摘要
分析了现有的检测直流系统接地故障方法存在的死区，包括绝缘监测装置发出接地报警 信号时最大接地电阻值，以及直流系统分布电容对变频探测原理查找接地故障的影响。建议用综合 判据，即通过检测正负极母线电压、检测正负极绝缘电阻、检测支路漏电流来监视及查找直流系统 接地故障。基于该判据的样机经现场试运行，性能良好。
The shortcomings of the present method for detecting earth fault in DC system are analyzed. The maximum earth resistance value is discussed while a warning signal is sent out from insulation monitoring apparatus, as well as effect of distributed capacitance on detecting earth fault in DC system by frequency conversion principle. The recommended synthesized criteria on monitoring and detecting earth fault in DC system are: detecting positive pole and negative pole bus voltages, insulation resistance and branch's leakage currents. The insulation monitoring apparatus based on the proposed synthesized criteria has been put into operation and has good performance.
出处
《电力系统自动化》
EI
CSCD
北大核心
1999年第16期47-49,共3页
Automation of Electric Power Systems
关键词
直流系统
绝缘检测
综合判据
漏电流
DC system insulation monitoring synthesized criteria
