What role does a capacitor bank play in a distribution system?

A capacitor bank plays a crucial role in a distribution system primarily by improving the power factor and reducing energy costs. In electrical systems, a low power factor indicates inefficiency; it means that a significant amount of energy is not being utilized effectively for work.

When capacitor banks are installed, they supply reactive power (VAR), which can counteract the inductive loads present in the system—such as motors and transformers. By doing this, capacitor banks help to balance the reactive power and reduce the phase difference between voltage and current. This leads to a higher power factor, which is beneficial for both the utility provider and the end users.

An improved power factor can lead to lower energy costs, as utilities often charge penalties for poor power factor readings. Additionally, operating with a higher power factor can result in reduced losses in the electrical distribution system, allowing for more efficient energy usage.

Other options, while they represent important functions in electrical systems, do not accurately describe the main purpose of a capacitor bank. Isolating faulty circuits is typically managed by circuit breakers or fuses, providing backup power is a function of generators or battery systems, and filtering electrical noise generally involves other components like filters or inductors. Thus, the primary role of capacitor banks is indeed