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Proceedings Paper

220-kV combined optical transformer
Author(s): Ying Cui; Miaoyuan Ye; Yong Zhu; Yan Xu; Sunan Luo
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Paper Abstract

The magneto-optic current and electro-optic voltage sensing technologies were combined into a single phase unit which provides a new solution for combined current and voltage sensing and relaying applications. It senses voltage and current by making utilities of Pockels electro-optic effect of a BGO(Bi4Ge3O12) crystal and Faraday magneto-optic effect of a close-loop flint. The 220 kV high voltage is directly applied on the BGO crystal without capacitive dividers. This design permits true optical voltage measurement to be performed for the highest possible accuracy and stability. In the current sensor, a light beam circles around the current carrying conductor. The effect of the location movement of the conductor and external magnetic field are reduced. It has superior advantages of compact size, light- weight and better performance compared with conventional current and voltage transformers. Composite bushing consisting of a fiberglass tube support and silicone rubber that is filled with SF6 gas is employed for HV insulation. Connections between the Combined Optical Transformers in the substation and the metering and protecting unit in the control house are via optical fiber cable. The fundamental principal, system design and test result of this new 220 kV Combined Optical Transformer will be introduced in this paper.

Paper Details

Date Published: 3 October 2000
PDF: 5 pages
Proc. SPIE 4220, Advanced Photonic Sensors: Technology and Applications, (3 October 2000); doi: 10.1117/12.401737
Show Author Affiliations
Ying Cui, Huazhong Univ. of Science and Technology (China)
Miaoyuan Ye, Huazhong Univ. of Science and Technology (China)
Yong Zhu, Huazhong Univ. of Science and Technology (China)
Yan Xu, Huazhong Univ. of Science and Technology (China)
Sunan Luo, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 4220:
Advanced Photonic Sensors: Technology and Applications
Jinfa Tang; Chao-Nan Xu; Haizhang Li, Editor(s)

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