Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1982-08-02
1985-01-15
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361110, 361117, 361127, H02H 104, H02H 904
Patent
active
044941633
ABSTRACT:
An electric switching surge protector comprising a non-linear, voltage and frequency sensitive RC network connectable between earth and a phase of a switch controlled, AC electric load circuit. The RE network includes a linear resistance component; a non-linear resistance component connected in parallel with the linear resistance component and having a pre-determined knee-point voltage value; and a capacitance component connected in series with the parallel connected linear and non-linear resistance components. The capacitance component is operative to decouple the resistance components from the circuit at power supply frequency but to couple the combined resistive impedance of the parallel connected linear and non-linear resistance components effectively into the circuit under high frequency conditions. The capacitance component is further operative to increase the rise time of that portion of a steep fronted surge which exceeds the knee-point voltage value of the non-linear resistance component.
REFERENCES:
patent: 2246926 (1941-06-01), Roman
patent: 3532901 (1970-10-01), Hylten-Cavallius et al.
patent: 4156838 (1979-05-01), Montagoe
patent: 4271446 (1981-06-01), Comstock
"A Basic Guide to RC Surge Suppression on Motors and Transformers"-R. E. Pretorius et al.; Transactions of the South African Institute of Electrical Engineers, Aug. 1980.
"The Suppression of Internal Voltage Surges in Industrial High Voltage Systems"-R. E. Pretorius; The Certified Engineer, Jul. 1981.
"Optimised Surge Suppression on High Voltage Vacuum Contactor Controlled Motors"-R. E. Pretorius; IEE Conference on Sources and Effects of Power System Disturbances, London, May 1982.
Pretorius Rapha E.
Yelland Christopher P.
Moose Jr. Harry E.
Yelland Engineering (Proprietary) Ltd.
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