Experimental Comparison of Preferential vs. Common Delta Connections for the Star-Delta Starting of Induction Motors
José Augusto Itajiba,
Cézar Armando Cunha Varnier,
Sergio Henrique Lopes Cabral,
Stéfano Frizzo Stefenon,
Valderi Reis Quietinho Leithardt,
Raúl García Ovejero,
Ademir Nied,
Kin-Choong Yow
Affiliations
José Augusto Itajiba
Electrical Engineering Graduate Program, Electrical Engineering Department, Regional University of Blumenau, R. São Paulo 3250 (Itoupava Seca), Blumenau 89030-000, Brazil
Cézar Armando Cunha Varnier
WEG Industries, R. Venâncio da Silva Pôrto 399 (Nova Brasília), Jaraguá do Sul 89252-230, Brazil
Sergio Henrique Lopes Cabral
Electrical Engineering Graduate Program, Electrical Engineering Department, Regional University of Blumenau, R. São Paulo 3250 (Itoupava Seca), Blumenau 89030-000, Brazil
Stéfano Frizzo Stefenon
Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil
Valderi Reis Quietinho Leithardt
VALORIZA, Research Center for Endogenous Resources Valorization, Instituto Politécnico de Portalegre, 7300-555 Portalegre, Portugal
Raúl García Ovejero
Expert Systems and Applications Lab., E.T.S.I.I of Béjar, University of Salamanca, 37008 Salamanca, Spain
Ademir Nied
Electrical Engineering Graduate Program, Electrical Engineering Department, Santa Catarina State University (UDESC), R. Paulo Malschitzki 200 (North Industrial Zone), Joinville 89219-710, Brazil
Kin-Choong Yow
Software Systems Engineering Department, Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada
Although this is a fact that is not very explored in the literature, there are two possible forms to connect the stator winding of an induction motor in the delta. The choice for one of these forms defines the amplitude of the stator transient current during the switching from star to delta connection when the motor is driven by a star-delta starting system, which is the most widely used and diffused method for starting an induction motor. One of the possible forms of the delta connection gives rise to a switching current with a relatively small amplitude, which gives it the denomination of preferential. The other form has a relatively higher amplitude of switching current, but it is the most recommended and indicated in diagrams of catalogues and motor plates. Therefore, it is here called “common”. With the aim of evidencing how the differences between these two forms of delta connection are manifested, this paper approaches the issue experimentally, through a methodology with statistical support, for a better characterization of the performance of each of these forms of delta connection, in the case of the widely popular star-delta starting method.
