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| An Online Calibration System for High Voltage Electronic Current Transformers |
| Li Zhenhua1, Li Hongbin1, Zhang Qiuyan2, Luo Pandian1 |
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China;
2. Electric Power Test & Research Institute of Guizhou Guiyang 550002 China |
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Abstract Electronic transformers are widely used in intelligent substations for their digital output and wide bandwidth. However, as a new technique, its failure rate is higher than that of traditional transformers. So the calibration period should be shortened. Traditional calibration methods need the power to be cut off, which lead to a complicated calibration process and loss of power outage. For this reason, this paper proposes an online calibration method for electronic current transformers. The high accuracy standard current transformer and online operation mode are the key technologies. A combined clamp-shape coil based on clamp-shape iron core coil and clamp-shape air core coil was designed as the standard. By analyzing the characteristics of the two clamp-shape coils, the combined coil can realize self-calibrating. So the accuracy of the system can be guaranteed. Employing the earth potential working method and using insulating rods to connect the transformer to the high voltage bus, the calibration becomes simple and safe. Tests in National Center for High Voltage Measurement and field tests show that the proposed online calibration system has a high accuracy of 0.05 class.
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Received: 10 April 2013
Published: 05 August 2014
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2014, Vol. 29 
