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All Journal Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat ELPOSYS: Jurnal Sistem Kelistrikan Jurnal ELTEK Jurnal Pengabdian Kepada Masyarakat
Prasojo, Rahman Azis
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Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Social Sciences Other

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Pengembangan Uji Eksperimental Penuaan Dipercepat Sistem Isolasi Kertas Terendam Minyak Transformator Duanaputri, Rohmanita; Prasojo, Rahman Azis; Wiwaha, Sigit Setya; Akbar , Divac Nabiel; Handani, Galuh Prawestri Citra; Andrianto, Arif; Elyasa, Rizki Dias
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.v10i3.3070

Abstract

A transformer is a static electric device that is used to change the alternating voltage to a higher or lower level and is used to transfer energy from one electric circuit to another without changing the frequency. When the transformer is working, there is a temperature rise in the transformer which affects the degradation of the insulating paper and transformer oil. This accelerated aging tester applies the drying and vacuuming process as well as the arrangement of paper insulation racks to achieve maximum test results. The research method refers to IEC 60216-3 2006 for aging time, IEC TS 62332-1 2014 and IEC TS 62332-1 2011 as a reference for the Development of Accelerated Aging Experimental Test Cells for Transformer Oil-immersed Paper Insulation Systems. After achieving the existing goals, the addition of the drying process resulted in quite good Breakdown Voltage test results, not only that after the addition of vacuum it produced a good oil color according to ASTM D1500 as well as after the presence of paper placement racks the results of good tensile strength testing were proven by a graph which relatively decreased from sample 1 to sample 3.
Analisis Pengaruh Skala Warna dan UV-Vis Terhadap Tingkat Penuaan Isolasi Minyak Galuh Prawestri Citra Handani; Duanaputri, Rohmanita; Prasojo, Rahman Azis; Wiwaha, Sigit Setya; Akbar , Divac Nabiel; Hastari , Galih Pratiti Citra
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.v10i3.4445

Abstract

A transformer is a static device that can transfer electrical energy using the principle of electromagnetic induction. In operating conditions, the increase of temperature in the transformer will cause the oil insulation having disturbance, which will cause the quality of the insulation to decrease. In this research, oil isolation type shell diala b was chosen which was placed in an accelerated thermal aging chamber experiment device. Then shell diala b oil insulation is heated to a temperature of 120 °C and 160 °C with three sampling times. After this, the oil insulation characteristics were tested which includes oil color scale testing and UV-Visible spectrophotometric testing of the oil. The research method used refers to the IEC 60216-3 2006 standard for aging time and ASTM D-1500 COLOR SCALE for color scale testing. After testing the characteristics of shell diala b oil insulation, it was found that the value of the color scale had increased. Besides that, there has been an increase in the absorption of UV-Visible rays within the oil insulation, which causes the color of the insulation become darker as the temperature and the aging duration in the accelerated thermal aging chamber increases.
Perbandingan kinerja beberapa lampu LED cerdas Hakim, Muhammad Fahmi; Syamsiana, Ika Noer; Prasojo, Rahman Azis
JURNAL ELTEK Vol. 19 No. 2 (2021): Oktober 2021
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/eltek.v19i2.310

