Method to detect line-to-ground faults in high-resistance-ground networks

An Industrial-Power-Converter-System (IPCS) is a system made up of several power converters, such as Adjustable Speed Drive (ASDs), filters, and any kind of reactive power-compensation components. Today, an IPCS requires the ability to accurately detect and isolate electric faults to avoid further compromise of the integrity of the whole system. One particular type of electric fault is the cable line-to-ground fault. Due to the complexity and asymmetry of IPCSs, reliably detecting cable line-to-ground faults is a formidable task. Therefore, it is necessary to identify current/voltage signature uniquely linked to the occurrence of the fault. A filter realization to track specific harmonics is proposed.