Abstract
Transmission of electrical energy is the most important component of an electric power system. Optimization, modernization of the electric power transport system, increasing the capacity, as well as variability of connection arrangements, while maintaining the required level of reliability and safety, is regarded today as an urgent task for the energy industry as a whole. The article is devoted to the problem of determining the efficiency of the circuit design solution for a double-circuit three-phase power transmission line with an additional mode of operation — «with a split back-up phase» and determining its main reliability indicators. A circuit design solution for a double-circuit power transmission line with expansion of operating modes is presented in detail. The functional redundancy of the transmission line in accordance with the circuit design solution is based on switching of a conventional double-circuit power transmission line in the emergency mode to the single-circuit split-phase mode, which is the second working circuit. The ways of increasing the natural power of a double-circuit power transmission line are considered. The results of calculation of the capacity of a line with a split back-up phase and a comparison of the main parameters of overhead transmission lines with an additional mode of operation — with a split back-up phase — and power lines in conventional modes of operation, are presented. The results of calculations of reliability indicators are presented, such as the probable relative number of hours of interruption of power supply and the undersupply of electrical energy. A comparison of options have shown that the probable relative under-supply of the electric power of a double-circuit overhead transmission line with an additional operating mode — with a split back-up phase, is lower by approximately 13% than that of a conventional double-circuit power line, which will positively affect the maneuverability and reliability of the entire system.
Highlights
Передача электрической энергии является важнейшей составляющей электроэнергетической системы
The article is devoted to the problem of determining the efficiency of the circuit design solution for a double-circuit three-phase power transmission line with an additional mode of operation — «with a split back-up phase» and determining its main reliability indicators
A circuit design solution for a double-circuit power transmission line with expansion of operating modes is presented in detail
Summary
Throughput capacity, MW этом обеспечиваются симметрии пол- Двухцепная ВЛ в ных сопротивлений и напряжений по фазам. 118,7 на рабочей цепи составляющие «РРФ» Двухцепная ВЛ в объединяются коммутирующими вы- режиме с «РРФ» ключателями и автоматически при- Double-circuit line. 1 — опора; 2–7 — траверсы; 8–13 — гирлянды подвесных изоляторов; 14–16 — фазные провода рабочей цепи; 17–19 — «резервная фаза» расщепленная на три составляющие токопровода; 20–41 — выключатели нагрузки Figure. Учитывалось, что двухцепная ВЛ — на одной опоре. — мощности, передаваемые рассматриваемой линии, и мощности, передаваемые одноцепной ВЛ при плановых и аварийных ремонтах соответственно. Что плановый ремонт не производится в период максимальной нагрузки, поэтому принято tпр = 0,7·Pmax. На основе анализа нормативов по проведению ремонтных работ принято, что для рассматриваемой электропередачи, кроме одноцепной ВЛ с трехфазным управлением, отключение напряжения необходимо в 20% от годового объема работ (T0 = 0,2·Tпр ). Failure flow parameters and recovery time of overhead power lines due to equipment failure
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