Classification of Q(t) Profiles to Induced Electrode Charge, Accumulated Charge and Leakage Current Charge

Abstract

The direct current integrated charge method (Q(t) method) is a useful method to understand dielectric properties of insulating materials with a simple treatment. As total currents flowing through the insulating material are integrated by a capacitor, Q(t) data include various information about the material in them. To understand the Q(t) data, especially from the view point of electric charge behaviors, a parameter “charge ratio Q(t_m)/Q(0)” which is the ratio of the initial charge amount Q(0)=CV and the Q(t) after time t_m is introduced. An algorithm for classifying the electrode charge amount Q(0), the space charge accumulation amount Q_spac(t), and the leakage current charge amount Q_leak(t) using charge ratio is proposed and evaluated.