Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1982-01-28
1983-09-06
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 82, H02H 300
Patent
active
044032684
ABSTRACT:
A protective relay having means for adjusting a plurality of characteristic angles is disclosed. A characteristic angle is preselected to correspond to a desired reach representative of one or more zones of an A.C. high voltage transmission line desired to be protected. The adjustable characteristic angle means is interconnected to each of the one or more phases of the A.C. transmission line by a cascaded arrangement of one or more transactors and clamping means. The adjustable characteristic angle means comprises an operational amplifier, a plurality of resistors, a capacitor and selectable means for interconnecting each of the plurality of resistors one at a time to the operational amplifier. The plurality of resistors have values to correspond to the desired characteristic angles of the protective relay. The operational amplifier in combination with the plurality of resistors and the capacitor develop an output signal having a substantially constant magnitude as the characteristic angle is varied.
REFERENCES:
patent: 4161011 (1979-07-01), Wilkinson
Freedman William
General Electric Company
McMahon John P.
Moose Jr. Harry E.
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