This paper presents the main features of design, construction, performance analyses and experimental studies of a brushless self-excited three-phase synchronous generator. The basic construction, principle of operation, and exciting characteristics are described. In proposed machine the rotor winding is shorted through diodes and the self-excitation is reached by a slip between rotor and stator winding built with different pole numbers. Computer simulations performed with MATLAB® software were used to verify the mathematical model of the brushless self-excited synchronous generator and the achieved results showed similar behavior with experimental values.
This paper presents a contribution to the short-circuit analysis techniques study in Electric Power Distribution Systems. This analysis is focus on the three-phase line impedance variation and load level effects on fault currents in electric distribution systems. Thus, both the conductors arrangement on the feeder and load level are evaluated in this work through computer simulations performed in the MATLAB® environment. The numerical results were validated with the ATP software (Alternative Transient Program) and show that these factors produce significant variations in the faults current study on the power distribution networks.
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