Assessment of distribution line zero-sequence overcurrent protection inrush maloperation risk and corresponding countermeasure with 5G
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TM740

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    Abstract:

    The high zero-sequence inrush will be caused when the high-voltage built-in high-impedance transformer performs no-load closing, which may penetrate into the 20 kV distribution network with a grounding small resistance through the adjacent transformers, leading to the maloperation of zero-sequence overcurrent protection of distribution lines. This will result in the power loss of users. To solve this, the amplitude characteristics of high-voltage built-in high-impedance transformers are analyzed based on zero-sequence inrush formula. Then, the validity of the model and the possibility of protection maloperation are studied based on PSCAD/EMTDC simulation platform. At last, the calculation procedure for assessing risks of zero-sequence over-current protection in distribution networks is produced by MATLAB, where the actual parameter is used to quantitatively analyze the maloperation probability of zero-sequence overcurrent protection when a high-voltage built-in high-impedance transformer performs no-load energize. The experienmental results indicate protection operation situations. A protection blocking strategy based on 5G wireless communication technology is proposed and its feasibility is analyzed.

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彭业,金震,陈宏山,徐舒,罗长兵,侯炜,何进锋,陈俊.配电线路零序过流保护涌流误动风险评估及借助5G的应对策略研究[J].电力科学与技术学报英文版,2022,37(5):100-108. Peng Ye, Jin Zhen, Chen Hongshan, Xu Shu, Luo Changbing, Hou Wei, He Jinfeng, Chen Jun. Assessment of distribution line zero-sequence overcurrent protection inrush maloperation risk and corresponding countermeasure with 5G[J]. Journal of Electric Power Science and Technology,2022,37(5):100-108.

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  • Received:
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  • Online: December 01,2022
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