Modeling of Characteristics of Distance Relay Protection of High-Voltage Power Lines

The simulation of characteristics of the directional distance protection of high-voltage power lines is realized in the PSCAD/EMTDC software complex. The comparison of the characteristics of the distance protection with the circular and polygonal tripping characteristics is conducted by means of numerical simulation. The algorithm of the fault detector is developed. Such a fault detector prevents false tripping during oscillations of the power system and asynchronous motion of generators by means of controlling the vector increase of the negative sequence currents.