Classification of Q(t) profiles to induced electrode charge, accumulated charge and leakage current charge

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 (tm) / Q (0)” which is the ratio of the initial charge amount Q (0) = CV and the Q (t) after time tm is introduced. An algorithm for classifying the electrode charge amount Q (0), the space charge accumulation amount Qspac (t), and the leakage current charge amount Qleak (t) using charge ratio is proposed and evaluated. © 2021 The Institute of Electrical Engineers of Japan.