Method and apparatus for detecting direct currents in a transmis

Details Method and apparatus for detecting direct currents in a transmis Method and apparatus for detecting direct currents in a transmis

1975-06-23

1978-10-03

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324117R, 361 45, 179 1MN, H04M 322, H02H 102

Patent

active

041185978

ABSTRACT:
An electromagnetic sensing apparatus includes one or more magnetic cores coupled by windings to a pair of transmission line conductors for sensing the presence, and in some cases the magnitude and direction of loop currents flowing in the transmission line, without interfering with the transmission of signal information therealong. In one embodiment, the direction of loop current flow in the transmission line conductors is detected by applying a steady-state electromagnetic bias to the magnetic core to cause a polarity or direction determining asymmetrical response in a sense circuit that is electromagnetically coupled to the core by a sense winding. In another embodiment, a pair of separate magnetic cores are used, each having associated drive windings connected in series with the transmission line conductors, and associated sense windings. The various drive and sense windings are wound on the magnetic cores so as to cause detection of the direct loop current flowing in the transmission line conductors, and at the same time to cause self-cancellation of any electromagnetic coupled of the sensing signal to the drive windings which would otherwise appear as interference or noise on the transmission line.

REFERENCES:
patent: 2153378 (1939-04-01), Kramer
patent: 3139488 (1964-06-01), Wirth, Jr.
patent: 3175042 (1965-03-01), Baldwin, Jr. et al.
patent: 3461247 (1969-08-01), VAN Bosse
patent: 3473091 (1969-10-01), Morris et al.

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