不同接地方式下故障相电压恢复初速度的计算与仿真

Calculation and Simulation of Initial Velocity of Fault Phase Voltage in Different Grounding System

当电力系统发生单相接地故障的时候,故障相电压会由零恢复到峰值,而其初速度是决定电弧的重燃关键。本文模拟中压电力网络,简化其单相接地故障下的回路,计算出不同接地方式下,故障相电压恢复的初速度。本文运用PSCAD软件仿真分析,并用实验进一步的验证的仿真的过压波形,确定其可靠性。最后比较三种接地方式下的电压恢复初速度。

When single phase to ground fault occurs in the power system, the fault phase voltage varies by zero recovery to peak, while the initial velocity is the key to decide the reignition of arc. The paper simulates the medium voltage power network, simplifies circuit of the single-phase fault, and calculates initial recovery speed of fault phase voltage in different grounding system. The paper also uses PSCAD to analyze,and to verify the over-voltage waveform of simulation to determine its reliability. Finally, the paper compares recovery initial velocity of voltage in three kinds grounding modes.