Patent ID: 9383413
Filing Date: 2016-07-05
CPC Classification: G01R

Claim Text:
1. A method for locating a fault in a rotor winding of an electrical generator, said method comprising: performing a Recurrent Surge Oscillograph (RSO) test, where the RSO test inputs a transmitted signal sequentially into each terminal of a winding conductor and measures output at each terminal; analyzing output data from the RSO test; identifying an anomaly in a reflected RSO signal; determining an elapsed time between the transmitted signal and the anomaly in the reflected RSO signal for a first terminal; calculating, using a microprocessor, a distance from the first terminal along the winding conductor to the fault based on the elapsed time, where calculating the distance includes multiplying one-half of the elapsed time by a rate of travel of the transmitted signal in the winding conductor; and using a mathematical model of the winding conductor to identify a location of the fault based on the distance from the first terminal.