Analysis of back-flashover lightning- withstanding level of 500-kv-double-circuit transmission lines

This chapter analyzes the lightning performance of 500-kV-double-circuit transmission lines by the Alternative Transient Performance-Electromagnetic Transient Program (ATP-EMTP). With towers using the multi-wave impedance model and eliminating voltage reflection on the lines by a matching resistor, a simulation method has been established to evaluate the factors that may influence the backflashover voltage such as tower height, tower footing resistance, and conductor phase arrangements. A statistical method is presented to calculate the line trip-out rates due to back-flashover. The results show that the impact of phase arrangements on the back-flashover trip-out rate of a single-circuit line is little, but significant on the double-circuit lines. © Springer International Publishing Switzerland 2015.