Ground wire monitoring system

Details Ground wire monitoring system Ground wire monitoring system

1974-11-07

1977-03-08

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324 51, 340256, 361107, H02H 316, H02H 102

Patent

active

040114830

ABSTRACT:
A ground wire monitoring circuit particularly adapted for use in connection with mining machinery that is supplied with alternating current through a flexible cable from a power source remote from the machine. The cable contains phase conductors, a ground wire and a pilot wire. The ground wire is energized through the pilot wire from a voltage derived from the alternating current power supply at the remote source. Any failure of the pilot wire or ground wire is detected by circuit means adjacent the remote power source and in the event of such failure the power circuit leading to the machine is immediately opened. The power circuit is opened in the event of failure of the ground wire even though there may be low resistance parallel ground paths between the machine frame and the remote power source.

REFERENCES:
patent: 2999189 (1961-09-01), Gerrard
patent: 3196316 (1965-07-01), Crom
patent: 3335324 (1967-08-01), Buckeridge
patent: 3729653 (1973-04-01), Mankoff et al.
patent: 3746929 (1973-07-01), Kotheimer
patent: 3852641 (1974-12-01), Titus
patent: 3855501 (1974-12-01), Agnew
patent: 3886409 (1975-05-01), Scarpino
patent: 3891894 (1975-06-01), Scarpino

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