220-kV combined optical transformer

Ying Cui; Miaoyuan Ye; Yong Zhu; Yan Xu; Sunan Luo

doi:10.1117/12.401737

3 October 2000 220-kV combined optical transformer

Ying Cui, Miaoyuan Ye, Yong Zhu, Yan Xu, Sunan Luo

Proceedings Volume 4220, Advanced Photonic Sensors: Technology and Applications; (2000) https://doi.org/10.1117/12.401737
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

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.

Citation Download Citation

Ying Cui, Miaoyuan Ye, Yong Zhu, Yan Xu, and Sunan Luo "220-kV combined optical transformer", Proc. SPIE 4220, Advanced Photonic Sensors: Technology and Applications, (3 October 2000); https://doi.org/10.1117/12.401737

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