Results 131 to 140 of about 1,744 (183)

Study of Different Types of Ventilation and Cooling Systems of Bulb Hydrogenerators in a Three-Dimensional Setting

SAE International Journal of Materials & Manufacturing
The Object of research in the article is the ventilation and cooling system of bulb hydrogenerators. The Subject of study in the article is the design and efficiency of using the cooling system of various structural types for bulb hydro units.
Oleksii Tretiak, Mariia Arefieva, P. Makarov, Serhii Serhiienko, A. Zhukov, I. Shulga, Nataliia Penkovska, S. Kravchenko, Anton Kovryga   +8 more
semanticscholar   +1 more source

Dynamics of Large Hydrogenerators

1996
Based on experimental data, this paper shows that the mathematical models of large hydrogenerators, used to preview the dynamic behavior at the design phase or as a predictive maintenance tool at the operation phase, must include the effects of the stiffness and damping forces of the oil film in the guide bearings.
G. C. Brito, H. I. Weber, A. G. A. Fuerst   +2 more
openaire   +1 more source

Thermographic evaluation of hydrogenerator losses

SPIE Proceedings, 2012
The calorimetric method has for a long time been applied for losses measurement and energy conversion efficiency determination in electrical machines. The number of temperature sensors necessary for its successful application in the field constitutes in one of the major drawbacks of the method.
Edson da Costa Bortoni, Roberto Teixeira Siniscalchi   +1 more
openaire   +1 more source

Controlling variable load stand-alone hydrogenerators

31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005., 2005
The paper aims to establish a common way in controlling the electric energy quality in micro hydro plants. The considered situation deals with the stand alone synchronous and induction generators. The research investigates a power control scheme that would allow avoiding the mechanical control of the turbine.
C. Marinescu, L. Clotea, M. Cirstea, I. Serban, C. Ion   +4 more
openaire   +1 more source

Devising a method for calculating the structure of efficient cooling systems for thrust bearings and guide bearings in hydrogenerators

Eastern-European Journal of Enterprise Technologies
The object of this study is the thermal and hydraulic characteristics of the oil coolers in a thrust bearing and guide bearing cooling system of hydrogenerators.
Oleksii Tretiak, S. Kravchenko, O. Mykhailychenko, V. Nazarenko, Serhii Smyk, O. Vasyliev, Mariia Arefieva, Iryna Tretiak, Serhii Serhiienko, V. Selevko   +9 more
semanticscholar   +1 more source

Methods for Formation and Tunning of Group Prognostic Controller of Hydrogenerators Rotors' Rotational Frequency

2021 Ural-Siberian Smart Energy Conference (USSEC), 2021
The application of a large number of distributed generation plants, built on the basis of synchronous generators in electric energy system (EES), requires solving the problem of their centralized control, adjustment of local controllers and stabilization
Yu. N. Bulatov, A. Kryukov, K. Suslov
semanticscholar   +1 more source

Development of a Low-Cost Ozone Monitoring Module for Continuous Partial Discharge Detection in Hydrogenerators

IEEE Transactions on Instrumentation and Measurement
Partial discharge (PD) measurement is a well-established predictive maintenance tool for high-voltage rotating machines, allowing the condition of the insulation to be assessed not only during machine outages, but also continuously monitored during ...
Martim F. Fernandes, Ian P. Bordin, José Alexandre de França   +2 more
semanticscholar   +1 more source

Design and Simulation Analysis of Anti-Corona Structure at the end of the Stator Bar of Large Hydrogenerators

2021 IEEE International Conference on Electronic Technology, Communication and Information (ICETCI), 2021
This article fist introduces the characteristics of COMSOL Multiphysics simulation software developed by COMSOL company, and then performs simulation on the influencing factors of stator bar electric distribution applying COMSOL simulation platform ...
Peng Yuan, He Wang
semanticscholar   +1 more source

Non-Invasive Detection of Rotor Inter-Turn Short Circuit in Large Hydrogenerators by Using Stray Flux Measurement Combined With Convolutional Variational Autoencoder Analysis (CVAE)

IEEE transactions on industry applications
Salient Pole Synchronous Generators (SPSG) are known for their robustness and stability; However, internal faults like rotor interturn short circuits (ITSC) might still occur and lead to unscheduled machine shutdowns if not caught early.
H. Bechara, R. Zemouri, B. Kedjar, A. Merkhouf, K. Al-Haddad, Antoine Tahan   +5 more
semanticscholar   +1 more source

Structural optimization of pipeline of rotor inner evaporative cooling system for hydrogenerators

Journal of Physics: Conference Series
As hydroelectric generators evolve toward larger single-unit capacity and higher rotational speed, the difficulty of rotor heat dissipation is steadily growing, creating an urgent need for efficient cooling technologies tailored to match them.
Ruiwei Li, Sheng Zhao
semanticscholar   +1 more source