transformer current differential protection

Analysis some problems of wrong current in transformer differential protection

关于主变差动保护电流不正确的原因分析

Analysis of Magnetic Inrush Current of Three-phase Transformer and the Differential Protection Scheme

三相变压器励磁涌流及保护方案

Measuring method of ratio braking characteristic curve on differential protection for impedance-matching balance transformer with three-phase current power supply

用三相电流源测试阻抗匹配平衡变压器差动保护比率特性曲线的方法

By use of this method, the mal-operation area of any differential protection criteria is visualized when current transformer saturates due to the large through current induced by external fault.

利用这种分析方法，可以直观地得到：对于任意一种特定的判据，当外部故障的穿越电流造成电流互感器饱和时，判据的误动概率；

The residual magnetic flux intensity makes the starting work point of current transformer change on B-H curve, and hence the magnetic saturation state is aggravated in shorter time, which is the main reason to cause the misoperation accident of differential protection.

铁心剩磁的存在使电流互感器在B-H曲线上的起始工作点发生变化，加重了饱和程度和缩短进入饱和时间，这是差动保护误动的重要原因。