TAILIEUCHUNG - Effect of transmission line configuration on the installation of surge arrester
As a transmission line has a specific configuration at an operating voltage, the installation of surge arresters thereof has to take into account the line configuration in order to achieve the best total flash rate. This paper deals with the characteristics in installing surge arresters in the 110 kV and 220 kV transmission lines in Vietnam. | Journal of Science & Technology 131 (2018) 049-054 Effect of Transmission Line Configuration on the Installation of Surge Arrester Ninh Văn Nam 1,3, *, Phạm Hồng Thịnh2, Trần Văn Tớp1 1 Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam 2 Underground Systems Inc., Milford, CT, USA 3 Hanoi University of Industry, No. 298, Cau Dien Street, Bac Tu Liem District, Hanoi Received: February 02, 2018; Accepted: November 26, 2018 Abstract As a transmission line has a specific configuration at an operating voltage, the installation of surge arresters thereof has to take into account the line configuration in order to achieve the best total flash rate. This paper deals with the characteristics in installing surge arresters in the 110 kV and 220 kV transmission lines in Vietnam. Best locations of surge arresters in a given line are determined by studying the effect of main parameters of the transmission lines, such as the type of tower, the number of shield wire, the number of surge arrester to be installed and the footing resistance. The total flashover rate of each transmission line was calculated by the electrogeometric model (EGM) and the electromagnetic transient program simulation (EMTP/ATP), which can be used as a practical guide for the utilities. Keywords: Coupling factor, transmission line, surge arrester, EMTP simulation 1. Introduction* surge arrester in the 220 kV line might no longer be valid in the 110 kV line. When a lightning stroke terminates on the shield wire, either on the tower top or on the mid-span, a part of the lightning current will flow to the ground via the tower while the remaining will propagate on the shield wire to adjacent towers. The propagation wave on the shield wire will induce a voltage on the phase conductor, which is characterized by the coupling effect. As described in [1], the coupling factor varies depending on the line configuration including the tower type, the footing resistance .
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