Results 61 to 70 of about 437 (152)

3D eddy current and temperature field analysis of large hydro-generators in leading phase operations

CES Transactions on Electrical Machines and Systems, 2019
As a common practice, a large hydro-generator will operate in leading phase conditions to absorb the reactive power of the power grid. However, the accurate and precise prediction of the leading phase operation capacity of a large hydro-generator has ...
Ning Wang, Huifang Wang, Shiyou Yang
doaj   +1 more source

IDENTIFICATION OF TECHNOLOGICAL DEFECTS IN HIGH-VOLTAGE SOLID INSULATION OF ELECTRICAL INSULATION STRUCTURES ON THE CHARACTERISTICS OF PARTIAL DISCHARGES

Electrical engineering & Electromechanics, 2019
Introduction. High-voltage insulation systems always have some background level of the partial discharges, which does not have any significant effect on the life of the electrical insulation design.
G. V. Bezprozvannych, A. G. Kyessayev, I. A. Mirchuk, A. V. Roginskiy   +3 more
doaj   +1 more source

Analysis and Comparison of Sensors for Measurements of Partial Discharges in Hydrogenerator Stator Windings

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
In order to measure electrical signals produced by partial discharges in hydrogenerators stator windings, capacitive couplers are regularly used. They are electrically connected to the windings and therefore, require undesired insulation intrusion.
Victor Dmitriev, Rodrigo M. S. de Oliveira, Fernando S. Brasil, Paulo R. M. de Vilhena, Jonathas F. M. Modesto, Ronaldo F. Zampolo   +5 more
doaj   +1 more source

Application of magnetic wedges for stator slots of hydrogenerators

, 2020
SUMMARY The utilization of slot wedges made of magnetic material in a synchronous and induction motor or generator makes possibility to increase the efficiency of the machine.
J Polak, J Študir, Z Milojković, M Petrinić   +3 more
core  

Standstill Frequency Response Test and Validation of a Large Hydrogenerator [PDF]

, 2019
This paper intends to contribute to the revision process of the IEEE Standard 115 by demonstrating the applicability of the standstill frequency response (SSFR) test on large salient pole hydrogenerators.
Karaagac, Ulas, Kamwa, Innocent, Mahseredjian, Jean, Belqorchi, Abdelghafour   +3 more
core   +1 more source

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

Two-Phase Flow Characteristics of Evaporative Cooling System for Large-Capacity High-Speed Hydrogenerators' Rotor

CES Transactions on Electrical Machines and Systems
Research of evaporative cooling system for a rotor is of great significance for large-capacity, high-speed hydrogenerators. The two-phase flow characteristics are important parameters of the evaporative cooling system, and it is urgent to research the ...
Jiaqi Rao, Bin Xiong, Ruiwei Li
doaj   +1 more source

Advances in Modelling and Control of Wind and Hydrogenerators [PDF]

, 2020
Rapid deployment of wind and solar energy generation is going to result in a series of new problems with regards to the reliability of our electrical grid in terms of outages, cost, and life-time, forcing us to promptly deal with the challenging restructuring of our energy systems.
openaire   +2 more sources

Dimensionality Reduction and Clustering Strategies for Label Propagation in Partial Discharge Data Sets

Energies
Deep learning approaches have been successfully applied to perform automatic classification of phase-resolved partial discharge (PRPD) diagrams. Under the supervised learning paradigm, however, the performance of classifiers strongly depends on the ...
Ronaldo F. Zampolo, Frederico H. R. Lopes, Rodrigo M. S. de Oliveira, Martim F. Fernandes, Victor Dmitriev   +4 more
doaj   +1 more source

Effects of Al/NiCr Coatings on the Current-Carrying Tribological Performance of Hydrogenerator Collector Rings [PDF]

Cailiao Baohu
In order to improve the surface condition of collector rings in hydrogenerators and to enhance the current-carrying characteristics and operational stability of the brush/ring tribo-pair，Al and NiCr coatings were deposited on the surface of 45 steel，a ...
ZHAO Xinze, LI Wanting, LI Chenshi, ZHU Yunlong, LI Yang, ZHAO Meiyun, XU Xiang, YANG Wei
doaj   +1 more source