方向闭锁过流保护典型拒动分析与其对策研究

Analysis of Typical Failures and Countermeasures of Directional Blocking Over-current Protection

方向过流保护用于风电场集电线线路时,经常发生将保护电流互感器极性接入方式按照发电机功率方向连接,方向为线路指向母线,导致方向过流保护事故拒动情景发生。文章通过阐述方向过流保护的动作原理和方向元件的正、负定义规定,结合风电场典型拒动案例分析,提出了此类方向过流保护的调试重点和防拒动应对策略。

When the directional over-current protection is used in the wind farm gathering wire line, the polarity connection mode of the protection current transformer is connected according to the generator power direction, and the direction is the line pointing to the bus, which causes the accident rejection scene of directional overcurrent protection to occur. By expounding the action principle of directional overcurrent protection and the positive and negative definition of directional component, based on the analysis of typical case of wind farm, this paper puts forward the debugging emphases and countermeasures of this kind of directional overcurrent protection.