Higher frequency performance of stress-grading systems for HV large rotating machines

This paper presents the results of numerical simulation and analysis of the characteristics of stress-grading systems of high voltage rotating machines against frequency. The stress-grading systems are optimally designed to minimize the local electric field enhancement at a discrete number of frequencies. The performance characteristics of each system are then generated and studied within a given frequency range. The potential distribution characteristics as well as the local electric stress, surface resistance, and the power dissipation characteristics are generated and studied against frequency.