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