Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1981-04-27
1983-11-08
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 94, 361 96, H02H 3093
Patent
active
044146019
ABSTRACT:
A solid state load protection system whereby the current supplied to a load is monitored enabling a test feature to be used. A current sensing function is utilized so as to produce an output current which is proportional to the current in an electrical circuit. Attached to the current sensing function is a load resistor module which converts the current produced by the current sensing function to a voltage which is also proportional to the current utilized by a load. Attached to the module is an overcurrent and timing function and an output function. The overcurrent and timing function monitors the level of voltage from the load resistor module initiating a timeout sequence when the voltage across the load resistor function, which is proportional to the current utilized by the load exceeds a predetermined level for a predetermined period of time thereby initiating a trip signal to the output function which deenergizes the motor by disconnecting it from its source of power. Upon the removal of the load resistor module and all other modules the input impedance of the overcurrent and timing function becomes very high allowing the test function to simulate an overcurrent condition in a load by causing a higher voltage to appear at the overcurrent and timing function and after a predetermined period of time, initiates a trip signal to the output function. The output function upon receiving a trip signal allows a light emitting diode to conduct and also deenergizes a contactor through which a current source is connected to the load.
REFERENCES:
patent: 3602783 (1971-08-01), Engle et al.
patent: 3818275 (1974-06-01), Shimp
patent: 3996499 (1976-12-01), Gary et al.
patent: 4021703 (1977-05-01), Gary et al.
patent: 4060844 (1977-11-01), Davis et al.
Eisenzopf Reinhard J.
Moran M. J.
Westinghouse Electric Corp.
LandOfFree
Solid-state load protection system having a test feature does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid-state load protection system having a test feature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid-state load protection system having a test feature will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2012066