What is the Ferranti Voltage Rise Effect?

The Ferranti Voltage Rise Effect refers specifically to the phenomenon where there is an increase in voltage at the receiving end of a long transmission line, particularly when the line is lightly loaded or under no load conditions. This effect is primarily observed in long, high-voltage lines, where the capacitive characteristics of the line can dominate the behavior of the system.

In a scenario where the transmission line is energized but open-ended, the capacitance of the line can lead to a rise in voltage as one moves away from the sending end towards the receiving end. When voltage rises due to this capacitive effect, it can exceed the sending-end voltage, particularly in situations where load is minimal.

Understanding this effect is crucial for system operators, as it can lead to challenges in voltage regulation and voltage stability on the network, which would otherwise be expected to drop under load conditions. This understanding helps in planning and maintaining the reliable operation of the electrical grid.