04075675 is referenced by 37 patents and cites 8 patents.

A system and method for monitoring the continuity of a ground conductor in a power transmission system. A plurality of power transmission cables extend between a power source and a load and include a ground conductor extending between the source and the load. The monitoring system includes a transmitter for transmitting a signal within the audio range over the ground conductor. A receiver receives the signal from the transmitter over the ground conductor. The receiver has associated therewith an alarm device and/or a circuit breaker. In response to the absence of the signal at the receiver which would correspond to an interruption in the ground conductor, the circuit breaker is opened to disconnect the power source from the load. Both the receiver and transmitter are coupled to the ground conductor through closed inductive systems comprising toroids.

Title
Ground conductor monitoring system and method
Application Number
431325
Publication Number
4075675
Application Date
May 21, 1976
Publication Date
February 21, 1978
Inventor
Harry L Harshbarger
Bluefield
WV, US
Joseph C Burkett
Bramwell
WV, US
Agent
Cushman Darby & Cushman
Assignee
Genoa Coal Company
WV, US
IPC
H02H 1/02
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