Direct transfer-trip relaying system

Details Direct transfer-trip relaying system Direct transfer-trip relaying system

1975-01-15

1976-09-28

Miller, J. D.

317 28R, 317 29A, H02H 726

Patent

active

039834557

ABSTRACT:
This disclosure relates to a segregated phase comparison relaying system which is of the type wherein the current at each end of each of the conductors of a protected section of a three-phase transmission network is phase compared over a communication network for determining whether the fault of the faulted conductor is located within or external to the protected section of the transmission network. Under certain conditions it is desirable to transmit a breaker opening signal from one end (transmitting end) of the protected section to the other end (receiving end) thereof to provide a direct transfer-trip at the receiving end in response to the detection at the transmitting end of a fault which might not cause the breaker at the receiving end to open when using the segregated phase comparing system. Such direct transfer-trip resulting faults may be caused by numerous fault conditions such as, for example, the partial faulting of a voltage changing power transformer located within the protected network section, or the failure of a breaker other than the breaker at the receiving end to open and interrupt the fault current. As disclosed herein the direct transfer-trip signal is transmitted from the transmitting end to the receiving end by altering the normal phase comparing transmission into a peculiar predetermined pattern.

REFERENCES:
patent: 3414772 (1968-12-01), Sonnemann
patent: 3423634 (1969-01-01), Wagner
patent: 3832601 (1974-08-01), Hinman, Jr. et al.
patent: 3882361 (1975-05-01), Hinman, Jr.

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