Open AccessThe Analysis of a Generator Shaft Crack Cause by Torsional Vibration due to SSR
Author(s) -
Wenfang Cai,
Ying Gao,
Weijun Li,
Zaihua Wang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2101/1/012022
Subject(s) - turbo generator , vibration , torsional vibration , rotor (electric) , generator (circuit theory) , torque , structural engineering , unit (ring theory) , fault (geology) , natural frequency , grid , engineering , acoustics , electrical engineering , physics , power (physics) , mathematics , geology , mathematics education , quantum mechanics , seismology , thermodynamics , geometry
.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.