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1、BRITISH STANDARD BS EN 60871-4:1997 IEC 871-4: 1996 Shunt capacitors for a.c. power systems having a rated voltage above 1 kV Part 4: Internal fuses The European Standard EN 60871-4:1996 has the status of a British Standard ICS 31.060.70 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:57:1
2、5 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60871-4:1997 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1997 BSI 12-1998 The following BSI referenc
3、es relate to the work on this standard: Committee reference PEL/33 Draft for comment 95/206259 DC ISBN 0 580 26935 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PEL/33, Power capacitors, upon which the following bodie
4、s were represented: Association of Consulting Engineers BEAMA Capacitor Manufacturers Association Electricity Association Microwave Association Rotating Electrical Machines Association (BEAMA Ltd.) Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, F
5、ri Nov 10 07:57:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60871-4:1997 BSI 12-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60871-43 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:57:15 G
6、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60871-4:1997 ii BSI 12-1998 National foreword This Part of BS EN 60871 has been prepared by Technical Committee PEL/33, and is the English language version of EN 60871-4:1996 Shunt capacitors for a.c. power systems having a rated voltage above 1 kV Par
7、t 4. Internal fuses, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 871-4:1996 published by the International Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Us
8、ers of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference Publication referred toCorresponding British Standard BS 7264 Shunt capacitors for a.c. power systems having a rated v
9、oltage above 1 000 V HD 525.1 S1:1989 (IEC 871-1:1987) Part 1:1990 Specification for performance, testing and use Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover. This standard has b
10、een updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:57:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE
11、NORM EN 60871-4 September 1996 ICS 29.120.50 Descriptors: Power capacitors, instrument shunts, alternating current, cutouts, performance evaluation, tests English version Shunt capacitors for a.c. power systems having a rated voltage above 1 kV Part 4: Internal fuses (IEC 871-4:1996) Condensateurs s
12、hunt pour rseaux courant alternatif de tension assigne suprieure 1 kV Partie 4: Fusibles internes (CEI 871-4:1996) Parallelkondensatoren fr Wechselspannungs-Starkstromanlagen mit einer Nennspannung ber 1 kV Teil 4: Eingebaute Sicherungen (IEC 871-4:1996) This European Standard was approved by CENELE
13、C on 1996-07-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards
14、 may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official 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
15、 to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Un
16、ited Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1996 Copyright reserved to CENELEC members Ref. No. EN 60871-4:1996
17、E Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:57:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60871-4:1996 BSI 12-1998 2 Foreword The text of document 33/222/FDIS, future edition 1 of IEC 871-4, prepared by IEC TC 33, Power capacitors, was submitted to the IEC-CENELEC parallel vote
18、 and was approved by CENELEC as EN 60871-4 on 1996-07-02. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, annexes A and ZA are normative and annex B is informative.
19、 Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 871-4:1996 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword2 1Scope and object3 2Normative reference3 3Definitions3 4Performance requirements3 4.1General3
20、 4.2Disconnecting requirements3 4.3Withstand requirements3 5Tests3 5.1Routine tests3 5.2Type tests4 5.3Disconnecting test on fuses4 Annex A (normative) Test procedures for the disconnecting test on internal fuses5 Annex B (informative) Guide for coordination of fuse protection6 Annex ZA (normative)
21、Normative references to international publications with their corresponding European publications7 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1997-05-01 latest date by which the national standards confli
22、cting with the EN have to be withdrawn(dow) 1997-05-01 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:57:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60871-4:1996 BSI 12-19983 1 Scope and object This part of IEC 871 applies to internal fuses which are designed to isolate faulty capaci
23、tor elements, 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 o
24、bject of this part of IEC 871 is to formulate requirements regarding performance and testing and to provide a guide for co-ordination of fuse protection. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this pa
25、rt of IEC 871. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 871 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated b
26、elow. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 871-1:1987, Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V Part 1: General Performance, testing and rating Safety requirements Guide for installation and operation. Amendment
27、 1 (1991) 3 Definitions For the purpose of this part of IEC 871, the definitions of IEC 871-1 apply. 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) becomes faulty. The range of currents and voltages for
