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Influence of double excitation AC/DC in the reactive power demand of 3-phase transformers
(IEEE, 1999-12-01)
In this work it is discussed the performance of the reactive power demand in three-leg transformer core and three-phase transformer bank, under different conditions of AC/DC double excitation. In order to analyse the ...
Instantaneous complex power applied to three-phase machines
(1993-12-01)
The theory presented in this paper was primarily developed to give a physical interpretation for the instantaneous power flow on a three-phase induction machine, without a neutral conductor, on any operational state and ...
On nonlinear dynamics in a free fluid surface of a tank excited by a non-ideal power source
(2011-12-01)
We investigate the nonlinear oscillations in a free surface of a fluid in a cylinder tank excited by non-ideal power source, an electric motor with limited power supply. We study the possibility of parametric resonance in ...
Experimental analysis of harmonic distortions in the excitation currents of double-excited three-phase transformers
(Institute of Electrical and Electronics Engineers (IEEE), 2000-01-01)
This paper shows the results of experimental investigations of three-phase banks composed of single-phase transformers and three-phase three-limb core transformers under simultaneous alternating and direct current excitations, ...
Non-ideal excitation approach for piezoelectric vibration based energy harvesting
(2014-01-01)
Common solution for energy harvester device is project design according harmonic excitation around natural frequency matching excitation source. Environment vibration is random and wide band causing short time of resonance ...
Evaluation of Volts/Hertz and over-excitation limiters acting under unbalanced load conditions.
(IEEEPiscataway, 2013)
Currently, a worldwide tendency of decentralization
of electric energy production (called Distributed Generation) is
observed, where small generators – sometimes composed by
synchronous machines – are connected mainly ...
Investigation of photoinduced electrical properties in the heterojunction TiO2/SnO2
(Trans Tech Publications Ltd, 2014-01-01)
TiO2/SnO2 thin films heterostructures were grown by the sol-gel dip-coating technique. It was found that the crystalline structure of TiO2 depends on the annealing temperature and the substrate type. TiO2 films deposited ...
Optical excitation of charge carriers from intra-bandgap states in Ce-doped SnO2 thin films
(2008-05-21)
Optical excitation of Ce3+-doped SnO2 thin films, obtained by the sol-gel-dip-coating technique, is carried out and the effects on electrical transport are evaluated. Samples are doped with O. lat% of Ce, just above the ...
Asymmetrical magnetization in three-phase core type transformers
(1995-12-01)
The performance of the three-phase core type transformers, under AC/DC double excitation is discussed in this work. It is presented a mathematical model that considers the mutual coupling between phases and the magnetic ...
On Nonlinear Dynamics and Control of A Particular Portal Frame Foundation Model, Excited by a Non-Ideal Motor
(2003-12-08)
The nonlinear dynamic response and a nonlinear control method of a particular portal frame foundation for an unbalanced rotating machine with limited power (non-ideal motor) are examined. Numerical simulations are performed ...