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Development of an optical current transformer for adjustable speed pumped storage systems

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6 Author(s)
Fujimoto, T. ; Kansai Electr. Power Co. Inc., Osaka, Japan ; Shimizu, M. ; Nakagawa, H. ; Sone, I.
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The design and testing of a passive optical current transformer utilizing the Faraday effect is described. The optical current transformer (OCT) was developed to measure the rotor excitation current of a 400 MW adjustable speed pumped storage system. Overall dimensions of the bulk optic sensor are 250×250×40 mm and the OCT functions as an overcurrent sensor to a maximum current 35000 Ap . This OCT has been practically applied at the Ohkawachi Power Plant of the Kansai Electric Power Co., Inc. since December 1993

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Power Delivery, IEEE Transactions on  (Volume:12 ,  Issue: 1 )