基于故障电流的距离保护加速动作判据研究

Research on the Accelerated Action Criterion of Distance Protection Based on Fault Current

通过分析距离保护II段时间整定公式,指出传统继电器距离保护II段保护时间整定方法存在缺陷,即无法根据故障点位置远近使继电器具有弹性动作时间,提出以阻抗修正系数为基础的新的时间整定系数作为加速动作的判据。通过使用MATLAB软件仿真,针对相间短路和单相接地故障进行分析,验证该方法能够满足更高要求速动性。

The article analyzes the distance protection II time setting formula,point out that the traditional relay distance protection stage II protection time setting method has defects,the relay cannot make flexible action time according to the location of the fault point.A new time setting coefficient based on the impedance correction coefficient is proposed as the criterion of acceleration.By using MATLAB software to analyze the phase-to-phase short-circuit and single-phase grounding faults,it is verified that the method can meet the higher requirements of quick-action.