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JEET, Vol. 13, No. 6, November 2018
Analysis and Correction of Through-bolt End-region Overheating and Breakdown Failure in a Large Tubular Hydro-generator
Zhen-nan Fan
Area B - Electric Machinery and Power Electronics
Abstract A field-circuit coupling model of a typical faulty generator is established to correct through-bolt end-region overheating and breakdown failure in a tubular hydro-generator. Using the model, eddy current loss and electromagnetic forces on through bolts under normal and failure conditions are analyzed and compared and the natural frequency of a through bolt is determined. Based on the analysis results, the causative mechanism of failure is revealed and targeted improvement design measures are proposed. The numerical results are found to be consistent with the actual fault characteristics, validating the design measure improvements. The results are useful in improving the design and manufacturing standards and enhancing the operational reliability of large tubular hydrogenerators.
Keyword Failure analysis,Hydroelectric generators,Eddy currents,Electromagnetic forces.
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