Mathematical model of carbon brush used at transformers with continuously adjustable voltage

In the carbon brush which is used at the transformers with continuously adjustable voltage under load occurs an irregular distribution of current and therefore the ohmic resistance of conductor route through the sliding contact cannot be calculated with the classical formula, and in this case, in the closed loop consisting of the turn which is shorted by carbon brush it is produced an short-circuit current, the determining factor for the production of a considerable local.