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Muhammad Fahmi Hakim
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ELPOSYS: Jurnal Sistem Kelistrikan
Published by Politeknik Negeri Malang
ISSN : 2407232X     EISSN : 24072338     DOI : https://doi.org/10.33795
Core Subject : Science, Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering
ELPOSYS adalah jurnal nasional yang menyediakan sumber informasi ilmiah bagi peneliti dan akademisi, lembaga penelitian, lembaga pemerintah, dan industri. Kami menerbitkan research papers, review articles, dan case studies yang berfokus pada bidang ketenagalistrikan serta topik yang terkait. Semua makalah di-review oleh setidaknya dua reviewer. ELPOSYS diterbitkan oleh UPT – P2M Politeknik Negeri Malang dan diterbitkan tiga kali setiap tahun, yaitu Bulan Februari, Juni, dan Oktober. Artikel yang dipublikasikan bidang ilmunya sesuai atau relevan dengan topik-topik Jurnal ELPOSYS yang meliputi bidang (namun tidak terbatas pada): - Pembangkit, - Distribusi dan Transmisi Daya, -Konversi Daya, - Sistem Proteksi, - Transformator, - Teknologi Instalasi Listrik, - Kualitas Daya, - Aplikasi Teknologi Informasi pada Sistem Daya, - Aplikasi Kontrol Cerdas pada Sistem Daya, - Teknologi Pembangkitan berbasis Energi Terbarukan, - Mesin-mesin Listrik, - Pemodelan dan Simulasi Sistem Daya, - Elektronika Daya, - Pengukuran Besaran Listrik, - Kestabilan Sistem Daya, - Topik lain yang terkait.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 190 Documents
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Implementasi Thermoelectric Generator Lilin Sebagai Solusi Energi Tepat Guna Daerah Terpencil Kalimantan isdhianto, Irfan; Himawan, Helmy Mukti; Setiawan , Dona
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 3 (2025): ELPOSYS VOL. 12 NO.3 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i3.7780

Abstract

The demand for electricity in remote areas of Kalimantan remains a significant challenge due to the limited reach of the national power grid. This research aims to develop a low cost, eco friendly, and practical power generation solution using a thermoelectric generator (TEG) integrated with a candle based heat source. A prototype candle tube was designed and constructed using copper heat exchangers, TEG modules, and passive cooling systems (heatsinks). The system was tested under two conditions using one and two candles as heat sources while powering LED lights. Temperature data on the hot and cold sides of the TEG were recorded using an Arduino data logger, and the electrical output (voltage and current) was monitored using a USB multimeter. Results showed that increasing the number of candles significantly raised the temperature difference across the TEG, from 24°C with one candle to 39°C with two, leading to a voltage increase from 2.68 V to 2.80 V, current from 0.06 A  to 0.16 A, and power output from 0.15 W to 0.44 W. These findings demonstrate that the system's performance correlates directly with the thermal gradient. With its simple design, accessible materials, and passive operation, this candle based TEG system offers a promising alternative energy source for rural communities lacking access to conventional electricity, especially in Kalimantan’s interior regions.
Optimasi Perencanaan Pembangkit Listrik Tenaga Surya Atap On-Grid Melalui Simulasi PVsyst Slamet Nurhadi; Priya Surya Harijanto; Mochamad Ferdy Hamzah
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 3 (2025): ELPOSYS VOL. 12 NO.3 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i3.8676

Abstract

This study addressed the critical issue of Indonesia's persistent dependence on fossil fuels and the urgent need to accelerate New and Renewable Energy (NRE) adoption. The purpose of the research was to develop a comprehensive technical plan for a 1.202 kWp grid-tied rooftop photovoltaic (PV) system at a manufacturing facility in Karawang. The methodology employed a systematic approach consisting of site surveys, electrical configuration design (stringing, cabling, and protection systems compliant with PUIL 2020), and verification through PVsyst simulation software. Important findings revealed that the designed system projected an annual energy yield of 1,624,801 kWh with a Performance Ratio (PR) of 76.1%. The implications of this research suggested that the proposed rooftop PV system is technically robust and provides significant economic and environmental benefits, including an estimated annual revenue of IDR 1.68 billion and a reduction of 1,348.58 tons of CO2 emissions. These results demonstrated that large-scale industrial rooftop PV systems are a viable solution for achieving national energy transition goals
Klasifikasi Status Idle dan Kerja Wheel Loader WA350 Berbasis Akselerometer Tunggal Dhendy Zaki Ridwan; Branjangan, Panji Peksi; Winarko, Wigo Ardi
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 3 (2025): ELPOSYS VOL. 12 NO.3 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i3.8794

