Transformator distribusi 3 fasa berperan penting dalam penyaluran energi listrik kepada konsumen. Kerusakan belitan dapat memengaruhi kinerja transformator sehingga diperlukan proses rewinding dengan jumlah lilitan yang tepat. Penelitian ini bertujuan menganalisis rewinding belitan primer, hasil pengujian Transformer Turn Ratio (TTR) dan tahanan isolasi, serta menerapkan perhitungan lilitan berbasis web. Objek penelitian berupa transformator 160 kVA merek B&D dan Trafindo. Metode meliputi pengumpulan data nameplate, pengukuran TTR, perhitungan dua metode, rewinding, pengujian TTR dan Megger, serta implementasi web. Hasil menunjukkan B&D memiliki 22 lilitan sekunder dan 2.000 lilitan primer, sedangkan Trafindo memiliki 18 lilitan sekunder dan 1.636 lilitan primer. Perhitungan manual dan web menghasilkan nilai sama. Setelah rewinding, TTR B&D 90,985 dan Trafindo 90,990, dengan hasil masing-masing 2.001 dan 1.637 lilitan dalam batas toleransi. Hasil Megger B&D yaitu primer–sekunder 4.27 GΩ, primer–ground 15.6 GΩ, sekunder–ground 9.23 GΩ, primer–primer 0 GΩ, dan sekunder–sekunder 0 GΩ. Trafindo yaitu primer–sekunder 2.10 GΩ, primer–ground 2.15 GΩ, sekunder–ground 2.18 GΩ, primer–primer 0 GΩ, dan sekunder–sekunder 0 GΩ. Hasil penelitian menunjukkan proses rewinding, pengujian, dan perhitungan berbasis web mendukung rekondisi transformator.


Deskripsi Lain

Three-phase distribution transformers play an important role in supplying electrical energy to consumers. Winding damage can affect transformer performance, requiring a rewinding process with an accurate number of turns. This study aims to analyze the primary winding rewinding process, the results of the Transformer Turns Ratio (TTR) and insulation resistance tests, and the implementation of web-based winding calculations. The research objects were 160 kVA transformers manufactured by B&D and Trafindo. The methods included collecting nameplate data, measuring TTR, calculating winding turns using two methods, performing rewinding, conducting TTR and Megger tests, and implementing the calculations on a web-based system. The results showed that the B&D transformer had 22 secondary winding turns and 2,000 primary winding turns, while the Trafindo transformer had 18 secondary winding turns and 1,636 primary winding turns. The manual and web-based calculations produced the same results. After rewinding, the TTR values were 90.985 for B&D and 90.990 for Trafindo, with calculated winding turns of 2,001 and 1,637, respectively, which remained within the tolerance limits. The Megger test results for B&D were 4.27 GΩ between primary and secondary, 15.6 GΩ between primary and ground, 9.23 GΩ between secondary and ground, 0 GΩ between primary windings, and 0 GΩ between secondary windings. For Trafindo, the results were 2.10 GΩ, 2.15 GΩ, 2.18 GΩ, 0 GΩ, and 0 GΩ, respectively. The results indicate that rewinding, testing, and web-based calculations can support the reconditioning of three-phase distribution transformers.

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