Toshiba Mitsubishi-electric Industrial Systems Corporation

Teruo Kanekawa

Yoshihiro Ishikawa

Tetsuo Yoshimitsu

Toshihiro Tsuda

Yuichi Tsuboi

A water-tree resistance evaluation material including: a material selection selecting a candidate insulation material; a test carrying out a water tree test on a test piece having electrode holes formed on a first surface; and a candidate insulation material evaluation evaluating characteristics of the candidate insulation material, including progress and speed of a water tree. The test includes: a system and condition setting for setting a test system; a voltage application for grounding a ground-side electrode that is immersed in the ground-side aqueous solution, while applying an AC voltage to an application-side electrode that is immersed in the application-side aqueous solution; a measurement step; and a period determination for determining whether a test period has exceeded a predetermined period.

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Tokyo, Japan

Teruo Kanekawa