Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1985-03-06
1989-06-20
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
364483, H02H 334
Patent
active
048414050
ABSTRACT:
Protective relay apparatus for providing a compensated fault impedance measurement for the determination of a better estimate of fault location along a transmission line is disclosed. In a power system network including local and remote generating sources disposed at respective ends of a transmission line segment of the transmission line, the protective relay apparatus is disposed at the local end of the line segment to measure the fault impedance for use in determining fault location. However, load flow conditions rendered by the generating sources interact with a fault which contributes resistance substantially to the fault impedance of the transmission line to cause an erroneous component in the fault impedance measurement rendering the determination of an erroneous fault location. The protective apparatus disclosed generates a signal as a measure of this erroneous component and compensates the fault impedance measurement as a function of the erroneous component signal, a predetermined impedance characteristic of the transmission line segment, and the fault impedance measurement to provide the compensated fault impedance measurement.
REFERENCES:
patent: 4107778 (1978-08-01), Nii et al.
patent: 4313169 (1982-01-01), Takagi et al.
patent: 4371907 (1983-02-01), Bignell
patent: 4450497 (1984-05-01), Bignell
patent: 4455612 (1984-06-01), Girgis et al.
patent: 4570231 (1986-02-01), Bunch
"New Distance Protective Relay with Improved Coverage for High Resistance Earth Faults", by A. T. Johns et al., IEE Proceedings, vol. 124, No. 4, 4-1977.
Jennings Derek S.
Pellinen A. D.
Studebaker B. R.
Westinghouse Electric Corp.
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