Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1977-08-11
1979-05-29
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 92, 361 94, H02H 308
Patent
active
041568850
ABSTRACT:
An automatic current overload protection circuit for electrostatic precipitator power supplies of the type utilizing a ferroresonant transformer. A low voltage tertiary winding in association with the transformer provides an output voltage to a sensing circuit for inhibiting current flow into the primary of the transformer when the tertiary voltage falls below a predetermined threshold. Another output voltage developed in association with the high voltage secondary winding of the transformer is also utilized to independently inhibit current flow into the primary of the transformer when the secondary voltage falls below a predetermined threshold. A time delay may be provided to permit operation of the overload protection circuit only in the event of a sustained overload current condition.
REFERENCES:
patent: 3188784 (1965-06-01), Nodolf
patent: 3648437 (1972-03-01), Bridges
patent: 3699424 (1972-10-01), Hart et al.
patent: 3733538 (1973-05-01), Kernick et al.
patent: 3914685 (1975-10-01), Van Gilder
patent: 4005344 (1977-01-01), Gaind et al.
Baker Forester C.
Spurgin Wendell P.
Salce Patrick R.
United Air Specialists Inc.
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