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| Research on Measurement Technology of Power Frequency Short-circuit Current of Transformer |
| MEI Guo-jian1,5,LI Chuan-sheng2,WANG Jia-fu2,ZHAO Ye-ming3,DONG Ping4,SHAO Hai-ming2,YAO Yan1 |
1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. Beijing University of Science and Technology Information, Beijing 100192, China
4. Shanxi Institute of Metrology, Taiyuan, Shanxi 030021, China
5. Zhejiang Province Institution of Metrology, Hangzhou, Zhejiang 310018, China |
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Abstract Aiming at the requirements of transformer power frequency short-circuit current measurement, the external integral Rogowski coil technology and fiber-optic current sensing technology are studied. The low-frequency mathematical models of the two sensors are established which based on MATLAB/Simulink to calculate the response characteristics of the sensor to the power-frequency short-circuit current. The results show that the measurement accuracy of the Rogowski coil for the power-frequency short-circuit current is affected by its lower cut-off frequency. If the cut-off frequency is lower, the measurement accuracy will be higher. The optical fiber current sensor can theoretically accurately reproduce the power frequency short-circuit current. Multiple current sensors are used for the field comparison test of the transformers power frequency short-circuit current. The results show that the current waveforms measured by the AC/DC current comparator, the fiber-optic current sensor, and the Rogowski coil with a lower cut-off frequency of 0.02Hz agree well, the measurement result of the lower cut-off frequency in Rogowski coil at 0.2Hz shows a significant deviation and could not be reset to zero, which is consistent with the simulation analysis conclusion. It is recommended that the lower cut-off frequency should be lower than 0.1Hz for the external integral Rogowski coil in order to ensure high-precision measurement; fiber-optic current sensor has excellent DC and low-frequency response characteristics, it is an ideal scheme for high-precision measurement of power frequency short-circuit current.
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Received: 30 January 2020
Published: 18 October 2021
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2021, Vol. 42 
