基于脉冲信号注入法的小电流接地选线技术

针对小电流接地系统的单相接地故障，提出基于脉冲信号注入技术的选线新方法。该方法属于可控周期性脉冲响应法，是一种主动探测算法，不需进行故障相的判别即可实现自动选线。文章还讨论了脉冲信号参数的选定和响应信号的提取过程，用Matlab/Simulink作为仿真工具建立了模型，通过对不同条件下各种接地故障情况的仿真研究，验证了该方法的可行性和正确性。

Pulse Signal Injection Based Faulty Line Detection for Small Current Neutral Grounding System

In this paper a new pulse signal injection based faulty line detection method, which belongs to controllable periodic pulse response method, is proposed for single-phase grounding fault occurred in small current neutral grounding system. The proposed method is an active detection algorithm, and using it the faulty line detection can be automatically implemented when the judgment of faulty phase is not needed. The selection of pulse signal parameters and the extraction of response signal are also researched. Using Matlab/Simulink software, a model for 10kV distribution network is built, and by means of the simulation for various grounding faults under different conditions the feasibility and correctness of the proposed method are validated.