G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/34 (2006.01) H02H 7/08 (2006.01) H02H 7/122 (2006.01) H02H 3/16 (2006.01)
Patent
CA 2160173
An apparatus detects a ground fault of an exciting circuit and a field circuit of an AC exciting variable speed rotating machine. The exciting circuit outputs an excited voltage controlled a frequency and/or an amplitude, and the field circuit of the AC exciting variable speed rotating machine is applied a field current by the excited voltage of the exciting circuit. A ground resistance is connected between a neutral point and a ground. The apparatus detects a current flowing from a ground to a neutral point through the ground resistance, and detects the ground fault based upon the detected current. Therefore, the apparatus can detect a ground fault of a field circuit and an exciting circuit of an AC exciting rotating machine during the AC exciting rotating machine operation with certainty.
Ishiguro Takashi
Takei Yoshinori
Kabushiki Kaisha Toshiba
Marks & Clerk
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