Resumen
System and method of detecting single-phase ground faults in electrical power networks with neutral isolated from ground or by means of an impedance of high ohmic value, which offers total selectivity in the detection of the zone in fault situation and is based on the comparison of the modules of the homopolar currents of the lines, with the fault line being the one with the largest current. In electrical systems with secondary substations, it is determined if the defect is in the secondary substation by comparing the sum of the modules of the currents of the power lines with the output lines. If there is a fault in the secondary substation, the fault line is determined because its homopolar current is the highest of all the output lines. (Machine-translation by Google Translate, not legally binding)