摘要
单相接地故障仍是矿山电网的主要事故形式。随着矿井现代化的发展 ,电缆网络逐步扩大 ,系统电容电流大幅度增加 ,单相接地电容电流是影响电网安全供电的主要因素之一。由于接地过渡电阻的不同、电网电容的变化、其故障电流、中性点对地电压偏移 ,各相对地电压等都同时发生相应变化 ,其数值的变化规律对系统的运作均产生不可忽视的影响。采用中性点自动跟踪补偿消弧装置接地方式可限制电容电流和弧光接地过电压 ,较好地解决了人身及设备的安全问题。
Single-phase grounded failure is still the main reason of mine power-net fault.Along with developing of mine modernization and expanding of its electrical cables networks,the system capacitive current become more great,and the single-phase grounded capacitive current become the main interference with power system stability.Because of the differ of the transit-resistance to ground and the change of capacitance of power networks,the failure current,centre-point voltage offset to ground and each phase voltage changes simultaneously.These changes will affect the system operation.The solution is grounded the avoiding-arc device which has ability of centre-point auto tracking-compensation,which can restrict capacitive current and grounded arc-over-voltage make equipments and human safer.
出处
《煤矿机械》
北大核心
2004年第1期103-105,共3页
Coal Mine Machinery
关键词
矿山电网
配电电缆
单相接地
电容电流
自动跟踪补偿消弧
安全
mine power-net
power supply cable
single-phase grounded
capacitive current
auto tracking-compensation avoiding-arc
safe
