Results 21 to 30 of about 142 (118)
Efficiency Mapping and Weighted Average Efficiency for Large Hydrogenerators
IEEE Open Journal of Industry Applications, 2021 This paper presents the concept of efficiency mapping for large synchronous hydrogenerators, which are useful for evaluating hydropower generation performance vis-à-vis interconnected intermittent generation to machine efficiency-oriented design ...
Edson da Costa Bortoni +4 more
doaj +1 more source
Mathematical Problems in Engineering, Volume 2021, Issue 1, 2021., 2021 This paper proposed a new hybrid diagnosis method for the generator’s 3D static eccentricity faults which include the axial eccentricity, the radial eccentricity, and the mixed eccentricity composed of the former two. Firstly, adaptive local iterative filtering (ALIF) method was used to decompose the vibration signals of the generator under ...
Chao Zhang +7 more
wiley +1 more source
Structural component fatigue analysis of a hydrogenerator rotor
Dyna, 2020 This paper presents a fatigue life calculation for the pole, the rotor rim, and the rotor spoke of a 100 MW hydro-generator. Mechanical and electrical parameters during unit start, with the hydro-generator working at several power levels, and during a ...
Gonzalo Fernando Casanova Garcia +2 more
doaj +1 more source
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 Aiming at the problem that it is difficult to extract the characteristics of the draft tube pressure fluctuation signal under the background of strong noise, this study proposes a dual noise reduction method based on adaptive local iterative filtering (ALIF) and singular value decomposition (SVD).
Yan Ren +8 more
wiley +1 more source
NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, 2023 У статті розглянуті основні причини вібрації у підп’ятнику гідрогінератора-двигуна потужністю 320 МВт. Розглянуті основні типи внутрішніх та поверхневих дефектів, що виникають на робочій поверхні диску підп’ятника у процесі довготривалої експлуатації.
openaire +3 more sources
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 In the shaft axis monitoring of hydrogenerating unit condition monitoring and fault diagnosis, the shaft orbit is intuitive and comprehensively reflects the unit operation state, and different shaft orbits correspond to different fault types, which can accurately indicate a system vibration fault.
Xinfeng Ge +10 more
wiley +1 more source
Nonlinear Vibration Analysis of Rotor considering Cogging and Harmonic Effects
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 This paper aims to investigate nonlinear vibration characteristics of rotor system considering cogging and harmonic effects. Firstly, relative permeance with eccentric was established and then corrected by correction factor caused by the cogging effect.
Shanle Li +5 more
wiley +1 more source
Improved hydrogenerator field winding thermal monitoring
Thermal Science, 2023 A new monitoring method for determination of average hydrogenerator field winding temperature is introduced in order to increase the robustness of the temperature measurement system using the classic U-I method. The classic approach is prone to error due to brush voltage drop, especially when field voltage is low.
Ilija Klasnic +2 more
openaire +1 more source
Mathematical Problems in Engineering, Volume 2021, Issue 1, 2021., 2021 This paper investigates the effect of the field winding interturn short‐circuit (FWISC) position on the rotor vibration properties in turbo generators. Different from the previous studies which focused on the influence of the short‐circuit degree, this work pays much attention to the impact of the short‐circuit position on the rotor unbalanced magnetic
Xing-Hua Yuan +6 more
wiley +1 more source
Mathematical Problems in Engineering, Volume 2021, Issue 1, 2021., 2021 Aiming at the problem that the vibration signals of the hydrogenerator unit are nonlinear and nonstationary and it is difficult to extract the signal features due to strong background noise and complex electromagnetic interference, this paper proposes a dual noise reduction method based on intrinsic time‐scale decomposition (ITD) and permutation ...
Yan Ren +6 more
wiley +1 more source