Characteristics of Upward Leader Emerging From a Single-Phase Conductor With Different Voltage Class

In order to improve the shielding effect of the transmission line, the accurate line system design is significant. The electrogeometric model and leader progression model are two typical and most widely used numerical analysis models to analyze the shielding failure performance. However, both models call for more experimental evidence for accurate application. This paper investigates the characteristics of an upward leader emerging from 110-, 220-, 500-, and 1000-kV single-phase conductors through simulated experiments, and the conductor parameters and heights adopted are similar to the actual transmission lines in operation. The ac voltage generator is connected to the conductor to apply an operating voltage to the conductor. The influence of bundle number and conductor height on the upward leader is also discussed in detail. The obtained characteristics of an upward leader will be helpful to build appropriate numerical analysis models for the shielding failure of the transmission line.