配电网单相接地故障定位S信号法的研究

Research on Single Phase to Ground Faults Location in Distribution Network Based on Singal Injection

介绍了信号源的硬件结构和软件设计,分析了脉冲宽度(PWM)调制控制技术在该装置中的应用;高频的PWM信号激励逆变电源中2个开关管,输出端通过滤波得到具有很高稳定性的注入信号,产生频率恒定、电压可调的交流信号,使得信号探测器很容易探测到该信号。该信号源装置降低了高阻接地探测的难度,使故障定位的精度和可靠性都得到大幅提高。该方法可以地面检测,便于现场人员操作,显著缩短定位时间,提高定位效率,并通过实验验证了其有效性。

The hardware of the signal source and the software design is introduced. The application of PWM control technique in this hardware is discussed in this reference. The high frequency PWM signal excited a couple of breakers in the inversion source and then the output terminal will get highly stable injected signals by filtering and generate AC signal with invariable frequency and adjustable voltage, based on which the signal detector could easily detect the signal required. The proposed signal source device reduced the difficulty of high impedance to ground detecting and improved the accuracy and reliability of locating fault. The proposed technique allows the ground detecting and is convenient for engineers＇ operation. The locating fault time is deduced, the locating fault efficiency is improved and the validity of this method is proved by simulation and analysis.