Abstract

Beberapa waktu terakhir terdapat sebuah teknlogi baru dari lampu LED, yaitu lampu LED cerdas. Sudah cukup banyak penelitian tentang perbandingan performa lampu LED dengan lampu jenis lainnya, namun belum ada penelitian tentang perbandingan kinerja antar merk lampu LED cerdas. Berdasarkan hal tersebut maka dilakukan analisis pengaruh warna cahaya dan tingkat kecerahan terhadap kuat penerangan lampu serta pengaruh tingkat kecerahan terhadap penggunaan energi, daya, faktor daya, tegangan, dan arus pada sembilan merek lampu dengan daya yang sama. Didapatkan hasil lampu Merek A mempunyai unjuk kerja yang lebih baik jika dibandingkan lampu merk lain. Hal ini dikarenakan lampu Merek A mempunyai nilai kuat penerangan yang paling baik di antara merk lampu lainnya pada kedua warna cahaya. Selain itu kuat penerangan lampu Merek A tidak terlalu terpengaruh dengan penurunan tingkat kecerahan. Namun, penggunaan energi listrik pada lampu merek A relatif konstan meskipun tingkat kecerahan diturunkan. ABSTRACT Recently, there has been a new technology for LED bulb, namely smart LED bulb. There have been many studies on comparing the performance of LED bulb with conventional bulb, but there has been no research on performance comparisons between brands of smart LED lamps. Based on this, an analysis of the effect of light color and brightness level on bulb illumination and the effect of brightness level on the use of energy, power, power factor, voltage, and current on nine brands of bulbs with the same power was carried out. The results obtained that A bulb have better performance when compared to other bulbs. This is because A bulbs have the best illumination value among other bulbs in both light colors. In addition, the illumination of the A bulb is not too affected by the decrease in the brightness level. However, the use of electrical energy in A bulb is relatively constant even though the brightness level is lowered.
Implementation of Insect Pest Control Innovation with Raindrop Sensor using Solar Energy Source in Shallots Farming Prasojo, Rahman Azis; Fahad, Waris Malik; Nadila, Dilavinsa Indar Putri; Duanaputri, Rohmanita; Hakim, Muhammad Fahmi; Sungkowo, Heri; Handani, Galuh Prawestri Citra
REKA ELKOMIKA: Jurnal Pengabdian kepada Masyarakat Vol 5, No 3 (2024): REKA ELKOMIKA
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaelkomika.v5i3.209-218

Abstract

Spodoptera exigua, commonly known as the beet armyworm, is a major pest affecting shallot (Allium ascalonicum L.) plants, leading to significant damage and economic losses for farmers. Traditional pest control methods, such as manual caterpillar removal and pesticide application, have proven ineffective and costly. In response, this study aims to develop an environmentally friendly and sustainable solution by designing a pest control system powered by solar energy, equipped with high-voltage wires, UV lamps, and a raindrop sensor for automatic operation. The system works by converting solar energy into electrical power, which then supplies the pest control unit. The UV lamps attract moths, while the high-voltage wire eliminates them. A raindrop sensor is used to ensure the system operates efficiently by shutting off during rainfall. The method involved discussions with local farmers, design and assembly of the device, followed by field implementation and monitoring in shallot farms. The results show that the device successfully trapped between 40 to 80 moths per day, significantly reducing pest populations and lowering production costs for farmers, as the use of chemical pesticides was minimized. Additionally, the quality of shallot crops improved, leading to higher market value. The solar-powered pest control system is an effective, eco-friendly alternative for managing pest infestations in shallot farming. It offers a cost-efficient solution, reducing the need for pesticides while improving crop quality and yield.
Transformer oil degradation detection system based on color scale analysis Hakim, Muhammad Fahmi; Prasojo, Rahman Azis; Duanaputri, Rohmanita; Wijaya, Bustani Hadi; Fidya Amaral, Hanifiyah Darna; Emzain, Zakki Fuadi
Indonesian Journal of Electrical Engineering and Computer Science Vol 37, No 1: January 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v37.i1.pp15-25

Abstract

The rise in power transformer load results in degradation of the condition of the transformer oil and ultimately a deficiency in the distribution of electrical energy. This degradation can be slowed down by reconditioning transformer oil based on oil color detection. This research aims to design, test and validate a transformer oil color testing system based on color sensor and microcontroller. To obtain an accurate system, tests were carried out on selecting the types of sensors, the color of the chamber walls, and the shapes of transformer oil sample vessel used. The oil color scale of the samples was determined visually according to the ASTMD1500, 2009 standard as a benchmark. The test results showed that the TCS3200 color sensor was able to detect the color of all transformer oil samples. White chamber wall and test tube as oil sample containers were chosen to increase system accuracy. Overall, the system is able to detect the color of transformer oil, convert to the ASTMD1500, 2009 standard transformer oil color scale, determine the condition of the transformer oil and conclude the level of transformer oil degradation according to CIGRE-761, 2019. Validation results showed the system had an accuracy level of 92.65%.
Fault diagnosis of power transformer using random forest based combined classifier Prasojo, Rahman Azis; Sutjipto, Rachmat; Hanif, Muhammad Rafi; Dermawan, Chalvyn Rahmat; Kurniawan, Indra
Bulletin of Electrical Engineering and Informatics Vol 14, No 1: February 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i1.7471

