The Influence of Temperature Characteristics and Aging of Capacitor Element on the Measurement Accuracy of Capacitor Voltage Transformer

The equivalent parameters of capacitor voltage transformer (CVT) will be affected by factors such as ambient temperature and aging during the operation of the equipment, resulting in CVT measurement error. In this paper, a capacitor element test platform and a CVT simulation platform are built to study the influence of ambient temperature and aging on the equivalent electrical parameters of the capacitor element and the CVT measurement accuracy. The simulation and experimental results show that the increase of temperature and degree of aging lead to the decrease of the capacitance value and the increase of dielectric loss of the capacitor element; the magnitude error and phase error of CVT both increase with the increase of temperature and degree of aging.