Patent ID: 9581649
Date: 2017-02-28
CPC Classifications: G01R,H02M

Claim:
1. A method of detecting faults in a load having a plurality of load phases, the method comprising: using at least one processor, determining phasor values representing voltages and currents associated with the individual load phases at least partially according to a plurality of sets of input values, the individual sets representing the voltages and currents associated with the individual load phases at a corresponding plurality of sample times; using the at least one processor, determining voltage and current sequence components at least partially according to the phasor values; using the at least one processor, determining at least one sequence impedance value by recursively solving a set of update equations at least partially according to the voltage and current sequence components; and using the at least one processor, selectively detecting at least one load fault condition at least partially according to the at least one sequence impedance value.