For magnetic levitation railway systems using linear synchronous motors, pulse-width-modulation inverters and polymer insulated cables are used for driving cars and feeding electricity, respectively. This implies that ac voltages with many harmonics induced by inverters are applied to cables. However, little is known about dielectric properties of polymers under such ac voltages. Therefore, water-tree characteristics have been investigated for low-density polyethylene using power-frequency ac voltages with high-frequency components. It was found that water tree grows very fast under high-frequency voltage. However, in the case of the superposed voltage, water tree does not grow so fast if the high-frequency component is not large. It is considered that the zero-crossing of the applied voltage plays an important role for the tree growth.
|ジャーナル||Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report|
|出版ステータス||Published - 1996 12 1|
|イベント||Proceedings of the 1996 Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 2 (of 2) - Millbrae, CA, USA|
継続期間: 1996 10 20 → 1996 10 23
ASJC Scopus subject areas