基于形态学的小电流接地系统单相接地故障选线方法

Single Line to Ground Fault Line Selection in Non-direct Ground Power System Based on Mathematical Morphology Method

分析了小电流接地系统单相接地故障信号的特点,总结了常用的小电流接地系统单相接地故障信号的处理方法,指出了这些方法的优点和适用范围,提出了一种基于数学形态学的小电流接地系统单相接地故障选线方法。该方法采用数学形态学方法对零序故障电流进行处理,去除谐波分量、噪声、漂移量的干扰,获得有效的系统故障信息,然后通过相应的选线算法识别出故障线路。仿真算例表明了所提方法的可行性。

The signal characters of single hne to ground fault in no-direct ground power system are analyzed. The merits and demerits of traditional signal processing methods in no-direct ground power system are summarized. A new fault line selecting method based on mathematical morphology method is proposed in condition of single line to ground fault happens. Mathematical morphology method is used to process the fault signal. The noise and the drift are filtered, the useful fault signal is obtained. The amplitude comparison and phase comparison method is used on the obtained fault signal to select the fault line. The analyzingfor simulation case shows the effectiveness of the proposed method.