Erosive discharges are also named Partial Discharge (PD) in high
voltage (HV) technology [1, 2] and can cause failure of HV components
such as capacitors, cables and inlet bushings. PD that appears inside
and outside of insulating materials is a persistent problem in power
industry. An internal PD is initiated in fault like cavities within
insulating material while external PD occurs at the the metal-insulator
interface. Both kinds of PD represent the same discharge type. This
discharge is known as Townsend electron avalanches which can develop
into streamers and micro-sparcs [3, 4]. Diverse electromagnetic (EM)
techniques were proposed for detection and monitoring of partial
discharge activity in high voltage infrastructure [5, 6].