Abstract—The structural integrity of generator retaining ring at Dieng geothermal power plant has been evaluated using analytical and finite element method base on the scenario of the over speed at 100%, 120% and 150% of rated speed. To validate the evaluation, penetrant testing is applied with the retaining ring remains patches to its rotor. Base on the evaluation results of both methods, safety factor against yielding is greater than 1.0. Then based on the penetrant testing, it was not detected the presence of defects on the retaining ring generator surface. However from the displacement result which obtained by finite element, the displacement in third case has the same value as the interference therefore there is a possibility of retaining ring movement from its position that can lead to fretting failure.
Index Terms—Generator retaining ring, structural integrity, finite elements, safety factor.
Hilman Syaeful Alam and Demi Soetraprawata are with the Technical Implementation Unit for Instrumentation Development, Indonesian Institute of Sciences, Jl, Sangkuriang Komp, LIPI Gd. 30, Bandung, 40135, Indonesia (e-mail: hilm003@lipi.go.id, demistp@gmail.com).
Imam Djunaedi is with Research Center of Physics, Indonesian Institute of Sciences, Jl, Sangkuriang Komp, LIPI Gd. 80, Bandung, 40135, Indonesia (e-mail: imam_djunaedi@yahoo.com).
Aditya Sukma Nugraha is with the Research Center for Power and Mechatronics, Indonesian Institute of Sciences, Jl, Sangkuriang Komp, LIPI Gd. 20, Bandung, 40135, Indonesia (e-mail: aditngrh@gmail.com).
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Cite:Hilman Syaeful Alam, Imam Djunaedi, Aditya Sukma Nugraha, and Demi Soetraprawata, "Structural Integrity Evaluation of Generator Retaining Ring at Dieng Geothermal Power Plant," Journal of Clean Energy Technologies vol. 3, no. 6, pp. 457-462, 2015.
