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Vol. 161, Issue 12, December 2013, pp. 296-303




Repair Analysis for Low Head Hydraulic Generator Cracking and Rupture
1, 2 Zhenggui Li, 1 Fengyu Yang, 3 Guolei Si, 2 Dehong Wang

1 Institute of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

2 Gansu Chaijiaxia Hydropower Station, Lanzhou, 730065, China

3 Research and Development Center, Fenghuo Machinery Factory, Chengdu, 611130, China

 1 Tel: 13919090195, fax: 0931-7215688-2312
E-mail: lzhgui@126.com


Received: 18 September 2013   /Accepted: 22 November 2013   /Published: 30 December 2013

Digital Sensors and Sensor Sysstems


Abstract: The generator vibration of the unit is sensitive to the running conditions for the low-head turbine group's low head, high flow characteristics. The generator local stress concentration often leads to fatigue rupture of the metal structure, which will also affect its reliability. It easily leads the generator bracket of oblique arm structure to cracking and rupture. The reason of the cracking and rupture is proved by numerical analysis and its repair plan has been identified. On-site repair process should be strictly controlled, to ensure the greatest degree of welding quality and the elimination of welding stresses. Running for some time after repair, the main parameters, such as air-gap and other unit operation, have been analyzed. The results are satisfying, and confirm that the analysis of the generator bracket crack repair is objective and reasonable.


Keywords: Low head, Hydraulic power sets, The generator cracking and rupture, Numerical analysis, Repair.


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