配电系统高压熔断器熔断的原因及应对措施

配电系统发生单相接地故障,引发高压熔断器熔断,从铁磁谐振产生过电压和电容在接地过程中充放电产生低频饱和电流两方面分析得出,导致配电系统高压熔断器熔断的主要原因有二:一是由于系统发生单相接地故障时,引发铁磁谐振产生过电压,最终导致高压熔断器熔断;二是当配电线路长度较长时,单相接地故障恢复后的电容放电,其产生的低频饱和电流过大造成高压熔断器熔断。

Cause Analysis of High-voltage Fuse Blow in Power Distribution System and Its Countermeasures

Single-phase ground connection failure cause to high-voltage fuse blow in power distribution system.Analysis on the reason of high-voltage fuse blow from ferroresonance causing overvoltage and charging or discharging of capacitance in process of connecting the earth causing low-frequency saturation current.And conclude two main reasons that lead high-voltage fuse to blow in power distribution system: First,because of system-to-ground fault,Ferroresonance have caused over-voltage,lead to high-voltage fuse blow eventually.The second is when the length of a distribution line long,the single-phase-to-ground fault recovery after the capacitance discharge,the low-frequency saturation currents cause excessive high-voltage fuse blow.