1. The Analysis of a Generator Shaft Crack Cause by Torsional Vibration due to SSR
- Author
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Ying Guangyao, Li Weijun, Wang Zaihua, and Cai Wenfang
- Subjects
History ,Generator (computer programming) ,Torsional vibration ,Materials science ,business.industry ,Structural engineering ,business ,Computer Science Applications ,Education - Abstract
Abstract.This paper introduces the serious crack accident of the rotor of a 600 MW turbo-generator unit in Vietnam, which leads to the rotor scrapped. After excluding the material and design reasons, it is considered that the electrical torque is the possibility. Through the operation parameters and theoretical calculation of the unit, the fault reason is positioned as Sub-synchronous resonance. The most important criterion is that the vibration of Unit 1 increases simultaneously with that of Unit 2, which is physically isolated from Unit 1. Further theoretical calculation shows that the natural frequencies of torsional vibration are 13.74 Hz, 26.23 Hz and 30.30 Hz, which are complementary to the grid frequency at that time cause of the change of grid structure.
- Published
- 2021