Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 742-745 |
| Number of pages | 4 |
| Journal | Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report |
| Volume | 2 |
| Publication status | Published - 1996 Dec 1 |
| Event | Proceedings of the 1996 Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 2 (of 2) - Millbrae, CA, USA Duration: 1996 Oct 20 → 1996 Oct 23 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Industrial and Manufacturing Engineering
- Building and Construction