20 kV配电网的中性点接地方式及设备选型

摘要

The selection of 20kV distribution equipment involves the system neutral grounding mode. This paper analyzed that the 20kV distribution network adopted three kinds of operational modes including non-neutral grounding mode, grounding via arc suppression coil and grounding via small resistance. This paper gave the capacitance current calculation mode of distribution network and the selection scheme of distribution network equipment. During the process of 20kV distribution network upgrading and rebuilding, rational selection of neutral grounding mode is in favour of raising the continuity and validity of grid power supply.%20kV配电设备的选择与系统中性点接地方式相关.分析了20kV配电网采用的中心点不接地、经消弧线圈接地和经小电阻接地3种运行方式,给出了配电网中电容电流的计算方法及配电网设备的选择方案.在20 kV配电网升级改造中,选择合理的中性点接地方式,有利于提高电网供电的持续性和有效性.