Patent ID: 8648587

Claim:
A combination of a tap changer at a regulating transformer, wherein the tap changer comprises a mechanical contact system for selection of a tap of a regulating winding of the regulating transformer as well as a load changeover switch for actual on-load switching, the regulating transformer comprises an oil-filled vessel in which at least one yoke and windings of the regulating transformer are disposed, the vessel is closed at the top by a transformer cover, the mechanical contact system of the tap changer is in the vessel below the transformer cover and above the yoke, the load changeover switch is outside the vessel above the transformer cover, the load changeover switch and mechanical contact system of the tap changer are separated from one another by a horizontal insulating lead-through plate, the load changeover switch comprises thyristors or IGBTs for uninterrupted on-load switching over, and the regulating transformer is a local mains transformer or a consumer-proximal distributing transformer.