|Conţinutul numărului revistei|
| SM ISO690:2012|
BOŞNEAGA, Valeriu; SUSLOV, Victor. Investigation of asymetric modes of three-phase three legs phase shifting transformer with connection in delta and two additional windings. In: Problemele Energeticii Regionale. 2014, nr. 2(25), pp. 1-7. ISSN 1857-0070.
|Problemele Energeticii Regionale|
|Numărul 2(25) / 2014 / ISSN 1857-0070|
The model of power three-phase three legs phase-shifting transformer with
connection in delta and two additional windings is realized. Calculations and research of
steady state asymmetric modes particularities of given transformer with such windings
connection were fulfilled, taking into account the electromagnetic coupling of the windings,
located on different legs. Calculations and analysis were made using as an example the
distribution transformer with 10 kV high voltages, including the most characteristic steady
state asymmetric modes that occur during different short circuits and asymmetric no load
modes, associated with the occurrence of zero sequence magnetic flux. For the considered
modes vector diagrams for currents and voltages, as well as for the relative values of magnetic
fluxes in legs were constructed, which in ensemble give clear idea about their particularities.
Power three-phase three legs phase-shifting transformer model, asymmetric modes, three legs magnetic circuit, connection in delta with two additional windings, zerosequence magnetic flux