Charge transport in thermally and electrically stressed oil-impregnated paper insulation
| Autor: | Yanchao Sha, Licheng Lu, Chao Dai, Weijiang Chen, Meng Huang, Yuanxiang Zhou |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Field (physics) Condensed matter physics business.industry Electrical engineering Charge (physics) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Space charge Cathode Anode law.invention Stress (mechanics) law Electric field 0103 physical sciences Charge carrier Electrical and Electronic Engineering 0210 nano-technology business |
| Zdroj: | IEEE Transactions on Dielectrics and Electrical Insulation. 23:266-274 |
| ISSN: | 1070-9878 |
| DOI: | 10.1109/tdei.2015.005375 |
| Popis: | The relation between ageing and space charge is a hot area, but there is little direct evidence. In this paper, oil-paper samples were exposed to 20-kV/mm DC electrical field, 130°C temperature or both 20-kV/mm DC electrical field and 130°C temperature separately. Charge transport through them was analyzed at intervals by the pulsed electroacoustic (PEA) method. We find that the quantity of trapped charge increases with stressing durations, no matter what kind of stress oil-paper is exposed to. That indicates that energy release through space charge movement, such as charge trapping/detrapping and recombination, is another reason for traps generation besides deterioration caused by thermal ageing. However, because the difference in cellulose degradation mechanism among them, charge transport dynamics are thereby different under different stressing conditions. Space charge accumulates faster inner electrothermally stressed oil-paper than that inner another two kinds of oil-paper, and the sign of trapped charge is positive if oil-paper is electrically or electro-thermally stressed. The latter behavior is discussed in terms of electromagnetic dynamics due to cavity within oil-paper once there is external electric field. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|