并联电容器对变压器差动保护的影响  

Influence of Parallel Capacitor on Transformer Differential Protection

作　　者：陈实[1,2] 郭晓[1,2] 张尧[1,2] 史华勃[3] 

机构地区：[1]国电南京自动化股份有限公司,江苏南京211100 [2]南京国电南自电网自动化有限公司,江苏南京211100 [3]国网四川省电力公司电力科学研究院,四川成都610072

出　　处：《四川电力技术》2014年第3期70-72,76,共4页Sichuan Electric Power Technology

摘　　要：对变压器低压侧区内故障差动保护动作较慢的情况做了详细分析,指出其原因为并联电容器中的串联电抗器引起故障时刻并联电容器发生振荡放电,导致变压器励磁涌流判据闭锁差动保护。并分析了并联电容器振荡放电频率与电容器选型的关系,其产生的谐波分量对变压器励磁涌流判据的影响。通过EMTDC进行了仿真研究,提出了对变压器差动保护的励磁涌流判据的建议。According to the slower operation of differential protection of internal fault in low voltage side of transformer , the reason is analyzed that the selection of serial reactor in the parallel capacitors leads to the oscillation discharge during the fault.And the transformer differential protection is blocked by transformer inrush criterion .Then the relationship between the oscillation discharge frequency of parallel capacitor and the type selection of capacitor is analyzed as well as the effects of har -monic component on transformer inrush criterion .Through the EMTDC simulation , the advices for the inrush current criteria of transformer differential protection are proposed .

关 键 词：变压器差动保护 并联电容器 励磁涌流 谐振 

分 类 号：TM771[电气工程—电力系统及自动化]