Analysis and modelling of cyclic loading power transformer

Thye, Hun Shen (2010) Analysis and modelling of cyclic loading power transformer. Masters thesis, Universiti Malaysia Sarawak, (UNIMAS).

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Abstract

Transformers can transfer the required electricity to the residential, commercial and industrial are~ to fulfil the consumption demand. This study targets to determine the permitted overloading conditions and to maximize the electricity supply without reducing the lifespan of the transformer by setting the necessary transformer parameters. This study concludes that the loading curve pattern and power usage are very much dependent on the distribution network in each substation. The permitted overloading conditions for Planned Load Beyond Nameplate (PLBN), Long-Time Emergency Load (LTE) and Short-Time Emergency load (STE) are estimated. The parameters of the transformer, i.e. loss of life, permitted overloading conditions and maximum load capacity were examined in this study. The evaluated results reveal that the transformer's loss of life correlates to the capacity loading curve pattern, power factor and ambient temperature. Besides, the transformer's loss of life is highly dependent on the capacity loading curve pattern. Other information, namely loading curve pattern, power factor and factory test acceptance (F AT) reports are referred as well. Results reveal that the loss of life for each transformer is approximately 0.0 % over 30 years of lifespan. The results imply that the lifespan of every transformer in the substations can last for over 30 years.

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