随调试消弧线圈接地选线方法研究

Study on Methods of System Faulty Line Selection in the Neutral Resonant Grounded System

我国中低压配电网广泛采用小电流接地方式,小电流接地方式中最具代表性和发展前景的中性点经消弧线圈接地方式的广泛应用,要求深入研究并解决该接地方式下的选线问题。本文通过分析对其中的小扰动法、五次谐波法、信号注入法以及能量法四种选线方法做了详细的讨论。并在建立了MatI ab仿真计算模型的基础上,对理论分析的结果进行了仿真验证,给出了仿真结果及线路各主要参数的仿真波形图。同时,也对各种方法存在的问题进行了分析讨论,总结了各种方法的适用性和优缺点。

Neutral ineffectively grounded modes are widely employed in medium and low voltage distribution networks of China. The situation that the neutral resonant grounded systems are mostly employed requires the thoroughly study on the ground fault detection in this mode.In this paper, it particularly discusses the small perturbation scheme, the signal injection scheme, the fifth harmonic scheme and the energy scheme in detail. And on the basis of establishing the Matlab simulation model, it validates the simulation results and makes a certification to the result of theoretical analysis, and presents the simulation results and the waves of primary parameters. At the same time, it analyzes and discusses the existence issue of the various methods. And then it sums up the applicability and the advantages and disadvantages of various methods.