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- W4387039078 abstract "The dielectric performance of a vacuum interrupter (VI) is a critical parameter for protecting the electrical grid against overvoltages and for a reliable application. A common approach is to minimize the maximum field stress in the VI for the freestanding case. This article demonstrates how the vapor shield potential determines the maximum electric field stress in the system. The importance of a capacitive coupling between the shield and the ground is highlighted and it is demonstrated how increasing this coupling leads to an increase of the electric field intensity around the contacts. This coupling leads to symmetry breaking of the VI versus voltage feeding direction, calling for a careful design optimization using the voltage applied from both fixed and moving contact side. The strategies to minimize the negative influence of a ground coupling are presented. Finally, experimental evidence is provided using lightning impulse tests which demonstrates that increasing the ground coupling strength leads to an enhanced dielectric breakdown probability. This study deepens the knowledge on the dielectric performance of a VI and the influence of the ground proximity, which is relevant for design of compact gas insulated switchgears containing VIs." @default.
- W4387039078 created "2023-09-27" @default.
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- W4387039078 date "2023-01-01" @default.
- W4387039078 modified "2023-09-27" @default.
- W4387039078 title "Symmetry breaking due to capacitive ground coupling in a vacuum interrupter" @default.
- W4387039078 doi "https://doi.org/10.1049/icp.2023.0323" @default.
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