The problems existed in measuring the lower segment coupling capacitor C11 and C2 and capacitance of capacitor voltage transformer（CVT） by way of series connection method are introduced based on the principle of superposition CVT without intermediate voltage leading-off terminal.Also

issues needing attention in every aspect and related to the test of capacitance and dielectric loss of CVT by way of self-excitation method are firstly and comprehensively analyzed

such as removal of high voltage lead and of secondary circuit

selection of secondary test terminal and of appropriate test voltage

etc

suggestions are proposed.The test results of self-excitation and conventional method are compared and the correctness of CVT self-excitation method at site is verified.