Abstract
As the upward leader from the transmission line plays a vital role in the interception of lightning downward leader, the proper description of upward leader characteristics is beneficial for improving the evaluation accuracy of lightning performance for UHV DC transmission lines. Based on the leader discharge theory, a novel numerical analysis model to simulate the inception and propagation process of positive upward leader from the transmission line was proposed. The model-based calculation results show good agreement with the data of laboratory long spark discharge, natural lightning observations and operation experience of transmission lines, which verifies the validity of this model. Moreover, the influence of operating voltage, protection angle and tower height on the upward leader characteristics for the typical UHV DC transmission line was analyzed. The results show that the lightning interception ability of upward leader from the positive polar conductor is enhanced with the increase of voltage level, protection angle, and tower height, which theoretically illustrates that installing the positive polar conductor closer to hillsides, adopting the negative protection angle and reducing the tower height are effective lightning protection measures for UHV DC transmission lines.
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