Dual channel dynamic line isolation monitor

Details Dual channel dynamic line isolation monitor Dual channel dynamic line isolation monitor

1975-08-29

1976-08-24

Caldwell, John W.

Communications: electrical

Systems

Call station

317 18R, 324 51, G08B 2100

Patent

active

039769879

ABSTRACT:
A line isolation monitor for indicating the maximum hazard current in an ungrounded power distribution system with conductor lines having leakage impedances. A signal proportional to the maximum voltage to ground of any of the conductor lines in the system is determined and used as a reference voltage for the monitor. Separate circuits each responsive to the reference voltage generate respectively a capacitive component signal and a resistive component signal which are combined and applied as a measurement signal across the system leakage impedances in parallel. The impedance voltage response to the measurement current is separated from the line voltage signal, phase shifted and compared to the reference voltage signal to produce a difference signal which is used to control the magnitude of both the capacitive component signal and the resistive component signal. The magnitude of the combined capacitive component signal and the resistive component signal represents the maximum hazard current.

REFERENCES:
patent: 3579219 (1971-05-01), Wolfframm
patent: 3666993 (1972-05-01), Legatti
patent: 3668472 (1972-06-01), Shields
patent: 3696366 (1972-10-01), Parsons
patent: 3699392 (1972-10-01), Lee et al.
patent: 3700966 (1972-10-01), Morrow
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

Affiliated with

Also associated with

Rating

Dual channel dynamic line isolation monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual channel dynamic line isolation monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual channel dynamic line isolation monitor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-781850