Tap-changer switching system and method of operating same

Abstract

The invention relates to a switching system for a tapped transformer with on-load tap changer wherein the tapped transformer comprises a main winding with a first main terminal; a coarse winding with a first coarse terminal and with a second coarse terminal; a control winding with a first control terminal; and an on-load tap changer that has a switch terminal and that interacts with the control winding; the switching system comprising a lead; a first switch subassembly comprising a first main fixed contact that can be connected to the first main terminal; a first coarse fixed contact that can be connected to the first coarse terminal; a first control fixed contact that can be connected to the first control terminal; a first switch fixed contact that can be connected to the first switch terminal; and a first movable bridge contact that is formed such that it electrically bridges or connects at least two fixed contacts of its switch subassembly in each stationary operating position of the switching system and/or during each switch over process of the switching system; a second switch subassembly comprising a second coarse fixed contact that can be connected to the second coarse terminal; a second control fixed contact that can be connected to the first control terminal and/or that is connected to the first control fixed contact; a second switch fixed contact that can be connected to the switch terminal and/or that is connected to the first switch fixed contact; and a second movable bridge contact that is formed such that it electrically bridges at least two fixed contacts of its switch subassembly in each stationary operating position of the switching system and/or during each switch-over process of the switching system; and a third switch subassembly comprising a first lead fixed contact that is connected to the lead; a third coarse fixed contact that can be connected to the first coarse terminal and/or that is connected to the first coarse fixed contact; a third control fixed contact that can be connected to the first control terminal and/or that is connected to the first control fixed contact; a third switch fixed contact that can be connected to the switch terminal and/or that is connected to the first switch fixed contact; and a third movable bridge contact that is formed such that it electrically bridges at least two fixed contacts of its switch subassembly in each stationary operating position of the switching system and/or during each switch over process of the switching system.

Dependencies are inferred from the claim text.