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A novel full compensation method for the ground fault current of resonant grounded systems

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Abstract

The traditional arc suppression coil cannot compensate for the active and harmonic component of the ground fault current nor fully suppress the intermittent arc. For improvement, a novel full compensation method for the ground fault current of resonant grounded systems is proposed. The impedance of the compensation component is calculated based on the phase-to-ground insulation parameters, which are precisely measured by injecting a characteristic current signal at the neutral point. When a ground fault occurs, the faulty phase is identified by the phase angle of the ground fault current. Then, the compensation component is put in between the lagging phase of the faulty phase and ground. The faulty phase voltage is suppressed to zero by the input of the compensation component, and the ground fault current is fully compensated. Simulative results indicate that the phase-to-ground insulation parameters of distribution networks are accurately measured by the proposed method. The proposed full compensation method suppresses the faulty phase voltage rapidly, and all the components contained in the ground fault current are completely compensated reliably. The intermittent-arc ground fault is suppressed effectively without being affected by the fault resistance.

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Acknowledgments

This work was supported in part by the National Natural Science Foundation of China (51737002), Scientific Research Project of Hunan Provincial Education Department (18K047) and Key Laboratory of Renewable Energy Electric-Technology of Hunan Province (Changsha University of Science & Technology).

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Authors and Affiliations

  1. School of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha, China

    Kun Yu, Zhanlei Liu, Xiangjun Zeng & Jiazheng Li

  2. Dongguan Power Supply Bureau of Guangdong Power Grid Corp, Dongguan, China

    Lei Yang

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  1. Kun Yu
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  2. Zhanlei Liu
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  3. Xiangjun Zeng
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  4. Jiazheng Li
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  5. Lei Yang
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Correspondence to Kun Yu.

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Yu, K., Liu, Z., Zeng, X. et al. A novel full compensation method for the ground fault current of resonant grounded systems. Electr Eng 103, 1569–1581 (2021). https://doi.org/10.1007/s00202-020-01144-x

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  • DOI: https://doi.org/10.1007/s00202-020-01144-x

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