Modeling the saturation processes of a power-transformer core under simultaneous direct and alternating current passing through the winding


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A mathematical model of a three-phase two-winding step-up power transformer with the winding circuit Δ/Yo with simultaneous ac and dc currents passed through the grounded winding has been developed. The proposed model is represented by a system of differential equations, which are nonlinear because of the nonlinearity of the inductive resistances of the magnetization curve. The calculation results for a TDTs-400000/242/20 shell–core transformer are given. The model takes into account the effect of dc on the saturation of the power-transformer core, which is especially important under asymmetrical modes that can occur during thunderstorms, seismic activities, or space-weather disturbances.

Sobre autores

V. Vakhnina

Togliatti State University

Autor responsável pela correspondência
Email: journal-elektrotechnika@mail.ru
Rússia, Togliatti, Samara oblast, 445020

V. Kuznetsov

Togliatti State University

Email: journal-elektrotechnika@mail.ru
Rússia, Togliatti, Samara oblast, 445020

V. Shapovalov

Togliatti State University

Email: journal-elektrotechnika@mail.ru
Rússia, Togliatti, Samara oblast, 445020

O. Samolina

Togliatti State University

Email: journal-elektrotechnika@mail.ru
Rússia, Togliatti, Samara oblast, 445020

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