对中压配电网中性点接地方式的研究

分析了武汉地区中压电网中性点接地方式的现状，包括经消弧线圈接地、小电阻接地及不接地方式。在电力系统中，应根据配电网的绝缘水平，电网电容电流的大小选择不同的接地方式。对于以电缆线路为主的城市栩电网，电容电流超过100A时，中性点应以低电阻接地方式为宜。以架空线为主的配电网，一般采用中性点经消弧线圈接地方式。对一些重要枢纽变电站，运行方式变化频繁，中性点与电容电流超过50A时，应采用低电阻接地方式。

Research of neutral point grounding modes in MV distribution network

The current states of neutral point grounding modes applied in Wuhan regional MV distribution network are investigated,which include compensation coil grounding system,low resistance grounding system and un grounding system.The grounding mode should be determined according to the insulation level and electric capacity currents of the distribution network.For urban distribution systems mainly consisting of cables,the low resistance grounding mode should be adopted when the capacitor current excesses 100 A,whereas the systems mainly consisting of overhead lines,the compensation coil grounding mode is widely used.For key transformer substations whose operation mode varies frequently,the low resistance grounding mode should be adopted when the electric capacity current excesses 50 A.