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141 / 2022-07-05 16:48:29
Study on the Influence of Lightning Channel Wave Impedance on the Shielding Failure
Intruding wave overvoltage; Lightning channel wave impedance; Shielding failure; Traveling wave theory
High Voltage and Insulation Technology > Transients, grounding system, and EMC
Draft Rejected
Yuyang Luo / Huazhong University of Science and Technology；High voltage Engineering Department
Yudong Jiang / Huazhong University of Science and Technology
Fuchang Lin / Huazhong University of Science and Technology
Hua Li / Huazhong University of Science and Technology;School of Electrical and Electronic Engineering
The lightning channel wave impedance is scattered and the selection for lightning protection calculation is not unique. In order to study the influence of the lightning channel wave impedance on the lightning shielding failure intrusion wave overvoltage, based on traveling wave theory, the formation of lightning intruding wave is studied. Then, the equipment overvoltage at different electrical distances is analyzed when lightning channel wave impedance changes with examples. The results show that the lightning channel wave impedance's access makes the operating voltage propagates along the line, and the shielding failure wave is composed of the lightning surge component and the "operating voltage surge component". The "operating voltage impulse component" has the characteristic of chopped wave, and the severe case causes a surge with an amplitude of 2 times the operating voltage at the equipment, making it a threat to transformers and other winding equipment. For a typical 500kV line, when lightning channel wave impedance changes between 300Ω and 900Ω lightning striking the conductor, overvoltage has a more than 10% change. "Operating voltage impact component" cannot be ignored in substation lightning protection researches, and it is necessary to check with the statistical lightning channel wave impedance.
Important Date

  • Conference Date

    Nov 03

    2022

    to

    Nov 05

    2022

  • Aug 01 2022

    Draft paper submission deadline

  • Nov 04 2022

    Registration deadline

  • Nov 05 2022

    Contribution Submission Deadline

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Huazhong University of Science and Technology
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