Audio frequency interface for differential relays

Details Audio frequency interface for differential relays Audio frequency interface for differential relays

1988-10-03

1989-10-31

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Remote indication over telephone line

379102, 379 97, 340658, 324 83A, 324 86, 324107, H04M 1100

Patent

active

048782416

ABSTRACT:
The invention interfaces a two-wire 60 Hz circuit to two circuits, each unidirectional, sending and receiving, and carrying frequency modulated audio tones containing the amplitude and phase of the 60 Hz voltage impressed on the 60 Hz circuit. The invention is used to interface differential relays used by electric utilities to detect power transmission line faults to a four-wire voice band communication line.

REFERENCES:
patent: 4626622 (1986-12-01), Bouvrette
patent: 4718079 (1988-01-01), Rubito
patent: 4724435 (1988-02-01), Moses et al.

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