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Information × Registration Number 0220U100535, 0118U003597 , R & D reports Title Improvement of energy security and reliability of the electricity supply system for consumers of high and ultrahigh voltage of the military-defense and industrial complex of Ukraine popup.stage_title Head Andrienko Petro D., Доктор технічних наук Registration Date 21-01-2020 Organization Zaporizhzhya National Technical University popup.description2  The object of research - electromagnetic and electromechanical transients in electric power systems. The purpose of the work is to increase the reliability, selectivity and sensitivity of the functioning of the relay protection of the prefabricated busbars of the distribution plants of electric stations and networks. The research method is experimental and analytical. The mathematical dependences of the change of current and angle errors of current transformers for their operating modes outside the normalized values ??of these errors were obtained and it was established that the current errors in emergency modes vary considerably to a greater degree than the angles, which allowed to substantiate the expediency of applying the differential-phase protection of tires and to determine, that this type of their relay protection has high sensitivity regardless of the amplitude values ??of emergency currents for internal short circuits. The method of differential-phase protection of tires has been improved, in which the algorithm of comparison of phase currents is applied as the only means of providing absolutely selective action of relay protection of tires. The mathematical model of differential-phase protection of tires is improved in which the comparison of the currents phases is carried out by determining the duration of the interval of coincidence of voltage logic impulses. The method of compensation of angular errors of current transformers in the differential-phase protection of tires in the case of their deep saturation in emergency modes in the part of providing an extension of logical voltage pulses is improved, thus absolute selectivity is not disturbed. RELAY PROTECTION, DIFFERENTIAL-PHASE PROTECTION OF THE BUS, TRANSFORMER OF THE CURRENT, EMERGENCY PROCESS Product Description popup.authors Andrienko Petro D. Danil`chenko Dmytro O. Kylagin Dmytro O. Kulagina Svetlana S. Nitsenko Volodimir V. Chernetsky Bogdan S. Shevchenko Sergii Yu. popup.nrat_date 2020-04-02 Close