Yan Xu, Zhang Yijun, Du Sai, et al. Ground potential rise and transient response of the grounding grid based on the triggered lightning. J Appl Meteor Sci, 2020, 31(2): 247-256. DOI:  10.11898/1001-7313.20200211.
Citation: Yan Xu, Zhang Yijun, Du Sai, et al. Ground potential rise and transient response of the grounding grid based on the triggered lightning. J Appl Meteor Sci, 2020, 31(2): 247-256. DOI:  10.11898/1001-7313.20200211.

Ground Potential Rise and Transient Response of the Grounding Grid Based on the Triggered Lightning

DOI: 10.11898/1001-7313.20200211
  • Received Date: 2019-10-08
  • Rev Recd Date: 2019-12-25
  • Publish Date: 2020-03-31
  • It is extremely dangerous of ground grid potentials which significantly rise when the lightning currents are flowing through the grid. A statistical analysis on 39 return-strokes, 10 M-components and the ground potential rise (GPR) caused by them based on 7 triggered lightnings is carried out. According to the analysis, the geometric mean (GM) of the current peak values of 39 return-strokes is -12.78 kA, and the corresponding GM of GPR reaches -138.97 kV; the GM of the current peak values of the M-components is -0.60 kA, while the corresponding GM of GPR is -7.18 kV. There are distinct sub-peaks in the waveform of the GPR caused by the return-strokes, and the GM of the sub-peaks falls to -90.09 kV within several microseconds, about 64.86% of peak values. During the return stroke stage, the linear correlation coefficient of GPR voltages and the direct lightning current is 0.94, and the linear correlation coefficient of GPR voltages and the gradient is 0.55. It indicates that the GPR in return stroke stage is mainly caused by lightning current discharge in soil and the inductive coupling is relatively weaker. During the M-component stage, the correlation coefficient of peak value of GPR voltages and direct lightning current reaches 0.99, which means the GPR during M-component stage is mostly caused by lightning current discharge in soil. The impulse grounding resistance in the stage of return stroke when lightning current dispersing through grounding grids is 10.87 Ω, and it is 12.02 Ω in the stage of M-component. Both of the impulse grounding resistances are smaller than the DC grounding resistance, and the difference reaches 1.1 times. The minimum half-peak width of the GPR caused by the return-strokes is 0.44 μs, of which the GM is 1.93 μs, only 25.8% of the half-peak width of the corresponding current return-stroke. And the half-peak width of the GPR caused by M-components can be up to 2 microseconds, about 124 times of the GM of the half-peak width of the return-strokes, keeping the surge protective devices (SPD) running long which easily leads to crashing damages.
  • Fig. 1  The schematic of experimental layout

    Fig. 2  The current waveform of triggered lighting T0611

    (a)the current waveform of triggered lighting T0611, (b)the initial long continuous current of T0611, (c)M-components of T0611, (d)the return stroke of T0611

    Fig. 3  Triggered lightning current and the corresponding GPR at grounding grid of return strokes RS1-RS8

    Fig. 4  Proportional fittings of GPR with return strokes(a), gradient(b) and M-components(c)

    Table  1  Parameters of triggered lightning current

    特征参量 统计量 回击 M分量
    最小值 -5.61 -0.37
    雷电流峰值Ipeak/kA 最大值 -36.44 -1.77
    几何平均值 -12.78 -0.60
    最小值 0.14 67.70
    10%~90%上升时间t/μs 最大值 0.56 1946.29
    几何平均值 0.27 330.09
    最小值 2.56 106.00
    半峰宽度tHPW/μs 最大值 29.27 1141.78
    几何平均值 7.48 343.11
    最小值 16.40
    上升时间10%~90%之间的平均陡度G1/(kA·μs-1) 最大值 104.20
    几何平均值 38.46
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    Table  2  Parameters of GPR by triggered lightning current

    特征参量 统计量 回击引起的地电位抬升电压波形特征 M分量引起的地电位抬升电压波形特征
    最小值 -52.49 -4.28
    地电位抬升电压峰值Vpeak/kV 最大值 -321.05 -18.46
    几何平均值 -138.97 -7.18
    最小值 0.22 80.96
    10%~90%上升时间T/μs 最大值 0.73 2006.64
    几何平均值 0.29 403.99
    最小值 0.44 72.44
    半峰宽度THPW/μs 最大值 11.34 2031.49
    几何平均值 1.93 239.53
    最小值 125.17
    上升时间10%~90%之间的平均陡度G2/(kA·μs-1) 最大值 883.58
    几何平均值 379.22
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    • Received : 2019-10-08
    • Accepted : 2019-12-25
    • Published : 2020-03-31


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