Taking Value Research of “Check Ice Case” in 15mm Icing Area Power Transmission Line Tower

This paper analyzes icing design regulation of domestic and foreign power transmission line tower and investigates distribution of 15mm icing area in Chinese power transmission lines and tower design practice on “check ice case”. Carry out calculation and comparison analysis on tower weight through selecting different “check ice value”, obtain the conclusion that taking 25mm as “check ice value” has less influence on increment of engineering investment, and further forward the suggestion that “check ice case” shall be considered when design wind speed is 23.5m/s and could not be considered when greater and equals to 25m/s.