Results 111 to 120 of about 437 (152)
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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
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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
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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
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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
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Step response of a governed hydrogenerator
Proceedings of the Institution of Electrical Engineers, 1978Stable control of the frequency in an electrical power system is essential to ensure continuity of supply. It is determined by the combined effect of the speed governors fitted to the generating sets throughout the system. The power output response of a steam-driven set to sudden loss in generating capacity is initially fast, but, after a few seconds ...
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Report of dielectric tests on a large hydrogenerator
Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics, 1956THE OBJECT of the tests was to gather information regarding the characteristics of the insulation of a large generator winding. The tests also provided an opportunity to evaluate new test equipment and test methods. In particular, it was desired to evalute certain factors which may influence the results of various dielectric tests.
C. A. Duke, C. W. Ross, J. S. Johnson
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Global sensitivity analysis applied to an hydrogenerator
2016 IEEE Conference on Electromagnetic Field Computation (CEFC), 2016In this communication, a methodology based on a stochastic approach is proposed in order to characterize the effect of imperfections on the dimensions of a rotating electrical machine on on the time evolution of the signal of magnetic flux sensors. The methodology is based on an approximation of sparse polynomial chaos basis and Sobol indices to carry ...
Thu Trang Nguyen +3 more
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Parameters and losses of hydrogenerator damping systems
Proceedings of the Institution of Electrical Engineers, 1978The paper shows the necessity for: more exact methods to calculate and measure the parameters and damping system losses of highly utilised hydrogenerators; a more exact method for measuring the damping rod currents, by means of Hall's generators, and for the design of a current measurer and the measuring circuit, and a new method to calculate losses in
E. Chiricozzi, R. Hagopian, A. Nazarian
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2004
U studiji se mogu se prepoznati dva karakteristična dijela, studijski i istraživački. U studijskom dijelu, koji obuhvaća 2. i 3. poglavlje, najprije se daje pregled stanja i razvoja monitoringa hidroagregata, što je temeljeno na dostupnoj literaturi te na iskustvima svjetskih i domaćih tvrtki iz tog područja.
Rajković, Borivoje +6 more
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U studiji se mogu se prepoznati dva karakteristična dijela, studijski i istraživački. U studijskom dijelu, koji obuhvaća 2. i 3. poglavlje, najprije se daje pregled stanja i razvoja monitoringa hidroagregata, što je temeljeno na dostupnoj literaturi te na iskustvima svjetskih i domaćih tvrtki iz tog područja.
Rajković, Borivoje +6 more
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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 ...
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