Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1987-11-12
1989-04-11
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 76, 361 82, H02H 326
Patent
active
048211370
ABSTRACT:
A protective relay for detecting faults within a predetermined protected zone of a three phase alternating current electrical power distribution system generates a polarizing signal V.sub.POL which includes a signal V.sub.1 related to a positive sequence component of a phase voltage of the three phase power distribution system. A signal I.sub.1 Z.sub.R, which is a signal related to a positive sequence component of a phase current of the three phase power distribution system multiplied by a replica impedance of the protected zone of the three phase power distribution system, is also generated. The coincidence of the V.sub.POL and I.sub.1 Z.sub.R signals are compared and an operate signal is generated as a result of positive coincidence. A first restraint signal is generated as a result of negative coincidence. A second restraint signal related to V.sub.1 is also generated. A net operating signal is generated when the magnitude of the operate signal exceeds the sum of the magnitude of the first restraint signal and the second restraint signal.
REFERENCES:
patent: 4329727 (1982-05-01), Premerlani
patent: 4420788 (1983-12-01), Wilkinson et al.
patent: 4453191 (1984-06-01), Wilkinson
patent: 4686601 (1987-08-01), Alexander et al.
Deboer Todd E.
General Electric Company
Murray William H.
Policinski Henry J.
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