Owing to the installation of autotransformers at regular intervals along the line, distance\nprotection relays cannot be used with the aim of locating ground faults in 2 Ã?â?? 25 kV railway power\nsupply systems. The reason is that the ratio between impedance and distance to the fault point is not\nlinear in these electrification systems, unlike in 1 Ã?â?? 25 kV power systems. Therefore, the location of\nground faults represents a complicated task in 2 Ã?â?? 25 kV railway power supply systems. Various\nmethods have been used to localize the ground fault position in 2 Ã?â?? 25 kV systems. The method\ndescribed here allows the location of a ground fault to be economically found in an accurate way\nin real time, using the modules of the circulating currents in different autotransformers when the\nground fault occurs. This method first needs to know the subsection and the conductor (catenary or\nfeeder) with the defect, then localizes the ground faultââ?¬â?¢s position.
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