28、 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 not restrike-free, other requirements shall be agr
29、eed between manufacturer and purchaser. The operation of an internal fuse is in general determined by one or both of the two following factors: the discharge energy from elements or units connected in parallel with the faulty element or unit; the power-frequency fault current. 4.2 Disconnecting requ
30、irements The fuse shall enable the faulty element to be disconnected when electrical breakdown of elements occurs in a voltage range, in which is the lowest, and is the highest (instantaneous) value of the voltage between the terminals of the unit at the instant of fault. The u1 and u2 values are ba
31、sed on the voltage that may normally occur across the capacitor unit terminals at the instant of electrical breakdown of the element. The u2 value is of a transient nature and allowance has been made for damping. If the purchaser specifies u1 and u2 values other than those indicated, for example for
32、 filter capacitors, the lower and upper test voltage limits shall be changed according to an agreement between manufacturer and purchaser. 4.3 Withstand requirements 4.3.1 After operation, the fuse assembly shall withstand full element voltage, plus any unbalance voltage due to fuse action, and any
33、short-time transient overvoltages normally experienced during the life of the capacitor. 4.3.2 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 pat
34、hs. 4.3.3 The fuses shall be capable of withstanding the inrush-currents due to the switching operations expected during the life of the capacitor. 4.3.4 The fuses connected to the undamaged elements shall be able to carry the discharge currents due to the breakdown of elements. 4.3.5 The fuses shal
35、l be able to carry the currents due to short-circuit faults on the bank external to the unit(s) occurring within the voltage range in accordance with 4.2. 5 Tests 5.1 Routine tests The fuses shall be able to withstand all routine tests of the capacitor unit in accordance with IEC 871-1. u10,9 =2UN u
36、22,0 = 2 UN Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:57:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60871-4:1996 4 BSI 12-1998 5.1.1 Discharge test Capacitors having internal fuses shall be subjected to one short-circuit discharge test, from a d.c. voltage of 1,7 UN through a g
37、ap 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 difference between the two measurements shall be less than an amount corresponding to one internal fuse operatio
38、n. The discharge test may be made before or after the voltage test between terminals (see IEC 871-1, clause 9). However, if it is made after the voltage test between terminals, a capacitance measurement at rated voltage shall be made afterwards to detect fuse operation. If, by agreement with the pur
39、chaser, capacitors are accepted with operated fuses, the voltage test between terminals (IEC 871-1, clause 9) shall be made after the discharge test. NOTEIt is permitted that d.c. charging voltage be generated by initially energizing with an a.c. voltage of 1,7 UN peak value and disconnecting at a c
40、urrent 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 discharge may be delayed until the discharge resistor reduces the voltage to 1,7 UN. 5.2 Type tests 5.2.1 The fuses shall be a
41、ble to withstand all type tests of the capacitor units in accordance with IEC 871-1 and IEC 871-2. The unit(s) shall have passed all routine tests stated in IEC 871-1. 5.2.2 The disconnecting test on fuses (see 5.3) shall be performed either on one complete capacitor unit or, at the choice of the ma
42、nufacturer, 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. NOTEDue to testing, measuring and safety circumstances, it may be necessary to make some modifications to the unit(s) under test; for example those indicated
43、 in annex A. See also the different test methods given in annex A. 5.2.3 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 capacitor(s) of a design that does not differ from it in any way that might affect the prop
44、erties 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 voltage limit of 0,9 UN and at the upper voltage limit of 2,2 UN. If the test is carried out with d.c., the test voltage shall be times the co
45、rresponding a.c. test voltage. 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 methods are indicated in annex A. 5.3.2 Capacitance measurement After the test, the capacitance
46、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 unit Before opening, no significant deformation of the container shall be apparent. After opening
47、the container, a check shall be made to ensure that: a) no significant deformation of sound fuses is apparent; b) no more than one additional fuse (or one-tenth of fused elements directly in parallel) has been damaged (see note 1 of clause A.1). If method b) given in annex A is used, note 1 of claus
48、e A.1 shall be observed. NOTE 1A small amount of blackening of the impregnant will not affect the quality of the capacitor. NOTE 2Dangerous trapped charges may be present on elements disconnected either by operated fuses or by damage to their connections. All elements should be discharged with great
49、 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 the 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. NOTEFor units with all elements in parallel and for all units if test procedure b), c), d