摘要
目前变压器差动保护差流计算方法主要有d->Y变换和Y->d变换两种,通过对两种不同差流计算方法的分析比较,发现在一般性故障时两种差流计算方法都只计算正序电流、负序电流的差值,但在特殊故障下,Y->d变换会将零序电流计入差流计算,引起两种保护动作情况不同。
There are two ways, namely d-Y and Y-d, to calculate differential current of transformer when differential protection acts. Through comparing and analyzing the two calculating principles, it is found that at general faults the two differential calculation principles both only count positive sequence current and negative sequence current, but at special faults, if adopting Y- d principle,differential calculation will include zero-sequence current, so as to cause different protection actions.
出处
《山西电力》
2016年第2期57-59,共3页
Shanxi Electric Power
关键词
变压器差动保护
差流计算
故障
transformer differential protection
differential calculation
fault
