Time division multiplex system for a segregated phase comparison

Details Time division multiplex system for a segregated phase comparison Time division multiplex system for a segregated phase comparison

1976-03-10

1977-04-26

Moose, Harry

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 45, H02H 726

Patent

active

040203964

ABSTRACT:
This disclosure relates to a protective relaying system for a polyphase power transmission line in which at least two separate line operating conditions at a remote end of a protected line section are transmitted to a local end of the line section over a single communication channel. In the preferred illustrated embodiment, the operating conditions of three-line conductors are sequentially transmitted whenever a fault condition is sensed on any one or more of the three-line conductors. During the normal, non-faulted operation, a coded signal is continually transmitted to maintain the time derived signals at the receiver in substantial synchronism with the time derived signals of the transmitter. The coded signal also establishes a trip inhibiting or guard signal at the receiver.

REFERENCES:
patent: 2677014 (1954-04-01), Moynihan
patent: 3882361 (1975-05-01), Hinman, Jr.
patent: 3893008 (1975-07-01), Strickland et al.

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