The research report has 29 pages. It was prepared for the company ABB s.r.o.. Preparation and measurement of delivered samples is described. The structure of the cover Voltage Transformers (VT) was observed by the stereomicroscope ZEISS STEMI-2000 and the inverted light microscope ZEISS AXIO OBSERVER Z1m. The structure analysis of surface and element analysis was performed on a scanning electron microscope ZEISS EVO LS10 with an energy dispersive analyzer OXFORD X-Max 80 mm2. For the crystalline phase identification was performed a X-Ray Diffractometer EMPYREAN. The microhardness was measured using a LECO microhardness tester AMH43.

Description in English
The research report has 29 pages. It was prepared for the company ABB s.r.o.. Preparation and measurement of delivered samples is described. The structure of the cover Voltage Transformers (VT) was observed by the stereomicroscope ZEISS STEMI-2000 and the inverted light microscope ZEISS AXIO OBSERVER Z1m. The structure analysis of surface and element analysis was performed on a scanning electron microscope ZEISS EVO LS10 with an energy dispersive analyzer OXFORD X-Max 80 mm2. For the crystalline phase identification was performed a X-Ray Diffractometer EMPYREAN. The microhardness was measured using a LECO microhardness tester AMH43.

Keywords
Voltage Transformers, LM, SEM, EDS, HV.

Key words in English
Voltage Transformers, LM, SEM, EDS, HV.