Vibration Protection Model of Pumped-storage Unit Based on Inverse-time Method

doi:10.3901/JME.2020.18.188

Abstract

Abstract: Stability parameter monitoring and vibration protection system plays important role in safe and stable running of pumped storage power units. For the constraints of some factors from working head, active power, etc. trip logic of vibration protection system becomes complicated more and more. Therefore, the protection system usually can not accurately trip the unit on the unit abnormality and failure. In order to solve the above problem, a new solution that considering the material fatigue life is proposed with introducing inverse-time method from electrical engineering to vibration protection system.The inverse-time method is presented briefly; Vibration peak-to-peak value characteristics of typical unstable working points of pumped storage power unit are studied. On the basis of vibration characteristics, the setting method and procedures of vibration inverse-time protection is proposed. The effectiveness of inverse-time method for the unit vibration is verified by a detailed case. The research indicates that by avoiding the maximum accumulated vibration and taking the reliability coefficient of 1.5-2.0, inverse-time vibration protection can be settled validly. Trip logic based on the inverse-time method is reliable and cost-effective. Problems, such as complicated logic, poor reliability from nowadays used in vibration protection, can be solved. Meanwhile, the method provided is of reference value for other rotating machinery.

Key words: pumped-storage power unit, unstable working conditions, vibration protection, inverse-time, peak-to-peak value, S-N curve

CLC Number:

TM312
TK730

ZHANG Fei, PAN Weifeng, JIANG Xianyu, SUN Erjun. Vibration Protection Model of Pumped-storage Unit Based on Inverse-time Method[J]. Journal of Mechanical Engineering, 2020, 56(18): 188-196.

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