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A structural index to affect the operation life of steam turbine generators
Author(s) -
Lin ChiHshiung
Publication year - 2008
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.474
Subject(s) - exciter , fault (geology) , steam turbine , turbine , vibration , control theory (sociology) , generator (circuit theory) , engineering , inertia , power (physics) , structural engineering , electrical engineering , computer science , physics , mechanical engineering , control (management) , acoustics , geology , classical mechanics , quantum mechanics , artificial intelligence , seismology
Abstract Since there is a largest occurrence probability among power line faults, the single‐phase‐to‐ground fault (1P‐G fault) plays a non‐negligible role on fatigue life of a turbine generator unit. It is found in this paper that the system frequency disturbance is the principal one to arouse torsional vibrations on turbine mechanism under a 1P‐G fault, which is different from the unidirectional one for a three‐phase‐to‐ground fault (3P‐G fault). By analyzing the turbine‐generator‐exciter‐blade model using the electromechanical analogy, it is further found that the structural index of K GEN‐TURB / H GEN ratio governs the response sensitivity to such a disturbance. That means the larger the ratio is, the severer the torsional vibrations induced will be. According to this result, it can be deduced that the coming generation of turbine generator units would get more sensitive to the 3P‐G fault because the tendency is toward reducing the inertia of generators. Copyright © 2008 John Wiley & Sons, Ltd.