Improved unsynchronized two-end algorithm for locating faults in power transmission lines

A new two-end algorithm for locating faults in a single power transmission line is presented. Presence of the extra link between the line terminals is taken into account. A distance to fault is determined from unsynchronized measurements of voltages from both line ends and with additional, limited use of currents. Measured currents are utilized under the condition that they come from current transformers, which are not saturated. As a result of that, certain improvement of fault location - when comparing to the other known methods - is achieved. The delivered new algorithm has been tested with the fault data obtained from versatile ATP-EMTP simulations. The sample examples and results of fault location accuracy evaluation are reported and discussed in the paper.