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Proceedings Paper

Optical current transducer and its signal processing analysis
Author(s): Erning Li; Yanbing Liu; J. M. K. MacAlpine; Benshun Yi
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Paper Abstract

Through the years a number of different optical systems for high voltage applications have been presented. The main field of interest has been devices replacing conventional current/voltage transformers utilizing the non-conductive nature of the optical components. The aim of the reported work was to develop an optical current transducer (OCT) based on the Faraday effect using bulk glass as the sensing element for high voltage applications. An OCT has been developed for utilization in 110 kV substation. A light beam circulates the electric conductor once and returns once. The optical path in the sensing element was designed approximately completely close. Therefore, the effect of the magnetic field, generated by other conductors adjacent to the conductor where the current to be measured was applied, can be eliminated to a high degree. Special attention is also put on the design of the signal processing system. A data acquisition and signal processing system with excellent linearity and high accuracy has been configured. The operating results show that the OCT is satisfactory under common conditions, whose accuracy is I multiplied by 0.2% plus or minus 0.1 A. Further efforts will be made to improve the OCT's stability. The sensor design, the signal processing system and the testing results are described in this paper. The system errors are analyzed.

Paper Details

Date Published: 24 September 1996
PDF: 6 pages
Proc. SPIE 2895, Fiber Optic Sensors V, (24 September 1996); doi: 10.1117/12.252158
Show Author Affiliations
Erning Li, Huazhong Univ. of Science and Technology (China)
Yanbing Liu, Huazhong Univ. of Science and Technology (China)
J. M. K. MacAlpine, Hong Kong Polytechnic Univ. (China)
Benshun Yi, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 2895:
Fiber Optic Sensors V
Kim D. Bennett; Byoung Yoon Kim; Yanbiao Liao, Editor(s)

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