基于故障电弧方波曲线相似度的输电线路单端故障测距时域算法

Single terminal time domain fault location method based on the similarity of square wave for arc grounding fault

输电线路发生的故障大多是瞬时性故障,瞬时性故障的暂态电弧电压特性为单端故障测距的实现提供可能。基于Mayr电弧模型对故障电弧的暂态特性进行分析,指出故障相电弧故障点的时域暂态方波曲线特征;为将故障电弧特性应用于单端故障测距,提出了输电线路沿线电压的方波曲线相似度评价指标。在此基础上,基于Bergeron输电线路时域传输方程,利用测量端电气量,推算输电线路沿线观测点故障相的瞬时计算电压,并对沿线各观测点的故障相计算电压进行方波曲线相似度评价,通过比较各观测点的相似度指标选取故障点。最后,基于ATP/EMTP建立输电线路故障仿真模型,通过大量的仿真分析验证所提方法的正确性。

Transmission lines are subject to faults, and most of them are temporary faults. The transient voltage characteristics of temporary faults provide a new way to deal with the single terminal fault location method. Based on the Mayr arc model, this paper analyzes the transient characteristics of arc grounding fault and proposes the similarity of square wave for arc grounding fault. Then, based on the Bergeron transmission line time domain equations, this paper constructs the time domain equations of voltage along a transmission line based on single terminal data. Combining with the proposed similarity of square wave method, the single terminal time domain fault location method for arc grounding fault is proposed. Finally, based on the ATP/EMTP, the transmission line fault simulation model is constructed. And a large amount of simulation is used to verify the proposed fault location method.