ELPOSYS: Jurnal Sistem Kelistrikan
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.
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<![CDATA[Implementasi Relai Low Impedance Pada Gardu Induk 150 kV Lengkong Lama ]]>
<![CDATA[Hermawan, Ahmad]]>;
<![CDATA[Harijanto, Priya Surya]]>;
<![CDATA[Wiguno, Fadhil]]>;
<![CDATA[Hermawan, Satria Luthfi]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.7234
<![CDATA[The substation played a vital role in the distribution of electrical power from the generator to end users, requiring a reliable protection system to ensure continuity and safety. At the 150 kV Lengkong Substation, the existing busbar protection system used an electromechanical high impedance relai, which lacked the sensitivity, selectivity, and reliability demanded by current operational standards. This research aimed to improve the reliability of the substation’s protection system by replacing the high impedance relai with a digital low impedance numerical relai (GE P746). The method involved direct field observation, data collection, and system testing, including individual relai tests, functional evaluations, and differential current calculations. Tap settings and wiring integration were adjusted to accommodate the new relai's configuration and performance standards issued by PT PLN (Persero) UIT JBB. The findings showed that the new relai functioned well in normal operation, block trip, and block all modes. The differential current (Idiff) calculations at Busbar 1 and Busbar 2 yielded 9.32 A and 28.25 A respectively—both well below the 80 A protection threshold, indicating system stability and correct operation. These results confirmed that the upgraded relai system operated within the safe zone and did not trigger false trips. This study highlighted the necessity of modernizing protection systems across substations and recommended further integration with digital communication protocols such as IEC 61850 to enhance future grid reliability and responsiveness.]]>
<![CDATA[Solar Tracking System Pada Panel Surya dengan Metode Optimum Tegangan Menggunakan Mikrokontroler ]]>
<![CDATA[Habsari, Kumala Mahda]]>;
<![CDATA[Arwin, Zawatan]]>;
<![CDATA[Ningrum, Hanifah Nur Kumala]]>;
<![CDATA[Prakoso, Dimas Nur]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.7269
<![CDATA[This study examines the application of a Solar Tracking System on photovoltaic panels using the Optimal Voltage Method controlled by an Arduino Mega 2560 microcontroller. The system is designed to dynamically optimize the panel's position to continuously face the sun, thereby increasing radiation absorption and improving electrical energy conversion efficiency. Testing was conducted by comparing the output voltage of the panel with and without the tracking system. The measurement results showed an average increase of 1.51% in the output voltage when the tracking system was activated. Analysis of solar irradiation data and light intensity further supports the system's effectiveness in maximizing solar energy utilization throughout the day. With the Arduino Mega 2560's ability to process data in real-time and control linear actuators, this system has proven to be effective in enhancing photovoltaic panel performance. This research is expected to lead to significant changes. The innovation made can improve solar energy efficiency, reduce costs, and expand global access to clean energy. Furthermore, this innovation contributes to achieving sustainability goals set by various countries, creating a positive impact on economic growth, job creation, and environmental health. With ongoing technological advancements, the solar tracking system has the potential to play a key role in realizing a more sustainable and environmentally friendly future in the energy sector.]]>
<![CDATA[Implementasi CUK Inverting Konverter Pada Battery Charging Terintegrasi Fotovoltaik Berbasis PID ]]>
<![CDATA[Amalia, Rahma Nur]]>;
<![CDATA[Syamsiana, Ika Noer]]>;
<![CDATA[Madani, Lingga Ahadian]]>;
<![CDATA[Widhi, Tri Warisaning]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.7286
