Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Patent
1995-06-29
1997-04-08
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
323263, G05F 1147
Patent
active
056191219
ABSTRACT:
A tap changer including a tap positionable to vary the winding ratio of the transformer in response to changes in an electric load on the transformer is disclosed herein. The transformer includes an electric drive which is electrically powered to selectively position the tap to effect incremental changes of the winding ratio. The transformer includes a monitoring system which monitors the load voltage of the transformer with at least one potential transformer which produces signals which are converted to digital data values stored in a circular data buffer. Each time control signals are applied to the electric drive and a subsequent tap change indication is detected, the first and last data values in the circular buffer are compared, and when the difference between the values exceeds a predetermine limit, the system updates a tap position value which represents the position of the tap.
REFERENCES:
patent: 3622867 (1971-11-01), Topper et al.
patent: 4419619 (1983-12-01), Jindrick et al.
patent: 5119012 (1992-06-01), Okamura
patent: 5408171 (1995-04-01), Eitzmann et al.
patent: 5545974 (1996-08-01), Trainor et al.
Berhane Adolf
Boles, Esq. Donald M.
Siemens Energy & Automation Inc.
Wong Peter S.
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