Phase-to-phase voltage monitor for three-phase power...

Details Phase-to-phase voltage monitor for three-phase power... Phase-to-phase voltage monitor for three-phase power...

G - Physics

01

R

G01R 19/165 (2006.01) G01R 15/24 (2006.01) G01R 29/16 (2006.01)

Patent

CA 2100653

A voltage monitoring device for a three-phase ungrounded delta-connected power system utilizes liquid crystal optical shutter devices capacitively coupled between phases of the system such that the combined light transparency of the optical shutter devices varies with system phase-to-phase voltage. A light source projects a light beam through the optical shutter devices to a light detector such that the output of the light detector is dependent on the system voltage. A control circuit responsive to the output of the light detector provides a control signal when the system voltage falls outside of a predetermined operating range.

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