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

Claim 8:
9. The method of claim 8 wherein, if it is determined that the first power-transmitting conductor is faulted to ground, the step of comparing the ratio against a threshold value further comprises:
calculating a fourth ratio formed by dividing the maximum rate of change of the filtered current signal of the return conductor assuming the negative current direction therethrough by the maximum rate of change of the filtered current signal of the second power-transmitting conductor assuming the negative current direction therethrough; and
checking whether the fourth ratio is less than or equal to a third one of the threshold values, and
if true then determining that the first power-transmitting conductor is the only faulted conductor which is faulted to ground, or
if false then determining that the first power-transmitting conductor and the return conductor are faulted to ground.