Abstract

Conventional hour meters on heavy equipment accumulate engine-ON time without distinguishing productive working from non-productive idle, which can bias preventive maintenance scheduling. This study evaluates the feasibility of separating idle and working conditions of a Komatsu WA350 wheel loader using a single tri-axial accelerometer. Vibration data were recorded at 700, 900, 1100, and 1300 rpm under two scenarios: engine-on with bucket stationary (idle) and engine-on with bucket actuation without load (working). The main indicator is the time-domain Root Mean Square (RMS) on AccX, AccY, and AccZ to represent vibration energy per axis, supported by low-frequency spectral inspection for interpretation. For paired comparison, the analysis focuses on 700–1100 rpm because the 1300 rpm dataset does not include a verified idle counterpart. The results show that AccX provides the most consistent separation, where RMS in working increases by approximately 10–13% compared to idle at 700–1100 rpm, while AccY is less stable and AccZ changes are minimal. These findings support a simple RMS-based logic as a practical basis for smart hour-metering to better reflect operational workload and improve service notification timing. Limitations include controlled test conditions (no-load bucket cycles) and a single mounting location; broader validation under varied loads, terrains, and operators is required.
Performa Antena Directional dan Omnidirectional pada Sistem FPV Walksnail Avatar Peksi Branjangan, Panji; Ridwan, Dhendy Zaki
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 3 (2025): ELPOSYS VOL. 12 NO.3 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i3.8798

Abstract

Visual monitoring in heavy equipment operations was critical for reducing workplace accidents caused by operator blind spots. Conventional static cameras and sensors often failed to provide adequate coverage in dynamic environments, leading to limitations in situational awareness. This study aimed to evaluate the transmission performance of the Walksnail Avatar digital FPV system using directional and omnidirectional antennas for blind spot monitoring applications. An experimental method was employed by configuring a digital FPV transmitter and receiver at a fixed distance of 20 meters with a wooden obstacle placed along the transmission path. The receiver antenna orientation was rotated at 10-degree intervals to measure variations in data rate and latency. Two antenna configurations were tested: a 9.4 dBi directional patch antenna and a standard omnidirectional antenna. The results indicated that the directional patch antenna achieved a maximum data rate of 25 MBps at frontal orientations but experienced significant degradation at lateral angles, with latency increasing up to 100 ms. In contrast, the omnidirectional antenna demonstrated more uniform performance across all directions, maintaining data rates between 19–24 MBps and stable latency below 45 ms. These findings were consistent with antenna radiation theory regarding gain concentration and angular coverage.The study implied that omnidirectional antennas were more suitable for blind spot monitoring in heavy equipment operations due to their consistent coverage and low latency, while directional antennas were better applied for focused line-of-sight monitoring scenarios. The results provided empirical guidance for selecting antenna configurations in digital FPV-based industrial safety systems.
Implementasi Kontrol Kecepatan Motor DC pada Sistem Pemotong Pita Otomatis menggunakan Mikrokontroler : Implementasi Kontrol Kecepatan Motor DC pada Sistem Pemotong Pita Otomatis menggunakan Mikrokontroler Imam Saukani; Agus Sukoco Heru Sumarno; Achmad Zaini; Prasetyo Hermawan
Elposys: Jurnal Sistem Kelistrikan Vol. 13 No. 1 (2026): ELPOSYS VOL. 13 NO.1 (2026)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v13i1.8818

