Title :
Water-tree characteristics in low-density PE under simulated inverter voltages
Author :
Suzuki, H. ; Mukai, S. ; Ohki, Y. ; Nakamichi, Y. ; Ajiki, K.
Author_Institution :
Dept. of Electr. Electron. & Comput. Eng., Waseda Univ., Tokyo, Japan
fDate :
4/1/1998 12:00:00 AM
Abstract :
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
Keywords :
PWM invertors; insulation testing; polyethylene insulation; trees (electrical); low-density PE; power-frequency ac voltages; pulse-width-modulation inverter; simulated inverter voltages; simulated output voltages; single-frequency voltages; tree growth; tree propagation; water-tree characteristics; zero-crossing; Computational modeling; Computer simulation; Dielectrics and electrical insulation; Frequency; Polyethylene; Pulse width modulation inverters; Rail transportation; Testing; Trees - insulation; Voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
