Journal of Electrical Engineering ›› 2017, Vol. 12 ›› Issue (7): 1-7.doi: 10.11985/2017.07.001

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Calculation of the Temperature Rise of Conducting Branches in a Lightning Protection System of a Building Subjected to Lightning Current Impulses

Wang Jie1,Sheng Caiwang2,Tong Da1,Yang Lei1,Wang Junjie1,Yang Wenbao1   

  1. 1. Ji Bei Electric Power Maintenance Company of State Grid Beijing 102488 China
    2. Global Energy Interconnection Research Institute Beijing 102211 China
  • Received:2016-02-21 Online:2017-07-25 Published:2019-11-25

Abstract:

In order to estimate the temperature rise of conducting branches in a lightning protection system of a building under lightning current, two mathematical models for the temperature rise of conductors were proposed. The models used to estimate the temperature rise in cylindrical conductors assumed both a uniform and non-uniform current density distribution by taking into account the transient skin effect. According to the two models, the temperature rise of the third conducting branch subjected to three different amplitude lightning currents was worked out. When the amplitude of lighting currents is 100kA, 150kA and 200kA, respectively, the temperature rise of the conductor calculated based on the first model is 2.25, 5.1 and 9.19 degree centigrade, respectively, and the temperature rise under the second model is 2.75, 6.18 and 11 degree centigrade, respectively. In addition, verification of the mathematical results were studied. The measured results in the literature are consistent with the results from the mathematical models. It is convincingly shown that conducting branches can be influenced by the transient skin effect. The additional temperature rise however, caused by the transient skin effect, is minimal, and can be neglected.

Key words: Lightning protection system, lightning current, temperature rise, conducting branches, current density, transient skin effect

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