C Conditions that occur in the Cawang PLN area, on average each substation with other substations has a distance of 3.71 km. This condition greatly affects the performance of the tool, because distance is closely related to the impedance value. From this condition, some substations still use distance relays. The distance relay has a weakness, namely when the distance is very short, the impedance value is very small. This very small impedance value is very difficult to detect by the distance relay because the resulting value is a non-numeric value so that the distance relay is not able to overcome this disturbance. From the weakness of the distance relay, the distance relay is replaced with a differential relay. Using differential current relays it is possible to detect non-numeric values. The advantage of using this relay is that the relay only compares the incoming current to the outgoing current, so that if there is a difference between the input current and the current Mara,out, the relay works for this electrical supply, only focusing on the relay conducting part. The use of this dl current relay is expectedincreasingly sensitive to gan guan