Abstract
Harmonic currents generated by nonlinear loads can cause overheating and premature failure of power transformers. According to IEEE Std C57.110TM - 2008, Eddy Current losses are considered proportional to the harmonic current squared multiplied by the harmonic number. This paper will discuss 2 case studies, namely: a transformer without using a harmonic filter and a transformer using a harmonic filter. This research was conducted by measuring the amount of harmonics in arc furnace customers using power quality analysis equipment for 7 days. From the research results obtained indicate that the value of the k-factor is inversely proportional to the maximum transformer capability and is directly proportional to the decrease in transformer capability. So that the transformer that is installed using a harmonic filter has a k-factor value and derating capability is smaller than the transformer without using a harmonic filter, in order not to derating capability of the transformer without using a harmonic filter or a transformer that uses a harmonic filter, it is necessary to use the K-Factor Transformer K-4.
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