As for the operation characteristics of series capacitor

the AC and DC electrical breakdown strength tests have been made to the series capacitor elements with different dielectric structure and the model of series section. The test data is statically analyzed

compared and the confidence of complete sample is estimated. The inter-pole withstand voltage and short time overvoltage at different test conditions as well as design margin at protection level voltage are estimated. And the ratio analysis of electrical breakdown point position distribution of the breakdown element is conducted.