H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/093 (2006.01)
Patent
CA 1160330
49,605 ABSTRACT OF THE DISCLOSURE A solid state load protection system having an inverse time delay circuit. 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 resis- tor which converts the current produced by the current sensing function to a voltage which is proportional to the current utilized by the load. Attached to the load resis- tor is an inverse time delay circuit which serves as an overcurrent and timing function. The overcurrent and timing functions monitors the level of voltage from the load resistor initiating a time-out sequence when the voltage across the load resistor, which is proportional to the current utilized by the load, exceeds a predetermined level for a predetermined period of time. The overcurrent and timing function utilizes two diode paths for prohibit- ing the charging or discharging of a capacitor during a normal or overcurrent condition, respectively. Encircling the connections to the capacitor is a guardband for mini- mizing impedances from associated circuitry which affect the timing of the inverse timing circuit. During an overcurrent condition, the capacitor charges up to a specific value initiating a trip signal which is sent to an output function. The output function upon receiving a trip signal causes a light-emitting diode to conduct and also deenergizes a contactor through which a current source is connected to a load.
401428
Conroy Ernest F.
Elms Robert T.
Oldham And Company
Westinghouse Electric Corporation
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