What is the function of an AC kilovars meter?

An AC kilovars meter specifically measures reactive power, which is the power that oscillates between the source and the load in an alternating current (AC) system. Reactive power is measured in kilovars (kVAR) and is essential for understanding how well the AC system is performing, particularly in inductive loads like motors and transformers where there is a phase difference between voltage and current.

Reactive power is necessary to maintain the voltage levels required for active power (the real power doing useful work) to flow efficiently through an electrical system. By measuring reactive power, the kilovars meter provides valuable information about the system's efficiency and the ability to supply power, allowing operators to manage and optimize power factor correction. This helps prevent losses and potential overloading in the electrical infrastructure.

The focus of an AC kilovars meter is therefore distinct from the measurement of active power, which refers to the actual power consumed by devices, and from monitoring voltage levels or adjusting frequency output, neither of which falls within the primary function of this specific meter.