.3 Disconnecting test on fuses 7 5.3.1 Test procedures . 7 5.3.2 Capacitance
19、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 . 9 A.2 Test procedures 9 Annex B (informative) Guide for coordination of fuse protection . 11 B.1 Genera
20、l . 11 B.2 Protection sequence . 11 BS EN 60871-4:2014IEC 60871-4:2014 IEC 2014 5 SHUNT CAPACITORS 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 eleme
21、nts, in order to allow operation of the remaining parts of that capacitor unit and the bank in which 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
22、this part of IEC 60871 is to formulate requirements regarding performance and testing and to provide 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
23、. For dated references, only the edition cited applies. For undated references, the latest edition 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
24、the purpose of this part of IEC 60871, the terms and definitions in IEC 60871-1, as well as the following, apply. 3.1 rated voltage of a capacitor element UNer.m.s. value of the alternating voltage for which the capacitor element has been designed 4 Performance requirements 4.1 General The fuse is c
25、onnected in series to the element(s) which the fuse is intended to isolate if the element(s) becomes 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 f
26、or a bank or a capacitor switched by restrike-free circuit-breakers. If the circuit-breakers are 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: BS EN 608
27、71-4:2014 6 IEC 60871-4:2014 IEC 2014 the discharge energy from elements or units connected in parallel with the faulty 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 Disc
28、onnecting requirements The fuse shall enable the faulty element to be disconnected when electrical breakdown of elements occurs in a voltage range, in which Ne120,9 Uu = is the lowest, and Ne222,5 Uu = is the highest (instantaneous) value of the element voltage at the instant of fault. The range u1t
29、o u2is based on the voltage that might occur across the capacitor element at the instant of electrical breakdown. The u2value 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 prote
30、ction) due to earlier disconnection of parallel elements in a series group of elements (See B.1). If the application of capacitors leads to u1and u2value, other than those indicated, for example for filter capacitors or when the protection settings limit the value of overvoltage, the lower and upper
31、 test voltage limits shall be changed according to an agreement between manufacturer and purchaser. 4.3 Withstand requirements After operation, the fuse assembly shall withstand full element voltage, plus any unbalance voltage due to fuse action, and any short-time transient overvoltages normally ex
32、perienced during the life of the capacitor. Throughout the life of the capacitor, the fuses shall be capable of carrying continuously a current equal to or greater than the maximum permissible unit current divided by the number of parallel fused paths. The fuses shall be capable of withstanding the
33、inrush-currents due to the switching operations expected during the life of the capacitor. The fuses connected to the undamaged elements shall be able to carry the discharge currents due to the breakdown of elements. The fuses shall be able to carry the currents due to short-circuit faults on the ba
34、nk external to the unit(s) occurring at a peak voltage of 2,5 UN .5 Tests 5.1 Routine tests 5.1.1 General The fuses shall be able to withstand all routine tests of the capacitor unit in accordance with IEC 60871-1. BS EN 60871-4:2014IEC 60871-4:2014 IEC 2014 7 5.1.2 Discharge test Capacitors having
35、internal fuses shall be subjected to one short-circuit discharge test, from a d.c. voltage of 1,7 UNthrough a gap situated as closely as possible to the capacitor, without any additional impedance in the circuit (see note). The capacitance shall be measured before and after the discharge test. The d
36、ifference between the two measurements shall be less than an amount corresponding to one internal fuse operation. The discharge test may be made before or after the voltage test between terminals (see IEC 60871-1:2005, Clause 9). However, if it is made after the voltage test between terminals, a cap
37、acitance measurement at rated voltage shall be made afterwards to detect fuse operation. If, by agreement with the purchaser, capacitors are accepted with operated fuses, the voltage test between terminals (IEC 60871-1:2005, Clause 9) shall be made after the discharge test. It is permitted that d.c.
38、 charging voltage be generated by initially energizing with an a.c. voltage of 1,7 UN peak value and disconnecting at a current zero. The capacitor is then immediately discharged from this peak value. Alternatively, if the capacitor is disconnected at a slightly higher voltage than 1,7 UN, the disch
39、arge may be delayed until the discharge resistor reduces the voltage to 1,7 UN. 5.2 Type tests The fuses shall be able to withstand all type tests of the capacitor units in accordance with IEC 60871-1. The unit(s) shall have passed all routine tests stated in IEC 60871-1. A disconnecting test on fus
40、es (see 5.3) shall be performed either on one complete capacitor unit or, at the choice of the manufacturer, on two units, one unit being tested at the lower voltage limit, and one unit at the upper voltage limit, in accordance with 5.3.1. Due to testing, measuring and safety circumstances, it may b
41、e necessary to make some modifications to the unit(s) under test; for example those indicated in annex A. See also the different test methods given in Annex A. Type tests are considered valid if they are performed on capacitor(s) of a design identical with that of the capacitor offered, or on a capa
42、citor(s) of a design that does not differ from it in any way that might affect the properties to be checked by the type tests. 5.3 Disconnecting test on fuses 5.3.1 Test procedures The disconnecting test on fuses shall be performed at the lower a.c. element voltage limit of 0,9 UNeand at the upper v
43、oltage limit of 2,5 UNeor other values according to an agreement between manufacturer and purchaser If the test is carried out with d.c., the test voltage shall be 2 times the corresponding a.c. test voltage. NOTE Normally the dielectric would only withstand an a.c. voltage of 2.5 UNfor a very limit
44、ed period of time. Therefore a test with d.c. is in most cases to be preferred. BS EN 60871-4:2014 8 IEC 60871-4:2014 IEC 2014 If the test is carried out with a.c., the triggering of the element failure with a voltage peak shall not be necessary for the test at the lower voltage limit. Certain test
45、methods are indicated in Annex A. 5.3.2 Capacitance measurement After the test, the capacitance shall be measured to prove that the fuses have blown. A measuring method shall be used that is sufficiently sensitive to detect the capacitance change caused by one blown fuse. 5.3.3 Inspection of the uni
46、t Before opening, no significant deformation of the container shall be apparent. After opening the container, a check shall be made to ensure that: a) no severe deformation of sound fuses is apparent; b) no more than one additional fuse (or one-tenth of fused elements directly in parallel) has been
47、damaged (see note 1 to Clause A.1). If method b) given in Annex A is used, note 1 to Clause A.1 shall be observed. NOTE A small amount of blackening of the impregnant will not affect the quality of the capacitor. It should be noted that dangerous trapped charges may be present on elements disconnect
48、ed either by operated fuses or by damage to their connections. All elements should be discharged with great care. 5.3.4 Voltage test after opening the container A voltage test shall be carried out by applying a d.c. voltage of 3,5 UNe(UNeelement voltage) for 10 s across the broken down element and t
49、he gap in its blown fuse. The element and the fuse should not be removed from the unit for this test. During the test, the gap shall be in the impregnant. No breakdown over the fuse gap or between any part of the fuse and any other part of the unit is allowed. NOTE For units with all elements in parallel, or in all other cases if test procedure b), c), d), or e) indicated in Annex A is used, this test can be replaced by an a.c. test before the opening of the unit. The test voltage between the terminals is calcu
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