Tap changer for stepped transformer with oil exhaust

摘要

The lap changer has a load change-over switch in an oil tank. A tap selector is under the tank and is driven together with the change-over switch. The drive has a coupled indicator drive for selector positions. The reduction drive is fitted at the tank bottom and coupled to the indicator disc by an insulating shaft, near the tank inner wall. The insulating shaft (14) is tubular, opening into a central bore (21) of a coupled drive gear (10) and into a bottom (2) bearing journal (12) with oil parts (13). The bearing journal (15) of the indictor disc (16), coupled to the tube, is hollow and tightly fitting into a lid (5) flange bore with an external tube connecting union (17).