АЛГОРИТМ ОПРЕДЕЛЕНИЯ ПОВРЕЖДЕННОЙ ФАЗЫ ПРИ ОДНОФАЗНОМ ЗАМЫКАНИИ НА ЗЕМЛЮ В СЕТЯХ С ИЗОЛИРОВАННОЙ НЕЙТРАЛЬЮ

Abstract

Relevance According to various studies, single-phase earth faults in networks with isolated neutral account for up to 75 % of all types of damage. At the same time, a significant part of single-phase short circuits turn into multiphase short circuits. Currently, various algorithms are being developed for relay protection against earth faults and determining the location of damage, for which it is necessary to know the damaged phase. Incorrect determination of the damaged phase will lead to a malfunction of these algorithms. Aim of research Development of an algorithm for determining the damaged phase in single-phase earth faults and its functional scheme and the study of the developed algorithm on the model. Research methods Simulation modeling is implemented in the Matlab Simulink software package. Results The factors affecting the operation of devices that determine the damaged phase in single-phase earth faults by the lowest value of the phase voltage are evaluated. An algorithm for determining the damaged phase and its functional scheme have been developed. With the help of simulation modeling, studies were carried out that showed the efficiency of the developed algorithm.