Abstract

This study presents the design and implementation of an automatic ribbon cutting system aimed at enhancing precision and efficiency in small and medium enterprise (SME) production processes. The system employs an ESP32 microcontroller, a rotary encoder, and a DC motor governed by a proportional–integral–derivative (PID) control algorithm to maintain consistent cutting lengths. Experimental evaluations were conducted for setpoint lengths ranging from 50 to 100 cm at 5 cm intervals. PID parameters were systematically optimized, with a proportional gain of Kp = 0.03 achieving the lowest mean error of ±0.2 cm. Results indicate a substantial improvement in cutting accuracy compared to operations without PID control, with typical error tolerances ≤1 cm. This paper details the mechanical design, control system architecture, PID tuning methodology, and experimental performance analysis. The primary contribution lies in demonstrating the integration of PID control in an accessible and replicable ribbon cutting system suitable for SME applications.
Pengujian Kelayakan Penggantian Current Transformer Di Gardu Induk Rachmat Sutjipto; Putri Pebrianti; Harrij Mukti K; Rohmanita Duanaputri
Elposys: Jurnal Sistem Kelistrikan Vol. 13 No. 1 (2026): ELPOSYS VOL. 13 NO.1 (2026)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v13i1.8896

Abstract

At PT PLN (Persero) UIT JBM UPT Gardu Induk Ponorogo, an oil leakage problem was found in the 70 kV (1000/5A, 75VA) S-phase bay coupling CT caused by several factors including: cracks in the tank and damage to the gasket that has lost its elasticity due to age. From the above information, the purpose of this study is to assess the condition of the CT before and after replacement and provide recommendations based on applicable standards. To determine the new CT, the old CT specifications can be used as a reference so that it can improve the operational stability of the new CT both for the measurement process and for protection. From the results of the analysis before the replacement, it shows that the insulation resistance value in 2020 to 2022 has decreased by 52% and the results of the CT thermovision measurement show that the difference in conductor temperature and clamp temperature (Δ) is 36.03°C and does not meet the standards of PLN-SK/DIR/520/2014(0°C-10°C). After the replacement of CT (1000/5A, 40VA) showed an increase in insulation resistance from 67,000 MΩ (2022) to 152,000 MΩ (2023) and the measurement results with thermovision showed a change in ∆? from 36.03°C (2022) to 9.6°C (2023) so that it meets existing standards. These results indicate that CT replacement is a necessary action to maintain CT reliability in the electrical system at PT PLN (Persero) UIT JBM UPT Gardu Induk Ponorogo.
Implementasi Alat Pengujian Relay 48 dan 220 VAC Untuk Mendukung Pratikum di Bengkel Listrik 4 Arif Andrianto; Susilo; Agus Andryanto; Ilham Syarif Hidayatullah; Nanang Setio Pambudi; Saiful Andani
Elposys: Jurnal Sistem Kelistrikan Vol. 13 No. 1 (2026): ELPOSYS VOL. 13 NO.1 (2026)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v13i1.8920

Abstract

The Electrical Workshop 4 course at the State Polytechnic of Malang is a form of practicum that aims to improve students' competence in understanding and implementing electrical systems, including the use of relays as regulatory components in automatic control systems. One of the obstacles often encountered is a relay that is damaged or does not function before being used in a student project, causing delays in the learning process and increasing the workload of lecturers in manual che cking. To overcome these problems, this study aims to design and realize a 48 VAC and 220 VAC relay testing tool that can be used as a practicum aid in Electrical Workshop 4. This tool is designed using a step-down transformer to reduce the voltage from 220 VAC to 48 VAC, and is equipped with 8-pin and 11-pin relay sockets for the on-delay and off-delay relay types. The push button is used as a trigger for relay activation, and the indicator light functions as a marker for the success of the relay. The assembly and testing process of the tool was carried out in the Electrical Workshop, and the implementation results showed that the tool was able to function properly according to plan and could be operated by students. In addition, this research also produced a user manual and a scientific article that has been submitted to the Elposys journal. 
Battery Charging Boost Converter Metode Constant Current-Constant Voltage Mesin Penggiling Kedelai Irianto; Ahmad Firyal Adila; Muhammad Alvin Nasrullah; Sutedjo; Renny Rakhmawati; Diah Septi Yanaratri
Elposys: Jurnal Sistem Kelistrikan Vol. 13 No. 1 (2026): ELPOSYS VOL. 13 NO.1 (2026)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v13i1.8984

