基于配电自动化的配网单相接地故障定位与自愈

Location and self-healing of single-phase grounding fault based on distribution automation

多数配电自动化系统仅具备相间短路故障自愈功能,对单相接地故障缺乏有效的处理手段。在此背景下,针对中性点非直接接地的配电网提出将小电流故障选线装置接入配电自动化系统,在发生单相接地故障时,通过线路上智能开关的分合控制及单相接地报警信号的时序逻辑来判断故障区间,并通过配电自动化系统隔离故障区域,恢复非故障区域供电,实现配电网单相接地故障自愈。最后通过试验验证策略的有效性和必要性。

Aiming at the non-directly grounded distribution network of neutral point,this paper proposes to connect the small current fault line selection device to the distribution automation system.When a single-phase ground fault occurs,through the on-off control of the intelligent switch on the line and sequential logic of single-phase grounding alarm signal to determine the fault interval.Then the method isolates the fault area through the distribution automation system,restores the power supply in the non-fault area,and realizes the single-phase ground fault self-healing of the distribution grid.In the end,this paper verifies the effectiveness and necessity of this strategy by experiments.