Summary
It is necessary to enhance HVDC electrical insulation performance in power equipment such as SF6 gas insulated switchgear (GIS) for the introduction of distributed power supply and long distance power transmission systems in the future. HVDC electric field distributions are entirely different from those of AC applications and are characterized by charge behavior in gas-solid composite insulation systems. In this paper, electric field distributions of epoxy-spacer in SF6 gas are calculated under AC, DC steady-state, DC polarity reversal (DC-PR) conditions by the Finite Element method (FEM), while changing parameters, such as inclination angle and thickness of the spacer. In addition, we discussed the electrical insulation performance based on actual 500 kV GIS structure and quantitatively investigated the relationship between accumulated charge density under DC steady-state and electric field distributions at DC-PR conditions. As a result, we concluded that the electric field distribution, the maximum electric field and the locations are varied by the type of voltage applications. In addition, we clarified that the accumulated charges on a solid insulator surface under DC steady-state can be a critical parameter to determine the maximum electric field distribution at DC-PR conditions.
Additional informations
| Publication type | ISH Collection |
|---|---|
| Reference | ISH2017_247 |
| Publication year | |
| Publisher | ISH |
| File size | 993 KB |
| Pages number | 5 |
| Price for non member | Free |
| Price for member | Free |
Keywords
HVDC, DC-GIS, charge, polarity reversal, electrical insulation
