Line isolation monitor

Details Line isolation monitor Line isolation monitor

1974-10-25

1976-08-31

Caldwell, John W.

Communications: electrical

Systems

Call station

317 18R, 324 51, G08B 2100

Patent

active

039784657

ABSTRACT:
A line isolation monitor which monitors ground faults on a normally ungrounded AC power line. The monitor uses a low voltage sensing current having a frequency greater than the frequency of the power line. The monitor tests each side of the power line independently. Provision can be made to indicate a double fault to ground. Further refinements include a means to monitor the connection between the monitor device and ground as well as a means for confirming continuity of annunciator lines associated with the line isolation monitor.

REFERENCES:
patent: 3066284 (1962-11-01), McKinley et al.
patent: 3710238 (1973-01-01), Peterson
patent: 3737765 (1973-06-01), Lee et al.
patent: 3754221 (1973-08-01), Stelter
patent: 3757169 (1973-09-01), Beresnikow
patent: 3868665 (1975-02-01), Treglown

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