基于广域继电保护的矿井选择性剩余电流保护

Selective Residual Current Protection for Mine Based on Wide Area Relaying Protection

为了快速定位故障区域,避免越级跳闸,根据广域继电保护的分区结构原理,提出了一种基于广域继电保护的矿井选择性剩余电流保护方法。根据煤矿井下供电的特点,对井下供电线路进行区域划分。在每个划分的区域里通过零序电流互感器得到零序电流,以相邻区域零序电流的差值作为特征量,并以特征量为判据,比较不同区域零序电流特征量的广域信息,最终得出故障点所在区域。MATLAB仿真结果表明,所提方法不仅能够确定故障线路,而且可以进一步得到故障线路中的故障区域,有助于提高井下检修的效率。

When leakage fault occurs in the coal mine,in order to quickly locate the fault zone and avoid override trip,according to the partition structure principle of wide area relaying protection this paper proposed a mine selective leakage protection method based on wide area relaying protection. According to the characteristics of coal mine underground power supply,the underground power supply line is divided into regional division. In each of the divided regions through the zero sequence current transformer a zero sequence current is obtained and in adjacent areas the differential value of the zero sequence current is taken as the charact quantiby and the criterion,wide area information of different regional zero sequence current characteristics was compared. Finally,the fault points region was obtained. Matlab simulation results show that,the fault line selection method can not only determine the fault line,but also further get the fault area in the fault line. Which helps to improve the efficiency of downhole maintenance.