Abstract According to the lightning research results, which is based on the overhead line on viaduct in Tianjin Jinbin Light Rail Project, this paper summarizes the calculation method of lightning protection design which could be used for engineering design of ground and viaduct overhead line. Mathematics mode lightning striking on overhead line of viaduct and ground and calculation method sequence is proposed. In addition, the cases of overhead line suffered lightning in different thunderstorm days, different line height to the ground, and the overhead line out rate can be analyzed.


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