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It is believed that the lightning strike point of a large scale structure is dominated by the conjunction of the downward stepped leader and the upward connecting leader. The average height of conductors of the UHV transmission line is above 100m, and there is rarely report on the observation of positive upward leader initiated from ground wires or large bundle conductors in lightning attachment process...
The impulse breakdown delay of soil is significant for evaluating the lightning trip-out rate of transmission lines. This paper experimentally studied the impulse breakdown delay phenomenon of soil, the factors influencing the impulse breakdown delay phenomenon of soil are analyzed. At last, the influence of the impulse breakdown delay phenomenon of soil on the lightning protection characteristics...
For HVDC transmission system, the smoothing reactor has two structural types; oil-immersed core reactor and air-core reactor. The former needs to concentrate installed on DC-line, and the latter can be arranged flexibly on both pole line and neutral line. According to the different arrangements of smoothing reactors, the system steady-state performance and over-voltage of converter station have some...
An electromagnetic model was constructed to study lightning leader striking distance to horizontal conductors. Two kind of horizontal conductors were investigated, which are horizontal conductor connected to ground and free standing horizontal conductor. A comparison had been done between these two cases. A case of the horizontal conductor stressed by a DC voltage was investigated
This paper aims to calculate step and touch voltages around transmission line tower foot due to lightning strike to the transmission line tower top and injecting the lightning current into resistive/capacitive ground. The transmission tower foot is modeled as hemisphere electrode impeded in the ground with specific conductivity and permittivity. The step and touch voltages are calculated for different...
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