АЛГОРИТМ ВЫЧИСЛЕНИЯ ЕМКОСТНЫХ ТОКОВ ПРИ ОДНОФАЗНОМ ЗАМЫКАНИИ НА ЗЕМЛЮ, ИСПОЛЬЗУЮЩИЙ ПАРАМЕТРЫ АВАРИЙНОГО И ДОАВАРИЙНОГО РЕЖИМОВ

Abstract

Relevance Single-phase earth faults are the most common type of damage in networks with an isolated neutral. At the same time, there are no universal solutions for localization and search of single-phase circuits. The availability of information on the capacitive currents of a damaged line can become the basis for the development of new relay protection and automation algorithms for the localization and elimination of single-phase short circuits in networks with an isolated neutral. The current trend in 6–35 kV distribution networks is the development and implementation of intelligent power grid technologies that allow for high-precision measurements and data transmission. The article presents, developed by the authors, an algorithm for calculating capacitive currents in single-phase earth faults using technologies of intelligent electrical networks. Aim of research Development of an algorithm for calculating capacitive line currents in single-phase earth fault using the parameters of emergency and preemergency modes. Creation of a simulation model of a device implementing the developed algorithm, and subsequent evaluation of the algorithm based on the results of simulation modeling. Research methods The study of the developed method was performed in the Matlab Simulink software package. Results An algorithm for calculating capacitive currents in a single-phase earth fault using the parameters of emergency and pre-emergency modes is presented and described in detail. The conducted studies of the developed algorithm using simulation modeling have shown high accuracy in calculating capacitive currents in the single-phase earth fault mode.