Method and apparatus using VAR measurements to control power input to a three-phase induction motor circuit
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United States of America Patent
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May 27, 2008
Grant Date -
Feb 1, 2007
app pub date -
Aug 1, 2005
filing date -
Aug 1, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are described for controlling the flow of power in each input line to a three phase AC inductive load in order to reduce the amount of VAR in the system, and thus increase the operational efficiency of the inductive load. Solid state relays are positioned in series in each of the three inductive load line inputs, and current allowed to flow to the inductive load only during the time during which the SSRs are in a conducting state. The calculation of VAR is achieved by processing data from each of the input lines using a separate controller boards each dedicated to each of the lines. The controller in turn, based on the calculated VAR, increments the time, either increasing or decreasing it from a predetermined value, during which the SSRs in that line remains in the non-conducting state.
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