电压切换回路设计缺陷及改进方法

Design Flaws in Voltage Switching Circuit and Its Correction

2007年11月3日中山局220kV小榄站全站失压,针对这次跳闸事故,分析了电压切换回路电压切换原理,指出电压切换回路的信号回路存在隐性缺陷,若运行方式变更.无法对信号"切换继电器同时动作"准确报警,给变电站二次系统稳定运行留下隐患。结合实际提出了电压切换回路的改进方法和维护注意事项。

In Nov. 3rd, 2007, a power loss occurred in Zhongshan Bureau＇s 220 kV Xiaolan Station. Aiming at this trip accident, the principles of voltage switching circuit are analyzed. It is suggested that there are hidden flaws in signal circuit of voltage switching circuit, so that when operation mode is changed, it is unable to give correct alarm on ＇switching relay action at same time＇, resulting in hidden trouble for secondary system operation. Correction and maintenance guidelines are presented for voltage switching circuit.