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ID:36838936
大小:3.07 MB
页数:73页
时间:2019-05-16
《超高压输电走廊土壤电阻率测量及其电场分布特征研究》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、西南交通大学硕士研究生学位论文第1II页methodandelectriccoe伍cientsmethod,thecurvilinearintegralmethodinthree-dimensionalspacewasobtainedtocalculateequivalentchargeonconductorsurface,extensionofwhichthegeneralmethodofcalculatingequivalentchargeoneachsub·conductorsurfaceformulti-conducto
2、rtransmissionsystemwasdeducedfurthermore.Byscalardecompositionofvectorialintegralforspaceelectricfield,howtoworkouttheeffectivevalueofeachcomponentanditscompositionofpowerfrequencyelectricfieldunderACtransmissionlinewasgivenaswellasitsinstantaneousvalueexpressioninti
3、medomain.Themathematicalmodelthatwastakenconductorsagintoconsiderationtocalculatepowerfrequencyelectricfieldinthree-dimensionalspacewasestablishedbasedondesignparametersofsome500kVEHVtransmissionline.Accordingtothree—dimensionalcurvilinearintegralmethod,thedistributi
4、onfunctionofequivalentrealchargeandequivalentimagechargeonconductorsurfacewasobtainedrespectivelybymeansofMatlabnumericalcalculation,afterwhichtheelectricdistributionongroundsurfaceaswellasontheplaneof1.5hi曲wasgotandcomparedwimthatinthecenterofspancalculatedundertwo-
5、dimensionalmodel,theaccuracyandvalidityofthree-dimensionalmodelandcurvilinearintegralalgorithmwasverified.Thetransverseandlongitudinaldistributioncharacteristicsofthree—dimensionalelectricfieldaswellasitsvariationregularityofeachcomponentwereanalyzed.Theresultshowedt
6、hattheXaxiscomponentofelectricfieldongroundsurfaceinthecenterofspanwaszeroandtheelectricfieldwasdeterminedbyYaxisandZaxiscomponentsamongwhichtheproportionofZaxiscomponentwaslarger.Theelectricfielddecreasedgraduallywiththemigrationoftransversedistanceandtheproportiono
7、fxaxiscomponentgotlargerandlargeryetZaxiscomponentwasstillthemajorfactortodetermineelectricfield.Electricfieldreachedtomaximumatthepositionthatwasabout3metersfarawayfromlateralconductorsofthetwosidephasesinthecenterofspanandthenreducedtowardsthetwosidesoftowersymmetr
8、icallyuntilitreachedtominimumatthepositionoftower(neglectingthedistortioneffectscausedbytower).Inaddition,electricfieldreducedsharp
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