Patents by Inventor David T. Stone

David T. Stone has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Current transformer saturation correction using artificial neural networks
    Patent number: 6247003
    Abstract: A method and apparatus of correcting for saturation in a current transformer, which outputs a current measurement, is provided. A switching algorithm receives a value of the current measurement from the current transformer and determines within which of three ranges the value falls. If the value falls in a first range, the current measurement is provided to a protective device such as a relay. If the value falls in a second range, the current measurement is provided to an artificial neural network that produces an output that accounts for saturation of the current transformer. If the value falls in a third range, the current measurement is provided to another artificial neural network that produces an output that accounts for saturation of the current transformer.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: June 12, 2001
    Assignee: McGraw-Edison Company
    Inventors: James C. Cummins, David C. Yu, David T. Stone, Ljubomir A. Kojovic