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.
出处
《中国电力》
CSCD
北大核心
2012年第5期16-19,共4页
Electric Power
关键词
变压器
差动保护
灵敏度
复故障
power transformer
longitudinal differentialproteetion
sensitivity
muhiple fauh
