Abstract
With the increasement of power load year by year, the number of distribution transformers is increasing. At the same time, the impact of harmonic disturbance on power system is also growing in recent years. In order to study the influence of harmonic current on hot-spot temperature of oil-immersed distribution transformer windings, the influence of uneven distribution of eddy current loss density on hot-spot temperature of windings is comprehensively analyzed based on the load loss calculation model under harmonic current established in previous studies. The results show that harmonic current can cause additional temperature rise of transformer. When the harmonic distortion rate is 40%, the hot-spot temperature rise of transformer reaches 102.7 K, far exceeding the limit of hot-spot temperature rise of 78 K. When the harmonic distortion rate is 60%, the temperature rise of the top oil exceeds its limit of 60 K. At this time, the temperature of the top oil reaches 112.2 °C, which is close to the flash point of mineral insulating oil, and has a great impact on the safe operation of the equipment.
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