Patent ID: 8624565
Filing Date: 2014-01-07
Classification: H01F,H01H

Abstract:
1. A tap changer with semiconductor switching elements for uninterrupted switching over between fixed tap changer contacts electrically connected with winding taps of a tapped transformer, wherein the fixed tap changer contacts are arranged along a track, wherein a contact carriage is movable along the track, wherein arranged on the contact carriage are electrically conductive and mutually insulated contact bridges and, in turn electrically insulated relative thereto, two further, electrically interconnected contact bridges, by which contact bridges selectably in static operation one of the fixed tap changer contacts is directly connectable with a load shunt and during the changeover a respective one of the fixed tap changer contacts is temporarily connectable with an input of one of the semiconductor switches and in addition the output of the respective semiconductor switch is connectable with the load shunt, and wherein the load shunt comprises fixed, divided shunt contact members of such a kind that the semiconductor switching elements in static operation are electrically separated from the load shunt and thus from the transformer winding.