摘要
分析了煤矿现有井下低压漏电保护的选择性和漏电电阻检测原理,指出了现有漏电电阻检测原理是造成漏电保护装置误判的主要原因,并提出一种新的漏电电阻检测原理"零序电压修正法"。该原理响应速度和检测精度均能满足总开关和支路开关的要求,按该原理的漏电保护装置在煤矿实际应用中取得了很好的效果。
Analyzes the current selection of leakage protection and the theory of leakage resistance detection in low voltage at underground mine. It also points out the misjudgment made by the leakage protection equipment results from the current detection theory. Hence proposes a new theory, which is named ＂method of zero sequence voltage correction＂. Its respond speed and detection accuracy are good enough to ensure both of master switch and branch switch properly. Based on this theory, the equipment performs excellent work in practice.
出处
《煤矿机电》
2013年第3期66-67,71,共3页
Colliery Mechanical & Electrical Technology
关键词
低压
漏电保护
漏电电阻
零序电压
low voltage
leakage protection
leakage resistance
zero sequence voltage
