Dual voltage power supply

Details Dual voltage power supply Dual voltage power supply

H - Electricity

02

H

H02H 9/04 (2006.01) H02H 1/06 (2006.01)

Patent

CA 2122259

For use in a trip unit, a switched current shunting arrangement in a circuit interruption tripping system couples the current transformers (A, B, C, G, F) to relatively low voltage and it accumulates a high level of energy quickly at power-up so that the tripping solenoid (128) can promptly be energized after the detection of a spurious fault condition. The arrangement regulates supply current from the current transformers to a trip voltage capacitor (78) and to a supply capacitor (20') at the input of a voltage regulation circuit. The current transformer charges the trip voltage capacitor to a first prescribed voltage level, and a current shunting circuit (142, 144) shunts current passing from the current transformer to the supply capacitor, such that during normal operation the supply capacitor is charged to a second prescribed voltage level, which is less than the first prescribed voltage level.

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