Abstract :

Distribution transformers play a vital role in the electrical infrastructure by converting high voltage from the primary voltage source to a voltage suitable for use by end consumers. The energizing process, which is connecting the distribution transformer to the power source, is a critical stage in the implementation and operation of the electrical network. However, a thorough understanding of the factors that affect the efficiency, safety, and reliability of energizing is needed to ensure optimal transformer performance. The transformer energizing process begins with the secondary side of the transformer being given a voltage of 220/380 V 3 phase 50 Hz as input and making the secondary polarity of the transformer primary. Then the primary side of the transformer changes to the secondary side which outputs a voltage of 20 kV 3 phase 50 Hz. During the energizing process, the current flowing on the input or source side was measured at ± 5 A for each phase, 16.83 A at neutral, and 0.06 A at ground. The results of this process successfully energized the 25 kVA distribution transformer to a step-up with a note of the loss for the induction process indicated by the current flowing on the input side under no-load conditions.

---

Keywords :

20 kV, 220/380 V, Cubicle, Energize, Performance, Transformer

---

References :

1. K. Koswara and I. A. Daryanto, Power Distribution Transformer Test Analysis 160 kVA – Voltage 20 kVA /400 V – 4.6a /231a, J. Simetrik, vol.8, no.2, pp. 139–144, 2018.
2. Gusti Pahiyanti and S. Sukmajati, Three Phase Transformer Testing, p. volume 6-Nomor 2, 2016.
3. Cvt, B. A. Y. Gt, D. Upaya, M. Peralatan, P. Di, and G. Muara, Capacitive Voltage Insulation Resistance Testing, vol.11, no.2, pp. 209-212, 2022.
4. V Bay, G. Sari, and D. I. Gardu, Isolation On Voltage Transformers, vol.13, no.1, pp. 22-25, 2024.
5. Kusuma, J. A. Prayogo, and S. Agung, Analysis of Periodic Maintenance of 800 kVA Distribution Transformer at Hospital X, Tangerang City, vol.15, no.1, pp. 45-48, 2023.
6. Almanda, Analysis of Tangent Delta Testing on 150/20 kV 60 MVA Transformer Bushings at the Old Karet Substation,” vol.5, no.2, pp. 97-102.
7. S. Wardoyo, A. S. Sinaga, E. Ohee, and I. Artikel, Analysis of Power Losses Due to Load Unbalance in Distribution Transformers, pp. 1-6, 2023.
8. R. Waro, Analysis of the Service Life of 800 and 1600 kVA Distribution Transformers at PDAM Ngagel Surabaya, vol.2, no.2, 2024.
9. T. Elektro et al., Analysis of Insertion Transformer Addition to Overcome Overload at Distribution Substation at PT. PLN (Persero) ULP Abepura, pp. 56–63, 2007.
10. Seminar, N. Nciet, and N. Conference, Proceedings of the NCIET National Seminar Vol.1 (2020) B141-B149 National Conference of Industry, Engineering and Technology 2020, Semarang, Indonesia, vol.1, pp. 141–149, 2020.
11. Azis, K. Bayu, A. Setya, and A. Herdiansyah, Performance Evaluation of Mineral Oil Immersed Kraft Paper Transformer Insulation System in Accelerated Thermal Aging Test Cell, vol.09, no.3, pp. 87–92, 2022.
12. Naibaho, T. Elektro, F. Teknik, U. Krisnadwipayana, and M. Transformator, Transformer Failure Analysis Based on DGA Test Results, pp. 98-106.
13. Keywords: Transformer, Transformer Oil, Testing, Breakdown Voltage., vol.13, no. November, pp. 19-28, 2016.
14. Zebua, E. Komalasari, and S. Alam, Monitoring Loss of Life Transformator Distribusi Menggunakan Internet of Things, vol.9, no.1, pp. 80-87, 2022.
15. Energi, Effect of Water Content on Breakdown Voltage, vol.10, no.2, pp. 129-136, 2018.
16. T. Elektro, Analysis of Insulating Oil Characteristics of 11 kVA Power Transformer Using DGA and Breakdown Voltage Methods at Pertamina RU-II Dumai Refinery Substation, 2018.
17. Vol et al., Power Transformer Insulation Resistance Quality Analysis, vol.XXIII, no.2, pp. 1-10, 2021.
18. Kva and D. I. Pltmg, No Title, vol.1, no.2, pp. 122–132, 2018.
19. Sistem and K. Di, No Title, vol.5, no.2, pp. 9-16, 2008.
20. Iii, G. Induk, and K. Tahun, Comparative Analysis of Insulation Resistance Test Results of Transformer III Substation Kebasen in 2017, 2019, and 2021, 2021.
21. No Title, 2018.
22. Ondrialdi and U. Situmeang, Analysis of Power Transformer Insulation Quality Testing at PT. Indah Kiat Pulp and Paper Perawang, vol.4, no.2, pp. 72-81, 2020.
23. Juni and U. Rahman, Energy and Electricity Scientific Journal Visual Distribution Transformer Load Monitoring System and SMS Gateway at PT PLN (Persero) Energy and Electricity: Scientific Journal, vol.13, no.1, pp. 67-74, 2021.
24. Irwanto and R. D. Prabustya, Power Transformer Analysis Based on Transformer Oil Testing on Ring Main Unit (RMU) PSK 151 at PT. PLN (Persero) UP3 Cikupa, J. INSTEK (Informatika Sains dan Teknologi), vol.5, no.2, p. 168, 2020, doi: 10.24252/instek.v5i2.16200.
25. G. Gifari, Routine and Special Testing Analysis on 5 MVA 20 kV/6.3 kV Distribution Transformer, pp. 323–333, 2021.
26. H. Indra, Yanolanda Suzantry Handayani, and I. Priyadi, Insulation Resistance Testing on 160 kVA Distribution Transformer at PT. PLN (Persero) UP3 Bengkulu, J. Amplif. J. Ilm. Bid. Tek. Elektro Dan Komput., vol.12, no.2, pp. 8-15, 2022, doi: 10.33369/jamplifier.v12i2.25274.
27. Teknik et al., Distribution Transformer Monitoring System, vol.15, no2, pp. 29-37, 2018.
28. Cut, O. Fco, A. Payakumbuh, and I. A. Fahrezi, MSI Transaction on Education Feasibility Study of Input-Output Protection of Distribution Transformers MSI Transaction on Education Fuse Cut Out (FCO) and NH Fuse Protection on PHB-TR of an Electric Power Distribution System Substation to Distribute Electric Voltage, vol.02, no.04, 2021.
29. P. Tondok et al., Perencanaan Transformator Distribusi 125 kVA, vol. 8, no.2, pp. 83-92, 2019.
30. D. Purifikasi and A. Triyanto, 2500 kVA Transformer Performance Analysis, vol.2, no.12, pp. 3283-3288, 2023.