用麦也尔电弧模型分析雷击引起的电压凹陷

雷击是当前电力系统面临的最严重的事故和故障原因。雷击在电力系统中产生过电压,该过电压如果超过电气设备的绝缘水平,就会导致系统故障,因此研究雷击引起的电压凹陷对于实际电力系统具有重要的理论价值和现实意义。侧重探讨配电网络由雷击引起的几种电压凹陷,即雷击引起的绝缘子闪络、保护间隙击穿续流、电弧接地引起的电压凹陷。由于电弧现象的复杂性,使得在以往的数字仿真中,仅仅用理想短路或者一个线性电阻来模拟接地故障电弧,大大降低了仿真结果的可信度。为解决这个问题,依据麦也尔电弧数学模型,给出了接地故障电弧的精确数字仿真模型。

Analysis of Voltage sag Caused by Lightning Stroke Based on Mayr Arc Model

Lightning stroke is the most serious accident and the cause of the malfunction in power system at present.Lightning stroke will generate overvoltage in power system,if the overvoltage exceeds the insulation level of electrical equipment,it will lead to system failures.So,it has an important theoretical value and practical significance of studying voltage sag caused by lightning stroke for the actual power system.It is focused on several voltage sags caused by lightning stroke in distribution network,that is,insulator flashover caused by lightning stroke,breakdown follow current of protective gap and voltage sag caused by arc grounding.Because of the complexity of the arc phenomenon,it will reduce the reliability of the simulation results greatly if the simulation of ground fault arc is done only with an ideal short circuit or a linear resistance in the past digital simulation.In order to solve this problem,the precise digital simulation model of ground fault arc is put forward based on Mayr mathematical model of electric arc.