小波变换在超高压线路单相接地故障类型判别中的应用

分析了“永久性”与“瞬时性”两种故障下故障相电压的特点，对不同类型的线电路故障进行了电磁暂态程序数值仿真，通过对故障相电压信号的小波分解，两种故障下电压信号的小波变换有较大的差异。可以较好地识别两种故障。

Single-Phase-to-Ground Fault in Extra-High-Voltage Lines

The two types of single phase to ground faults in extra high voltage lines are identified as temporary and permanent. The faulty phase is studied before isolating it from both terminals. Calculations are made for different line types, using wavelets transform to decompose the faulty phase voltage into the two aforementioned types.