纵联差动保护动作行为分析

Analysis of pilot differential relay operating characteristic

分析了差动保护的比例制动特性在IN/IM的复平面上的分布情况,并利用该坐标系分析了各差动保护的制动判据在通道对称及通道不对称情况下的安全性和灵敏性,得出故障分量差动保护(包括零、负序差动)抗通道不对称的性能要比相电流差动保护优越这一结论。

This paper plots percentage-differential relay characteristic curves in current-ratio plane and analyses line current differential relay performance during communications channel asymmetry and and weak-infeed end of a transmission line. It reaches the conclusion that fault components differential relays are more secure and sensitive than phase current differential relays.