Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1979-02-14
1982-05-18
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361103, 340628, 73 28, 374152, H02H 504, H02H 708
Patent
active
043308082
ABSTRACT:
An electronic control system to automatically determine the validity of an apparent overheating signal from an overheat monitor of a gas-cooled dynamoelectric machine and reduce machine load or indicate a monitor malfunction. Upon receipt of an apparent overheat signal by the control system, filtration of the monitored cooling gas is automatically initiated to remove pyrolysates released into the gas by overheated elements within the machine. A normal monitor response is thereby effected, provided the overheat signal is valid. If filtration of the monitored cooling gas fails to elicit a normal response within a preselected time period a monitor malfunction is indicated. The control system initiates a scheduled reduction in machine load either subsequent to validation of overheating or as verification is initiated, and if a valid indication of overloading persists, trips the excitation and remaining load from the machine. Redundant current paths, high-speed solid-state comparators, and timing elements are included in the control system for verifying the monitor signals.
REFERENCES:
patent: 3427880 (1969-02-01), Grobel et al.
patent: 3573460 (1971-04-01), Skala
patent: 3702561 (1972-11-01), Carson et al.
patent: 3809960 (1974-05-01), Jossic
patent: 3812401 (1974-05-01), Radin
patent: 3916671 (1975-11-01), Carson et al.
patent: 3972225 (1976-08-01), Fort et al.
patent: 4072997 (1978-02-01), Boothmann et al.
Barton Sterling C.
Carson Chester C.
Echeverria Federico S.
Sawada Fred H.
Ahern John F.
Austin Ormand R.
General Electric Company
Salce Patrick R.
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