摘要
通过对变电站的无故障跳闸事故的调查分析,总结出变电站杂散电容对二次回路影响的一般规律。画出典型中间继电器跳闸回路的RC等效电路,根据现场试验测量数据,分析变电站的直流系统正负极接地故障、二次回路接地故障以及交直流混联故障;仿真出在各种故障情况下,中间继电器两端电压的暂态过程和动作情况。针对继电器的动作过程,提出减小二次回路杂散电容值和提高中间继电器动作可靠性的防范措施。
The general rule of the influence of substations＇ stray capacitance on secondary circuit is summarized by analyzing the trip accidents without any fault in substations. According to the RC equivalent circuit of auxiliary relay trip and the field-testing and measuring data, the DC system grounding fault, secondary circuit grounding fault and DC-AC hybrid fault are analyzed. The transient voltage and action situation of auxiliary relay are simulated in every fault. Aiming at the action process, the countermeasures of reducing the secondary circuit stray capacitance and improving the reliability of auxiliary relay are proposed.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第22期206-209,213,共5页
Power System Protection and Control
关键词
杂散电容
二次回路
中间继电器
直流接地
交直流混联
stray capacitance
secondary circuit
auxiliary relay
DC system grounding
DC-AC hybrid
