Analysis of resistance disturbance capability of optical current transformers

作者：Yu Wen Bin^*; Zhang Guo Qing; Lu Zhong Feng; Wang Gui Zhong; Guo Zhi Zhong

来源：Power System Protection and Control, 2012, 40(12): 8-12+18.

• Differential sensors
• Light path
• Magnetic crosstalk
• Measurement precision
• Optical current transformer
• Phase spacing
• Primary structures
• Resistance disturbances
• Smart substations

The closed light path structure and the straight through light path structure are the two primary structures of optical current transformers based on Faraday magnetic-optic glass. The advantages of optical current transformers based on the straight through light path structure are obvious on the machining difficulty and the stability. But the disadvantages are also obvious on the conductor positional sensitivity and the resistance disturbance capability. In this paper, the differential optical current transformer is proposed. The influence of the conductor positional change and the magnetic crosstalk on the measurement precision is analyzed. The results show that the differential optical current transformer used in smart substation with phase spacing more than 0.8 m can absolutely achieve the measurement precision of 0.2-level without special shield.

• 出版日期2012