Factors affecting performance of cylindrical capacitive ring divider

Abstract

Cylindrical capacitive ring is a commonly used voltage divider structure in electronic voltage transformers. The capacitance of the capacitive ring is affected by its geometric structure, temperature, and other aspects, and thus directly affects the performance of the voltage divider formed by the capacitive ring. In this paper, a calculation model of the capacitive ring is established. The simulation method is used to study the capacitance value of the capacitive ring influenced by the change of conductor length and the eccentricity between the axis of the primary conductor and capacitive ring. The influence of the auxiliary electrode on the capacitance of the capacitive ring and the accuracy of the divider is also analyzed. Calculation shows that only with the auxiliary electrode, the ideal value of the capacitance ring may be close to the calculated value. Finally, the test results for the prototype are given.