基于故障录波数据的分布式电网故障诊断系统

介绍了一种基于故障录波数据的分布式电网故障诊断专家系统。系统由主站和若干子站构成。安装在变电站的子站系统负责故障初判 ,确定事故起因和相别 ,形成故障简报并向主站上传 ;安装在调度中心的主站系统综合多个子站信息 ,对事故情况进一步分析 ,并对开关和保护的动作做出评价并给出相应对策。系统综合利用故障录波、SOE以及保护事件等故障信息 ,采用基于CLIPS的故障诊断专家系统引擎 ,保证诊断结果快速可靠 ,动作评价深入 ,可大大减轻运行人员的工作量

Analysis on the equivalent circuit of grounding equipments at the neutral of power generator

This paper analyzes the effect of different equivalent circuits of grounding equipment at the neutral on the protection of ground fault by injecting signal, and points out that the accuracy of protection scheme using admittance is reduced if the leakage reactance and exciting impedance of grounding transformer or extinguishing coil ignored. The accuracy of calculating transient resistance and the sensitivity of protection can be improved by considering these parameters. The experimental results verify the influence of parameters of grounding equipment.