Evaluasi Uprating Transformator Distribusi 20 KV pada Penyulang Kelinci di PT. PLN (Persero) ULP Rumbai

The need for electrical energy affects the loading of the transformer which can result in overloading of more than 80%. PLN Standard No. 50 of 1997 states that a transformer is said to be overloaded if the load is more than 80%. This research aims to determine the effect of loading on transformer efficiency and voltage drop on distribution transformers. For loading on transformers before uprating, the results were 92.143%. The voltage drop percentage value obtained for each phase R, S, T is 11.121%, voltage drop percentage on the R phase, 10.973% voltage drop percentage on the S phase, 10.167% voltage drop percentage on the T phase. Uprating was carried out on the transformer to reduce overloading. After the uprating was carried out, the loading results were 55.568 % , which was in accordance with the permitted loading standards. The voltage drop percentage value obtained for each phase R, S, T is 10.973%, voltage drop percentage on the R phase, 10.524 % voltage drop percentage on the S phase, 9.637 % voltage drop percentage on the T phase.