Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1980-09-05
1982-07-27
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 85, 361 86, 364483, H02H 338, H02H 324
Patent
active
043420630
ABSTRACT:
The invention relates to a memory circuit in a relay protection device with a phase-locked loop, a monitoring circuit and an updating circuit. When a fault detector, a phase-change detector and/or an amplitude-change detector monitoring an a.c. network to which the protection device is connected supply an output signal indicative of a fault in the network, no updating of a storing member in the loop takes place.
REFERENCES:
patent: 3569785 (1971-03-01), Durbeck et al.
patent: 3723864 (1973-03-01), Ricard
ASEA Aktiebolag
Salce Patrick R.
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