文档名：基于谐波分量的配电电缆绝缘劣化状态带电检测技术
摘要：由于受城市电网停电检修的限制,配电电缆的谐波电流带电检测技术有望成为传统离线诊断方法的有效补充,以提升配电电缆绝缘状态的诊断实时性.该文搭建了10kV配电电缆真型实验平台,并制备了受潮与长时热老化的典型缺陷电缆.通过COMSOL有限元电磁仿真获取了典型缺陷下电缆绝缘体的磁通演变规律,通过实验测试得到电缆典型缺陷时谐波电流特性及统计特征规律.在此基础上,利用谐波特征数据,构建了基于LASSO回归分析的配电电缆劣化程度分析方法,进一步提出基于聚类分析的缺陷类型辨识方法.结果表明,配电电缆谐波电流的3、4、5、11次谐波与电缆劣化状态密切相关.融合主成分分析(PCA)数据降维和期望最大化聚类分析的模型用于受潮与正常电缆状态辨识时,识别准确度最高可达75.64%.该文提出的带电检测手段及评估方法能有效排查具有潜伏性缺陷的高危电缆.
Abstract：Duetorestrictionsimposedbypoweroutagesformaintenanceontheurbanpowergrid,theon-linedetectiontechnologyofharmoniccurrentsindistributionnetworkcablesisexpectedtobecomeaneffectivesupplementtotraditionalofflinediagnosticmethods,aimingtoenhancethereal-timediagnosisoftheinsulationstatusofdistributionnetworkcables.Inthisstudy,COMSOLfiniteelementsoftwarewasusedtosimulatetheporesandwatertreedefectsintheXLPEinsulationlayerofcables.ThedistributionofmagneticfieldstrengthinXLPEcablesunderdifferentdefectconditionswascomparedandanalyzed.Arealexperimentalplatformfor10kVdistributionnetworkcableswasestablished,andtypicaldefectivecableswithmoistureandlong-termthermalagingwereprepared.TheinducedcurrentsofagingdefectsandwatertreedefectsintheXLPEcableinsulationlayerwerecollectedinexperiments,andthe2ndto11thharmoniccurrentsunderdifferentinsulationdefectswereextracted.Theinfluencepatternsofporedepthcausedbyagingandexternalmoistureintrusiononinducedcurrentswereobtained.Toeffectivelyassessthedegreeofcabledegradation,acabledegradationassessmentmethodbasedontheharmonicfeaturesofinducedcurrentswasconstructedusingLASSOregression.Inthepredictionanalysisofnormalthermallyagedcables,therootmeansquareerrorofLASSOregressionwas17.1days,accountingfor14%oftheactualagingtimerange,indicatinghighaccuracy.Thepredictionofagingtimeformoisture-affectedcableswaslonger,consistentwiththeactualstateofacceleratedinsulationagingduetomoisture.Toaccuratelyidentifythetypeofinsulationlayerdefectsincables,adefectidentificationmethodcombiningprincipalcomponentanalysisandclusteringalgorithmwasdevelopedbasedonthedatasampleset.Whenusingharmonicdataofa300Atestcurrentforclusteringidentificationofmoisture-affectedandnormalagingcables,theaccuracyreached75.64%,effectivelydistinguishingbetweenmoisture-affectedcablesandnormalcables.Thecableinsulationlivediagnosistechnologyproposedinthisstudy,basedontheharmoniccurrentcharacteristics,integratescableinsulationdegradationstatus,inducedharmoniccurrentfeatures,andclusteringanalysisalgorithms,achievingintelligentidentificationofcableinsulationdefects.
作者：徐海松 张大宁 胡冉 卢旭 王安哲 王昱力 张冠军 Author：XuHaisong ZhangDaning HuRan LuXu WangAnzhe WangYuli ZhangGuanjun
作者单位：西安交通大学电气工程学院西安710049深圳供电局有限公司深圳518000中国电力科学研究院有限公司武汉430000
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(7)
分类号：TM85
关键词：感应电流谐波 XLPE劣化 LASSO回归分析 期望最大化聚类分析 绝缘状态评估
Keywords：Inductivecurrentharmonics XLPEdeterioration LASSOregressionanalysis expectation-maximizationclusteringanalysis insulationstateassessment
机标分类号：TM711TM855TM464
在线出版日期：2024年4月12日
基金项目：深圳供电局有限公司科技项目基于谐波分量的配电电缆绝缘劣化状态带电检测技术[
期刊论文] 电工技术学报--2024, 39(7)徐海松 张大宁 胡冉 卢旭 王安哲 王昱力 张冠军由于受城市电网停电检修的限制,配电电缆的谐波电流带电检测技术有望成为传统离线诊断方法的有效补充,以提升配电电缆绝缘状态的诊断实时性.该文搭建了10kV配电电缆真型实验平台,并制备了受潮与长时热老化的典型缺陷电...参考文献和引证文献
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基于谐波分量的配电电缆绝缘劣化状态带电检测技术 A Live Detection Technology of Distribution Network Cable Insulation Deterioration State Based on Harmonic Components
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