Line isolation monitor

Details Line isolation monitor Line isolation monitor

1975-03-27

1976-07-20

Trafton, David L.

Communications: electrical

Systems

Call station

317 18C, 324 51, G08B 2100

Patent

active

039710076

ABSTRACT:
A line isolation monitor for detecting faults of lines isolated from ground in which a constant current generator generates an electrical signal having one or more frequencies near the power line frequency and applies the electrical signal to the power lines. A signal sensor detects the generated electrical signal on the power line and a discriminator determines the effect of the phase angle of the impedance from each of the power lines conductors to ground and the effect of the relative magnitudes of each of the conductors impedance to ground to detect a fault. A threshold circuit generates an alarm signal if the current flow is above a predetermined level, to energize audible and visible alarms.

REFERENCES:
patent: 3626281 (1971-12-01), Souillard
patent: 3710238 (1973-01-01), Peterson
patent: 3728582 (1973-04-01), Agnew
patent: 3774106 (1973-11-01), MacPhee

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