Results 51 to 60 of about 1,644 (207)

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, Edgardo R. Castro-Pacheco, MSc., José Daniel Hernández-Vásquez, Rui Pitanga Marques da Silva   +3 more
doaj   +1 more source

Fault Detection and Diagnosis Based on Unsupervised Machine Learning Methods: A Kaplan Turbine Case Study

Energies, 2021
From the breakdown of the Kaplan rotor of a hydrogenerator unit and the monitored data collected during its operation before such a failure, this work presents a post-occurrence data analysis in which a previously developed hybrid method based on ...
Miguel A. C. Michalski, Arthur H. A. Melani, Renan F. da Silva, Gilberto F. M. de Souza, Fernando H. Hamaji   +4 more
doaj   +1 more source

Equipment for Predictive Maintenance in Hydrogenerators

AASRI Procedia, 2014
This paper presents an equipment for predictive maintenance in large hydrogenerators. This equipment uses techniques of digital signal processing of the information contained in the electrical variables involved in the operation of the generator. Basically, the current and voltage signals of the generator are monitored and applied the techniques of ...
Ribeiro, L.C., Bonaldi, E.L., de Oliveira, L.E.L., Silva, L.E. Borges da, Salomon, C.P., Santana, W.C., Silva, J.G. Borges da, Lambert-Torres, G.   +7 more
openaire   +1 more source

An efficient tabu search algorithm for robust solutions of electromagnetic design problems [PDF]

, 2014
2007-2008 > Academic research: refereed > Publication in refereed journalVersion of ...
Cheng, KWE, Ho, SL, Ni, G, Yang, S
core   +1 more source

Testing device with opened hydrostatic circuit for dynamic loading of the tractor engine by power take off shaft

Research in Agricultural Engineering, 2005
The developed loading device with opened hydrostatic circuit for measurement of speed and dynamic characteristics of the tractor engine by power take off is presented. This loading device may also be used as a portable type for field measurement.
Š. Drabant, M. Bolla, A. Žikla, I. Petranský, J. Ďuďák   +4 more
doaj   +1 more source

Deep Convolutional Variational Autoencoder as a 2D-Visualization Tool for Partial Discharge Source Classification in Hydrogenerators

IEEE Access, 2020
Hydrogenerators are strategic assets for power utilities. Their reliability and availability can lead to significant benefits. For decades, monitoring and diagnosis of hydrogenerators have been at the core of maintenance strategies. A significant part of
Ryad Zemouri, Melanie Levesque, Normand Amyot, Claude Hudon, Olivier Kokoko, Souheil Antoine Tahan   +5 more
doaj   +1 more source

An emigration genetic algorithm and its application to multiobjective optimal designs of electromagnetic devices [PDF]

, 2014
Author name used in this publication: S. L.
Ho, SL, Liu, ZJ, Ni, G, Wang, Y, Yang, S
core   +1 more source

The detection and localization of stator bar with electrical breakdown of insulation [PDF]

Zbornik Radova: Elektrotehnički Institut "Nikola Tesla", 2018
While in operation, the generators are exposed to various electrical, thermal, mechanical and chemical stresses, but also to pollutants that shorten their lifetime.
Klasnić Ilija, Nikolić Ljubiša, Ćirić Zoran   +2 more
doaj  

New method for experimental modal analysis of hydrogenerator's stator core using the excitation from the Poles

The Journal of Engineering, 2019
The study of stator core vibrations generated by electromagnetic forces in electrical machines is of great practical and theoretical interest. An important part of the problem is the correct determination of mode shapes and eigen frequencies of the ...
Allan de Barros, Alexandre D'Agostini, Thierre Zulzke Penteado, Norio Kato, André Alves Cunha, Egidio José Faria, Carlos Haluska, Fernando Hiroyuki Hamaji, Silvio Ikuyo Nabeta, Ivan Eduardo Chabu   +9 more
doaj   +1 more source

Commissioning tests of the first hydro-generator of the Bajo de Mina HPP (Panama) [PDF]

E3S Web of Conferences, 2020
A mathematical model has been developed for calculating the distribution of azimuthal velocities and the shape of the free surface of oil in the compartments of an oil bath of a hydro-generator. The mathematical model of oil flow is verified by comparing
Zuikov Andrey
doaj   +1 more source