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US 8,576,038 B2Granted
Tap changer with a polarity switch for a variable transformer
AssigneeMaschinenfabrik Reinhausen GmbH
InventorsAxel Kraemer, Dazhong Shen
Life of this patent
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Abstract
The invention relates to a step switch provided with a preselector and a polarity circuit, a separate polarization resistance being respectively provided at the beginning and the end of the stepped winding. Optionally, the two polarization resistances can be connected continuously or via separate polarity switches.
Claims4
In combination:
- a regulating transformer having a main winding having an end and a tap winding having a start, an end, and a plurality of taps;
- a tap changer connected to a load shunt and selectably connectable to the taps;
- a preselector connected to the start and end of the tap winding and to the end of the main winding;
- a first polarity resistor connected between the start of the tap winding and the load shunt;
- and
- a second polarity resistor connected between the end of the tap winding and the load shunt.
3 more elements
Dependencies are inferred from the claim text.