ABSTRACT
This study utilized the hourly measured data from 94 automatic meteorological sites over the southern part of Hebei to drive the wire energy balance equation for an analysis of carrying-current capacity. Based on the analysis of the sensitivity of allowable maximum carrying-current capacity to the variation of ambient wind speed and air temperature, the study determined the probability density distribution of ambient air temperature and wind speed, obtained the regional probability distribution of allowable maximum carrying-current capacity, and evaluated the transmission capacity at several safety operation levels. It shows that at the 95% safety operation level, the maximum carrying-current capacity of LGJ-400/35 transmission line in South Hebei can be set to 945, 774, 795 and 1012A in spring, summer, autumn and winter, respectively.
