方向性过流保护故障模拟的分析及校验

Analysis and Verification of Fault Simulation of Directional over Current Protection

分析电力系统发生单相接地短路、两相短路和三相短路下的故障电流和电压特点,从而阐明方向性过流保护的功率继电器在不同故障情况下的动作区,合并动作区并设置最大灵敏角就能满足保护的可靠性和选择性要求。

The characteristics of fault current and voltage under unidirectional grounding short circuit,two-phase short circuit and three-phase short circuit in power system are analyzed.The action area of the power relay of directional overcurrent protection under different fault conditions is introduced.Combining the action area and setting the maximum sensitivity angle can meet the reliability and selectivity requirements of the protection.