Stressing of Transmission Tower Peak by Lighting

by Thazhath Veettil Gopalan, Deputy Dir.; Central Power Research Inst., Bangalore, India,

Serial Information: Journal of the Energy Division, 1979, Vol. 105, Issue 1, Pg. 103-115

Document Type: Journal Paper


A lightning stroke on the peak of a transmission line tower causes a current to flow to the ground through the peak members if the overhead ground wire is not connected directly to the ground electrode. The resultant electromagnetic forces cause a stressing of these members. The extent of stressing of the tower peak members due to these forces is mathematically analyzed. A typical tower peak is designed to withstand forces due to normal external loads. The failure of the tower peak so designed due to electromagnetic forces caused by lightning currents is illustrated with an example. The remedial measures to minimize stressing due to lightning currents are listed. An electrical connection between the overhead ground wire and the ground electrode or reinforcement of the tower peak are recommended to be the viable remedial measures.

Subject Headings: Light (artificial) | High-rise buildings | Power transmission | Power transmission towers | Remediation | Mathematics | Stress analysis | Load factors

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