Results 81 to 90 of about 142 (118)
Some of the next articles are maybe not open access.
Hydrogenerator insulation maintenance practices
1983 EIC 6th Electrical/Electronical Insulation Conference, 1983Reliable generation requires a comprehensive preventive maintenance program to locate defects and arrest deterioration on electrical generating equipment. This paper outlines one utility's preventive maintenance and investigative practices on hydro-generator insulation systems and describes experience on some of the major repairs and overhauls.
G. G. McCrae, G. Dang
openaire +1 more source
New Design of Hydrogenerator Poles.
RE&PQJ, 2023HydrogeneratorThe excess of reactive power generated by power transmission lines is the reason for impermissible increase of voltage at the terminals of the length power transmission lines for consumers. One of the alternative decisions for this problem could become at the hydropower station hydrogenerators, specially designed or reconstructed for ...
openaire +1 more source
Output Error Identification of Hydrogenerator Conduit Dynamics
IEEE Power Engineering Review, 1989Two output error model reference adaptive identifiers are considered for estimating the parameters in a reduced-order gate position to pressure model for the hydrogenerator. Gradient and sensitivity function identifiers are discussed for hydroelectric applications, and connections are made between their structural differences and relative performance ...
M.A. Vogt, L. Wozniak, T.R. Whittemore
openaire +1 more source
Mechanical behavior of hydrogenerator endwindings
IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 2003This paper presents experimental investigations on hydrogenerator endwinding vibrations and temperatures. In steady-state operation, links between machine load, winding mechanical characteristics, and temperature are discussed. Viscoelastic properties of coil composite sections are proved.
A. Jarosz +4 more
openaire +1 more source
Proceedings of the 12th IEEE Mediterranean Electrotechnical Conference (IEEE Cat. No.04CH37521), 2004
The extended testing of hydrogenerator (rated 35 MVA) was made because the generators working age expired and it was going to be replaced with new one. This was the perfect opportunity to do some specific and not usual testing. The complicated testing plan was designed in order to enable recording as much relevant data as possible (electrical ...
Z. Zebic, Z. Maljkovic, M. Pavlica
openaire +1 more source
The extended testing of hydrogenerator (rated 35 MVA) was made because the generators working age expired and it was going to be replaced with new one. This was the perfect opportunity to do some specific and not usual testing. The complicated testing plan was designed in order to enable recording as much relevant data as possible (electrical ...
Z. Zebic, Z. Maljkovic, M. Pavlica
openaire +1 more source
Dynamics of Large Hydrogenerators
1996Based 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 +2 more
openaire +1 more source
Thermographic evaluation of hydrogenerator losses
SPIE Proceedings, 2012The 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 +1 more
openaire +1 more source
Controlling variable load stand-alone hydrogenerators
31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005., 2005The 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 +4 more
openaire +1 more source
Hydrogenerators refurbishment within Romanian power system
2011 IEEE 3rd International Symposium on Exploitation of Renewable Energy Sources (EXPRES), 2011The power quality is one of the main interests within the power generation, delivery and transmission domains. In order to have a higher quality for the power produced in synchronous generators (mainly located in hydro power plants), using an adequate excitation system is essential.
Flaviu Mihai Frigura-Iliasa +4 more
openaire +1 more source
Upgrading of hydrogenerator excitation systems
2000 Canadian Conference on Electrical and Computer Engineering. Conference Proceedings. Navigating to a New Era (Cat. No.00TH8492), 2002Whereas hydroelectric stations are continuing to deliver low-cost energy, in some cases after 75 years' service, certain peripherals of the generation units become obsolete after thirty years. Excitation systems in particular have required partial or total replacement, to provide: more stringent voltage regulation, enhanced stability of the sytems ...
openaire +1 more source