发电机暂态过电压统计分析

Statistic Analysis of Transient Over-voltage for Generator

电力系统中旋转电机随时都可能受到来自电网中的各种暂态电压的冲击,进而危害发电机绝缘安全。以13.8 kV发电机过电压监测数据为例,通过理论分析和大量的统计计算,得出了一年中侵袭发电机各种过电压分布情况。针对操作过电压侵袭发电机的频繁性和危害的严重性,对操作过电压进了详细的统计分析,得出了三相对地操作过电压幅值倍数的概率分布。

Rotating electrical machine is often subjected to the invasion of different transient over- voltage in power system, and then it can damage the security of generator insulation. Taking the over- voltage data monitored in 13.8kV generator for example, after a large work of theoretical analyses and calculations, the distribution of different over- voltage in a year is obtained. Furthermore, after the detailed statistic analyses of switching over- voltage, the probability distribution of amplitude of three - phase switching over- voltage is obtained.