Дослідження роботи вольтододавальних трансформаторів в статичних режимах

Abstract

Design and experimental studies of the operation of booster transformer thyristor-controlled transformers in different modes are presented. The nature of the change of the module, phase and harmonic components of EMF and currents in the transformer windings is determined, their quantitative estimation and recommendations for management of its modes of operation are given. To quantify processes in BT, computational studies were conducted using the Scilab program. In order to simplify the calculation and increase the stability of the solution of the problem on the structural mathematical model, the scattering EMF is further taken into account as the EMF of one of the transformer windings. Such simplification will practically not affect the accuracy of calculations, since in real conditions its value is insignificant in comparison with the nominal load voltage. For playback, depending on i0 = f ( Ψ ), a functional converter with a methodical error (piecewise linear approximation) was used. The curve i0 = f ( Ψ ) corresponds to the magnetization curve taken instantaneously by the sequential winding. Valve characteristics are considered perfect. In the closed state, the characteristics of the controlled valves are modeled according to the proposed circuit principle, by inputting to the input of the structural unit of the second equation of the system (2) voltage - Ub (i), respectively, the voltage on the controlled valves. To assess the degree of non-sinusoidality, an analysis of the harmonic composition of the scheme mode parameters was performed. For effective regulation throughout the range, the schemes in which. eliminates the possibility of long-term operation of the transformer without demagnetizing circuit. These are, for example, circuits with inductive switches or with three-winding BT. Key words: booster transformer, thyristor control, magnetic system