Diagnostics of construction parts of the dry transformers

In the article is description of the contactless and contact analysis of dry power transformers 800 kVA with epoxy insulation by acoustic camera and frequency impedance analyzer. Both methods are most often used for the analysis of components (mainly windings) of power transformers. Power transformers create acoustic and noise emissions, which can be used to analyze the transformer during operation. The paper presents an analysis of the solid collocation of the noise and acoustic spectrum. Experimental measurements and analysis have shown that noise and acoustic analysis can be a suitable measurement for the diagnosis of distribution dry-type transformers.