lt help mitigate any unwanted harmonics which is generated due to presence of connected capacitor banks . It is designed to be used with special high voltage capacitors and are rated in kVAr where the kVArrating is the kVAr of the capacitor that they are designed to be used with. It is important that the resonant frequency of this tuned circuit is not near a harmonic frequency. This is why the detuning reactor must match the detuned capacitor.
