In this paper，the effects of the plasma washing on the characteristics of used shaded-pole motor and three phase induction motor are clarified. The plasma washing is superior in considered environment to other washing methods. Therefore，we make plasma washing on the used shaded-pole motor and three phase induction motor and compare the temperature rise and characteristics of the motors after the washing with before the washing. We washed the rotor and the stator of the motors. The characteristics differences of these motors are shown.

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Because of active introduction of IEC standards into the JIS standards and the viewpoint of the lightning protection，grounding systems are diversified. When grounding systems are considered from a viewpoint of a ground fault accident，one point need to be concerned is the influence of ground fault accidents on faultless circuits. Specifically，the potential rise of faultless circuits and unnecessary operation of earth leakage breakers should be concerned. It is thought that these phenomena by ground accidents depend on a grounding system adopted. However，there have been only a few studies into this point. Therefore，the authors built a high-voltage power receiving equipment to a test site, and the authors verified the difference in the phenomenon by the classification of grounding systems. This paper discusses the results of them.

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