-In this paper, various configurations of octagonal wound transformer core topology, which has previously proved advantages on conventional wound cores, are studied. Each configuration has different joint types and different placement of joint zones on the core. Magnetic flux distributions and power losses of each configuration are analyzed and compared. Comparisons are based on both 2D&3D finite element simulations and experimental studies. The results show that, joint types and their placements on the core cause local flux accumulations and dramatically affect power loss of the core.
Abstract-Conventional light sources are less efficient as compared to the light emitting diode and compact fluorescent lamps. Conventional incandescent filament lamps are resistive and therefore do not depend on power quality parameters. In the electric power system, nonlinear loads are increasing rapidly and the high content of harmonic due to the nonlinear loads cannot be neglected. Harmonic generation from the light emitting diode and the compact fluorescent lamp is one of the main problems for power quality. In this study, the light efficiency and electrical characteristics of the light emitting diode lamps and compact fluorescent lamps are evaluated under various voltage harmonic levels. The results show that light emitting diode, produces more harmonics as compared to the compact fluorescent lamps, with the increase of the voltage harmonic distortion from 0.7% to 3.52% in the light emitting diode, current harmonic increased from 140% to 192%. The results also show that increase in voltage harmonic distortion just not only increase current harmonics distortion but also affect the light wavelength of the lamp.
Analysing the impact of charge station load on reliability indices Probabilistic modelling Analysis on real distribution network model Figure A. Estimated changes in SAIDI and SAIFI indices for the investigated years Purpose: Rapid increase in the number of electric vehicles and charging station loads challenges the adequacy and reliability of distribution networks. In order to plan and operate network properly, operators should have future projections includes electric vehicle charging station loads. Theory and Methods: Probabilistic modelling approach used in this study includes usage of the Probability Density Function (PDF) of Weibull distribution, Latin Hypercube Sampling (LHS) method, correlation between the loads and generation of optimum scenarios by applying reordering algorithm (ROA) in the context of suitable correlation between loads. Results: As a result of this study, it is seen that electric vehicle technology, which is expected to replace traditional fossil fuel-based vehicles, will become a major burden on distribution networks in particular in the near future, and may seriously increase operational risks. In this study, the effects of the electric vehicles and charging station loads on the reliability indices in the distribution network were assessed with probabilistic approach for upcoming years considering the loads of the electric vehicles and the charging station would increase rapidly in the world. Reliability. Conclusion: With the increase in the number of electric vehicles, it is seen that the calculated SAIDI and SAIFI values have increased and that the index value increased about 2.5 times in 20 years forward vision. This indicates that the planning work and future projections should not ignore electric vehicle loads.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.