The simulations show that a clean low capacitance insulator yielded a pure sinusoidal current waveform, whereas that of a high capacitance yielded an oscillating sinusoidal current waveform. On the other hand, the polluted insulator simulations produced distorted sinusoidal current waveforms. At the end, the polluted insulator with dry-band discharge simulations showed chopped sinusoidal current waveforms. It was also showed the harmonic amplitudes, where third harmonics were usually the second highest amplitudes, a part of the fundamental ones.