Analisis Pembebanan Terhadap Perkiraan Umur Transformator Distribusi 20 kV Penyulang Lowokwaru di PT. PLN(PERSERO) UP3 Malang

One of the most important equipment components in the distribution of electrical energy is the distribution transformer.Distribution transformer if used continuously or continuously it can affect the performance of the transformer. The service life of thetransformer can be reduced more quickly if you do not pay attention to the factors that can make the transformer life shrinkage high. One ofthe causes of the reduced life of the transformer is due to loading. From the eleven transformers, it can be seen that there are differentloading variations, it is expected that the transformer life will remain at normal age. IEC 60354-1, 1991 stipulates the normal life of thetransformer is 20.55 years. The research method used is to perform calculations using the long-time method and 24-hour daily data bycalculating the loading at the time of LWBP and WBP on a 20 kV distribution transformer. Analysis of the calculation results revealed that thenormal condition of the transformer P1385 (68.66 %) winding temperature at LWBP 67.47°C and when WBP 69.45°C compared totransformer P0032 with overload conditions (120.91%) winding temperature when LWBP 60, 88°C and at WBP 119.51°C. From the data onthe lowest loading on the eleven transformers, namely transformer P0527 (41.69%) it is obtained that the estimated real aging age is 0.125and the estimated age of the P0527 transformer is >20 years. Compared to transformer P0032 (120.91%), the estimated real aging age is12,0003 p-u and the estimated age is less than 20 years or 9.5 years. Loading above 100% on the transformer based on the standard IEC60354-1, 1991 if it takes place continuously will cause heating of the transformer windings which can cause the shrinkage process in the lifeof the transformer to be faster.