摘要
分析了矿用中性点不接地变频调速系统对地绝缘电阻的基本要求,分析了目前较为常见的漏电闭锁保护的原理与保护方法。在此基础上介绍了在线监测漏电保护的原理与方法,详细阐述了低频脉冲注入法的难点,进一步分析了漏电保护发展方向。
Analyzed the basic requirements for ground insulation resistance of the mine-used neutral point ungrounded variable-frequency speed-regulation system, and analyzed the principle and protection methods of the current more common leakage lock protection. On this basis, the principle and method of the online monitoring of the leakage protection were introduced. Elaborated the difficult points of low-frequency pulse injection method in detail, and further analyzed the development direction of leakage protection.
作者
黎青
Li Qing(Tiandi Shanghai Mining Equipment Technology Co.,Ltd.,Shanghai 201403,China;Shanghai Branch,Tiandi Science and Technology Co.,Ltd.,Shanghai 200030,China;Shanghai Co.,Ltd.,China Coal Technology and Engineering Group,Shanghai 200030,China)
出处
《煤矿机械》
2021年第11期137-140,共4页
Coal Mine Machinery
基金
中煤科工集团青年基金项目(2018QN038)。
关键词
矿井
电网
变频调速
漏电保护
采煤机
绝缘电阻
coal mine
power network
variable-frequency speed-regulation
leakage protection
shearer
insulation resistance
