中低压配电网单相接地故障检测技术的研究

《中低压配电网单相接地故障检测技术的研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、北京交通大学硕士学位论文中低压配电网单相接地故障检测技术的研究姓名：黄强申请学位级别：硕士专业：电力系统及其自动化指导教师：王毅20071201』E鏖窒型厶主亟±堂垃丝塞△旦SI＆堑3ABSTRACTInelectricsystem，single-phaseearthfaultoccupywholedefective60％upwards．Inangivensituation，thesecurityofelectricsystemisonlydecidedbytheworkmodeofneutralpoint．InOUrcoun廿、f,powerdistributio

2、nsystemof6～35kvextensivelyusdngisolatedneutralsystemorbyextinctioncoilgroundedundercurrentearthedsystemmodeofconnection，Thisthesisanalysisthecharacteristicofeachmodeofconnection，andtakingthestudyofneutralpointearthedbyparallelconnectionofsmallresistanceandextinctioncoilwhichiSwidelyuse

3、d．Asforundercurrentearthedsystem，whensingle—phaseearthfaultOCCUrS，theshort-circuitcurrentisnothighenoughtoendangerthesafetyofequipmentsandsystem，linevoltageofthesystemisstillsymmetry,andke印ontransportingpowertolaSerS，Bntthemajordefectis：Whensingle-phaseearthingOccurs，otherphasevoltager

4、ises，intermittencemalfunctionCanbril唱transienthighvoltage,itistendtostimulateadangerousphasetophasefault，Sointhissystem，whensingle-phaseearthingoccurs，weshouldfindoutthegroundedcircuitintime，andexcisethefaultlineassoonaspossible，Therealesomestudytowardssingle·phasefault，buttheya11based

5、onmalfunctionrouteselectioninbusbarend，Theorienttodefectpointisalsobasedonbusbarend,liketravelingwaveranging．Tllisthesisanalysisdifferentkindsoftestmethodofundercurrentearthedsystemwhensingle—phasefaultOCCUrS，andbringforwarddifferentkindsofmethodtoestimatethefaultOCCUJ'Sbeforeorbehindt

6、heteststation，Inthisthesispayattentiontothesystemwhichneutralpointisgroundedbyparallelofresistenceandextinction．ThissystemCallopenthefaultlinerapaidlyandCangivefailuremessageclearly．Alsointroducestwofiltermethods：firandffl．Thenbasedontheactivecomponenttheory,designadevicewhichCancollec

7、tsamplingbywirelesscommunicationandproceeddataprocessingbyTMS320VC5402．111ehardwarepartofthisthesisintroducesperipherysamplecircuit、conditioningcircuitandothercircuitswithTMS320VC5402．Introducesalgorithmbasedonphasecomparison,aswellasalgorithmicflowchantoimplementhardware．Thisthesisi