Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1977-04-20
1979-04-03
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
324 52, 361 81, H02H 326
Patent
active
041480872
ABSTRACT:
A distance relay system for a three-phase electric power transmission line comprises means for producing positive, negative and zero sequence symmetrical component voltages from the phase voltages of the line, and means for producing positive, negative and zero sequence voltage drops from the corresponding sequence currents and impedances of the line. Zero sequence current in a parallel line and the mutual impedance between the lines may be taken into account. Predetermined ratios of the sequence voltages and changes in the voltage drops are used to produce a distance factor K corresponding to the ratio of the distance to a fault on the line and the length of the line. The single equation for K applies to all ten fault conditions that can occur on the line. A fault signal is produced when K lies between predetermined fault values. The faulted phase of single phase to ground faults may be identified. Particular expressions for K are given.
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"Fundamentals Basis for Distance Relaying on 3-Phase Systems", Lewis et al., AIEE Transactions, vol. 66, 1947.
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