行波特征鉴别式距离保护原理的研究

A Distance Protection Scheme Based on Travelling Wave Characteristics Recognition

本文对输电线路故障行波特征进行了分析,提出了行波特征鉴别式距离保护的方案,并进行了计算机仿真分析和单相模型继电器的模拟试验。该方案具有超高速动作、功能完善、保护区较稳定和抗干扰能力较强等优点。

This paper analyzes the characteritics of fault transient travelling waves on a single phase transmission line. Then the characteristics of travelling waves propagation on the three-phase transmission line are studied using the method of modal analysis. A new distance protection scheme is presented. First the fault type and phases are recognized and a backward travelling wave singnal is combined. Then the fault direction and distance are determined by recognizing the characteristics of combined singnal. The proposed algorithm has been tested by numerical simulation using a electromagnetic transient program of a typical 500kV system based on improved Bergeron method. The experiment of a single phase relay protype was made, which proved the correction of proposed algorithm.