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717 / 2022-03-31 17:55:26
Research on Generation Mechanism and Variation Characteristics of Single-phase Ground Overvoltage in Medium Voltage Transmission Line
Single-phase grounding; arc grounding overvoltage; ferromagnetic resonance overvoltage; capacitive current; neutral point displacement voltage
9. Grounding Systems
终稿
shenyuan Zhao / ChengDu University of Technology
In the experimental research on the impact of 10-35kV wildfire and tree line faults on transmission lines, it was found that arc grounding overvoltage and ferromagnetic resonance overvoltage were generated. This paper studies and analyzes the mechanism of overvoltage generation. The arc overvoltage caused by single-phase grounding leads to different degrees of saturation of the three phases of the voltage transformer, which leads to the generation of resonant overvoltage. The research analyzes the three-phase voltage and zero sequence voltage caused by overvoltage. Variation characteristics, when resonance occurs, the random voltage of one phase is less than the voltage of the other two phases, and the magnitude of this voltage is determined by the neutral point displacement voltage; the moment of arc overvoltage will cause the amplitude of the zero sequence voltage and the non-fault phase voltage to be rapid within 0.6ms, the fault phase voltage is lower than the rated voltage, and presents a power frequency cycle change trend, this change can be used as the identification criterion of arc overvoltage. Modeling and simulation were carried out by PSCAD/EMPTC simulation software, and the variation characteristics of arc overvoltage between metal and high resistance grounding were verified, and the simulation results were basically consistent with the test results.
重要日期

  • 会议日期

    09月25日

    2022

    至

    09月29日

    2022

  • 08月15日 2022

    提前注册日期

  • 09月10日 2022

    报告提交截止日期

  • 11月10日 2022

    注册截止日期

  • 11月30日 2022

    初稿截稿日期

  • 11月30日 2022

    终稿截稿日期

主办单位
IEEE DEIS
承办单位
Chongqing University
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