Abstract
The post spacer has been used to support the operation of 1000 kV DC Gas Insulated Transmission Line (GIL) for the ITER neutral beam injector. It was considered that the conductivity gradient design along the spacer surface notably suppressed the electric field distortion. In this paper, the electric field distribution of post spacer under 1000 kV dc voltage stress was analyzed and the surface conductivity gradient was applied to optimize the surface electric field distribution. The results indicated that the optimization method with surface conductivity gradient can uniform the electric field distribution along the surface of post spacer.
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