Research on power supply for active electronic voltage transformers

PENG Bacui
（College of Electricity and Information Engineering， Hunan University，Changsha 410082，China）

Abstract： Aiming at the capacitor voltage transformer in high voltage side of the power supply， a new method was proposed， combined power supplying method of obtaining power from the main power line by a small CT and by a capacitive voltage divider in parallel with the PT，to supply power for electronic voltage transformers with sourceIts structure， principle， syntony and the mechanism of energy transfering were  analyzed， as well as the influences of the auxiliary power to the EVT's accuracy and reliability of the workThe results indicate that the method has good feasibility through the experimental simulation,and can efficiently solve the technical difficulties to attain the energy from the buses.
Key words： electronic voltage transformers（EVT）;power supply; power from CT;capacitive voltage divider;PT