Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1981-08-11
1983-02-01
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 79, 361 84, H02H 340
Patent
active
043719074
ABSTRACT:
Protective relay apparatus and methods for detecting direction to a fault from a measuring point on an A.C. electrical power transmission line using current and voltage deviation signals which may include traveling wave transients, and for providing both directional and distance information from the same signals after traveling wave transients have been removed. Fault generated current and voltage deviations from the steady-state, prefault magnitudes are used to generate trajectories in one embodiment by differentiating the current deviation and using it as one coordinate, and by using the voltage deviation as the other coordinate. A forward fault produces a straight line trajectory which crosses the origin between the second and fourth quadrants, and the reverse direction fault produces a straight line trajectory which crosses the origin between the first and third quadrants. Providing threshold boundaries in the quadrants and detecting a crossing thereof provides fault direction according to the quadrant in which the crossing occurred.
REFERENCES:
patent: 3474333 (1969-10-01), Hoel
patent: 3700919 (1972-10-01), Stich
patent: 4287547 (1981-09-01), Vitins
patent: 4297740 (1981-10-01), Hagberg
patent: 4351011 (1982-09-01), Liberman
Lackey D. R.
Moose Jr. Harry E.
Westinghouse Canada Inc.
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