本文针对数字式保护和故障点测距特点,提出和分析了一系列利用故障分量的迭相方案。这些方案原理简单、动作可靠、分析方便、不受负荷电流的影响,几乎不受故障点位置、电源阻抗和故障点过渡电阻的影响,也不受系统振荡的影响、能在任意系统结构和故障型式下都明确可靠地选出故障相。因此可作为数字式保护的较理想的选相元件方案。
In accordance with the characteristic of digital relay and fault locatoin four methods of phase selection on fault component are presented in this paper.These methods are simple in principle, reliable in action, and immune from load flow,system oscillation.Hardly affected by fault location, source impedance and fault resistance, they can select fault phase reliably for any power system and fault type.As phase selection schemes, they can be used for perfect digital relay.
