Elimination of potential transformer in ANSI Type A voltage regulator
AssigneeSiemens Power Transmission & Distribution, Inc.
InventorsRobert Champion, Muhammad Sohail
Life of this patent
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Abstract
An ANSI Type A voltage regulator that eliminates the need for a potential transformer is disclosed. A control unit finds an output voltage by constantly monitoring the input voltage across the utility windings and the stored tap position. The value of the output voltage is further fine tuned by taking into account the effect of the impedance of the voltage regulator itself on the output voltage. The impedance is calculated using the instantaneous current through the regulator, the maximum rated current of the voltage regulator, the instantaneous voltage through the voltage regulator, the instantaneous Power Factor, and the tap position of the voltage regulator.
Claims27
A voltage regulator for regulating an output voltage in response to an input voltage and a calculated output voltage, the voltage regulator comprising:
- at least three external bushings for accessing electrical signals and for reading the values of said input and output voltages of said voltage regulator;
- a control unit for constant monitoring of input voltage, tap position and output voltage, for continuously storing said tap position electronically, and for calculating an output voltage, and fine tuning said calculated output voltage;
- internal utility windings for providing said input voltage and to power said control unit;
- and
- a tap changing mechanism for manipulating said tap position in response to commands received from said control unit.
A method of calculating an output voltage in a voltage regulator, the method comprising:
- determining the input voltage across internal utility windings of said voltage regulator;
- monitoring constantly said input voltage, tap position and output voltage by a control unit;
- storing continuously said tap position electronically by said control unit;
- calculating an output voltage using said tap position and said input voltage by said control unit;
- refining said calculated output voltage by said control unit by factoring in the effects of the impedance inherent to said voltage regulator;
- and
- changing position of said tap in response to said refine calculated output voltage determined by said control unit.
A computer-readable medium having stored thereon computer-executable instructions for calculating an output voltage in a voltage regulator, the computer-executable instructions when executed by a processor, cause the processor to perform a method comprising the steps of:
- determining the input voltage across internal utility windings of said voltage regulator;
- monitoring constantly said input voltage, tap position and output voltage by a control unit;
- storing continuously said tap position electronically by said control unit;
- calculating an output voltage using said tap position and said input voltage by said control unit;
- refining said calculated output voltage by said control unit by factoring in the effects of the impedance inherent to said voltage regulator;
- and
- changing position of said tap in response to said refine calculated output voltage determined by said control unit.
Dependencies are inferred from the claim text.