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MODELAREA DISPOZITIVELOR DE TIP TRANSFORMATOR TRIFAZAT CU MIEZ DIN TREI TIJE
PENTRU CALCULILE INGINEREŞTI A MODURILOR ASIMETRICE PENTRU DIFERITE SCHEME
DE CONEXIUNE A BOBINELOR Boşneaga V.A., Suslov V.M.
Institutul de Energetică al Academiei de Ştiinţe a Moldovei
Rezumat. Este propus modelul pentru efectuarea calculelor şi cercet rilor a modurilor permanente asimetrice şi proceselor tranzitorie a dispozitivului tip transformator trifazat cu miez din trei tije şi schema arbitrar de conexiune a bobinelor, ţinând cont de cuplarea electromagnetica dintre înf şur rile situate pe diferite tije. Folosind ca exemplu transformatorul de distribuţie 10/0,4 kV s-au efectuat calcule şi analiz a celor mai caracteristice moduri permanente asimetrice, care apar la scurtcircuite, rupturi de faze, sarcina dezechilibrat în diferite scheme de conectare a bobinelor şi, în special, asociate cu apariţia fluxului magnetic de secvenţ homopolar . Pentru regimurile şi schemele luate în consideraţie sunt construite diagrame vectoriale pentru curenţi şi tensiuni, precum şi pentru valorile relative ale fluxului magnetic în tije, care ofer o imagine gr itoare despre caracteristicile acestor regime.
Cuvinte-cheie: Model, moduri asimetrice, miez din trei tije, scheme arbitrare de conexiune a bobinelor, fluxul magnetic de secvenţ homopolar .
MODELING OF THREE-PHASE THREE LEG TRANSFORMER DEVICES FOR ENGINEERING CALCULATIONS OF ASYMMETRICAL MODES FOR DIFFERENT SCHEMES OF WINDING
CONNECTIONS Bosneaga V.A., Suslov V.M.
Power Engineering Institute of Moldova Academy of Sciences
Abstract. The model is proposed for the calculation and research of steady state asymmetric modes and transients in three-phase three legs transformer devices with arbitrary diagram of windings connection, taking into account the electromagnetic coupling of the windings, located on different legs. Using as an example distribution transformer of 10/0.4 kV calculations and analysis were performed of the most characteristic steady asymmetrical modes, that occur during short circuit, phase failure, unbalanced load for the most common windings connections and, in particular, associated with the occurrence of zero sequence magnetic flow. For the considered regimes and schemes vector diagrams were constructed for currents and voltages as well as for the relative values of magnetic flow, which give a clear idea about their particular features.
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