Verification of a High Accuracy Optical Current Transducer with a Bulk Type Faraday Sensor

Abstract

This paper discussed an optical current transducer which had a bulk Faraday sensor inserted into a gapped iron core and porcelain insulator with built-in optical fibers.The Faraday sensor had Bi₁₂SiO₂₀ single crystals with right and left optical rotatory power to cancel out temperture dependency. And a 66 kV to 275 kV class insulator with built-in optical fibers was also confirmed to have the required optical transmission performance. A prototype 161 kV optical current transducer demonstrated 0.3 % class accurracy for metering.