Single-Phase-to-Ground fault is one of the main factors that affect high voltage power system security.When the capacitor current exceeds a certain value we have to take some measures to govern and compensate the capacitive currently.Therefore,the paper proposed a improved Single-Phase-to-Ground capacitance current calculation method which based on comprehensive consideration of cable factor,the weather factor and the high-voltage electrical equipment value-added factor.Finally,this paper verified the corre...