1、CENELEC EN*hO*933-2 96 3404583 0379379 340 BRITISH STANDARD Shunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up to and including 1 kV Part 2. Ageing test and destruction test The European Standard EN 60931-2 : 1996 has the status of a British Standard ICs 3
2、1.060.70 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT T.AW BS EN 60931-2 : 1996 IEC 931-2 : 1995 CENELEC EN*bO*93L-2 96 M 3404583 0379380 062 W BS EN 60931-2 : 1996 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was publish
3、ed under the authority of the Standards Board and comes into effect on 15 September 1996 O BSI 1996 First published March 1994 Second edition September 1996 The following BSI references relate to the work on this standard Committee reference PEU33 Draft for (:omment 95/210545 DC ISBN O 580 26164 6 C
4、ommittees responsible for this British Standard The prepasation of this British Standard was entrusted to Technical Committee PELr33, Power capacitors, upon which the following bodies were represented Association of Consulting Engineers BEAMA Capacitor Manufacturers? Association Electricity Associat
5、ion Microwave Association Rotating Electrical Machines Association (BEAMA Ltd.) Amendments issued since publication Amd.No. Date I Text affected - BS EN 60931-2 : 1996 Contents Committees responsible National foreword page Inside front cover ii Foreword Text of EN 60931-2 2 3 * * Cn O BSI 1996 i CEN
6、ELEC EN*bO*93L-2 9b 3404583 0379382 935 BS EN 60931-2 : 1996 National foreword This British Standard has been prepared by Technical Committee PEy33 and is the English language version of EN 60931-2 : 1996 Shunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up
7、to and including 1 kV Part 2: Ageing test and destruction test, published by the European Committee for Electrokchnical Standardization (CENELEC). It is identical with IEC 931-2 : 1995 published by the International Electrotechnical Commission (IEC). The foreword of the EN makes reference to the dat
8、e of withdrawd, dow, of the relevant national standard. in this case the relevant national standard is BS EN 60931-2 : 1994 which will be withdrawn on 1996-12-01. Certificates and marks will not be awarded after this date with respect to the withdrawn British Standard. However such certificates and
9、marks, already awarded, may continue to apply to production until 2001-12-01. Cross-references Publication referred to IEC 593 : 1977 EN 60931-1 : 1993 (IEC 931-1 : 1989) Corresponding British Standard BS 7631 : 1993 Intemal fuses and intemal ovquressure d2sconnectors for shunt capacitors BS EN 6093
10、1 Shunt power capacitors of the non-self-heding type for a.c. systems having a rated voltage up to and including 1000 V Part 1 : 1994 Geneml. Pcorrnunce, testing and rating. Safetg requirements. Guide for installation and operation Compliance with a British Standard does not of itself confer immunit
11、y from legal obligations. O BSI 1996 CENELEC EN*b0*933-2 76 = 3404583 0377383 871 * cn * EUROPEAN ARD NORME EUROPENNE EUROP - discharging the capacitor through an inductance of: L=- Oo f20 Yo in microhenrys (pH) C in which C is the measured capacitance in microfarads (pF) The cables used for the ext
12、ernal circuit and the inductance shall have a cross-section appropriate to the maximum permissible current (see IEC 931-1. clause 21). The duration of each cycle shall be 30 s minimum. c) Repetition of item a). During the whole test sequence the temperature of the case shall be maintained equal to t
13、hat indicated in 17.1. In the case of three-phase capacitors, the first and the third parts of the test sequence (items a) and c) shall be carried out with all the phases energized at 1,25 UN. This can be obtained either by using a three-phase source, or by using a monophase source and modifying the
14、 internal capacitor connections. The second part (item b) of the test sequence, however, shall be carried out on two phases only. In the case of a star connection, modification of the internal connections are necessary or the charging voltage shall be increased from 2 UN up to 2.31 UN. 17.3 Test req
15、uirements During the test no permanent breakdown, interruption or flashover shall occur. At the end of the test the capacitor shall cool down freely to the ambient temperature and the capacitance shall then be measured under the same conditions as before the test. The maximum permitted variation of
16、capacitance compared to the values measured before the test shall be 3 Yo averaged over all the phases and 5 % on one phase. The voltage test between terminals and container shall be carried out with the same proce- dures as prescribed in 10.1 of IEC 931 -1. The sealing test shall be repeated as pre
17、scribed in clause 12 of IEC 931-1 18 Self-healing test Not applicable. 19 Destructlon test This test is performed to evaluate the behaviour of the capacitor at the end of its life. - CENELEC EN*h0*931-2 96 3404583 0179388 353 = Page 6 EN 60931-2 : 1996 If the capacitor is protected by internal fuses
18、, these fuses shall comply with IEC 593. If no internal fuses are provided, the destruction test shall be carried out according to the following procedure. 19.1 Test sequence The test shall be carried out on a capacitor unit. If necessary the discharge resistors shall be disconnected in order to avo
19、id burning. A capacitor which has passed the ageing test may be used. For polyphase units the test shall be carried out between two terminals only. in the case of three-phase delta connection two terminals shall be short-circuited. For star connection no terminals shall be short-circuited. * The pri
