Electric Power ›› 2021, Vol. 54 ›› Issue (3): 117-124.DOI: 10.11930/j.issn.1004-9649.202007068

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Transferred Ground Potential Characteristics of Independent Ground Networks Caused by One Artificially Triggered Lightning

CAO Xuefen1, CHEN Shaodong2, LIANG Hongyu1, GAO Wenjun3, LI Hejie3, CAI Zhanwen1   

  1. 1. Guangdong Technical Support Center of Meteorological Public Security, Guangzhou 510080, China;
    2. Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China;
    3. Guangzhou Meteorological Public Service Center, Guangzhou 511430, China
  • Received:2020-07-20 Revised:2020-08-26 Online:2021-03-05 Published:2021-03-17
  • Supported by:
    This work is supported by the National Key Research and Development Program of China (Experimental Study on Damage Effect and Protection of Lightning Stroke in the Whole Process, No.2017YFC1501506), and the National Natural Science Foundation of China (Experimental Study on Damage Mechanism of Zinc Oxide SPD Based on Characteristics of Lightning Discharge, No.41775007)

Abstract: Based on 10 return strokes of one artificially triggered lightning T179, the interaction of two independent ground networks and the characteristics of transferred ground potential(TGP) under the action of lightning current are analyzed, and the energy of SPD impacted by TGP is calculated and evaluated through the impulse low-voltage power surge protector (SPD). The results show that the generated peak TGP voltage at the ground network 40 m away is relatively large, reaching –10.9 kV on average. There is a very good positive correlation between the peak TGP voltage and the peak triggered lightning current with the correlation coefficient R2 reaching 0.97. The energy of impacting SPD is relatively small, with the average value of 10 return strokes being 1.5 J. It is therefore very safe to install SPD surge protector for electronic equipment.

Key words: artificially triggered lightning, independent ground grid, transferred ground potential, SPD residual voltage, ground wire current