Patent ID: 9588527
Date: 2017-03-07
CPC Classifications: G05F,H01F,H01H

Claim:
1. A method of operating an on-load tap changer connected on an upstream side by an input line with a control transformer and a downstream side to an output line, the tap changer comprising the steps of: providing a switching module having whereby in a first position the upstream switch of the first branch is closed and the downstream switch of the first branch is open while the upstream switch of the second branch is open and the downstream switch of the second branch is closed for current flow from the input line to the output line in a first direction through the sub-winding; in a second position the upstream switch of the first branch is open and the downstream switch of the first branch is closed while the upstream switch of the second branch is closed and the downstream switch of the second branch is open for current flow from the input line to the output line in a second direction opposite the first direction through the sub-winding; in a third position both switches of one of the load branches are closed and there is no current flow through the sub-winding; for setting an intermediate position,