一种新型振荡中故障选相元件

振荡中故障准确选相是有选择切除故障和确保距离保护正确动作的前提。在分析现有振荡中选相元件需开放条件配合，导致出口延迟，且易出现误选，进而导致距离保护误动的基础上，提出了一种新型选相元件，此元件首先利用零、负序故障分量进行故障分区，在分区的基础上改变目前采用阻抗确定故障相的做法，而采用Clark变换，分别通过α，β模量信息进行故障选相。此选相方法充分发挥了零、负序故障分量以及模量变化在振荡期间不涉及相量偏移带来计算误差等优势，有效避免了阻抗选相在振荡中的弊端。文中给出了基于RTDS动模仿真数据的测试结果，理论和测试表明:此方法在振荡期间能够可靠、快速、准确地区分故障类型。

A New Type of Fault Phase Selector During Power Swing

The result of fault phase selector during power swing is a precondition to switch off the correct fault phase and ensure the right operation of distance protection relays.Based on the analysis of the performances of present selector during power swing,such as the delay of operating and being easy to select false fault phases,and therefore causing false operating of distance protection relay,a novel fault phase selector is presented.The selector firstly uses the zero-sequence and negative-sequence components...