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Research of Electronic Current Transformer Based on Rogowski Coils

Author: ZhangShengWei
Tutor: RenHongLin
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Rogowski coil The hybrid electron current transformer Electronic current transformer power supply system Pulse current suppression
CLC: TM452
Type: Master's thesis
Year: 2009
Downloads: 167
Quote: 0
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Abstract


Electronic current transformer compared with the traditional electromagnetic current transformer, can not match the great advantages of bandwidth, insulation, and many other aspects of the cost of its theory and research has become a recent and future development of hot spots, which is based on the Rogowski coil The current transformer is to study a more extensive electronic current transformers. Conduct further research around key technologies in the Rogowski coil electronic current transformers practical process, is of great significance for promoting the improvement and development of the Rogowski coil current transformer. High-voltage bus voltage high current range, how to extract energy from the transformer high-voltage side and the regulator output is to study the Rogowski coil current transformer for energy issues one of the difficulties. To solve this problem, it is designed to take the coil, and battery-powered program. According to the energy principle of the establishment of the Energy Extracting the coil simulation model, and take the best turns coil optimized design and simulation. Battery design uses a lithium battery as the auxiliary power supply system. Finally, the power supply system simulation. The results show that, combined with the power supply scheme can effectively solve the energy supply problem of the high-voltage side of the transformer. Hollow Rogowski coil frequency response range, there is no magnetic saturation, but the small current measurement output signal is weak, vulnerable to the surrounding environment and its measurement accuracy. The traditional current transformer has a strong output signal, the measurement accuracy is not affected by the surrounding environment, but the existence of the core is easily saturated. In order to combine both advantages, the design the hybrid electronic current transformer using the combination of the two, and its high-pressure side of the signal processing system hardware design. According to the working principle of the hybrid electronic current transformer, the saturation point of the core-coil method of determining and transformer measurement signal processing algorithms. The hybrid electronic current transformer design can effectively improve the measurement accuracy, widening the amplitude of the current measurement and the band is far superior to the measurement of the effect of a single transformer. Pulse current of the circuit under test is one of the issues to be considered by design Rogowski coil electronic current transformers. Rogowski coil current transformer pulse current response simulation using multi-stage LC filter circuit interference suppression pulse current Rogowski coil electronic current transformers and to determine these parameters. Simulation results show that the proposed method can effectively reduce the current pulse Rogowski coil electronic current transformers, and has little effect on the measurement effect, provided technical support for the reliable operation of the Rogowsi coil current transformer.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Transformer > Current transformer
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