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8C1 - The laser current transformer for EHV power transmission lines

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5 Author(s)
Saito, S. ; Institute of Industrial Sci., Univ. of Tokyo, Tokyo, Japan ; Fujii, Y. ; Yokoyama, K. ; Hamasaki, J.
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A current measuring device applicable to an extra-high voltage power transmission line higher than 500 kV is proposed with preliminary experimental results. It obtains the instantaneous magnetic field ajacent to a transmission wire by measuring the angle of Faraday rotation of a laser beam in a flint glass rod. The laser beam is transmitted and analyzed at a ground potential site, and in the energized part this device has neither insulated conductors nor active elements. An experimental laser current transformer yielded a sensitivity of 66 mV per 100 A and good linearity. Various sources of error and modifications are discussed.

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Quantum Electronics, IEEE Journal of  (Volume:2 ,  Issue: 8 )