1、ReservNORMECEIINTERNATIONALEIECINTERNATIONAL56STANDARD1987AMENDEMENT1AMENDMENT11992-1123n.W.2536Amendement 1Disjoncteurs a courant alternatifa haute tensionAmendment 1High-voltage alternating-currentcircuit-breakers CEI 1992 Droits de reproduction rservs-Copyright-all rights reservedBureau Central d
2、e la Commission Electrotechnique Intemationale 3,rue de Varemb Geneve,SuissCODE PRIXCommission Electrotechnique InternationalePRICE CODEInternational Electrotechnical CommissionMeNAyHapoAHaR neKTpoTeXHMHecHaR HOMHCCHRPour prix,voir catalogue an vigueFor price,see current catalogueIECVoL.256 Amend.1
3、IEC-3-FOREWORDThis amendment has been prepared by Sub-Committee 17A:High-voltage switchgear andcontrolgear,of IEC Technical Committee No.17:Switchgear and controlgear.The text of this amendment is based on the following documents:DISReport on Voting17A(CO)19917A(CO)20517A(CO)20817A(CO)21017A(CO)2231
4、7A(CO)23117A(CO)22417A(CO)23217A(CO)22617A(CO)23617A(CO)22717A(CO)23717A(CO)23517A(CO)243Full information on the voting for the approval of this amendment can be found in theVoting Reports indicated in the above table.Page 434.101.2 D.C.component of the rated short-circuit breaking currentReplace th
5、e 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 agenerator,the percentage ponent.Page 1056.Type tests2Replace the brackets with the text(see subclauses 6.103 to 6.110)of the second dash by:(see subc
6、lauses 6.102 to 6.110).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,.56 Amend.1 IEC-5-Page 1156.101.1.3 Condition of the circuit-breaker during and after the testsAdd a sixth inde
7、nt on page 117:-after the tests the insulating properties of the circuit-breaker in the open positionshall be in essentially the same condition as before the tests.Visual inspection ofthe circuit-breaker after the tests is usually sufficient for verification of the insulatingproperties.In case of do
8、ubt,the condition checking test according to 6.1.11 of IEC 694is deemed sufficient to prove the insulating properties.For circuit-breakers with sealed-for-life interrupters the condition checking test is mandatory.Page 1216.101.3.3 Low temperature testAmend Item b),on page 123,as follows:b)Character
9、istics and settings of the circuit-breaker shall be recorded in accordancewith 6.101.1.2 and at an ambient air temperature of(20 5)C(TA).The tightness test(if applicable)shall be performed according to EE1.4 of appendix EE.Amend Item f)as follows:f)The low temperature behaviour of the circuit-breake
10、r and its alarms and lock-outsystems shall be verified by disconnecting the supply of heating devices for a durationt_.During this interval,occurrence of the alarm is acceptable but lock-out is not.At theend of the interval t,an opening order,at rated values of supply voltage and operatingpressure,s
11、hall be given.The circuit-breaker shall then open.The opening time shall berecorded(and the contact velocity measured,if feasible)to allow assessment of theinterrupting capability.The manufacturer shall state the value of t,up to which the circuit-breaker is still oper-able without auxiliary power t
12、o the heaters.In the absence of such a statement,thisvalue shall be equal to 2 h.Add after Item k),on page 125,a new paragraph as follows:The accumulated leakage during the complete low temperature test sequence from Item b)to Item k)shall not be such that lock-out pressure is reached without gas-re
13、plenishmentit(whereas reaching alarm pressure is allowed).Page 1256.101.3.4 High temperature testAmend Item m)as follows:aaim)Characteristics and settings of the circuit-breaker shall be recorded in accordancewith 6.101.1.2 and at an ambient air temperature of(20 5)C(T).The tightness test(if applica
14、ble)shall be performed according to EE1.4 of Appendix EE.56 Amend.1 IEC-7-Add after Item u),on page 127,a new paragraph as follows:The accumulated leakage during the complete high temperature test sequence from Itemm)to Item u)shall not be such that lock-out pressure is reached without gas-replenish
15、ment(whereas reaching alarm pressure is allowed).Page 1416.102.4 Synthetic testsReplace the existing text by the following:Synthetic testing methods can be applied for making and breaking tests as required in6.106 to 6.111.Synthetic testing techniques and methods are described in IEC 427.Page 1456.1
