介绍一种基于注入法原理进行低压树状配电网接地故障定位的新装置。装置由恒流信号电源和信号检测装置两部分组成。在恒流信号电源部分控制系统的设计中采用了闭环PID直流反馈控制和引入了非线性环节 ,因此能在负载大范围波动的情况下保持注入电流频率恒定和幅值恒定 ,可靠性高。信号检测部分采用了编码、高阶滤波等技术。该装置工作可靠、灵敏度高、抗干扰性强、携带方便且操作容易 ,能广泛适用于复杂树状配电网的故障检测 A new device based on the principle of injection method is introduced to locate the ground fault in LV distribution network. The device consists of constant current signal power and signal detection device composed of two parts. The closed-loop PID direct-current feedback control and the introduction of non-linear links are adopted in the design of the control system of constant-current signal power supply. Therefore, the injection current can be kept constant in frequency and with high reliability under the condition of wide load fluctuation. Signal detection part of the coding, high-end filtering and other technologies. The device is reliable, high sensitivity, strong anti-interference, easy to carry and easy to operate, can be widely applied to the fault detection of complex tree distribution network