35kV消弧线圈的容量选择与计算

Capacity Selection and Calculation of 35 kV Arc Suppression Coil

针对35kV配电系统大量使用电缆出线造成的接地电容电流大幅增加问题,采用消弧线圈接地,消弧线圈产生感性电流补偿接地点的电容电流,减小接地电流,降低故障相电压恢复速度,使接地点电弧自动熄灭.结合工程实例计算35kV单相接地电容电流,为合理选择消弧线圈容量提供了参考.

In the 35 kV power distribution system, the cable outlet is adopted, and the large amount of cable makes the capacitive current of the system increase greatly. The arc suppression coil is adopted to ground, and the arc suppres sion coil generates inductive current to compensate the capac itive current of the grounding point, thus reducing the grounding current, reducing the recovery speed of the fault phase voltage and automatically extinguishing the grounding arc. Therefore, the reasonable selection of arc suppression coil capacity is particularly important to the distribution system. In this paper, the capacitive current of 35 kV singlephase grounding is calculated with an engineering example, and the arc suppression coil capacity is rationally chosen.