Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1981-02-26
1984-06-05
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361100, H02H 324
Patent
active
044531923
ABSTRACT:
In accordance with the present invention a three phase voltage sensor senses the presence of all three phases of the voltage to be applied to a three phase inductance. If all three phases are present, a gate member such as a triac or quadrac remains in the closed positon permitting the voltage to be applied to the three phase inductance. If all three phases are not present, the gate member moves to the open circuit position preventing application of the voltage to the three phase inductance until all phases are supplying voltage. The preferred three phase voltage sensor is at least one optical isolator which senses the presence of all phases in the power supply. Preferably a pair of optical isolators are used in parallel with the voltage across any two of the phases being applied to one of the optical isolators. Preferably the optical isolator contains a photo-resistive material which has low resistance in the presence of light, and a lamp. If all three phases are present, the lamp lights, and lowers the resistance of the photo-resistive material. The gate member remains in the closed circuit position to apply all three phases to the three phase inductance. However, if the input voltage is not applied to one or more phases of the three phase voltage input, the lamp does not turn on and the resistance of the photo-resistive material remains very high. In this event the gate member moves to the open circuit position and no voltage is applied to any of the phases of the inductance.
REFERENCES:
patent: 2759177 (1956-08-01), Hightower
patent: 4027204 (1977-05-01), Norbeck
patent: 4065804 (1977-12-01), Rostad
patent: 4156885 (1979-05-01), Baker et al.
patent: 4238811 (1980-12-01), Fry
ACF Industries Incorporated
Cummings Henry W.
Eisenzopf Reinhard J.
Muller J. Joseph
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