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Vol.14, No.2, 2014, pp.121–124 |
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METHODOLOGY FOR REPAIRING DEFECTS ON INTERNAL SURFACES OF CRANKS OF GUIDE VANE APPARATUS IN HYDROELECTRIC GENERATING SET AT HYDROPOWER PLANT DJERDAP 1 Miodrag Arsić1, Meri Burzić2, Radovan Miladin Karić2, Brane Vistać1, Zoran Savić1 1)Institute for Materials Testing, Belgrade, Serbia, miodrag.arsic@institutims.rs 2)University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia |
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Abstract Vertical Kaplan turbines, made in Russia, are installed in 6 hydroelectric generating sets at ‘Djerdap 1’, with nominal power of 200 MW each. During the refurbishment of the hydroelectric generating set A4 at the hydropower plant Djerdap 1, experimental non-destructive tests on all of its components are performed in order to determine the state of the turbine as a whole. During the tests, the damage and cracks are detected on internal surfaces of guide vane cranks and sleeves, which occurred as a consequence of turbine shaft vibration. The results of experimental tests, as well as repair methodology for damaged internal surfaces of guide vane cranks are presented in this paper. Due to the structural solution used for the design of cranks and sleeves and their function during exploitation, it was necessary to define a large number of details, carefully reconsider them, and carry out all activities in order to enable the safe operation and continuous use of cranks. Keywords: hydro turbine, crank, sleeve, damages, repair methodology |
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