新型谐振接地系统接地故障全补偿方法

Novel method of full compensation for grounding fault of resonant grounding system

针对传统消弧线圈无法补偿有功电流和抑制间歇性接地故障等难题,提出了一种谐振接地系统接地故障全补偿新方法。系统正常运行时,通过注入信号谐振精确测量系统对地绝缘参数,根据绝缘参数计算补偿元件值;当发生接地故障时,利用故障电流的相位选出故障相,然后在故障相的滞后相投入阻容性补偿元件,将故障相电压抑制为0,实现接地故障电流全补偿。仿真分析表明,所提方法不受过渡电阻影响,能快速抑制故障相电压,实现配电系统接地故障电流的全补偿,有效抑制间歇性接地故障,且操作简单可靠、成本低。

In order to solve the problems that the traditional arc suppression coil cannot compensate the active current nor suppress the intermittent-arc grounding fault,a novel method of full compensation for grounding fault of resonant grounding system is proposed. In the normal state of resonant grounding system,the values of compensation components are calculated based on the system insulation parameters precisely measured by injecting signal resonance. When single-phase grounding fault occurs,the fault phase is selected by the phase of the fault current. Then the resistance capacitive compensation components are put into the lagging phase of the fault phase,so that the fault phase voltage can be suppressed to zero and the grounding fault current can be fully compensated. The simulative analysis shows that immune to the transition resistance,the proposed method can quickly suppress the fault phase voltage,realize full compensation of the grounding fault current for the distribution system and effectively suppress the intermittent grounding fault,meanwhile,its operation is simple and reliable,and its cost is low.