一次输电线路故障的原因分析与案例研究

Causal Analysis and Case Study of Transmission Line Faults

针对新疆电网发生的几起证据模糊的输电线路故障,基于故障录波数据驱动进行了故障反演和故障原因分析。首先,根据故障录波电压电流特性,提取其长电弧故障特征。然后,考虑到污闪故障具有故障证据易缺失、记录稀少及多发于春季的特点,将其作为此次故障的首要考虑对象。最后,通过相量法计算故障电阻的时域特性,设置污闪故障的控制论电弧参数实现了对实际故障录波数据的反演,进而验证了假设故障为污闪故障。

With respect to several faults with ambiguous evidence encountered by transmission lines in Xinjiang power grid,the present work carried out fault inversion and causal analysis based on the fault recording data.First,the fault characteristics of long arc were extracted according to the voltage and current characteristics of the fault waveforms.Then,contamination-induced flashovers were regarded as the primary focus of fault record analysis,since they are characterized by easily missing fault evidence,sparse fault records,and more frequent occurrence in spring compared to other fault types.Finally,the time-domain characteristics of the fault resistance were obtained by using phasor method,and the fault inversion from the waveforms recording was achieved by determining control theory-based arc parameters,thereby validating the hypothesis of contamination-induced flashover fault.