Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1992-12-21
1995-04-11
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324133, 310303, G01R 104
Patent
active
054061954
ABSTRACT:
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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Bowser Barry C.
Wieder Kenneth A.
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