Formation of Orthogonal Components of Input Currents in Microprocessor Protections of Electrical Equipment

The methods used in the microprocessor protection of electrical equipment for forming orthogonal components input currents ensure their reliable isolation after changing mode followed by one or more periods fundamental frequency. This is due to inertia functional elements, particular, digital frequency filters, as well saturation steel magnetic cores current transformers. To increase speed selection currents, it proposed form them equivalent ones terms cosine and sine obtained using Fourier filters multiplying resulting coefficient. method that has been developed determining specified coefficient provides compensation delay caused highly effective modes strong core with a complex action presence an aperiodic component large damping time constant. evaluation efficiency was performed model implemented dynamic modeling environment MatLab-Simulink. As result studies, found absence transformers, small medium degree saturation, properties close those had previously proposed. With obtaining values these increased 1.5–2 times.