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Power electronics-based equipment has become integral to the power generation, distribution, and utilization systems. Although the advancements in the field of power electronics provide several benefits and enable the implementation of cutting-edge solutions, the use of these devices introduces power quality issues which can adversely impact the utility system voltage and reduce the life expectancy of the distribution equipment due to excessive heating. This paper discusses the impact of harmonics produced by the line-to-neutral connected non-linear loads on the ratings of the dry-type distribution transformers. This paper demonstrates the application of IEEE C57.110 for transformer de-rating in conjunction with IEEE 57.96 for estimating the life expectancy of the transformers if the harmonic profile for a given load is known. Furthermore, this paper demonstrates the application of these standards to estimate the improvement in the transformer's loading capability and life expectancy through the installation of Active Harmonic Filter's (AHF) in the distribution systems.
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Hussain et al. (2024) studied this question.
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