Which of the following is true regarding lightly loaded transmission lines?

Lightly loaded transmission lines are often characterized by their ability to supply reactive power, particularly under conditions where the real power demand is low. When a transmission line is lightly loaded, the flow of alternating current (AC) through the line results in a condition known as capacitive behavior. This means that instead of consuming reactive power, which would be the case in an inductive scenario, these lines can generate or supply reactive power back into the system.

This phenomenon occurs because the capacitance of the line becomes more significant compared to its inductance, leading to a situation where it compensates for inductive loads elsewhere in the electrical system. Thus, lightly loaded transmission lines can help with voltage regulation and enhance the overall stability of the grid by supplying reactive power when it’s needed.

Understanding this behavior is critical for effective power system management, especially in ensuring that voltage levels are maintained and that the system operates efficiently.