Abstract

In the power system, transformers are crucial electrical equipment that require an insulator or dielectric material, such as paper immersed in insulating oil, to prevent electrical contact between components. The dissolved gas analysis (DGA) test is important for diagnosing and determining the maintenance recommendations for transformers. The duval triangle method (DTM) is commonly used to identify faults in transformers. The data used in this article are from DGA test of power transformers in East Java and Bali transmission main unit (UIT JBM). The DGA data were analyzed based on the IEEE C57.104-2019 standards, and by using the developed random forest (RF) classifier-based DTM for easier software implementation and better accuracy. The results of fault identification in 6 transformers case study showed a low-thermal fault (T1)300 °C in transformer 1, where methane gas increased, stray gassing (S) in transformer 5 due to escalating hydrogen gas production, overheating (O)≤250 °C indicated in transformers 2 and 6 due to rising ethane gas production. Transformers 3 and 4 were found in normal condition. This fault identification is done to enhance the accuracy of maintenance recommendation action based on DGA.
Pelatihan Bagi Siswa SMK Jurusan Teknik Listrik Dalam Menghadapi Lomba Kompetensi Siswa (LKS) Di Balai RW. 02 Desa Mulyoagung Kabupaten Malang Mieftah, Mochammad; Dhesah Kharisma, Dhimas; Prasojo, Rahman Azis; Epiwardi , Epiwardi; Novfowan, Anang Dasa; Sungkowo, Heri
Jurnal Pengabdian kepada Masyarakat Vol. 11 No. 2 (2024): JURNAL PENGABDIAN KEPADA MASYARAKAT 2024
Publisher : P3M Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/abdimas.v11i2.4567

Abstract

Setiap tahun, Pemerintah Kota/Kabupaten selalu menyelenggarakan Lomba Kompetensi Siswa (LKS) di bidang teknik listrik antar SMK (Sekolah Menengah Kejuruan) tingkat kota/kabupaten. Kenyataan di lapangan, proses menyerap ilmu dan berlatih dari sekolahan masih kurang maksimal karena terbatasnya waktu. Pelatihan atau pembekalan bagi siswa SMK jurusan teknik listrik, diharapkan dapat memberikan arahan dan kisi-kisi tentang Lomba Kompetensi Siswa (LKS) bidang teknik listrik agar para siswa lebih mantap, percaya diri dengan adanya skill tambahan yang di berikan. Selain itu, dampak dari pembekalan ini adalah agar siswa mendapatkan nilai maksimal dan bisa menjadi pemenang dari lomba LKS ini. Dari pelatihan atau pembekalan tersebut didapatkan hasil yang memuaskan, siswa dapat merakit dengan cepat, benar dan rapi. Siswa juga dapat menjelaskan secara detail apa yang dikerjakan dan bahkan bisa menyelesaikan trouble shooting yang diberikan dengan sempurna.
Co-Authors Akbar , Divac Nabiel Amaral, Hanifiyah Darna Fidya Andrianto, Arif Dermawan, Chalvyn Rahmat Dhesah Kharisma, Dhimas Elyasa, Rizki Dias Epiwardi , Epiwardi Fahad, Waris Malik Galuh Prawestri Citra Handani Hakim, Muhammad Fahmi Handani, Galuh Prawestri Citra Hanif, Muhammad Rafi Hastari , Galih Pratiti Citra Indra Kurniawan Mieftah, Mochammad Nadila, Dilavinsa Indar Putri Novfowan, Anang Dasa Rohmanita Duanaputri Sungkowo, Heri Sutjipto, Rachmat Syamsiana, Ika Noer Wijaya, Bustani Hadi Wiwaha, Sigit Setya Zakki Fuadi Emzain