16、02.8.1GeneralReplace the text by the following:The circuit-breaker may be inspected after any test duty.Its mechanical parts and insu-lators shall be in essentially the same condition as before the test duty.Visual inspectionis usually sufficient for verification of the insulating properties.In case
17、 of doubt,the condi-tion checking test according to 6.1.11 of IEC 694 is deemed sufficient to prove the insula-ting properties.For circuit-breakers with sealed-for-life interrupters and when thedemounting affects the inspection result,as may be the case for certain GIS breakers,thecondition checking
18、 test is mandatory.Page 1476.102.9 Circuit-breakers with short arcing timesAmend the first two paragraphs as follows:-It is recognized that,when breaking tests are made on circuit-breakers having short arcingetimes,there may be great variation in actual severity of tests with the same circuit settin
19、g.edue to the point on the current wave at which contact separation occurs.For this reason,the testing procedure for circuit-breakers with arcing times(to the extinction of the mainesarc for circuit-breakers with switching resistors)not exceeding one cycle for the first poleS-to clear is given below
20、 under Items(A)and(B).e,The tests under Items(A)2)and(B)2)consist of three valid breaking operations inde-espendent of the rated operating sequence.After the number of operations provided for intreaccordance with the rated operating sequence the circuit-breaker may be reconditionedin accordance with
21、 6.102.8.5.arcNOTE-The same test procedure may be applied also for circuit-breakers having longer arcing times thanone cycle.56 Amend.1IEC-9(A)Three-phase testsThe text remains unchanged.(B)Single-phase testsAmend Item(B)as follows:The aim of the following single-phase tests is to satisfy the condit
22、ions of the first-pole-to-clear and the last-pole-to-clear for each test duty in one test circuit.1)Single-phase tests in substitution for three-phase conditions in an isolated neutralsystem.Test-duties Nos.1,2,3,4 and 4b(6.106.1.to 6.106.4)The first valid breaking operation shall demonstrate the fi
23、rst possible clearance aftercontact separation.This is obtained when any extra delay in the separation of thecontacts with respect to a zero passage of the current causes the breaking to occur atthe next zero passage of the current.NOTE The resultant arcing time has been termed the minimum arcing ti
24、me.For the second breaking operation,the setting of the control of the tripping impulseshall be approximately 60 electrical degrees earlier than that of the first valid breakingoperation.The resultant clearance should occur at the same current zero as the firstvalid breaking operation.The control of
25、 the tripping impulse for the third breaking operation shall be earlier thanthat of the second breaking operation by further(90 electrical degrees-dt)where dt isless than 18 electrical degrees.2)Single-phase tests in substitution for three-phase conditions in an earthed neutralsystem and short-line
26、fault tests.Test-duties Nos.1,2,3,4 and 4b and short-line fault tests(6.106.1 to 6.106.4,6.108and6.109.5).The first valid breaking operation shall demonstrate the first possible clearance aftercontact separation.This is obtained when any extra delay in the separation of thecontacts with respect to a
27、 zero passage of the current causes the breaking to occur atthe next zero passage of the current.NOTE The resultant arcing time has been termed the minimum arcing time.For the second breaking operation,the setting of the control of the tripping impulseshall be earlier than that of the first operatio
28、n by(180 electrical degrees-dt)where dtis less than 18 electrical degrees.For the third breaking operation,the setting of the control of the tripping impulse shallbe 90 electrical degrees earlier than that of the first valid breaking operation.The sequence for performing the three valid operations is not specified.eBoth conditions 1)and 2)may be demonstrated by combining the above in one test series.The transient and power frequency recovery voltages to be used shall be those applicableto the isolated neutral system and the arcing times shall be those applicable to the earthedneutral system.
