【作者】 李颖华；

【导师】 戚宇林；

【作者基本信息】 华北电力大学（河北） ， 通信与信息系统， 2010， 硕士

【摘要】 在配电网单相接地故障定位中,由于水泥杆接地故障的存在以及导线分布电容的影响,使得C行行波法和交流注入法不能有效定位,直流定位方法解决了上述两种方法的盲区问题,其优点是不受导线分布电容的影响,缺点是信号不容易检测。本文对此方法做了原理性介绍,然后着重对系统装置的软件和硬件设计作了全面的介绍。故障定位装置包括直流信号源和直流信号探测器,信号源通过PWM实现调压,从而达到输出电流恒定的目的;信号探测器采用霍尔磁势平衡传感器检测注入信号,利用无线传输技术实现测量与显示的分离。更多还原

【Abstract】 In the distribution network fault location, because of the cement pole earth fault and the existence of the wire distribution capacitance makes the C type traveling wave method and the AC signal injection method can not work effectively. DC signal injection method solves the problem of the two methods’ blind area. The advantage of it is free from the wire distributing capacitance influence and the weakness is the signal would be difficult to detect. The paper introduces the principle of the method. Then the paper introduces the software and the hardware about the systemic equipment generally. The equipment of DC injection fault location includes DC signal generator source and a corresponding signal detector, DC signal generator source adjusts the voltage through PWM so as to achieve the purpose of output a constant current. The signal detector using magnetometive balance Hall sensor to detect the injected signal, and adopts wireless transmission technology to realize the separation of measurement and display.更多还原