接带高耗能降压变电站35kV侧中性点采用小电阻接地的必要性

高耗能地区用户广泛采用电缆出线,在35k V系统出现单相接地时,因单相接地过电压烧坏设备的概率大大增加,为解决这一矛盾,35k V电缆线路的电力网中性点采用小接地电阻接地方式。这种方式对于降低系统过电压水平,提高系统可靠性有良好的效果。

In the area of high energy consumption, when the cable outlet is widely used in the 35kV system, the probability of burning the equipment is greatly increased because of the single-phase grounding overvoltage. In order to solve this contradiction, the neutral grounding point of the 35kV cable line is grounded by the way of small earthing resistance. This method has good effect on reducing the ov-ervoltage level of the system and improving the system reliability.