新型接地距离继电器的研究

On Several New Types of Ground Distance Relays

对几种新型接地阻抗继电器进行了仿真分析，综合现有Ｉ０极化继电器的优缺点，提出了一种Ｉ０和Ｉ２极化接地距离保护新方案．这种方案即使在系统参数未知的情况下，也能完全消除区外稳态超越，且能提高耐受过渡电阻能力．

Theoretical and detailed simulation investigations on several types of ground distance relays have been carried out. Based on practice, a new scheme using I 0 and I 2 polarized ground distance protection is proposed. The shortcomings of the earlier ground distance relays have been successfully overcome, and the new scheme is very likely to be applied to digitalized power protection. It is shown that foreign steady state overreaching can be completely eliminated and the ability to endure the transition resistance is improved even when the power system parameters are unknown.