Analysis on Lightning Withstand Level of Back Striking Flashover for Double-Circuit Transmission Line

Shi Jun Xie; Jian Ming Li; Yu Han Jiang; Yu Zhang

doi:10.4028/www.scientific.net/AMR.1070-1072.1050

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1070-1072Analysis on Lightning Withstand Level of Back...

Analysis on Lightning Withstand Level of Back Striking Flashover for Double-Circuit Transmission Line

Abstract:

The double-circuit transmission lines have already been the significant component of power system. Because of the symmetric insulation of the two circuits, the case that both circuits trip out often happens when the tower suffer lightning strike. And it harms the stability of power system and causes serious impacts to power equipments. In this paper, an electric-magnetic transient simulation model was established. Using this model, combining the analysis of physical mechanism of back striking trip-out, the influences of earth resistance, height of tower and length of insulator on the lightning withstand level of back striking (LWLBS) were clarified. The LWLBS of high tower is much low, therefore the relative high tower should be paid more attention to defense the back striking. Reducing the earth resistance and increasing the length of insulator can both upgrade the LWLBS observably. Especially, reducing the earth resistance can enhance the effect of upgrading the LWLBS by increasing the length of insulator.