Water tree characteristics have been investigated for low-density polyethylene by applying power-frequency ac voltages with high-frequency components, which are simulated output voltages of a pulse-width-modulation inverter. If we compare the water-tree length among single-frequency voltages, the water tree grows faster if the frequency is higher. However, if we superpose a power-frequency voltage on the high-frequency voltage, tree growth is suppressed. The tree length becomes shorter if the superposed power-frequency voltage is higher. This surprising result is explainable by considering that the zero-crossing of the applied voltage plays an important role in tree propagation.
|Number of pages||5|
|Journal||IEEE Transactions on Dielectrics and Electrical Insulation|
|Publication status||Published - 1998 Dec 1|
ASJC Scopus subject areas
- Electrical and Electronic Engineering