Difference between voltage transformer and capacitive voltage transformer?

A capacitor voltage transformer (CVT) is a transformer used in power systems to step down extra high voltage signals and provide a low voltage signal, for measurement or to operate a protective relay. Inductive voltage Transformers use conventional magnetic material for coupling of HV and LV circuit. This method has problems due to insulation of EHV circuit to the magnetic core( usually at ground potential) and very expensive to produce as it may need a few step down stages to achieve to final voltage ratio, each stage shall be floated at gradually reducedvoltage relative to ground potential.