Ground fault detector for gas discharge tubing

H - Electricity – 02 – H

Patent

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Details

H02H 3/16 (2006.01)

Patent

CA 2225888

A ground fault circuit comprising: a power supply, and a transformer having a primary winding driven by the power supply and a high voltage secondary winding, a shutdown control circuit having a controllable switch and a control input coupled to the controllable switch for causing operation of the controllable switch when a trigger voltage applied to the control input is exceeded, the shutdown control circuit being coupled to the power supply for controlling shut-down of the power supply when the switch is in operation, a circuit connected to the high voltage secondary winding for detecting leakage current from the transformer to ground, for short circuiting an A.C. component of the leakage current passing through the detector to ground, and for deriving a D.C. voltage from D.C. leakage current from the transformer to ground, and a circuit for applying the derived D.C. voltage to the control input of the shutdown control circuit, whereby the power supply may be shut down in the presence of leakage current in excess of the trigger voltage which is derived exclusively from D.C. current leakage from the transformer to ground.

Cette invention concerne un circuit de détection de défaut à la terre comprenant une source d'alimentation, un transformateur à enroulement primaire raccordé à la source d'alimentation et à enroulement secondaire haute tension, un circuit de mise hors tension à interrupteur commutable, un organe de commande couplé à l'interrupteur pour forcer son ouverture lorsque la tension de déclenchement appliquée à l'organe de commande est dépassée, le circuit de mise hors tension étant couplé à la source d'alimentation pour couper l'alimentation à l'ouverture de l'interrupteur, un circuit connecté à l'enroulement secondaire haute tension pour la détection des fuites à la terre à partir du transformateur et pour le court-circuitage de la composante alternative du courant de fuite traversant le détecteur en direction de la terre, un circuit de dérivation d'une tension en courant continu du courant continu de fuite à la terre du transformateur et un circuit servant à appliquer la tension en courant continu dérivée à l'organe de commande du circuit de mise hors tension pour effectuer la coupure du courant d'alimentation à la détection d'un courant de fuite dont la tension, dérivée exclusivement du courant continu de fuite à la terre à partir du transformateur, dépasse la tension de déclenchement.

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