20、nciple of the test is to promote failure in the elements by d.c. voltage and sub- sequently to check the behaviour of the capacitor when an a.c. voltage is applied. The capacitor shall be mounted in a circulating air oven having a temperature equal to the maximum ambient air temperature of the tempe
21、rature category of the capacitor. When all the parts of the capacitor have reached the temperature of the oven the following test sequence shall be performed with the circuit given in figure 1. a) With the selector switches H and K in position 1 and a respectively, the a.c. voltage source is set to
22、1,3 U, and the capacitor current is recorded. b) The d.c. source is set to 10 U,. The switch H is then set to position 2 and the variable resistor is adjusted to give a d.c. short-circuit current of 300 mA. c) Switch H is set to position 3 and switch K to position b in order to apply the d.c. test v
23、oltage to the capacitor which is maintained until the voltmeter indicates approximately zero for 3 s to 5 s. d) Switch K is then set to position a again in order to apply the a.c. test voltage to the capacitor for a period of 3 min when the current is again noted. The following conditions may be obt
24、ained: - the ammeter I and the voltmeter U both indicate zero. In this case the fuse shall be checked. If it has blown it shall be replaced. Then the a.c. voltage is applied to the capacitor and if the fuse blows again the procedure is interrupted. If the fuse does not blow. the procedure consisting
25、 in the application to the capacitor of d.c. and a.c. voltage as prescribed in items c) and d) continues using only the switch K; CENELEC EN*b*931-2 96 I 3404583 0179389 29T I Page 7 EN 60931-2 : 1996 - the current indicated by the ammeter I is lower than 66 % of the initial value and the voltmeter
26、U indicates 1,3 U,. In this case the procedure is interrupted; - the current indicated by the ammeter I is higher than 66 % of the initial value. In this case the procedure (d.c. - a.c.) continues. When the procedure is interrupted the capacitor is cooled to the ambient temperature, and the voltage
27、test between terminals and container is carried out according to 10.1 of IEC 931-1 applying an a.c. voltage of 1 500 V. 3 I i 1 I I - a Figure 1 - Circuit to perform the destruction test i“ 9Um The minimum short-circuit current of the a.c. generator shall be 2 O00 A at the capacitor terminals. A tim
28、e-lag fuse complying with IEC 241 shall be used. The rated current IF of the fuse shall be obtained by the formula: IF = KI f 10 % in amperes (A) where: K= 100 o ON in kilovars (kvar), in the case of a single-phase capacitor; O = O = 213 ON in kilovars (kvar). in the case of a three-phase delta-conn
29、ected capacitor with two terminals connected together or three-phase star-connected capacitor with two terminals connected only. (This because the testing voltage has to be adjusted as per additional note when performing the test; see following note.); IN in amperes (A), in the case of a single-phas
30、e or star-connected three-phase capacitor; I = I = 2/-6(=1.155) IN in amperes (A), in the case of a three-phase delta-connected capacitor with two terminals connected together. CENELEC EN*b0*933-2 96 3404583 0379390 TO1 Page 8 EN 60931-2 : 1996 In any case, K shall be not less than two and not great
31、er than ten. NOTE - For three-phase star-connected capacitors, the single-phase test voltage applied to any two terminals is adjusted by a single factor of 2/6. For a test voltage level of 1.3 U, the adjusted voltage in this case will be 2/6 x 1.3 U, (about 1,5 U,). i 9.2 Test requirements At the co
32、nclusion of the test the enclosure of each capacitor shall be intact except that normal operation of a vent, or minor damage of a case (e.g. cracks) is permitted provided the following conditions are met. a) Escaping liquid material may wet the outer surface of the capacitor but shall not fall in dr
33、ops. b) The container of the capacitor may be deformed and damaged but not broken. c) Flames and/or fiery particles shall not be emitted from the openings. This may be checked by enclosing the capacitor in gauze (cheesecloth). Burning or scorching of the gauze is then considered to be a criterion of
34、 failure. d) The result of a dielectric test between terminals and container with 1 500 V for 10 s shall be satisfactory. NOTE - Excessive emanation of fumes during the test could be dangerous. - CENELEC EN*b0*931-2 96 3404583 0379393 948 Page 9 EN 60931-2 : 1996 Annex ZA (normative) Normative refer
35、ences to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, proVisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereaft
36、er. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard oniy when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTE. When the
37、international publication has been modified by common modifications, indicated by (mod), the relevant ENMD applies. IEC publication Year IEC 241 1968 IEC 593 1977 IEC 931-1 1989 (mod) Title EN/HD Fuses fx- domestk and similar purposes Intemal fuses and interrd overpr.essur-e disconnectors for shunt
38、capacitors Shunt power capacitors of Uze m-self-heding type for a.c. systems having a rated voltage up to and including 1 kV Part 1: Geneml - Peomnce, testing and rating - Safety requirements Gui Fax: O181 996 7400. BSI offers members an individual updating service called PLUS which ensures that sub
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