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| An All-Digital On-Line Calibration System for High Voltage Current Transformer |
| Tong Yue1, Li Hongbin1, Zhang Mingming1, Yan Dong2, Wang Yong2 |
| 1. Huazhong University of Science and Technology Wuhan 430074 China 2. Henan Electric Power Research Institute Zhengzhou 450000 China |
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Abstract As the developing of electronics technology and digital signal processing, electronic current transformer is becoming mature. Because of its wide dynamic range and frequency band, and non magnetic saturation, the electronic current transformer is replacing the traditional current transformer in power system. As an application, an all-digital on-line calibration system for high voltage current transformer is proposed in this paper. It is based on a kind of high accurate clamp-shape air core coil for sensor and uses optical fiber transmission system for signal transmission and power supply. Finally it realizes the digital integrator and fourth-order convolution window algorithm for error calculation method by the virtual instrument in personal computer. This system can monitor high voltage current transformer on line, and improves the reliability of power system greatly. The experimental results show that, this system can reach the 0.05 accuracy class, and the on site operation results prove that it easy to operation and has high reliability.
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Received: 19 June 2009
Published: 04 March 2014
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2010, Vol. 25 
