Patent ID: 6069781
Filing Date: 2000-05-30
Classification: H02H

Abstract:
A voltage surge protection device adapted for suppressing a transient voltage surge on at least one line of three lines configured for carrying power from a medium voltage three-phase delta power supply, the device comprising:a first connector having a first terminal connected to a first line of the three lines carrying power from the medium voltage three-phase delta power supply;a first circuit comprising a first capacitor, a first varistor, and a first gas tube connected in parallel between a second terminal of the first connector and an ungrounded common bus;a second connector having a first terminal connected to a second line of the three lines carrying power from the medium voltage three-phase delta power supply;a second circuit comprising a second capacitor, a second varistor, and a second gas tube connected in parallel between a second terminal of the second connector and the ungrounded common bus;a third connector having a first terminal connected to a third line of the three lines carrying power from the medium voltage three-phase delta power supply; anda third circuit comprising a third capacitor, a third varistor, and a third gas tube connected in parallel between a second terminal of the third connector and the ungrounded common bus.