Question

What can be said about the sign of the reactive power fed into the line?

a. At low power levels, the line acts as an inductance (reactive power has a negative sign). The line's behaviour is then said to be below the natural level. At high power levels, however, the line acts as a capacitance (reactive power has a positive sign). The line's behaviour is then said to be above the natural level. The load itself neither consumes nor produces reactive power.
b. At low power levels, the line acts as a capacitance (reactive power has a negative sign). The line's behaviour is then said to be below the natural level. At high power levels, however, the line acts as an inductance (reactive power has a positive sign). The line's behaviour is then said to be above the natural level. The load itself neither consumes nor produces reactive power.
c. At low power levels, the line acts as a capacitance (reactive power has a negative sign). The line's behaviour is then said to be above the natural level. At high power levels, however, the line acts as an inductance (reactive power has a positive sign). The line's behaviour is then said to be below the natural level. The load itself neither consumes nor produces reactive power.

Answer 1

At low power levels, the line acts as an inductance with negative reactive power, being below the natural level. At high power levels, the line represents capacitance with positive reactive power, indicating being above the natural level. The load does not consume or produce reactive power.

Step-by-step explanation:

The sign of the reactive power fed into the line can indicate whether the line is acting as a capacitance or inductance and helps determine its behavior in relation to its natural level of operation. At low power levels, the line behaves as an inductance, which is associated with reactive power having a negative sign, indicating that the line is below the natural level. Conversely, at high power levels, the line represents capacitance with reactive power taking a positive sign, signifying the line to be above the natural level. It's important to note that the load connected to the line is considered not to consume or produce reactive power in this context.