Optical current transformer

Details Optical current transformer Optical current transformer

1994-10-20

1996-01-30

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324117R, 295921, G01R 33032, G01R 1900, G02B 642

Patent

active

054882915

ABSTRACT:
An optical current transformer for measuring a current flowing through a conductor by transmitting a light beam about the current-carrying conductor includes four Faraday effect glass rods. For transmitting the light beam, the rods are arranged in a rectangle forming a through hole for the conductor. Three optical path changing pieces are included, each for redirecting the light beam from one of the glass rods to a different one of the glass rods, and each being positioned at a different corner of the glass rod rectangle. Two substrate plates, each having a through hole for the conductor, are positioned at opposite sides of the glass rod rectangle to sandwich the glass rods and the optical path changing pieces therebetween. The glass rods are substantially fixed while allowing for thermal expansion and contraction of the glass rods.

REFERENCES:
patent: 4564754 (1986-01-01), Sato et al.
patent: 4745357 (1988-05-01), Miller
patent: 5304920 (1994-04-01), Stierlin

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