Capacitor Two conductors isolated from each other and very close to each other can form a capacitor. Capacitors are energy storage components.
Cable-to-earth capacitance The cable is equivalent to one pole of the capacitor, and the earth is equivalent to the other pole of the capacitor. Air is the insulating medium, which produces a capacitive effect. The longer the cable, the closer the distance between the two and the greater the capacity.
Live cables and transformers have a certain distributed capacitance to ground, and the size of the distributed capacitance depends on the geometric size of the cable, the length of the cable and the insulating material.