1、6ml(9)5ReserveNORMECEIINTERNATIONALEIECINTERNATIONAL56STANDARD1987AMENDEMENT 2AMENDMENT 21995-03Amendement 2Disjoncteurs a courant alternatifa haute tensionAmendment 2High-voltage alternating-currentcircuit-breakers33.62539 CEI 1995-Droits de reproduction rservs-Copyright-all rights reservedBureau C
2、entral de la Commission Electrotechnique Intemationale 3,rue de Varemb Geneve,SuisseCommission Electrotechnique InternationaleCODE PRIXIECInternational Electrotechnical CommissionPRICE CODEEMemyHapoHa nexTpoTexHHecHaR HOMHCCHRPour prix,voir catalogue en vigueurFor price,see curent catalogueIECVOL.25
3、6 Amend.2 IEC:1995-3-FOREWORDThis amendment has been prepared by sub-committee 17A:High-voltage switchgear andcontrolgear,of IEC technical committee 17:Switchgear and controlgear.The text of this amendment is based on the following documents:DISReport on voting17A(CO)24917A/441/RVDFull information o
4、n the voting for the approval of this amendment can be found in thereport on voting indicated in the above table.Page 5Add the new appendix JJ to the contents as follows:Appendix JJ:Some remarks regarding multipliers for TRV values for second and thirdclearing poles,of Table IIFPage 51Introduce a ne
5、w table IIF as follows:Table IIF-Multipliers for transient recovery voltage values for second andthird clearing poles for rated voltages above 72,5 kV,to be appliedat three-phase testingMultipliersFirst-pole-to-clear2nd clearing pole3rd clearing polefactorRRRVRRRVuc1.50.700,580.700.581,30.950,980.70
6、0.77RRRV:Rate-of-rise of recovery voltage.JrIn order to obtain the values of RRRV and u,for the second and third clearing poles,theiumultiplier shall be applied to the values of RRRV and u_ of the first clearing pole at therelevant first-pole-to-clear factor.56 Amend.2 IEC:1995-5The RRRV-multipliers
7、 are related to u,/t,;the times t,and 2 are the same for the first,second and last clearing poles.NOTES1 For rated voltage for 72,5 kV and below,the values are under consideration.2 See also appendix JJ.3 This table is valid for test duty 1,2,3,4 and 5.For test duty 5 the same reduction method shall
8、 beapplied as indicated in IEC 427 for the first clearing pole.The figures are an approximation for test duties1,2 and 3 and are subject to further consideration.4 The values are rounded values,depending on Z/Z,of the TRV-circuits,the time constant of thesystem and the rated voltages.5 Values of tab
9、le IIF for 1,5 first-pole-to-clear factor are only valid to breakers having less thanone-quarter of a cycle difference in pole simultaneity.Page 1336.102.2 Arrangement of circuit-breaker for testsReplace the text of 6.102.2 a)by:a)Single-enclosure typeA three-pole circuit-breaker having all its arci
10、ng contacts supported within a commonenclosure shall be tested in line with IEC 1633.Page 1356.102.2 b)Multi-enclosure typeAdd after rigidity of structure a new paragraph as follows:Metal enclosed and dead tank circuit-breakers shall be tested in accordance withIEC 1633.Pages 236 and 237Figures 19 a
11、nd 20Change figures 19 and 20 by removing the squares representing TRV-networks bycombinations of capacitances and resistances.56 Amend.2 IEC:1995-7-Page 331Add a new appendix JJ as follows:Appendix JJSome remarks regarding multipliersfor TRV values for second and third clearing poles,of table IIFTh
12、e TRV values for the 2nd and 3rd clearing poles are given in table IIF,for the first-pole-to-clear factor 1,3 and 1,5,by multipliers related to the TRV values of the first clearingpoles.The multipliers for rated voltage of 72,5 kV and below are under consideration.Thefollowing conditions were assume
13、d.-Only three-phase earthed faults are considered.-The rate of rise of recovery voltage(RRRV)at 100%short-circuit currents is mainlydetermined by overhead lines and can be calculated as the product of dildt at currentzero and the equivalent surge impedance.-The equivalent surge impedance is calculat
14、ed from the zero(Z)and positivesequence(Z,)surge impedances seen from the terminals of the circuit-breaker.For therelation of Zo/Z,a value of approximately 2,0 has been chosen.-The peak value of TRV(u_)is proportional to the instantaneous value of power-frequency recovery voltage at interruption.See also figures JJ1 and JJ2.56 Amend.2 IEC:1995-9-ZNCEI-IEC 132/95for Z01Z1=2:pour Z0Z1=2:ZN=1/3Z1ZN=13Z1Figure JJ2-Representation quivalente a la figure JJ1Alternative representation of figure JJ1