Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1982-07-29
1984-02-21
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 81, 361 67, H02H 326, H02H 726
Patent
active
044333536
ABSTRACT:
Disclosed is a positive sequence undervoltage distance relay that forms a part of a relay system that provides protection for a high voltage three phase transmission line. The undervoltage distance relay provides a high speed blocking function for use with the high speed tripping functions in the protective relay system. In one embodiment the undervoltage distance relay utilizes the positive sequence components of the three phase transmission line. In another embodiment the undervoltage distance relay utilizes the line to ground (or line to line) voltages and currents of the three phase transmission line.
REFERENCES:
patent: 4034269 (1977-07-01), Wilkinson
patent: 4148087 (1979-04-01), Phadke
patent: 4161011 (1979-07-01), Wilkinson
patent: 4342064 (1982-07-01), Wilkinson
Freedman William
General Electric Company
McMahon John P.
Salce Patrick R.
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