故障电阻对电弧接地故障的影响研究与仿真

Research and Simulation of Transient Characteristic Single-Phase Arcing Earth Fault in Neutral Point Ineffectively Grounded Power System

研究准确识别电弧接地故障特性问题。电弧接地故障是一个非常复杂的物理化学过程,涉及到的许多参数都是高度非线性时变的,很难进行精确的识别。传统的电弧模型是将故障引发的电弧等效为恒定阻值的电阻,但是上述模型不能准确地反映电弧间歇性接地时的暂态故障特性。为解决上述问题,提出了一种研究电弧特性的新方法 -阻变法。研究过程中充分考虑故障电阻对电弧接地故障特性的影响,然后在EMTP-ATP平台上构建了一个20KV小电流系统接地电弧模型。经过对大量仿真波形的分析表明,改进方法可以有效地反映接地电弧的性质,对电弧熄灭的理论研究具有一定的参考价值和指导意义。

Research exactly describing the fault feature of arc grounding. Arcing ground fault is a very complex physical and chemical process, many of the involved parameters are highly nonlinear time-varying, and it is difficult to make an accurate description. The paper proposed a new method to research arc characteristics for the problem mentioned above by changing the value of fault resistance. The effect of fault resistance on the arc fault resistance ground fault characteristics was considered during the study, and a 20kV small current system grounding arc model was built on the platform of EMTP-ATP. The experiment results show that the method can effectively reflect the nature of the ground arc, with a reference value and significance for theoretical study on the arc extinguishing.