High-altitude correction method for air insulation gap operating impulse voltage in power transmission line

The invention provides a high-altitude correction method for air insulation gap operating impulse voltage in a supervoltage compact power transmission line, which comprises the following steps of: (1) using a discharge correction formula: (see Figure), in the formula, Ka is an altitude correction factor; m is a correction factor of the altitude correction factor; H is altitude height, wherein H is not more than 2261 meters and not less than 23 meters; and (2) determining m according to the discharge voltage value U, m=2.73-0.00153U (U is not more than 1.7 and not less than 1.1), wherein U is operating impulse voltage, with the unit of trillion volt. The method corrects the over-voltage required value of a line in the high-altitude region to the altitude 0m and then uses a relationship curve of the air gap in the region of altitude 0m and the discharge voltage to determine the distance of the air gap in the line, namely the air gap required by the operation of the line in the high-altitude region. Within the s