Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1987-11-12
1989-04-04
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With phase sequence network analyzer
361 79, 361 82, 361 84, H02H 3353
Patent
active
048191191
ABSTRACT:
A phase selector for identifying a faulted phase in a three-phase alternating current electrical current distribution system generates, for each of the three phases, an output signal which includes the phasor sum of a signal related to a fault component of current flowing in the phase, a signal related to a negative sequence component of current flowing in the phase and a signal related to a zero sequence component of current flowing in the phase. The phase selector also generates at least one restraint signal which includes the phasor sum of a signal related to a fault component of current flowing in one of the two other phases of the three phase power distribution system, a signal related to a fault component of current flowing in the other of the two other phases of the three phase electrical power distribution system and a signal related to the negative sequence component of current flowing in the phase. A net operate signal is generated when the magnitude of the operate signal exceeds the magnitude of the restraint signal.
REFERENCES:
patent: 4390835 (1983-01-01), Elkateb et al.
patent: 4398232 (1983-08-01), Elmore
patent: 4453191 (1984-06-01), Wilkinson
patent: 4686601 (1987-08-01), Alexander et al.
Deboer Todd E.
General Electric Company
Murray William H.
Polincinski Henry J.
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