Patent ID: 6466031
Filing Date: 2002-10-15
Classification: G01R

Abstract:
A method for locating a fault in a transmission line, the transmission line comprising a sending end and a receiving end, a plurality of tapped loads, each of the plurality of tapped loads connected to the transmission line at a tap node, the sending end comprising a measuring device, the receiving end comprising a measuring device, the method comprising:obtaining measured circuit parameters including measured pre-fault and faulted current and voltage values at the sending end and at the receiving end of the transmission line; calculating an equivalent tap node location using measured current and voltage values at the sending end and at the receiving end of the transmission line, the equivalent tap node location dividing the transmission line into a sending side and a receiving side; calculating an equivalent tapped load impedance of the plurality of tapped loads at the equivalent tap node location; calculating a first fault location assuming that the fault is located on the sending side of the equivalent tap node; calculating a second fault location assuming that the fault is located on the receiving side of the equivalent tap node; and selecting the calculated fault location from one of either the first fault location and the second fault location, by selecting the fault location having a value within a predetermined range.