Voltage monitor for alternating current power system

Details Voltage monitor for alternating current power system Voltage monitor for alternating current power system

G - Physics

01

R

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

Patent

CA 2100652

A voltage monitoring device for an AC power distribution system utilizes a liquid crystal optical shutter device capacitively coupled between a conductor of the system and electrical ground such that the transparency of the optical shutter device to light varies with the system voltage level. A light source projects a light beam through the optical shutter device 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 an output signal when the system voltage falls outside of a predetermined operating range.

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