远距离输电线路等传变瞬时值差动保护

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1、第28期文明浩等：　远距离输电线路等传变瞬时值差动保护65文章编号：0258-8013(2007)07-0000-05中图分类号：TM77文献标识码：A学科分类号：470×10远距离输电线路等传变瞬时值差动保护文明浩，陈德树，尹项根，张哲（华中科技大学电力安全与高效湖北省重点实验室，湖北省武汉市430074）LongTransmissionLineCurrentDifferentialProtectionbyUsingInstantaneousValueafterEqualTransferProcessesWENMing-hao

2、,CHENDe-shu,YINXiang-gen,ZHANGZhe(ElectricPowerSecurityandHighEfficiencyLab,HuazhongUniversityofScienceandTechnology,Wuhan430074,HubeiProvince,China)第28期文明浩等：　远距离输电线路等传变瞬时值差动保护65ABSTRACT:Itisrevealedthattheinteractionbetweentransientvoltageandcurrentstillsatisfiesaun

3、iformtransmissionline'sdistributedparametersmodelafterdistributedvoltageandcurrentpassthroughthesamelinearcircuit.Thedistributionofvoltageisalinerfunctionalongthetransmissionlinewhenitsfrequencyisnearpowerfrequency.Onthebasicoftheanalyticalresults,anewschemeoflongtra

4、nsmissionlinecurrentdifferentialprotectionbyusinginstantaneousvalueafterequaltransferprocesseswaspresented.Thevoltageandcurrenthaveequaltransferprocessesfromprimaryelectricalquantitiestoinstantaneousvaluesusedbydifferentialprotection.Atfirstthecurrentsamplingvaluespa

5、ssthroughvirtualdigitalCVTs.Andthenthevoltageandcurrentsamplingvaluesareprocessedbyalowpassfilter.Accordingtotheinstantaneousvalueoftransmissionlinevoltage,thecurrentinstantaneousvaluesofshuntreactorsandPequivalentcircuitcapacitancecanbecalculated.Afterremovingtheset

6、wokindsofcurrent,samplingvaluedifferentialprotectionbasedonallcomponentsandfaultcomponentcanbeapplied.TheresultscalculatedbyATPshowthattheproposedtechniquehashighlyreliability,ashortoperationtime,excellentperformanceunderhigh-resistanceearth-faultconditionsandphasese

7、lectionability.KEYWORDS：longtransmissionline;currentdifferentialprotectionbyusinginstantaneousvalueafterequaltransferprocesses;distributingcapacitance;capacitivevoltagetransformer;shuntreactor;relayprotection摘要：证明了线路分布电压、电流经过相同的线性电路传变后，其相互关系仍符合原线路分布参数模型，工频附近的电基金项目：国家

8、自然科学基金项目(50477046)。ProjectSupportedbyNationalNaturalScienceFoundationofChina(50477046)．压信号在线路上接近线性分布。在此基础上，提出一种用于远距离输电线路保护的等传变瞬时值差动