Efeitos de cargas não-lineares no dimensionamento de transformadores trifásicos de distribuição
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Data
2012-05-30
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Universidade Federal de Goiás
Resumo
The intense use of solid state converters that use semiconductor in processing
electric power of electrical and electronic equipment brings great benefits such as lower cost,
greater efficiency and comfort, but also brings disadvantages, because when connected to the
distribution system of electricity produced currents distorted relative to the sinusoidal
waveform.. Thus also cause nonsinusoidal voltages that produce additional losses in
conductors, transformers and also in its own equipment that generated them. In transformers
feeding nonlinear loads occur further losses, which increase the temperature and
compromising the insulation life. The factors used and internationally recommended in UL
1561-1994 (K-factor) and IEEE Std C57.110-2008 (Harmonic Loss Factor - FHL) to calculate
maximum power three-phase transformers operating in these conditions will be objects of
comparison. This work, performed in the laboratory with two three-phase transformers
connected in the configuration back-to-back, aims to conduct a survey of actual losses in
transformers under linear and nonlinear load and also propose a new scale factor that the
three-phase transformers feeding these specific charges. Another aspect to be addressed is
planning the design of transformers using these factors. The measurements and data
processing are performed at low voltages of the transformers and use transducers voltage and
current with high accuracy and LabVIEW programming.
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Citação
SANTOS, Cairo Rezende dos. Effects of non-linear in design of three-phase distribution transformers. 2012. 111 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Goiás, Goiânia, 2012.