Use of diagnostic system for analysis of mechanical condition of transformers winding

This paper is focused on the description of the suggested and realized diagnostic system for oil or dry distribution transformers 22/0.4 kV in test room for check of repair machines to 1 MVA. The introductory part of the paper describes the design solving of the diagnostic system from the point of view its control and measuring part for control, source and analysis of repaired high-voltage machines. In the next part, the description of the short-circuit measurement method using the source and measuring part and automated control using its software of the diagnostic system program is selected. In the last part of the paper is described how it is possible to increase the accuracy of short-circuit percentage impedance measurement thanks to a highly precision automated diagnostic system.