Optical current transformer

Details Optical current transformer Optical current transformer

1996-04-23

1998-07-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, 324 96, 3242441, G01R 1507

Patent

active

057808457

ABSTRACT:
In an optical current transformer, an optical sensor is made up of two optical sensor units which are independent of each other. Incident light beams are applied to the optical sensor units, and the emergent light beams from the latter are subjected to addition, to obtain a measurement signal which is proportional to a current under test which flows in a conductor. The optical sensor units are substantially U-shaped bars, which are Faraday effect glass bars which are rectangular in cross section and have 45.degree. reflecting surfaces at the corners.

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ISA Transactions, vol. 28, No. 2, 1 Jan. 1989, US, pp. 15-17, XP000112434 Day G W et al.: "Optical fiber sensors for electromagnetic quantities".
Proc. Wescanex '95 Communications, Power, and Computing, vol. 2, 15-16 May 1995, US, pp. 329-333, XP000602982, J. Song et al.: "A Faraday Effect Based Clamp-on Magneto-optical Current Transducer for Power Systems".
Database Inspec, Insitute of Electrical Engineers, Stevenage, GB, Inspec. No. AN-4784772, XP002014758 & Proc. Conf. on Precision Electromagnetic Measurements Digest, Jun. 27, 1994-Jul. 1, 1994, US, p. 459-460, J. Song et al.: "Development of a clamp-on magneto-optical current transducer for power systems".
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