H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/26
H02H 3/16 (2006.01) H02H 3/00 (2006.01) H02H 3/08 (2006.01) H02H 3/093 (2006.01) H02H 3/10 (2006.01)
Patent
CA 1161938
636 ABSTRACT OF THE DISCLOSURE A circuit breaker having a latching mechanism for opening breaker contacts, and a solenoid for releasing the mechanism upon overload, includes means for sensing current through a circuit subject to interruption by the breaker. The sensed current is converted to a voltage proportional thereto. A current rating plug and recepta- cle system, responsive to the proportional voltage, pro- vides a standardized voltage. The proportional voltage is applied across a resistor in series with parallel con- nected permanent shunt resistor and replaceable plug resistor. The standardized voltage is obtained across the parallel connection. A peak detector provides an approximate true peak value voltage of the standardized voltage. An instantaneous trip circuit, including a threshold detector compares the approximate peak value voltage with a preset threshold value and, when it equals or exceeds the preset threshold value, a trip signal is generated. A long term delay circuit squares the approximate peak value voltage. The squared approximate peak value voltage is compared with a reference voltage. A voltage controlled oscillator is responsive to a signal applied to a voltage controlled oscillator when the squared approximate peak value voltage exceeds the reference voltage. A pulse counter is coupled to the voltage con- trolled oscillator for providing a trip signal when a predetermined count is achieved. The pulse counter is reset when the squared approximate peak value voltage ceases to exceed the reference voltage. A short term delay circuit means compares the approx- imate peak value voltage with a reference voltage. Similarly, a separate voltage controlled oscillator is responsive to a signal applied to a separate voltage controlled oscillator when the approximate peak value ,636 voltage exceeds the reference voltage. A separate pulse counter provides a trip signal upon achieving a predeter- mined count, and is reset when the approximate peak value voltage ceases to exceed said reference voltage. Upon detecting a ground fault condition, a trip sig- nal is provided. Upon the presence of any trip signal applied thereto, an OR circuit provides a control signal to the gate of an SCR. A thermal switch is coupled across an anode and a cathode of the SCR. A supply voltage is applied across a serial connection of the anode, the cathode., and the solenoid.
393835
Chen Wen T.
Oxley Vincent C.
Gte Laboratories Incorporated
R. William Wray & Associates
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