<![CDATA[This study aims to test the performance of PWM, voltage sensors, ACS712 current sensors, and the efficiency of the inverting CUK converter in an energy conversion system. PWM testing showed a stable output frequency of 31.250 Hz across various duty cycles. Voltage sensor testing resulted in an average error of 1.2% for the solar panel sensor and 2.2% for the battery sensor, indicating good accuracy. ACS712 current sensor testing showed an average error of 1.5% at the solar panel input and 9.7% at the converter output to the battery. The inverting CUK converter achieved a maximum efficiency of 89% at a 14% duty cycle. These results indicate that the developed system has high accuracy and efficiency in power conversion. Paying attention to efficiency and accuracy will bring great benefits, such as cost efficiency, system stability, high energy quality. An important contribution of this research is to improve the efficiency and stability of renewable energy systems, especially those integrated with solar panels and batteries, and to support the development of more environmentally friendly and sustainable energy solutions.]]>
<![CDATA[Pemodelan Kurva Pembebanan Transformator Distribusi Berdasarkan Variasi Penetrasi PLTS Atap ]]>
<![CDATA[Galuh Prawestri Citra Handani]]>;
<![CDATA[Rahman Azis Prasojo]]>;
<![CDATA[Nurfi Fuad Al Azah]]>;
<![CDATA[Salman Alfarisi]]>;
<![CDATA[Anang Dasa Novfowan]]>;
<![CDATA[Afidah Zuroida]]>;
<![CDATA[Rahma Nur Amalia]]>;
<![CDATA[Rhezal Agung Ananto]]>;
<![CDATA[Arinalhaq Fatachul Aziiz]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.7326
<![CDATA[Transformers are considered important equipment in the power distribution system. Determining the state of the distribution network loading curve a network model to analyze the impact of the rooftop PV system penetration level. The assumption of penetration is 10% - 100% and based on the amount of transformer power according to the nameplate, which is 160 kVA. The transformer that used is GTT BB1215, which is one of the distribution transformers in the PT PLN (Persero) UP3 South Surabaya. The loading curve modeling uses DIgSILENT PowerFactory 2021 software with the Quasi-Dynamic Simulation feature. Based on the average loading curve of GTT BB1215 for 14 days, there is a fluctuation, starting at 00.00 a.m - 06.00 a.m the load will decrease, the load will increase again at 06.00 a.m – 07.00 p.m, and the peak load at 06.00 p.m - 07.00 p.m with a current of 140 A (96 kW) or 60% of the transformer capacity load. The lowest load occurs at 06.00 a.m with a current of 94 A (65 kW) or 40% of the transformer capacity load. At a penetration level of 10% - 40%, the transformer load decreases significantly. However, when the penetration level exceeds 40%, there is a reverse power flow from the rooftop PV system to the transformer. This condition make the current to continue flowing even though the load on the transformer has reached 0, because the current represents the power flow from the rooftop PV system to the network, not from the customer load.]]>
<![CDATA[Potensi dan Perbandingan Turbin Crossflow dengan Turbin Kaplan PLTMH Wisata Telaga ]]>
<![CDATA[Muhammad Syafiudin]]>;
<![CDATA[Resi Dwi Jayanti Kartika Sari]]>;
<![CDATA[Rahman Arifuddin]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.7221
<![CDATA[Microhydro power plants present a sustainable energy solution, especially for rural and remote areas like Telaga Jiwa in Sumber Porong Village, Malang. This study aims to evaluate the site's hydro energy potential and determine the most efficient turbine type between Kaplan and Crossflow for application in a small-scale MHP system. Field measurements of water discharge were conducted using the float-area method, while head elevation was obtained through Google Earth data combined with direct site verification. The analysis revealed an average discharge of 0.354 m³/s and an effective head of 9.35 meters, producing a theoretical power output of 24.13 kW. Based on performance analysis, the Kaplan turbine achieved an efficiency of 83%, slightly higher than the 80.5% efficiency of the Crossflow turbine, indicating Kaplan’s suitability for relatively stable flow and medium head conditions. The total system efficiency, accounting for turbine, generator, and transmission losses, reached 72%. This output is sufficient to provide electricity to approximately 86 households with an average daily consumption of 4.7 kWh. The study concludes that implementing an MHP at this location is technically feasible and can contribute significantly to rural electrification, reducing fossil fuel dependency, and supporting national energy resilience. The findings also offer a technical reference for future microhydro development in similar geographic and hydrological conditions.]]>
