The Influence of Orographic Conditions of Terrain on the Methodology for Calculating the Lightning Transmission of Overhead Power Lines

The influence of terrain in the calculation of lightning transmission of overhead power lines (overhead lines) is considered. Various variants of the representation of the relief of the overhead line route in the calculation method are proposed and structured. It is shown that the change in the char...

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Bibliographic Details
Published in:Russian electrical engineering 2023-08, Vol.94 (8), p.590-596
Main Authors: Kalugina, I. E., Temnikov, A. G., Chernensky, L. L., Gundareva, S. V., Voronkova, E. M., Mirzabekyan, G. Z.
Format: Article
Language:English
Subjects:
Discharge
Earth surface
Electric fields
Engineering
Leader currents
Machines
Manufacturing
Mathematical analysis
Power lines
Processes
Terrain
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Summary:The influence of terrain in the calculation of lightning transmission of overhead power lines (overhead lines) is considered. Various variants of the representation of the relief of the overhead line route in the calculation method are proposed and structured. It is shown that the change in the characteristics of the electric field created by a negative descending stepped lightning leader and a thundercloud, due to the peculiarities of the line route, can be taken into account in the methodology through a special array of coefficients characterizing the distortion of the electric field. The results of calculations implementing this approach are presented using the example of one of the variants of the orographic features of the route of the power line—the slope. The tendencies toward changing the parameters of the electric field created by the descending lightning leader at the location of the slope edge as the leader’s head approaches the Earth’s surface are established. It is shown that, as the head of the descending leader approaches the ground, there is an increase in the components of tension at the top of the slope, while the effect of field shielding (reducing tension) is active in the area under the slope. It is noted that taking into account the orographic conditions of the terrain in the method of calculating the lightning transmission of overhead lines not only affects the resulting probability of the formation of counter ascending discharges from overhead line elements, but also allows taking into account the possibility of the occurrence of ascending counter leading discharges.
ISSN:1068-3712
1934-8010
DOI:10.3103/S1068371223080096