Aibeche, AbderrazakGrouni, S.Akroum, HamzaBoualegue, K.2018-02-062018-02-062013https://dspace.univ-boumerdes.dz/handle/123456789/4441This paper deals with experimental research of practical diagnostics measurement tests in industrial power transformers. In practical research we analyze the quality insulation diagnostic. The transformers system insulation is evaluated by using diagnostics of the dissipation factor in data industrial transformer (250 MVA, 15.75/220 kV) application. The insulation quality of power transformer is determined by multiple measurement tests of the insulation resistance winding, capacitance and dielectric dissipation factor. The measurement tests of dissipation factor given at the end of the production cycle not only assures that the quality of the transformer meets the specified levels but also provides insight into the subtleties of the manufacturing process. This paper gives an experimental research of measurement tests setup of dielectric dissipation factor that used GST and Guard mode techniques of earthling systems transformers insulationenDiagnosticPower TransformerInsulation ResistanceCapacitanceDissipation FactorArticle