Design and Acceptance Test of 23kV Stator Bars for the Largest Air Cooled Hydro Generator in Xiang Jia Ba Right Bank

摘要

For Xiang Jia Ba hydro power plant, the biggest aircooled hydro generator with an output of 890 MVA will be installed. The machine, within the scope of supply for ALSTOM at Right Bank, is designed with a 23 kV stator winding which finally allows an optimized electrical design of the entire machine considering the project specific speed and output. This paper will introduce the design, the manufacturing and the acceptance test of the aircooled 23kV stator bars. The complete acceptance tests of the bars show that the insulation system has good properties on thermal-electric aging, breakdown capability, dielectric losses and corona protection. This is a quite valuable reference to design stator winding at higher voltage level for in large machine up to 1000MW for example.