高压电网地磁感应电流故障快速检测方法分析

Fast Detection Method of Geomagnetic Induced Current Fault in High Voltage Power Network

传统方法受外界环境的影响,得到的故障检测结果准确性低,且实现过程复杂,所需检测时间长。为此,提出一种新的高压电网地磁感应电流故障快速检测方法。分析地磁感应产生机制,将地表电位分布和磁感应强度结合在一起,引入灰色关联理论,结合变比计算健全度,通过健全度对高压电网线路实际状态和正常状态间的一致程度进行描述,将其看作检测依据对高压电网地磁感应电流故障进行检测。鉴于变比对故障检测结果的重要性,把检测线路不同环节电流变比看作变量,计算变比值。实验结果表明,所提方法检测精度高,所需时间短,整体性能强。

Traditional methods are affected by the external environment,resulting in low accuracy of the fault detection results,and the implementation process is complex,and the detection time is long.Therefore,a new fast detection method for geomagnetic induced current fault in HV power network is proposed. This paper analyzes the mechanism of geomagnetic induction,combines the surface potential distribution and magnetic induction intensity together,introduces the grey correlation theory,combined with the variation ratio to calculate the soundness,and describes the consistency between the actual state of the high voltage power network and the normal state through the soundness,and regards it as the detection basis for the geomagnetic induction of the high voltage power grid. Flow fault detection. In view of the importance of the ratio of change to fault detection results,the current ratio of different links in the detection line is regarded as variable,and the variable ratio is calculated. Experimental results show that the proposed method has high detection accuracy,short time and strong overall performance.