Results 21 to 30 of about 437 (152)
Detection of shorted turns on rotor poles in hydrogenerators using artificial neural networks [PDF]
Zbornik Radova: Elektrotehnički Institut "Nikola Tesla", 2014 Early diagnosis of faults that might occur in industrial processes makes it possible to perform important preventative actions and therefore avoid the heavy economic losses involved in production stoppages and the replacement of elements and parts.
Babić Blagoje +4 more
doaj +1 more source
IET Electric Power Applications, Volume 15, Issue 11, Page 1529-1546, November 2021., 2021 Abstract In this study, the rotor loss as well as the temperature variations due to the static air‐gap eccentricity (SAGE) and the rotor inter‐turn short circuit (RISC) in synchronous generators is presented. Different from the previous studies, this study investigates the loss/temperature changes under not only the single SAGE fault and the single ...
Yu‐Ling He +8 more
wiley +1 more source
Synchronous machine performance under geomagnetic disturbances
High Voltage, Volume 6, Issue 5, Page 894-903, October 2021., 2021 Abstract Geomagnetic disturbances (GMDs) are known to disturb power system equipment performance. The danger is associated with geomagnetically induced currents (GICs) occurring at the Earth's surface during GMD. GICs do not endanger power system operation conditions by themselves.
Ilja Boguslawsky +3 more
wiley +1 more source
Shock and Vibration, Volume 2021, Issue 1, 2021., 2021 In this paper, the contact characteristics of the carbon brush/slip ring of the hydrogenerator under the eccentric vibration of the rotor are studied. The influence of spring parameters on the contact loss of the carbon brush/slip ring was studied by establishing the motion model of the carbon brush/slip ring for theoretical calculation and fitting the
Xinze Zhao +5 more
wiley +1 more source
The Energy Transition's Impact on the Accumulated Average Efficiency of Large Hydrogenerators [PDF]
, 2022 The energy transition is aimed to take advantage of the operational flexibility of hydropower to extend the integration of intermittent renewable sources. Consequently, the hydrogenerators will have to operate in regimes far away from their designed best-
Nøland, Jonas Kristiansen +2 more
core +2 more sources
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
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
Alternative method for assessing the effectiveness of heat exchangers
Measurement: Sensors, 2021 This article discusses an automated system for monitoring the thermal effectiveness of hydrogenerator heat exchangers (water-air). The proposed calculation methodology eliminates the need to measure the outlet air temperature (the heat exchanger hot ...
Mauricio N. Frota, PhD +3 more
doaj +1 more source
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