Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Patent
1995-10-06
1997-11-25
Karlsen, Ernest F.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
324545, 324772, 361 42, G01R 3106, H02H 706
Patent
active
056916434
ABSTRACT:
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.
REFERENCES:
patent: 3831160 (1974-08-01), Cronin et al.
patent: 4580186 (1986-04-01), Parker et al.
patent: 4589048 (1986-05-01), Takata
patent: 4667262 (1987-05-01), Maier
patent: 5214575 (1993-05-01), Sugishima et al.
Ishiguro Takashi
Takei Yoshinori
Do Diep
Kabushiki Kaisha Toshiba
Karlsen Ernest F.
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