Three terminal current differential protective relay

Details Three terminal current differential protective relay Three terminal current differential protective relay

1984-02-22

1985-08-27

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 87, H02H 726

Patent

active

045381950

ABSTRACT:
A current differential pilot protective relay apparatus for multi-terminal high-voltage, three-phase alternating current transmission lines. The pilot protective relay system provides comparison, at each terminal of the transmission line, of the currents flowing on each phase of the three-phase transmission line at each terminal thereof. A novel scheme of summing the current-derived signals at one terminal reduces the number of receivers and transmitters necessary to send the local signal from each terminal to all of the other terminals. Instead, the current-derived signals are summed at one of the terminals and the sum signal is then transmitted to each of the other terminals.

REFERENCES:
patent: 2536809 (1951-01-01), Hodgkiss
patent: 3148309 (1964-09-01), Neher
patent: 4275429 (1981-06-01), Church et al.
patent: 4408246 (1983-10-01), Ray
patent: 4464697 (1984-08-01), Sun

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