| Autor: |
Kurimoto, Muneaki, Yamashita, Yuu, Kato, Takeyoshi, Funabashi, Toshihisa, Suzuoki, Yasuo |
| Předmět: |
|
| Zdroj: |
Journal of International Council on Electrical Engineering; 2015, Vol. 5 Issue 1, p18-22, 5p |
| Abstrakt: |
For the size reduction of high voltage (HV) power apparatus, the electric field stress around solid insulators is to be considered carefully. The application of nanoporous composite insulator with lower permittivity will be an effective solution. This paper attempts to show the effective porous-structure of the nanoporous-alumina composite insulator for gas insulated switchgears (GIS) solid spacer by using numerical analysis. Finite element analysis indicates that the reduction of triple junction (TJ) field stress by more than 15% requires the relative permittivity of less than 4.7 in nanoporous- alumina composite insulator. From the dielectric mixture formula, it is estimated that effective permittivity of less than 4.7 of nanoporous-alumina composite insulator required the particle porosity of more than 15%. Based on the Paschen's law, it is estimated that the discharge inception field of a nanopore with a size of less than 0.02 μm could be higher than the dielectric breakdown strength of epoxy composite material, that is, the nanoporous-alumina composite insulator with a nanopore size of less than 0.02 μm could have the voltage-endurance. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
