Electricity: electrical systems and devices – Safety and protection of systems and devices – Generator protective circuits
Patent
1978-07-26
1980-08-05
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Generator protective circuits
H02H 706
Patent
active
042165148
ABSTRACT:
A protective device for a brushless exciting device comprises: a signal transmitter for transmitting a signal that is applied between a neutral point of an armature winding of an AC exciting device and ground; a signal detecting circuit for detecting the signal transmitted from the signal transmitter; a signal comparator circuit for comparing the frequency of the signal taken from the signal detecting circuit with a predetermined frequency value to output a signal indicating the difference between them; and an abnormal fault detecting device which detects an abnormal fault in the output signal from the comparator and accordingly outputs a signal for the abnormal fault or indicates directly the abnormal fault. The abnormal fault detecting device may compare a pattern of the difference signal from the signal comparator circuit with predetermined signal patterns for various faults.
Mitsubishi Denki & Kabushiki Kaisha
Moose Jr. Harry E.
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