Professional Answer: The Ferranti effect is primarily caused by the line's distributed capacitance and inductance. In long, lightly loaded or unloaded transmission lines, the capacitive charging current becomes a dominant factor. This leading current flows through the line's series inductance, producing a voltage drop that is in phase with the sending-end voltage. This, in turn, causes the receiving-end voltage to be higher than the sending-end voltage.

As a leading manufacturer of overhead transmission line equipment and tools, we recognize the importance of this effect. Overvoltage due to the Ferranti effect can cause insulation failure, stress on our equipment, and damage to connected loads. Our solutions are designed to help our clients manage these risks and maintain a stable power grid.