Electroquasistatic Field Simulation for the Layout Improvement of Outdoor Insulators Using Microvaristor Material

A possible solution to locally reduce the high electric-field stress along the surface of outdoor insulators is to use the resistive field grading materials such as zinc–oxide microvaristor polymer compounds. This material is nonlinearly semiconductive and its conductivity depends on the electric-field intensity. In this paper, the field control effect of this material is demonstrated. Different configurations in order to optimize the layout of this material are compared. A case study is carried out for a 765-kV outdoor large-scale long rod polymeric insulator using different layouts of the microvaristor material. Electroquasistatic simulations are performed to evaluate the tangential electric-field distributions along the surface of the insulator for the dry clean surface condition and with a few single water droplets on the surface.

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