Affiliation:
1. North China Electric Power University
Abstract
When short circuit faults happen near power plant or generator terminal, severe transient torque shock will act on the shaft system, which seriously affects the safe and stable operation of the unit. Using the increment transfer matrix method, the dynamic responses of torsional vibrations are calculated in this work. Combined with the complex Morlet wavelet and time-frequency contour map, the time-frequency domain characters of dynamic torque are analyzed. The analyzed results show that the torque value caused by three phase short circuit fault is largest. The order of torque value from high to low is two phase short circuit to ground, two phase interphase short circuit and single phase short circuit. The electric distance between short circuit point and generator is more short, and the torsional vibration is more serious.
Publisher
Trans Tech Publications, Ltd.
Reference5 articles.
1. He Chengbing, Xing Cheng and Shen Jian: An increment transfer matrix method for the torsional vibration response of steam turbo-generator shaft system. Applied Mechanics and Materials, vol. 34-35(2010), pp.1082-1087.
2. He Chengbing, Gu Yujiong and Xing Cheng: Coupled flexural and torsional vibrations analysis of turbine generator shaft systems caused by short circuit fault. Proceedings of the CSEE, vol. 30 (2010), pp.84-90.
3. Hsieh, SC., JH. Chen and AC. Lee: A modified transfer matrix method for the coupled vibration. Journal of Sound and Vibration, vol. 312(2008) , pp.563-571.
4. Yuh-TaySheen: On the study of applying Morlet wavelet to the Hilbert transform for the envelope detection of bearing vibrations. Mechanical Systems and Signal Processing, vol. 23 (2009), pp.1518-1527.
5. Jiang Dongxiang, Diao Jinhui, Zhao Gang: Study on methods of vibration fault diagnosis based on time-frequence contour map for turbine generator unit, Proceedings of the CSEE, vol. 25(2005), pp.146-151.
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献