中性点小电阻接地方式研究

Research on Neutral Grounding Mode with Small Resistance

中性点接地方式的选取和应用是提高配电网可靠性和经济性的重要举措。66 kV电网中,通常中性点采用不接地和经消弧线圈接地方式。随着电缆线路的增加,系统电容电流增大,短路时电缆烧损的几率增大,为快速切除故障线路,采用并联小电阻接地方式,配合相应的控制方式,降低短路时对系统造成的危害,保证66 kV电网安全运行。

The selection and application of neutral grounding mode is an important measure to improve the reliability and economy ofdistribution network. In the 66 kV network, the neutral point is grounded and grounded by arc suppression coil. With the increase of thecable line and the capacitor current the probability of cable loss increases when a short circuit for rapid removal of fault lines. Using aparallel low resistance grounding mode, with the corresponding control method, it reduce the harm to the system caused by the shortcircuit to ensure the safe operation of power grid 66 kV.