Ngk Insulators, Inc.

Tomio Hayashi

Toshiyuki Kawaguchi

A rod-type insulator is provided with the optimum withstand voltage characteristics under a contaminated condition by selecting the ratio of the leakage distance per shed to the shed pitch to be between 3.8 and 5.0 and also selecting 4.5.ltoreq.l/p.ltoreq.6.0, where p is the distance between the adjoining sheds, i.e., the distance between a given point on the lower surface of one shed and another given point on the upper surface of the other opposing shed, and l is the leakage distance between the two points.

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Gifu, Japan

Tomio Hayashi