Ground monitoring system

Details Ground monitoring system Ground monitoring system

1978-08-28

1980-10-14

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324 51, H02H 316

Patent

active

042284759

ABSTRACT:
A ground monitoring circuit for detecting the existence and proper connection of the ground wires in an electrical power cable of a type commonly used at a surface mining site. A complete conductive loop is established between the ground conductor, or conductors, and the ground check, or pilot, wire of the cable. A sensing signal at a frequency higher than the power frequency is coupled onto the ground monitoring loop. The voltage and current in the loop are separately sampled. Various comparisons of the voltage and current samples are made to detect any deviation in the resistance and/or reactance characteristics of the loop. Any deviation from desired conditions in the loop produce one or more output signals that change the condition of a trip relay. The trip relay initiates action that ultimately opens circuit breakers to remove power from the cable.

REFERENCES:
patent: 3676739 (1972-07-01), Neuhouser
patent: 3728582 (1973-04-01), Agnew
patent: 3783340 (1974-01-01), Becker
patent: 3886409 (1975-05-01), Scarpino
patent: 4075675 (1978-02-01), Buckett et al.

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