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时间:2020-03-28
《变压器高、低压侧后备保护的配合问题分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷第1期电力系统保护与控制V0I.42N0.12014年1月1日PowerSystemProtectionandControlJan.1,2014变压器高、低压侧后备保护的配合问题分析吴水兰,宋小会,刘洋,郭志忠,蔡常群(1.许继电气股份有限公司,河南许昌461000;2.哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨1500013.许继集团有限公司,河南许昌461000)摘要:就一例典型的变压器低压侧两相短路故障引起变压器高压侧后备保护先于低压侧后备保护动作的事故案例,分析了变压器低压侧两相短路故障时变压器高、低压侧电流的特性,并结合变压器低压侧其他故障情况,得出变压器高压侧
2、后备保护和低压侧后备保护灵敏度的差异性。发现电力行业标准DL/T584—20073~11OkV电网继电保护装置运行整定规程》的规定不合适。特此对变压器后备保护整定提出一点建议:高压侧后备保护与低压侧后备保护的定值灵敏度要配合,且配合系数应不小于1.15。该建议有效提高了变压器高、低压侧后备保护的可靠性。关键词:变压器:后备保护;两相短路故障;保护灵敏度;保护整定Analysisofthecooperationbetweentransformer’SbackupprotectionofhighvoltagesideandlowvoltagesideWUShui.1an,SONGXiao.
3、hui,LIU*Fang,GUOZhi.zhong,CAIChang.qun(1.XJElectricCo.,Ltd,Xuchang461000,China;2.InstituteofElectricalEngineeringandAutomation,HarbinInstituteofTechnology,Harbin150001,China;3.XJGroupCorporation,Xuchang461000,China)Abstract:Basedonatypicalcasethatthebackupprotectionofhighvoltagesidetrippedearlie
4、rthanthebackupprotectionoflowvoltagesidewhentwo-phaseshortcircuitfaulttookplaceatthetransformerlowvoltageside,thispaperanalyzesthecharacteristicsofthecurrentsofhighvoltagesideandlowvoltagesidewhentwo—phaseshortcircuitfaulttakesplaceatthetransformerlowvoltageside.Consideringthesituationsofotherki
5、ndsoffaultsatthetransformerlowvoltageside,thispaperfindsoutthediferenceofsensibilityofbackupprotectionsbetweenthehighvoltagesideandlowvoltageside.ThepaperfindsthattheprovisionDL/T584—20073~110kVoperationsettingregulationsofrelayprotectionequipmentsofpowernetworkinthestandardsofthepowerindustryis
6、inappropriate.Hereby,thispapergivesanadviceonthesettingoftransformer’Sbackupprotection:thesetingsensibilityofbackupprotectionsofhighvoltagesidemustassortwiththatofthelowvoltageside,andthefitcoeficientmustbenotJessthan1.15.Thisproposalefectivelypromotesthereliabilityoftransformer’Sbackupprotectio
7、nofhighvoltagesideandlowvoltageside.Keywords:transformer;backupprotection;two—phaseshortcircuitfault;sensibilityofprotection;protectionsetting中图分类号:TM76文献标识码:A文章编号:1674-3415(2014)01-0149—050引言某变电站31.5MVA变压器,在低压侧线路发生A、C相问短路故障
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