Patent ID: 11971440
Assignee: UNIVERSITY OF MANITOBA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 11:
12. The method of claim 11 wherein, if it is determined that the second power-transmitting conductor is faulted to ground, the step of comparing the ratio against a threshold value further comprises:
calculating a fifth ratio formed by dividing the maximum rate of change of the filtered current signal of the first power-transmitting conductor assuming the positive current direction therethrough by the maximum rate of change of the filtered current signal of the return conductor assuming the positive current direction therethrough; and
checking whether the fifth ratio is greater than or equal to an inverse of the third threshold value, and
if true then determining that the second power-transmitting conductor is the only faulted conductor which is faulted to ground, or
if false then determining that the second power-transmitting conductor and the return conductor are faulted to ground.