Estimating lightning-induced overvoltages (LIOV) is essential for identifying the threat that lightning poses to power transmission networks and for contributing in the analysis of mitigation strategies. The effective role of shielding wires (SW) in decreasing lightning-induced overvoltage (LIOV) is investigated in this paper. It is observed that the positioning of SWs in relative to horizontal variation of phase conductors can effectively reduce the LIOV on phase conductors. The positioning of two SWs at height 13.05 m where as all three phase conductors are at height 10 m from the ground level and keeping 5.55 m horizontal separation between them i.e case 2 configuration will reduces LIOV on phase conductor 1 at starting terminal by 30.20 % and at end terminal 30.95 % and LIOV on conductor 2 is reduced by 34.71 % and 34.87 % also LIOV on conductor 3 is reduced by 31.72 % and 31.88 % respectively when compared to LIOV on phase conductors without installation of SWs. The lightning channel is modeled as a thin wire in order to compute LIOV, and the lightning electromagnetic fields (LEMF) are evaluated using a modified transmission line with exponential (MTLE) decay engineering model. The coupling equations are then solved using the finite difference time domain (FDTD) approach.
Shield Wires at Horizontal Configuration to Reduce the Lightning-Induced Overvoltages on Overhead Lines
31.07.2024
7625590 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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