A new approach to high speed relaying based on transient phenomena

The authors present a new approach to the protection of a power transmission line based on transient phenomena following a fault inception. The main idea of the method is the use of a travelling wave line model which, by means of currents and voltages measured at one end of the transmission line, calculates the voltage distribution along the line. The algorithm consists of two main parts. One part is for the determination of the direction of a fault, and the second is the direct fault detection, which is independent of communication from the remote end protection. Verification of this method is carried out using digital simulation