Polarity effect of water treeing using new water electrode method

In this study, we investigate the polarity effect of water treeing, as a first step toward applying an inverter waveform, in cross-linked polyethylene using a new water electrode method. The results show that water trees under the application of a positive full-cycle rectified voltage propagate considerably further than those under the application of a negative full-cycle rectified voltage or an ac voltage. Therefore, it is clarified that there is a polarity effect on water tree propagation. Moreover, it is also clarified that the effect of dc bias is small.