3D Electromagnetic-Temperature Field Close-Coupling Calculation of Losses and Heat in the Damper Winding of a Large Tubular Hydro-Generator
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To obtain more precise and rational calculation details of the loss and heat of a damper winding in a tubular hydro-generator, this study develops a three-dimensional, finite-element, electromagnetic-temperature field close-coupling model of the damper winding. On the basis of multi-physical field coupled theory, the model fully considers the temperature effects of the damper winding resistivities and heat conductivities, and the eddy current loss in the end region of the damper winding. The model was verified by direct tests of the damper winding temperature. Unlike the conventional weak-coupling model, the proposed close-coupling model fully captures the interaction between the electromagnetic and temperature fields. Therefore, of the model more accurately and reasonably calculates the loss and heat of the damper winding than the conventional model. The proposed calculation model can properly assess the loss and heat of damper windings in large hydro-generators, which is helpful for improving the design standards of hydro-generators.
Keywords3D electromagnetic-temperature field Close-coupling calculation Losses and heat Damper winding Tubular hydro-generator
This work was sponsored by the National Natural Science Youth Fund of China, nos. 51607146 and 61703345, the Key Scientific Research Fund from Xihua University, nos. Z1520907 and Z1520909, and the Key Research fund projects of the Sichuan Provincial Education Department, nos. 16ZA0155 and 16ZB0159. This work was also supported by the Sichuan Science and Technology Program, No. 2018GZ0391, 2017GZ0358, and 2017JY0204, the Sichuan Province Key Laboratory of Power Electronics Energy-saving Technologies & Equipment, no. szjj2016-048, a Grant from the Chunhui Project Foundation of the Education Department of China, no. Z2016144, and the International Cooperation Project of the Chengdu Science and Technology Bureau, no. 2016-GH02-00111-Hz. It was also sponsored by the Key Laboratory of Fluid and Power Machinery (Xihua University), Ministry of Education, China (no. SBZDPY-11-14).
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