Dual channel dynamic line isolation monitor

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

G - Physics

01

R

324/58.03

G01R 31/08 (2006.01) G01R 27/18 (2006.01) G01R 31/02 (2006.01)

Patent

CA 1052864

DUAL CHANNEL DYNAMIC LINE ISOLATION MONITOR 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 current 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.

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