| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系碩士班 === 89 === The paper presents using Elgar 5250A harmonic voltage generator and ADX3000 power quality recorder to investigate the effect of various harmonic voltage wafeform on the operation performance, core loss and iron loss of single and three phase transformer. In this experiment, the voltage harmonic orders from 2 to 7, the voltage harmonic distortion factors (VDF) are 15% and 20%, respectively, were chosen, and according to different phase angle, each harmonic order was designed into 8 kinds of waveforms which phase angles are 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°. The experimental data includes core loss, iron loss, the two sides voltage, input current and efficiency.
From the experiment result, it can be found that the operation performance of single-transformer varies by not only different voltage harmonic orders and VDF but also phase angles of each individual harmonic. We can also be found that the operation performance of three-transformer varies by not only different voltage harmonic orders, VDF and phase angles of each individual harmonic,but also the three phase connection, such as Y-Y, Y-△, △-Y, △-△, V-V. These elements change will affect transformer’s electronic and physical characteristic. The effect of harmonic is hardly known by traditional analysis on the operation performance of transformer. Therefore, the paper uses back-propagation neural network to find the suitable parameters by learning, and can simulate the harmonic problems correctly on the operation of single and three-phase transformer.
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