火箭触发闪电的回击电流及电场特征分析
文档名：火箭触发闪电的回击电流及电场特征分析
摘要：2019年夏季在广州开展了火箭引雷试验,成功地触发了14次闪电,总回击(RS)数达74次,平均回击数为5.3次,单次闪电的最大回击数为14次.该文对火箭引雷的回击电流及不同距离电场波形特征进行了分析.回击的间隔时间、峰值电流、10%～90%上升时间、半峰值宽度、1ms转移电荷和1ms作用积分的几何平均值分别为38.45ms、12.38kA、0.25μs、8.31μs、0.68C和2.12×103A2·s,回击电流的转移电荷量和作用积分量均与回击峰值电流呈幂函数相关性.回击的先导电场强度峰值和回击电场强度峰值会随距离的增大而减小,而电场的10%～90%上升时间和半峰值宽度会随距离的增大而增大.回击电场强度峰值会随距离的增大而呈现出幂函数减小,且峰值电流与不同距离的先导电场强度峰值和回击电场峰值均呈现一定线性相关,距离越大,其线性拟合关系越好.
Abstract：Lightningfaultsareoneofthemaincausesoftrippingoftransmissionlines.Obtainingreallightningparametersiscrucialforlightningprotectioninpowersystems.Oneofthereasonableandeffectivemeansistriggeredlightningtest.Duetodifferencesinclimaticconditionsandcloudchargedistribution,lightningdischargeparametersvarysomewhatfromregiontoregion.TherearerelativelyfewrelevantexperimentalstudiesinChina,andthereisaneedtoaccumulatemorelightningdischargedatafromdifferentregions.Todeterminehowlightningdischargeoccur,toprovideaccuratelightningdischargeparametersneededforlightningprotectionwork.Tostudyandtestlightningstrikemechanismsandtoevaluatetheperformanceoflightninglocationsystems.Rocket-triggeredlightningtestwasconductedinGuangzhouinsummer2019.Lightning-triggeredrocketswerelaunchedundersuitablethunderstormweatherconditionstotriggerupwardnegativepolaritylightning.Thelightningcurrentflowedthroughtheprimingrodthroughacoaxialshuntwitharesistancevalueof1m?andthenflowedtoground.Therebyobtainingarealisticlightningcurrentwaveform.Andthreeflatplatecapacitorantennasweresetupat58m,90mand1600mfromtherocketlauncherasthemeasurementsoftheverticalelectricfieldofthelightning.Studyingthetrendofelectricfieldwaveformparameterswithdistanceandtherelationshipbetweencurrentparametersandelectricfieldparameters.Atotalof14flashesweresuccessfullytriggered,withatotalof74returnstrokes,anaverageof5.3returnstrokes,andamaximumof14returnstrokesforasingleflash.Definingsixcurrentwaveformparametersandplottingtheparameterdistributions.Thegeometricmeanvaluesoftheintervaltimeofreturnstrokes,peakcurrent,10%～90%risetime,half-peakwidth,1mstransferredchargeand1msactionintegralwere38.45ms,12.38kA,0.25μs,8.31μs,0.68C,and2.12×103A2·s,respectively.Therelationshipbetweenthecurrentparameterswasinvestigated.Boththe1mstransferredchargeandthe1msactionintegralwerecorrelatedwiththepeakcurrentasapowerfunction.Thedistributionsoffiveelectricfieldcharacteristicparametersatdifferentdistances,includingleaderelectricfieldpeak,returnstrokeelectricfieldpeak,10%～90%risetime,half-widthtimeandinversepeakratio,werecounted.Bynormalizingthepeakcurrentto15kA,itwasfoundthattheleaderelectricfieldpeakandreturnstrokeelectricfieldpeakwoulddecreasewithincreasingdistance,whilethe10%～90%risetimeandhalf-peakwidthoftheelectricfieldwouldincrease.Thereturnstrokeelectricfieldpeakshowedapowerfunctiondecreasewithincreasingdistance.Thepeakcurrentshowedacertainlinearcorrelationwithboththeleaderelectricfieldpeakandreturnstrokeelectricfieldpeakatdifferentdistances.Andthelargerthedistance,thebetterthelinearfit.Thiswascausedbythefactthattheelectricfieldatclosedistancesisdominatedbyelectrostaticandradiationfields,andtheelectricfieldatfardistancesisdominatedbyradiationfields.Thecurrentandelectricfieldwaveformdatareportedinthispaperprovidereliabledatasupportfortestingthelightningreturnstrokemodelandlightningprotection.
作者：蔡力 杜懿阳 彭向阳 周蜜 王建国 Author：CaiLi DuYiyang PengXiangyang ZhouMi WangJianguo
作者单位：武汉大学电气与自动化学院武汉430072广东电网有限责任公司电力科学研究院广州510000
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(1)
分类号：TM863
关键词：火箭引雷电流电场回击
Keywords：Rocket-triggeredlightningcurrentelectricfieldreturnstroke
机标分类号：P4TM862P631.32
在线出版日期：2024年1月18日
基金项目：国家自然科学基金火箭触发闪电的回击电流及电场特征分析[
期刊论文]电工技术学报--2024, 39(1)蔡力杜懿阳彭向阳周蜜王建国2019年夏季在广州开展了火箭引雷试验,成功地触发了14次闪电,总回击(RS)数达74次,平均回击数为5.3次,单次闪电的最大回击数为14次.该文对火箭引雷的回击电流及不同距离电场波形特征进行了分析.回击的间隔时间、...参考文献和引证文献
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