Capacitor voltage transformer possesses all functions of electromagnetic type voltage transformer and

compared to the later

has such advantages as carrier and high dielectric strength.In this paper

the structural principle of 110 kV capacitor voltage transformer is introduced

the test method for medium loss and capacitance test and polarity etc.are discussed.The difference with existing test method are pointed out

then analyzed and compared

which provides more methods complying with safety requirement of field test to the test of CVT

especially to the test of CVT with medium voltage terminal without lead out tap.