For network operation, it is important to localize the fault as soon as possible after
system fault has been switched off in order to repair the damage. Because medium voltage
networks are usually spread over wide areas, fault-tracking information in km
or in reactive ohm is desirable for network operation after the system fault has been
tripped. For this reason, the fault locator, which can derive the fault distance from the
measured fault impedance, is also implemented in the distance protection. It calculates
the distance in km to the fault from the nominal value of the cable reactance.