Reactive power control relays are designed for the purpose of reducing the reactive powers (inductive and capacitive) not used by the loads and drawn from the network. If inductive power is drawn from the network, it intervenes by drawing capacitor in the suitable value. If the capacitive power is drawn from the network, it intervenes by drawing shunt reactor in suitable value. It tries to reduce the inductive/active and capacitive/active rates of the system this way.
It is designed to make more sensible compensation at the unbalanced inductive and capacitive systems with RGT-MT18 TCR (SVC) step.