Apparatus for regulating an electric voltage in at least one of electric
supply networks and consumer units. The apparatus includes a regulating transformer
arranged between a network node and at least one end consumer. The regulating transformer
utilizes a primary winding and a regulating winding which includes switchable partial
windings and a high leakage impedance. The transformer conducts a nominal current.
A transfer switch switches the partial windings of the regulating transformer.
Adjacent tappings of the partial windings are adapted to short circuit such that,
in an event of the short circuit, the high leakage impedance limits a ring current
which results from the short circuit to an order of magnitude of the nominal current.
The regulating transformer produces both an increase in voltage and a decrease
in voltage at the end consumer. This abstract is not intended to define the invention
disclosed in the specification, nor intended to limit the scope of the invention
in any way.
