In checking the voltage meter and safeness in the high voltage network systems a Capacitor Voltage Transformers or CVT can be used. They are responsible for the transformation of high to low voltage enough to be processed in measuring and protecting secondary equipment like relays and recorders.
Voltage Transformer or VT, usually used in metering and safeness in the electrical power industry separates the measuring instruments from the high voltage of the monitored circuit. Applications of CVTs in HV networks includes, measuring voltage and making accurate accepted transmitted voltage for revenue metering, protection and control, they guarantee insulation between HV network and LV circuits to safely control room operators and they are responsible for HF transmissions to be used for Power Line Carrier or PLC coupling.