Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-12-21
1994-11-08
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 324133, G08B 2100
Patent
active
053630882
ABSTRACT:
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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