Sharp Kabushiki Kaisha Corporation

Ryohji Matsui

Hiroshi Kawamura

Katsuhiko Satoh

A ground fault detection apparatus is an apparatus detecting a ground fault in an ungrounded AC circuit in which a single-phase three-wire AC power source is connected to a load via a U phase wire, a neutral wire, and a V phase wire, including two resistive elements having an identical resistance value, one terminals of the two resistive elements being connected to the U phase wire and the neutral wire, respectively, the other terminals thereof being connected to each other. The ground fault detection apparatus further includes a current detector detecting a value of a current flowing between the other terminals of the two resistive elements (i.e., a node N) and a ground point. In a case where the absolute value of the current exceeds a threshold value, the ground fault detection apparatus determines that a ground fault occurs.

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Osaka, Japan

Ryohji Matsui