考虑降雨修正的干字型耐张塔跳线风偏放电在线预警方法.pdf

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1、第43卷第5期电力系统保护与控制VO1．43NO．52015年3月1日PowerSystemProtectionandControlMar．1．2015考虑降雨修正的干字型耐张塔跳线风偏放电在线预警方法熊小伏，翁世杰，王建，李哲，梁允(1．输配电装备及系统安全与新技术国家重点实验室(重庆大学)，重庆400044；2．国网河南省电力公司电力科学研究院，河南郑州450052)摘要：近年来，输电线路屡次发生风偏放电事故，已严重影响到电力系统的安全可靠运行。由于防风偏措施代价昂贵、实施困难等因素，导致风偏放电事故难以避免。因此从运行角度出发提出一种基

2、于气象信息的耐张塔风偏放电的在线预警方法。针对较常见、易发生风偏放电的干字型耐张塔，结合精细化气象预报信息，计算悬垂绝缘子串的风偏角，然后通过引入杆塔的二维笛卡尔坐标系得到中相跳线以及边相跳线与杆塔最小间隙的解析计算式，再与规程规定的允许最小间隙进行比较，得到预警结果。考虑到降雨会使间隙放电电压降低，引入降雨影响系数来修正规定的允许最小间隙以使预警更加准确。最后，通过实例分析验证了该方法的可行性和精确性。关键词：风偏放电；气象信息；干字型耐张塔；在线预警；降雨Anonlineearlywarningmethodforwindageyawdis

3、chargeofjumpertowards“JG”typestraintowerconsideringcorrectedbyrainfallXIONGXiaofu，WENGShijie，WANGJian，LIZhe，LIANGYunr1．StateKeyLaboratoryofPowerTransmissionEquipment&SystemSecurityandNewTechnology,ChongqingUniversity,Chongqing400044，China；2．ElectricPowerResearchInstitute，St

4、ateGridHenanElectricPowerCompany，Zhengzhou450052，China)Abstract：Inrecentyears，accidentsofwindageyawdischargeoccurontransmissionlinesfrequently,andhaveseriouslyaffectedonsecurityandreliabilityofthepowersystem．Becausethepreventionmeasuresofwindageyawareexpensiveandhardtoimple

5、mentandotherfactors，itishardtoavoidtheaccidentofwindageyawdischarge．Anonlineearlywarningmethodbasedonmeteorologicalinformationforwindageyawdischargeofstraintowerisproposedfromtheperspectiveofoperation．Thispaperaimsatthe“JG’’typestraintowerwhichiscommonandpronetoraiseacciden

6、tofwindageyawdischarge．Makinguseofrefinedmeteorologicalforecastinginformation，thewindageyawangleofsuspensioninsulatorstringiscalculated，andthentheanalyticalequationtocalculateminimumclearancefromcenter-phasejumperandside-phasejumpertotowerbodyisobtainedthroughleadingtwodime

7、nsionalDescartescoordinatesystemintotowermodel，andthenthecomparisonwithpermissibleminimumclearanceisconductedtogetwarningresults．Moreover,consideringthattherainwillreducethedischargevoltageofclearance，theinfluencecoeficientofrainfallisintroducedtorevisethepermissibleminimum

8、clearancetomakethewarningmoreaccurate．Finally,thefeasibilityandaccuracyofthepropos