Circuit Model of Q(t) Data at High Temperature and Evaluation of Delay Parameters

The use of DC power equipment in the industry has significantly increased in recent years. Consequently, it has become imperative for insulation materials to withstand high DC electric fields. The current integration method, Q(t) measurement, is one of the most useful and effective methods for measuring the time dependency of charges. However, the mathematical and physical models of Q(t) measurement remain undeveloped because acquired data are not completely analyzed, particularly the effect of delay parameters on the charge saturation time of insulators. Therefore, this study analyzes the delay characteristics of Q(t) data at a high temperature by solving differential equations with some approximations. In addition, experiments are performed using polyimide sample sheets. Consequently, the parameters defining the charging dynamics across different stages are determined, and the proposed approach can effectively estimate circuit properties data. Moreover, the results indicate that actual experimental data can be reconstructed using adequate parameters. Therefore, the proposed analysis method can be used for further discussions regarding the analytical estimation of charge saturation time, marking a significant advancement in the industry.