IEC_60056-1987_amd3-1996_scan.pdf

21NORMECEIINTERNATIONALEIECINTERNATIONAL56STANDARD1987AMENDEMENT 3AMENDMENT 31996-09Amendement 3Disjoncteurs a courant alternatifa haute tensionAmendment 3High-voltage alternating-currentcircuit-breakers CEI 1996 Droits de reproduction rservs-Copyright-all rights reservedBureau central de la Commission Electrotechnique Intenationale 3,rue de Varemb Geneve SuisseCommission Electrotechnique InternationaleCODE PRIXIECInternational Electrotechnical CommissionPRICE CODERMemAyHapoAHa neTpoTeXHecHaR HOMHCCHRPour prix,voir catalogue en vigueuFor price,see current catalogueIECVoL.256 Amend.3 IEC:1996-3-FOREWORDThis amendment has been prepared by subcommittee 17A:High-voltage switchgear andcontrolgear,of IEC technical committee 17:Switchgear and controlgear.This third amendment cancels and replaces the amendments 1(1992)and 2(1995).The text of this amendment is based on Amendment 1(1992),Amendment 2(1995)and on thefollowing documents:DISReport on voting17A/467/FDIS17A/480/RVDFull information on the voting for the approval of this third amendment can be found in thereport on voting indicated in the above table.Annexes JJ and KK are for information only.Page 5Add the following new subclause 8.104:8.104 Selection for electrical endurance in networks of rated voltage above 1 kV,and up to and including 52 kVAdd the new appendices JJ and KK to the contents as follows:Appendix JJ:Some remarks regarding multipliers for TRV values for second and third clearingpoles,of Table liFAnnex KK:Rationale behind introduction of circuit-breakers class BPage 17Add the following new subclauses:3.102.13 Circuit-breaker class AA circuit-breaker not falling into the category of class B as defined in 3.102.14.3.102.14 Circuit-breaker class BA circuit-breaker designed so as not to require maintenance of the interrupting parts of themain circuit during the expected operating life of the circuit-breaker,and only minimalmaintenance of its other parts.NOTES1 Minimal maintenance may include lubrication,replenishment of gas and cleaning of external surfaces,whereapplicable.2 This definition is restricted to circuit-breakers having a rated voltage up to and including 52 kV.Seeannex KK for rationale behind introduction of class B.56 Amend.3 IEC:1996-5-Page 434.101.2 D.C.component of the rated short-circuit breaking currentReplace the first line of the note on page 45 by the following:NOTE-Depending on the characteristics of the system,for example if a circuit-breaker is close to a generator,the percentage ponent.Page 51Introduce a new table llF 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 testingFirst-Multiplierspole-to-clearfactor2nd clearing pole3rd clearing poleRRRVucRRRVuc1.50,700,580.700.58130,950,980.700.77RRRV:Rate-of-rise of recovery voltage.In order to obtain the values of RRRV and uc for the second and third clearing poles,themultiplier shall be applied to the values of RRRV and uc of the first clearing pole at the relevantfirst-pole-to-clear factor.The RRRV-multipliers are related to u1/t1;the times t and t2 are the same for the first,secondand 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 be appliedas indicated in IEC 427 for the first clearing pole.The figures are an approximation for test duties 1,2 and 3 andare subject to further consideration.4 The values are rounded values,depending on Z/Z,of the TRV-circults,the time constant of the system andthe rated voltages.5 Values of table IIF for 1,5 first-pole-to-clear factor are only valid to breakers having less than one-quarter ofa cycle difference in pole simultaneity.Page 1056 Type testsAmend the text of the second dash as follows:-short-circuit current making and breaking tests including,where applicable,terminal faulttests,short-line fault tests,electrical endurance tests,and also out-of-phase tests(see6.102 to 6.110.5).Page 1096.1.7 Power-frequency voltage testsThe two notes of 6.1.7 shall be numbered:NOTE 1-In the case of dead tank circuit-breakers,.NOTE 2-For special applications,.Page 1156.101.1.3 Condition of the circuit-breaker during and after the testsAdd a sixth indent on page 117:-after the tests the insulating properties of the circuit-breaker in the open position shall bein essentially the same condition as before the tests.Visual inspection of the circuit-breakerafter the tests is usually sufficient for verification of the insulating properties.In case ofdoubt,the condition checking test according to 6.1.11 of IEC 694 is deemed sufficient toprove the insulating properties.For circuit-breakers with sealed-for-life interrupters thecondition checking test is mandatory.Page 1176.101.2.1 GeneralDelete,on page 119,the last paragraph.Page 119Add,after subclause 6.101.2.3,the following new subclause 6.101.2.4:6.101.2.4 Extended mechanical endurance tests on circuit-breakers forspecial service requirementsFor special service requirements in the case of frequently operated circuit-breakers,extendedmechanical endurance tests may be carried out,as follows:a)The tests shall consist of 10 000 operating cycles comprising five times the relevant testBetween the test series,some maintenance,such as lubrication and mechanicalseries specified in table XIl.adjustment,is allowed,and shall be performed in accordance with the manufacturersinstructions.Change of contacts is not permitted.56 Amen.3C.The programme of maintenance during the tests shall be defined by the manufacturerbefore the tests and recorded in the test report.b)Before and after the total test programme,the following operations shall be performed:-five close-open operating cycles at the rated supply voltage and/or pressure;-five close-open operating cycles at the minimum supply voltage and/or pressure;-five close-open operating cycles at the maximum supply voltage and/or pressure;-five close-open manual operations.During these operating cycles,operating characteristics(see 6.101.1.2)shall be recorded orevaluated,if applicable.It is not necessary to publish all the oscillogrammes recorded.In addition,the following checks and measurements shall be performed(see appendix HH):-measurements of characteristic operating fluid pressures and of consumption duringoperations,if applicable;-verification of the rated operating sequence;-checks of certain specific operations,if applicable.The variation between the mean values of each parameter measured before and after theextended mechanical endurance tests shall be within the tolerance given by themanufacturer.c)After each series of 2 000 operating cycles or at maintenance intervals,some significantoperating characteristics selected in subclause 6.101.1.2 should be recorded or evaluated.d)After the total test programme the condition of the circuit-breaker shall be in accordancewith subclause 6.101.1.3.Page 1216.101.3.3 Low temperature testAmend Item b),on page 123,as follows:b)Characteristics and settings of the circuit-breaker shall be recorded in accordance with6.101.1.2 and at an ambient air temperature of(20 5)C(TA).The tightness test(ifapplicable)shall be performed according to EE1.4 of appendix EE.Amend Item f)as follows:af)The low temperature behaviour of the circuit-breaker and its alarms and lock-out systemsilshall be verified by disconnecting the supply of heating devices for a duration fy.During thisinterval,occurrence of the alarm is acceptable but lock-out is not.At the end of the intervaltx,an opening order,at rated values of supply voltage and operating pressure,shall begiven.The circuit-breaker shall then open.The opening time shall be recorded(and thecontact velocity measured,if feasible)to allow assessment of the interrupting capability.ie3sThe manufacturer shall state the value of t up to which the circuit-breaker is still operabledewithout auxiliary power to the heaters.In the absence of such a statement,this value shallrebe equal to 2 h.derereestte