小電流接地系統(tǒng)單相接地故障測距方法的研究.pdf

1、天津大學(xué)碩士學(xué)位論文小電流接地系統(tǒng)單相接地故障測距方法的研究姓名：董凱達(dá)申請學(xué)位級別：碩士專業(yè)：電力系統(tǒng)及其自動化指導(dǎo)教師：張艷霞20070601ABSTRACTInChina，smallcurrentgroundingstyle，includingneutralinsulatedandneutralgroundedwithPetersencoil，iswidelyusedinthedistributionnetworksof66KVo

2、rlowerlevelsSinglephasegroundingfaultisthemostcommonfaultinthesmallcurrentgroundingsystemHowtolocatethegroundingpointisatechnicalproblemlongexistingAccordingtothecharacteristicofthezero—sequencecurrenttravelingwaveappear

3、ingwhensinglephasegroundingfaultoccursinsmallcurrentgroundingsystem，theproblemthattheerroristoogreatwhenonlythetravelingwavesofthesamepolarityareusedisanalyzedinthepaperBasedontheanalysis，anewmethodforfaultlocationinsmal

4、lcurrentgroundingsystemisproposedinthispaperinwhichbothpositivetravelingwaveandnegativetravelingwavesareusedFirstly，theauthorintroducestheresearchbackgroundoffaultlocationinsmallcurrentgroundingsysteminthepaperandanalyze

5、sallkindsoffaultlocationmethodsexistingnowadaysSecondly，thebasictheoryofwavelettransformanditsapplicationinthesignalsingularityidentificationareintroduced，whichsuppliesanadvancedmathtoolforthetravelingwavefaultlocationme

6、thodThirdly，theauthorexplainsthebasictheoryandmainmethodsoftravelingweavefaultlocation，whichprovidesadetailedtheorybasisforthenewfaultlocationmethodFinally，theauthordemonstratestheprincipleandthedetailedstepsofthenewmeth

7、od，showsthesimulationresultsunderallkindsofconditions，andanalyzestheinfluencesofallkindsofparametersBasedonthesimulation，thecorrectnessofthenewmethodisprovedThenewmethodhasagoodabilityofanti—disturbingItsreliabilityisals