基于注入法的变电站直流电源接地故障检测方法

Direct Current Power Grounding Fault Detection Method in Substation Based on Injection Method

由于故障电流变化较小不易察觉,传统故障检测方法的精度较低。该背景下,提出基于注入法的变电站直流电源接地故障检测方法。通过纳秒级高压脉冲发生装置向变电站直流电源注入脉冲信号,以注入脉冲信号的响应电流信号的分担系数轨迹特征为选线判据,提取脉冲响应电流信号,确定其分担系数轨迹特征,从而进行接地故障选线,实现接地故障检测。实验结果表明,设计方法检测变电站直流电源接地故障的正确率为95.37%,证明该方法效果较好。

The accuracy of traditional fault detection methods is relatively low due to the small changes in fault current that are difficult to detect.In this context,a direct current power grounding fault detection method based on injection method is proposed for substations.By injecting a pulse signal into the direct current power supply of the substation through an nanosecond level high-voltage pulse generator,the distribution coefficient trajectory characteristics of the response current signal of the injected pulse signal are used as the selection criteria.The pulse response current signal is extracted,and its distribution coefficient trajectory characteristics are determined to select the grounding fault line and achieve grounding fault detection.The experimental results show that the accuracy rate of the designed method in detecting direct current power grounding faults in substations is 95.37%,proving that the method is effective.