文档名：染污绝缘子放电空间电场时频特性研究
摘要：恶劣气象条件地区的污闪事故时有发生,而目前对污秽外绝缘放电机制的理解还不够全面.为揭示污秽绝缘子放电空间电场特性,该文提出了一种新的污闪预警方法.在前期研究基础上,开展了染污绝缘子放电空间电场波形监测试验,重点研究了空间电场波形的时频特征参量.对于时域特征,对空间电场信号有效值、峰峰值、峰值因子三个时域特征量进行了研究,获得了其与盐密、绝缘子闪络状态的关系;对于频域特征,对空间电场信号进行傅里叶分解,获得了不同试验条件下的频谱图,发现发生闪络时,绝缘子空间电场信号中谐波分量占比升高,并提出可用三次谐波因子来描述绝缘子污闪放电发展程度.研究成果可进一步揭示污闪放电机制,并为解决恶劣环境下输电线路污闪预警的实际工程问题提供技术支撑.
Abstract：Transmissioncorridorsinevitablycrosscomplexenvironmentalareassuchascoastal,industrial,andheavilypollutedareas,resultinginongoingpollutionflashoveraccidents.Withthedevelopmentoftechnology,emergingnon-contactpollutionmonitoringtechnologieshavebeencontinuouslyproposed,butaunifiedconsensushasnotyetbeenformed.Atpresent,themainproblemsinnon-contactpollutionmonitoringofinsulatorsareasfollows.First,difficulttoimplementonsite.Methodssuchasvisiblelightmethod,soundwavemethod,etc.,aregreatlyaffectedbyexternalfactorssuchasnoise,radiation,perspective,etc.,andgreatlylimitedinon-siteuse.Second,thecharacterizationabilityisweak.Theessenceofinsulatorstringpollutionflashoverisacomplexdynamicelectricalprocess.However,theexistingmethodsarebasedonnon-electricalquantities,suchascolor,lightwaves,etc.,whichcanonlystaticallycharacterizeacertainpieceorpartofpollution,andhavepoorcorrelationwiththeoverallpollutionoftheinsulatorstring.Inordertoenrichthemeansofnon-contactmonitoringandpollutionflashoverprewarningforinsulators,andtorevealthemechanismofpollutionflashoverdischargeatadifferentlevel,thispaperestablishedaspaceelectricfieldmonitoringplatformforpollutedinsulatordischarge.Withthehelpofartificialfogchambertosimulateoperatingenvironment,theshortinsulatorstringwasusedasthetestobjecttocarryoutthepollutionwithstandtests.Duringthetests,themethodoffirstapplyingvoltageandthenwettingwasused,andtheelectricfieldsignalatfixedpointnearthelow-voltageendcrossarmofthestringwasmonitored.Throughthetestdata,thespatialelectricfieldsignalwaveformcharacteristicsunderdifferentpollutionlevelsanddifferentdischargedevelopmentstageswereanalyzed,anditstime-frequencydomaincharacteristicparameterswereextractedandsystematicallystudiedaswell.Theresearchresultsindicatethatthespatialelectricfieldsignalnearthelow-voltagesideoftheinsulatorstringcanreflectitspollutionflashoverprocess.Asthehumidityincreases,theamplitudeandeffectivevalueofthespatialelectricfieldwaveformbothincrease.Aftertheoccurrenceofarcdischarge,theamplitudecontinuestoriseandthewaveformundergoesdistortion,resultinginagentlefluctuationoftheeffectivevalue.Forcaseswherenopollutionflashoveroccurs,theamplitudeandeffectivevalueincreaseslightly.Duringpollutionflashoverdischarge,thespatialelectricfieldwaveformundergoesdepressionsatthepeaksandvalleys,andthedistortionismainlythethirdharmoniccomponent.Withthedevelopmentofsurfacewettinganddischarge,thethirdharmonicfactork3rapidlyincreases,andcanreach1whenapproachingpollutionflashover.Forcaseswherenopollutionflashoveroccurs,thegrowthrateofk3isrelativelysmall,lessthan0.2.Thetwodimensionlessfeatureparameters,peakfactorCpandthirdharmonicfactork3,aresignificantlypositivelycorrelatedwithpollutionlevel,withcorrelationk3＞Cp.Inpracticalengineering,themeanvalueofCpandk3,duringtheperiodofdampcanbecalculated,andtherepresentativesaltdensitycanbeevaluatedthroughtheExponentialfunctionfitting.Thisresearchutilizestherelationshipbetweentheinsulatorsurfacepotentialdistributionandthespatialelectricfieldtorevealitstime-frequencycharacteristicmechanismunderpollutionflashoverdischarge.Thedistributionofsurfacepotentialofinsulatorunderdifferentoperatingconditionshassignificantdifferences.Afterthepollutionlayeriswetanddry-bandsform,theoverallsurfacepotentialrises,resultinginanincreaseintheamplitudeofthespatialelectricfieldwaveform.Aftertheoccurrenceofpartialarc,thesurfacepotentialdistributionismainlydeterminedbythedry-bands'voltagedrop,soasthespatialelectricfieldwaveform.Therefore,adepressionofthespatialelectricfieldwaveformoccursatthepeaksandvalleysofthesinecurve,wherethepartialarcoccursandthelowestdry-bands'voltagedropforms.
作者：张东东 罗威 黄宵宁 张志劲 韩学春 Author：ZhangDongdong LuoWei HuangXiaoning ZhangZhijin HanXuechun
作者单位：南京工程学院电力工程学院南京211100输变电装备技术全国重点实验室(重庆大学)重庆400044国网江苏超高压公司南京211102
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(9)
分类号：TM216
关键词：绝缘子 污秽 非接触式监测 空间电场 时频特性 污闪预警
Keywords：Insulator pollution non-contactmonitoring spatialelectricfield timeandfrequencydomaincharacteristics pollutionflashoverprewarning
机标分类号：TN911.7-34TM75P319.11
在线出版日期：2024年5月13日
基金项目：国家自然科学基金，国网江苏省电力有限公司科技项目染污绝缘子放电空间电场时频特性研究[
期刊论文] 电工技术学报--2024, 39(9)张东东 罗威 黄宵宁 张志劲 韩学春恶劣气象条件地区的污闪事故时有发生,而目前对污秽外绝缘放电机制的理解还不够全面.为揭示污秽绝缘子放电空间电场特性,该文提出了一种新的污闪预警方法.在前期研究基础上,开展了染污绝缘子放电空间电场波形监测试验,重...参考文献和引证文献
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