輸電線路桿塔接地裝置對人身安全性影響評估及防護措施研究.pdf

1、長沙理工大學碩士學位論文輸電線路桿塔接地裝置對人身安全性影響評估及防護措施研究姓名：周鋒申請學位級別：碩士專業(yè)：高電壓與絕緣技術指導教師：李景祿201205ABSTRACTWiththerapiddevelopmentofthepowergridscale，thehybridtransmissiongridofACandDCistakingshape，becauseofurbanandruralintegrationindevelope

2、dareas，growingdensityofhigh—voltagetransmissionlineconstructionmakethetransmissionlinesinevitablyhavetopassthroughthetowns，factories，neighborhoodsandschoolsnearbydenselypopulatedareasUndertheeffectoflightning，filthy，insu

3、lationdeteriorationandotherfactors，whenhigh—voltagetransmissionlinesubjecttogroundshort—circuitfault，groundshort—circuitcurrentflowthroughgroundingdevice，resultingingroundpotentialriseofthefaultpoint，formingdangerouscont

4、actvoltageinthetower，producingastepvoltageinthevicinityoftheground，posingathreattothepeopleinthevicinityDuetothelimitationsofscienceandtechnology，earlypowersystemworkersputmoreemphasisonpowerplants，substations’touchvolta

5、geandstepvoltage，highvoltagelinetowerslocatedinthemountainwheresparselypopulated，themainconsiderationistowerlightningsafety，personalsafetyisrarelyconsideredThepaperfirstputanalysisonpersonalelectricshocktheory，therootcau

6、seofelectricshocktohumanhealthresearchthedifferentresponsestohumanhealthpowerfrequencythatthedifferentresponsesandseverityofthegroundshort—circuitcurrentandlightningsurgecurrentimpacttohumanhealth，researchthetypeoftransm

7、issionlinetowergroundingdevice，depthandsoilparameters，usingthefiniteelementmethodtostudythepotentialdistributioninthevicinityofthecommontransmissionlinetowergroundingdevicebyANSYSsoftwareThencombiningthefieldresearchdata

8、of500kVJin—daline，calculatingthetouchvoltageandstepvoltageoftypicalgroundingdevices，assessingthepersonalsecurityeffectoftypicaltowers，usingnumericalmethodsandMATLAB，studystepvoltageandtouchvoltagedistributionofasingleeat

9、hernetportofgroundinggridFinally，accordingtotheabovetheoreticalcalculationandsimulationanalysis，proposereasonableimprovementmeasuresandprotectionmethodsThisworkrevealstherootcauseofthehumanelectricshockcasualtyisthecurre

10、ntflowingthroughthebody，causingthehumanheartfibrillation；assessthepersonalsecurityeffectof500kVJin—dalinetypicaltower，proposenewmeasurestoimprovetowergroundingdevicemodelsandotherreasonablemeasuresKeywords：bodywithstandc