What does reactive power support in electrical systems?

Reactive power is crucial in maintaining voltage levels within electrical systems. It does not contribute directly to the actual power (real power) that performs useful work but instead helps to manage the voltage levels over long distances in transmission lines. This is necessary because, in AC (alternating current) systems, voltage stability is pivotal for equipment operation and reliability.

When reactive power is present, it ensures that there is enough voltage to push the current through the system, thus supporting the flow of electrical energy. This becomes particularly important in systems with inductive loads, such as motors and transformers, which inherently require reactive power to function efficiently. Therefore, reactive power is fundamentally tied to voltage regulation in the grid or any electrical system, safeguarding against fluctuations and ensuring that the system operates smoothly and effectively.