A METHOD TO ELIMINATE BIREFRINGENCE OF A MAGNETOOPTIC AC CURRENT TRANSDUCER WITH GLASS RING SENSOR HEAD

This paper reports a novel method of assembling a magneto-optical curr ent transducer, which can eliminate both thermal transient and constru ction-caused birefringence to a large extent. The method is simple and practical, and needs no temperature compensation in signal processing With a closed aluminum shell, sensing material buffers and flexible c onstruction, the accuracy of the compromise-developed MOCT with glass ring sensor head was better than 0.3% over a temperature range of -30 to 70 degrees C and current range from 100 to 2,400A. The field testin g verified this performance.