单故障和复故障下变压器差动保护计算分析  

A new analysis method for transformer differential current protection under single and multiple faults

作　　者：曹树江[1] 林榕[1] 魏颖莉[1] 

机构地区：[1]河北省电力公司,河北石家庄050021

出　　处：《中国电力》2012年第5期16-19,共4页Electric Power

摘　　要：采用全电流法对Y侧减零序电流的差动保护补偿原理进行推导。应用叠加原理,对不同补偿原理的变压器差动保护在单故障和复故障下的差电流进行计算。提出变压器低压侧区内、外异地2点接地故障差电流和差动元件灵敏度分析方法,并对不同故障类型下各种补偿原理的差动保护的动作灵敏度进行对比分析。结果表明,该叠加原理法简单快捷,大大提高了计算速度。A new method of transformer differential current protection, in which zero sequence current is subtracted from phase current by using full current model, is presented. The differential currents for superposition and compensation theories are calculated under both single and multiple fault scenarios. A method to analyze and compare sensitivity of the protection in different zones is proposed. Test results show the proposed calculation method is more sample and quick for single and inuhiple faults in different zones.

关 键 词：变压器 差动保护 灵敏度 复故障 

分 类 号：TM772[电气工程—电力系统及自动化]