What is the role of capacitor banks during system load restoration?

The role of capacitor banks during system load restoration is primarily to improve voltage levels immediately. Capacitor banks are employed to support voltage stability and enhance reactive power within the system. When a system experiences a load restoration, capacitor banks can quickly engage to provide reactive power support, thereby stabilizing voltage levels as the load is increased.

Keeping capacitor banks off until sufficient load is restored would not take advantage of their ability to support voltage levels during the restoration process. Engaging the capacitor banks earlier in the load recovery helps manage voltage fluctuations caused by sudden increases in demand. This is essential for maintaining the reliability and stability of the electrical grid during periods of restoration when changes in load can lead to voltage instability or sag. Therefore, the correct answer reflects the primary function of capacitor banks in maintaining voltage levels during system transitions.