I. Introduction
Pulsed power is characterised by a fast HV pulse on the nanosecond order [1]–[9]. With polymeric materials, widely applied in pulsed power systems [10], damage to the insulation barriers of the polymers is inevitable [11]. When a pulse voltage is applied on polymers, the charge attaches to the surface with nanosecond rise time [12]. During the rise time of the pulse voltage, the charge accumulates on the surface at high density. Hence, charge accumulation associated with the rise time may enhance the static field near the electrode, which can cause discharge [13]. Damage to the insulation system might occur with these discharges [14]. Therefore, the nanosecond rise time of pulse voltage plays a dominant role in damaging polymeric materials in pulsed power systems by way of surface charge accumulation.