Operating a static transfer switch to eliminate transformer inrush current in the presence of residual flux

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United States of America Patent

PATENT NO 9520874
APP PUB NO 20140132080A1
SERIAL NO

14056258

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Abstract

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A method is provided for operating a static transfer switch to eliminate transformer inrush current in the presence of residual flux. The method includes: detecting an interrupt of electric power at an output terminal of the static transfer switch; controlling amplitude of voltage at the output terminal using phase fired control of one or more silicon controlled rectifiers interposed between a voltage source and the output terminal, where the amplitude of voltage is set at a value less than a peak value of the sinusoidal waveform; and increasing the amplitude of voltage at the output terminal incrementally until the amplitude reaches a peak value.

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Patent Owner(s)

  • LIEBERT CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bush, Terry D Westerville, US 23 193
Miller, James M Fredericktown, US 173 3336

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