Abstract
In this paper, by using the Finite Element Method (FEM), electric field and charge density distributions of epoxyspacer in actual 500 kV DC gas insulated switchgear (DC-GIS) structures are calculated, while adjusting parameters such as inclination angle and thickness of the core-spacer. In addition, we discussed the electrical insulation performance under AC, DC steady-state, and DC polarity reversal (DC-PR) testing conditions based on actual 500 kV DC-GIS structures. As a result, 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. Further more, we concluded that the electric field stress on the electrode surface of the spacer at DC-PR testing conditions has the severest impact on electrical insulation performance among the other tested conditions.
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