Ferroresonance-suppressing static transfer switch

H - Electricity – 02 – J

Patent

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H02J 9/06 (2006.01) H02J 3/38 (2006.01)

Patent

CA 2362163

A static transfer switch for reducing ferroresonance in a load consisting of a first switch for connecting and disconnecting a primary power source to and from the load, and a second switch for connecting and disconnecting a secondary power source to and from the load. Each switch includes a snubber circuit connected across the respective switch. An attenuator, consisting of a resistor in series with a capacitor, is connected between the first and second switches and ground and suppresses series ferroresonance at the load by reducing the voltage applied to the load when both the first and second switches are open and power is applied to or removed from the load.

Ce commutateur de transfert statique sert à diminuer la ferrorésonance dans une charge, et il se compose d'un premier commutateur, destiné à connecter à la charge une première source de puissance ou à déconnecter de la charge cette première source, ainsi qu'un second commutateur destiné à connecter à la charge une seconde source de puissance ou à déconnecter de la charge cette seconde source. Chaque commutateur comprend un circuit d'amortissement connecté à travers le commutateur correspondant. Un atténuateur, comprenant une résistance en série dotée d'un condensateur, est connecté entre le premier et le second commutateur et la terre, et il supprime la ferrorésonance en série au niveau de la charge en réduisant la tension appliquée à la charge lorsqu'à la fois le premier et le second commutateur sont ouverts et que la puissance est appliquée à la charge ou enlevée de celle-ci.

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