Protective relay system

Details Protective relay system Protective relay system

1982-07-13

1984-08-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 66, 361 68, 361 69, H02H 330

Patent

active

044646976

ABSTRACT:
Protective relaying apparatus of the pilot type, incorporating a direct transfer trip function (DTT) which reliably and securely utilizes the same communication channel utilized by the pilot relaying function. The DTT function operates within the constraints of a PPM modem, utilizing a signal extracted from the carrier signal, to provide a perfectly synchronized tone for the DTT signal.

REFERENCES:
patent: 2144493 (1939-01-01), Harder et al.
patent: 2376752 (1945-05-01), Bostwick
patent: 3983455 (1976-09-01), Hinman, Jr.
patent: 4056838 (1977-11-01), Leib

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