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Techniques for improving operation of static transfer switches during voltage disturbances

  • US 9,876,390 B2
  • Filed: 10/16/2013
  • Issued: 01/23/2018
  • Est. Priority Date: 11/13/2012
  • Status: Active Grant
First Claim
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1. A static transfer switch, comprising:

  • a preferred input terminal configured to receive an AC voltage signal from a preferred voltage source;

    a data port configured to receive a message via a data link from a device associated with the preferred voltage source, where the message is indicative of a voltage disturbance in the voltage signal;

    a load terminal;

    a first switch arrangement electrically connected between the preferred input terminal and the load terminal and operates to selectively output the voltage signal to the load terminal, wherein the first switch arrangement includes one or more semiconductor switches; and

    a controller configured to receive the message from the data port and operable, in response to receiving the message, to initiate a timer and compare duration of the timer to a threshold,wherein the controller, in response to the duration being less than the threshold, to controls conductive state of the semiconductor switches to change waveform of the voltage signal output by the first switch arrangement to the load terminal, thereby avoiding magnetic flux saturation in a downstream transformer; and

    wherein the controller, in response to the duration being greater than the threshold, couple an alternate input terminal to the load terminal, where the alternate input terminal is configured to receive an AC voltage signal from an alternate voltage source.

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