摘要
揭阳１１０ｋＶ 榕城变电站１０ ｋＶ粮食线二次回路曾发生投退直流控制电源小保险时，引起相邻线路开关误跳闸的事故。通过分析讨论，得出按周减载四路缺少负极小母线和直流系统存在接地点是造成这种事故的主要原因。提出了给按周减载回路力。装二级管、加强直流系统的维护管理和规定投退小保险的操作顺序等反事故措施。最后，提出从根本上杜绝事故发生的建议，即以微机线路保护装置取代小母线式旧装置。
Switching of mini fuses in secondary circuit may occasionally cause miss-trip of switches of multiple adjacent lines. It is concluded through analysis that this kind of failure mainly results from the absence of negative small busbar in frequency-based load-shedding circuit and the defects in DC system. The author puts forward some anti-fault measures including adding diodes to frequency-based load-shedding circuit, enhancing the maintenance and management of DC system, and setting the switching sequence of mini fusec. It is also pointed out that using microcomputer-based line protective devices is a way to the thorough end of such failures.
出处
《广东电力》
2000年第1期11-13,共3页
Guangdong Electric Power
