Predictive control circuit and method for circuit interrupter

Details Predictive control circuit and method for circuit interrupter Predictive control circuit and method for circuit interrupter

1995-12-21

1998-08-11

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 87, H02H 300

Patent

active

057935947

ABSTRACT:
A control circuit and method are provided for a circuit interrupter that predicts the occurrence of fault-current zero crossings. This prediction is utilized to control the operation of a circuit interrupter at a desirable point in the periodic wave form of the fault current. For example, the control circuit is useful to control a synchronous interrupter by accurately generating a trip signal to the synchronous interrupter for operation in the vicinity of the zero crossing of the current wave form. In a preferred arrangement, the control circuit utilizes the quotient of a sensed current signal and the time rate of change of the sensed current signal. In one specific arrangement for circuit environments that might include conditions that could lead to false results, the time rate of change of the quotient is utilized to provide a control signal.

REFERENCES:
patent: 3808455 (1974-04-01), Leisi
patent: 4916573 (1990-04-01), Ruta

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