“…However, the EaB measurement is a commonly used method to determine the degradation of polymers [24,25]. However, the EaB test is naturally destructive, and it requires samples removal; thus, it is not practical for on-site testing [2,5,10,26]. Therefore, non-destructive electrical-based condition monitoring techniques have been the focus of scientific interest, such as dielectric spectroscopy, return voltage measurement, and the polarization-depolarization current method [8][9][10]14,15,19,20,[26][27][28][29][30].…”