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Pengaruh optimalisasi maintenance terhadap On Load Tap Changer Transformator Daya 50 MVA 150/20 kV Sulistyowati Sulistyowati; Slamet Nurhadi; Dhimas Dhesah Kharisma
JURNAL ELTEK Vol 20 No 2 (2022): ELTEK Vol 20 No 2
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.005 KB) | DOI: 10.33795/eltek.v20i2.358

Abstract

Penyediaan energi listrik dengan yang kontinuitas penyaluran energi yang terjamin, dan kualitas tegangan yang baik sesuai dengan kebutuhan dunia industri perlu diperhatikan. Pengaturan tegangan (regulator tegangan) mutlak perlu dilakukan karena pengaruh tegangan input dari PLN selaku penyedia energi listrik yang fluktuatif, dan pengaruh perubahan beban yang berubah-ubah pada sisi konsumen. Adanya faktor diatas, penyesesuaian tegangan dengan cara melakukan perpindahan tap perbandingan kumparan dengan peralatan OLTC (On Load Tap Changer). Meningkatkan kinerja operasional dari on load tap changer dengan mengoptimalkan lagi program perawatan dan perbaikan (maintenance) yang terjadwal. Dengan maintenance yang terjadwal, dan memperbaiki faktor-faktor yang berpengaruh secara langsung terhadap OLTC, diharapkan dapat memperkecil jumlah perpindahan on load tap changer transformator, sehingga didapatkan life time yang lebih lama dalam artian life time dari kontak OLTC sebesar 100.000 untuk preventive maintenance, dan 500.000 untuk overhoule maintenance dapat dilampaui dengan waktu yang lebih lama, tanpa mengangu kehandalan serta fungsi dari peralatan itu sendiri. It is necessary to pay attention to the supply of electrical energy with guaranteed continuity of energy distribution, and good voltage quality in accordance with the needs of the industrial world. Voltage regulation (voltage regulator) absolutely needs to be done because of the influence of the input voltage from PLN as a provider of fluctuating electrical energy, and the influence of changing load changes on the consumer side. The existence of the above factors, voltage adjustment by changing the coil comparison tap with OLTC (On Load Tap Changer) equipment. The method used is by analyzing changes in load patterns, fluctuations in input voltage, and overall maintenance of power transformers. In accordance with the estimated life time of the transformer OLTC, the obtained life time is around 80 months and 25 days (6 years, 6 months, 25 days). And after the 80 months and 25 days have passed, the transformer and the on load tap changer device should be thoroughly serviced. When compared with manual tap changer operations, it can save up to 4 times the displacement of the tap changer in 1 hour or about 34560 times the displacement of the tap in 1 year and an improvement of 57.14% is obtained
Pemasangan Instalasi Listrik Penerangan Untuk Masyarakat Binaan Disnaker di Pemkot Malang Sukamdi; Anang Dasa Novfowan; Mochammad Mieftah; Rachmat Sutjipto; Dhimas Dhesah Kharisma
Elposys: Jurnal Sistem Kelistrikan Vol. 7 No. 3 (2020): ELPOSYS vol.7 no.3 (2020)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (350.265 KB) | DOI: 10.33795/elposys.v7i3.667

Abstract

This study discusses the installation of lighting electrical installations that are appropriate and safe for the community assisted by the Manpower Office in Malang City Government. The existence of this research is expected to provide additional skills in installing lighting installations, to be used in working to install lighting installations that are correct and safe and in accordance with standards, so as to minimize work hazards or accidents due to errors due to installation and use. This research activity was carried out in the AK Building of Malang State Polytechnic, Jalan Soekarno Hatta Malang by Malang State Polytechnic. The research activity for lighting electrical installations was carried out using a direct practice method. These activities are the introduction of standard electrical installation equipment according to PUIL; Introduction of lighting equipment components such as lamps, switches, contact boxes; and Installation of fittings, contact boxes, pipes, cables, switches. From the results of the research which was carried out for several days, the results obtained were knowing the practical theory of lighting installation; know the use of PPE properly; know the components of the lighting installation; know the electric measuring instruments; knowing how to install lighting installation components correctly and safely; know what things are done before the object is connected to a power source; and can take measurements when the object has been connected to a power source.
Analisis Penggunaan Transformator Sisipan Untuk Mengatasi Rugi Tegangan dan Pembebanan Lebih Rachmat Sutjipto; Heri Sungkowo; Epiwardi; Dhimas Dhesah Kharisma
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 3 (2023): ELPOSYS vol. 10 no. 3 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v10i3.4223

Abstract

On the JD267 distribution transformer with a capacity of 100 kVA at the Kalibaru feeder on the PT PLN (Persero) ULP Genteng experienced overloading at WBP (88.03%) and high voltage losses. The magnitude of the load exceeds 80% of the standard transformer capacity and is in the bad category (load >= 80%) according to Table I. SE No. 0017.E/DIR/2014, related to transformer loading percentage. Meanwhile, the voltage loss of the JD267 transformer when the WBP is in Phase R is 19.05%, Phase S is 17.08%, and Phase T is 18.33%. This exceeds the voltage tolerance limit in SPLN 1:1995 that the voltage is not allowed to exceed +5% and -10% of the PLN standard voltage, namely 220 V. To handle this problem, PT. PLN (Persero) ULP Genteng carried out the installation of insert transformers by estimating load growth in the next 5 years using the Least Square method. After the addition of the insert transformer, the loading on the JD267 distribution transformer fell to 58.93% on WBP. Meanwhile, the magnitude of the JD267 transformer voltage loss when the WBP after insertion in the R Phase decreases to 0.84%, the S Phase is 1.04%, and the T Phase is 1.63%, and when the LWBP after insertion in the R Phase decreases to 0 .76%, S Phase 0.30%, and T Phase 0.6%. Based on the data above, adding an insert transformer can improve the loading percentage on the transformer and reduce voltage losses that occur at the end voltage of the transformer.