Pole slip protection on 400 kV transmission line

Major disturbances in power system might cause big electromechanical oscillations that can influence unwanted operation of different protection functions and lead to a loss of synchronism between generator groups located in two different parts of a power system. In such situations disconnection of subsystems in points closest to the electrical centre of oscillation proved to prevent collapse of a complete system. It is useful to use software for dynamic simulation of electric power systems to make quality control of critical clearing time in power system. The Eurostag Software is used in this article.