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- W2388081330 abstract "An improved leader progression method (LPM) based on long-gap discharge studies has been applied in the analysis of lightning shielding performance for EHV transmission lines. Because of the specificity and great importance of UHVAC transmission lines, the application of LPM in UHVAC transmission lines needs further studies. Considering the practical characteristics of UHVAC transmission lines, an improved LPM is proposed in this paper in which the leader inception criteria of the bundled conductors are modified. The shielding failure performance of the UHVAC transmission line of the Chinese Test Model Project with four types of towers is calculated. The lightning activity parameters in the right-of-way of the transmission line are adopted in the calculations. Partial shielding performance at different segments in a line span is also investigated considering the strict safety requirement of the UHVAC transmission lines. The research indicates that the side-distances and lightning currents of shielding failure for UHV transmission lines are obviously bigger than that for 500 kV EHV lines. The UHVAC line should be free of shielding failure brip-out under flatter terrain conditions. Undeer slope terrain condition, the maximum shielding failure trip-out rate of ZBS1 and ZBS2 towers (slope-terrain-type tower) is only 0.0012 times/(100km · a), which fulfills the design requirement. As a comparison, if the ZMP1 and ZMP2 towers (flat-terrain-type tower) were applied in slope terrain area, the shielding failure trip-out rate will reach 0.17 times/(100km · a). Considering the influence of the line sag, partial shielding failure performances at different segments in the same span are different, It indicates that the partially shielding failure performance analysis is necessary for important and special transmission line parts." @default.
- W2388081330 created "2016-06-24" @default.
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- W2388081330 date "2008-01-01" @default.
- W2388081330 modified "2023-09-23" @default.
- W2388081330 title "Analysis of Lightning Shielding Performance of 1000 kV UHV AC Transmission Lines Based on Improved Leader Progression Model" @default.
- W2388081330 hasPublicationYear "2008" @default.
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