Series voltage regulator having: - an input connection which is connected to a supply line, wherein the supply line can be connected to an input voltage (U L), - an output connection which is configured to provide a regulated output voltage (U R), - a voltage source, - a transformer for generating an additional voltage (U RB) and for coupling the additional voltage (U RB) into the input voltage, and - a tap changer, wherein the transformer has an input winding and an output winding, wherein the output winding is arranged in the supply line, wherein a connection of the output winding of the transformer is connected to the input connection of the series voltage regulator and the other connection of the output winding is connected to the output connection of the series voltage regulator, wherein the input winding of the transformer has a plurality of taps which are connected to output connections of the tap changer, wherein the voltage source is formed by the input winding of the transformer, which is configured to interact with the tap changer in order to generate the additional voltage (U RB), wherein an input connection of the tap changer is connected to a reference potential, wherein a connection of the input winding of the transformer is connected to the reference potential via the tap changer and the other connection of the input winding is connected to the output connection of the series voltage regulator, or wherein a connection of the input winding of the transformer is connected to the reference potential via the tap changer and the other connection of the input winding is connected to the input connection of the series voltage regulator, characterized in that the positions of the taps are distributed in a non-linear manner over the number of turns of the input winding of the transformer in such a manner that a change in the selection of a tap enables a linear change in the additional voltage (U RB). - an input connection which is connected to a supply line, wherein the supply line can be connected to an input voltage (U L), - an output connection which is configured to provide a regulated output voltage (U R), - a voltage source, - a transformer for generating an additional voltage (U RB) and for coupling the additional voltage (U RB) into the input voltage, and - a tap changer, wherein the transformer has an input winding and an output winding, wherein the output winding is arranged in the supply line, wherein a connection of the output winding of the transformer is connected to the input connection of the series voltage regulator and the other connection of the output winding is connected to the output connection of the series voltage regulator, wherein the input winding of the transformer has a plurality of taps which are connected to output connections of the tap changer, wherein the voltage source is formed by the input winding of the transformer, which is configured to interact with the tap changer in order to generate the additional voltage (U RB), wherein an input connection of the tap changer is connected to a reference potential, wherein a connection of the input winding of the transformer is connected to the reference potential via the tap changer and the other connection of the input winding is connected to the output connection of the series voltage regulator, or wherein a connection of the input winding of the transformer is connected to the reference potential via the tap changer and the other connection of the input winding is connected to the input connection of the series voltage regulator, characterized in that the positions of the taps are distributed in a non-linear manner over the number of turns of the input winding of the transformer in such a manner that a change in the selection of a tap enables a linear change in the additional voltage (U RB). wherein the transformer has an input winding and an output winding, wherein the output winding is arranged in the supply line, wherein a connection of the output winding of the transformer is connected to the input connection of the series voltage regulator and the other connection of the output winding is connected to the output connection of the series voltage regulator, wherein the input winding of the transformer has a plurality of taps which are connected to output connections of the tap changer, wherein the voltage source is formed by the input winding of the transformer, which is configured to interact with the tap changer in order to generate the additional voltage (U RB), wherein an input connection of the tap changer is connected to a reference potential, wherein a connection of the input winding of the transformer is connected to the reference potential via the tap changer and the other connection of the input winding is connected to the output connection of the series voltage regulator, or wherein a connection of the input winding of the transformer is connected to the reference potential via the tap changer and the other connection of the input winding is connected to the input connection of the series voltage regulator, characterized in that the positions of the taps are distributed in a non-linear manner over the number of turns of the input winding of the transformer in such a manner that a change in the selection of a tap enables a linear change in the additional voltage (U RB).