Study on the Relationship between the Microtopography and Shielding Failure of Transmission Lines
LI Huiq · Insulators and Surge Arresters · 2014
Microtopography is one of the most important factors which affect the shielding failure of500 kA transmission lines. Based on Google Earth, this paper researches on the rule of how microtopography affects the lightning protection performance. Firstly, the author introduces how to form the KML files of transmission line. Secondly, according to the lightning failure statistic in southern Hebei grid, the affects of microtopography on lightning selectivity are statistically analyzed. Typical accidents such as farm pond, ridge top, hillsides and valley terrain conditions are analyzed, and the basic law of how the four kinds of microtopography factors affect the lightning protection performance of shielding failure for 500kA transmission lines is found.