Abstract
During the operation of DC cables, the electric field would be reversed due to the temperature gradient in the insulation layer and the negative temperature coefficient of resistivity of the insulation material, which arises the difficulties in the insulation structure design of DC cables. Based on the structural parameters of 100 kV DC cables and the theoretical analysis, the effect of temperature gradient, the temperature coefficient and electric field coefficient of resistivity on the electric field distribution is analyzed by computational simulation. A method based on nanocomposites technology to control the temperature coefficient of resistivity is proposed. The results show that reducing the temperature coefficient of resistivity of insulation material can effectively suppress the electric field reversal in DC cable insulation layer and reduce the maximum electric field during the operation of DC cables. The introduction of deep traps at the interfaces of nanoparticles and insulation matrix by nanocomposites technology can effectively suppress the decrease of resistivity of the insulation material at high temperature, thereby reducing its temperature coefficient of resistivity.
| Translated title of the contribution | Influence and Regulation of Insulation Material Resistivity on DC Cable Electric Field Distribution |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 155-160 |
| Number of pages | 6 |
| Journal | Gaoya Dianqi/High Voltage Apparatus |
| Volume | 56 |
| Issue number | 8 |
| DOIs | |
| State | Published - 16 Aug 2020 |
| Externally published | Yes |