Заглавие:Влияние на състоянието на изправителните вериги на възбудителната система върху асинхронния режим на турбогенератори тип ТВВ-220-2А
Автор:Калчев, Стоян Калчев; Kalchev, Stoyan KalchevДата:1998Резюме:A specific asynchronous mode of generators type TVV-220-2A is considered when the excitation coil is closed through diodes and by-pass RC-circuit. The equations of stator and rotor electrical circuits are written in full and simple form and the results are given in tables and graphics. The result shows when by-pass RC-circuits are used, the ...
Заглавие:Защита при асинхронен режим на мощни синхронни генератори
Автор:Вичев, Станимир Трифонов; Калчев, Стоян Калчев; Vichev, Stanimir Trifonov; Kalchev, Stoyan KalchevДата:1998Резюме:This paper describes the selection of optimal characteristics and settings of the out-of-step protection of large synchronous generators under different faults of the excitation system. The investigation of these faults for generators type TVV-220-2A provide a possibility for selection of operation characteristic which detects the out of ...
Заглавие:A simple interval method for DC tolerance analysis
Автор:Kolev, Lyubomir Varadinov; Колев, Любомир Варадинов; Nenov, Ivo P.; Владов, Симеон рец.Дата:1998Резюме:In this paper, the worst-case tolerance analysis of dc linear electric circuits is lered. A simple method for handling the problem is sugested which reduces to inverting tatrices and solving one system of linear equations. The method is more efficient comonwise than other known methods, providing solutions of sufficient accuracy.
