振荡中不对称故障电流幅值判据系数的自适应修正

Method of Setting of the Self-adaptive Relay Protetction

分析振荡过程中,利用三相电流和零序电流大小来识别不对称短路故障判别的原理.对判别式中的系数进行自适应的修正,使系数随故障点的改变而改变,从而使保护能够少带延时甚至不带延时出口动作.

This paper analyses the measure that unsymmetrical three phases and zero sequence current identify unsymmetrical fault during the power swing and amending modulus of the discriminants base on self-adaptive. The count of modulus can change with the shift of the point of fault. So the delayed time can be reduced, even instantly distinguish power swing and fault.