Abstract

The increasing utilization of renewable energy, such as solar panels, drives the need for efficient and safe energy storage systems. One of the main challenges is achieving a stable battery charging process. The Constant Current–Constant Voltage (CC–CV) method is an effective solution because it maintains a constant current during the initial charging stage and keeps the voltage stable as it approaches full capacity.This study implements a charging system for a 24V 26Ah VRLA battery using a boost converter with PI control based on the CC–CV method. The system operates offline (cycle use), meaning the load is not connected during charging. The constant current stage is carried out at 3.75 A until the voltage reaches 28.8 V, after which the system switches to constant voltage mode with a fixed voltage of 28.8 V and a gradually decreasing current.PI control is applied to maintain system stability and prevent overcurrent and overvoltage. Testing shows that the system is capable of charging the battery from 60% State of Charge (SoC) to full capacity in 2 hours and 30 minutes with an efficiency of 82%–85%. The converter output voltage remains stable at 28.8 V, and the charging current adjusts according to the battery condition.After charging, the battery can be used to supply a soybean grinding machine for 20 minutes. The system is also equipped with a SoC monitoring feature to prevent overdischarge and extend battery life.
Rebalancing Beban Gardu Distribusi Guna Meminimalkan Susut Teknis ULP Taliwang Savira Rosa Ghozali; Rahman Arifuddin; Resi Dwi Jayanti Kartika
Elposys: Jurnal Sistem Kelistrikan Vol. 13 No. 1 (2026): ELPOSYS VOL. 13 NO.1 (2026)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v13i1.9193

Abstract

The quality of electrical power is a crucial factor in supporting community activities and stimulating sustainable economic growth in developing regions. In electric power distribution systems, one of the most frequently encountered technical problems is the high level of technical losses caused by neutral current arising from load imbalance among phases on distribution feeders and transformers. The Brang Rea Feeder is identified as having the highest proportion of unbalanced distribution transformers, reaching 37%. The observed ranges of unbalance percentage, neutral current, and technical losses are 21.06%–66.67%, 3.5 A–117.2 A, and 2.36 W–2651.02 W. In practice, efforts to reduce technical losses are commonly implemented through the installation of additional protection systems, which high investment costs. Therefore, this study focuses on the analysis of neutral current and technical losses on the Brang Rea Feeder through the application of the Distribution Transformer Load Management Method, which is considered a more economical and practical alternative. The operating conditions before and after the implementation of this method are validated using ETAP 19.0.1. The scope of this study is limited to the evaluation of load imbalance, neutral current, and technical losses.After implementation, the unbalance percentage was reduced to 0%–19.05%, producing neutral current and technical loss ranges of 0 A–81.10 A and 0 W–1269.36 W. This improvement resulted 32,233.41 kWh energy saved and an additional revenue of IDR 46,567,609.92. Consequently, the contribution of technical losses to total distribution losses without E-Min at PT PLN (Persero) ULP Taliwang was significantly reduced.
Pengaruh Kopel 20 kV Antar Trafo terhadap Proteksi dan Keandalan Distribusi Yudha Adhe Widodo; Resi Dwi Jayanti Kartika Sari; Rahman Arifuddin
Elposys: Jurnal Sistem Kelistrikan Vol. 13 No. 1 (2026): ELPOSYS VOL. 13 NO.1 (2026)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v13i1.9210

Abstract

Lumajang Substation operates three power transformers; however, to date, a 20 kV coupling system between Transformer 2 and Transformer 3 has not yet been implemented. The absence of this coupling potentially leads to transformer overloading, protection coordination mismatch, and reduced reliability of the power supply. This study aims to analyze the impact of implementing a 20 kV inter-transformer coupling on protection system performance and distribution reliability improvement, as indicated by changes in SAIDI, SAIFI, and CAIDI indices at Lumajang Substation. After the implementation of the 20 kV coupling between Transformer 2 and Transformer 3, the SAIDI index decreased from 5.93% to 2.636%, the SAIFI index declined from 137.97% to 72.30%, and the CAIDI index was reduced from 0.269% to 0.242%. Short-circuit current calculations and simulations show that the maximum fault current, represented by a three-phase fault, reaches 17.981 kA, while the minimum fault current, represented by a single-phase-to-ground fault, is 23.092 A. The results yield an OCR setting with an Ipickup of 0.625 A and a TMS of 0.1565 SI, as well as a GFR setting with an Ipickup of 0.1385 A and a TMS of 0.6092 SI. The fault clearing time of the OCR on the coupling is 0.4 seconds, while that of the GFR is 4 seconds. These values fall between the clearing times of the 20 kV incoming feeder and outgoing feeders, thereby satisfying protection coordination principles as verified through simulations using ETAP 19.0.1 software.

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