Analysis of the Effect of Harmonic Distortion on the Performance of a 1600 Kva Distribution Transformer in an Industrial Electrical System Using Matlab/Simulink
DOI:
https://doi.org/10.35718/ismatech.v4i2.8482342Keywords:
Harmonic distortion, 1600 kVA transformer, THD-I, Matlab/SIMULINK, Power QualityAbstract
Distribution transformers are important components in industrial electrical systems because their performance is affected by power quality conditions, particularly harmonic distortion generated by nonlinear loads. This study aims to analyze the effect of harmonic distortion on the performance of a 1600 kVA distribution transformer and to compare field measurement results with simulation results using MATLAB and Simulink. Real measurements were conducted by using a Hioki PQ3198 and PQ One program on the distribution panel of the transformer. Measurement results showed THD-I values of 6.53% for phase R, 7.58% for phase S, and 7.50% for phase T, with an average apparent power of 307.1 kVA. MATLAB analysis was carried out with the variation of THD-I in the range of 0% to 20% to assess the effect on the RMS current, loading, and the copper loss index. However, Simulink analysis was performed using the nonlinear load, specifically a six-pulse diode rectifier. RMS current calculations based on fundamental current and THD yielded 462.282 A, 439.658 A, and 454.373 A for phases R, S, and T, respectively; meanwhile, the rectifier model produced a THD-I of 12.7159%, with the 5th harmonic (H5) component at 51.6665 and the 7th harmonic (H7) at 19.5684. These findings show that an increase in THD-I increases the effective current from a mathematical perspective, while a six-pulse rectifier gives rise to more distortion compared to the average case studied in practice.
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