Evaluation of a stator end winding bracing system to be used in large rotating machines

This paper deals with a possibility of application of new repairing procedure concerning stator end winding bracings in the large rotating machines - specifically changing of inter coil end winding bracings. For this purpose 3D glass fabric in several layers configuration was tested. It is a sandwich composite material consisted of two thin glass fabric layers, which are mutually interweaved with core in the shape of number 8. Complex tests were performed to verify application suitability of this new arrangement. Partial discharge measurements, dielectric dissipation factor and mechanical tests were done. Experimental results showed significant lack of uniformity of suggested material and limits of application of this arrangement.