<![CDATA[Proteksi Arus Netral dan Suhu Transformator Berbasis IoT Dampak Beban Tidak Seimbang ]]>
<![CDATA[Pratama, Rafiif Ariesandi Rola]]>;
<![CDATA[Indhana Sudiharto]]>;
<![CDATA[Suhariningsih]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.6207
<![CDATA[Current imbalance results in neutral current and an increase in the temperature of the distribution transformer body. Due to the large number and scattered locations, maintenance of the transformers is carried out at least three times a year. Therefore, the authors developed a laboratory-scale device, which is a miniature neutral current and temperature increase protection system based on the Internet of Things (IoT). The results from the laboratory-scale testing of this protection system will disconnect the load when the current imbalance reaches ≥25% and the body temperature reaches ≥90˚C. Notifications will be sent to Telegram if the load current imbalance is in the range of 10%-14% (sufficient), 15%-24% (insufficient), and ≥25% (poor), and temperatures of 83-84℃ (sufficient), 85-89℃ (insufficient), and ≥90℃ (poor). The miniature protection can disconnect the load when the imbalance value is 25.92% and the temperature reaches 90˚C. Monitoring data is stored in a logger and can be downloaded. Thus, this tool can enhance reliability and help PLN personnel work more effectively.]]>
<![CDATA[Sistem Monitoring PLTS pada Miniatur PLTH berbasis Mikrokontroler ]]>
<![CDATA[Permana, Bharata Sena Indra]]>;
<![CDATA[Aji, Anicetus Damar]]>;
<![CDATA[Muchlishah]]>;
<![CDATA[Dezetty Monika]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.6230
<![CDATA[This study focused on the development of a monitoring system for a solar power plant within a miniature hybrid power system, utilizing the ESP32 microcontroller. The system was designed to enhance the efficiency and reliability of solar power monitoring by integrating sensors for light intensity, temperature, and humidity. Sensor data were analyzed and displayed in real time through the Blynk application, enabling practical remote monitoring via mobile devices. The results indicated a significant positive correlation between light intensity and temperature with the electrical power output. The system recorded a maximum voltage of 21,42 V, a maximum current of 1,95 A, and a peak power of 27,2 W from a 50 Wp solar panel measuring 40 cm × 62,5 cm × 2,5 cm, under peak light intensity and temperature conditions. Furthermore, the system effectively identified daily patterns in output power variability. In conclusion, the microcontroller-based monitoring system developed in this study offered an efficient and cost-effective solution for solar power plant management, significantly improving data acquisition and system performance monitoring. These findings contributed meaningfully to the advancement of more efficient and reliable photovoltaic (PV) technology.]]>
<![CDATA[Pemeliharaan Tahunan Pressure Transmitter Area Steam Generation Industri Petrokimia di PT. X ]]>
<![CDATA[Hafiz, Muhammad]]>;
<![CDATA[Novan Akhiriyanto]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.6424
<![CDATA[Monitoring steam generation systems in the petrochemical industry is essential because small pressure changes can significantly affect product quality and pose safety risks. This study focuses on calibrating the Endress+Hauser Cerabar M PMC41 pressure Transmitter at PT. X, a leading Indonesian fatty alcohol and oleochemical producer. Calibration was performed to ensure accurate pressure measurement of steam generation processes using a zero calibration technique to correct reading Errors. Measurement data were collected before and after calibration at 0%, 25%, 50%, and 100% pressure levels. The initial Error in pressure measurement was 31.799 bar (4.47%), while the current output Error was 16.76 mA (3.8%). After calibration, these Errors reduced to 30.266 bar (0.72%) and 16.023 mA (0.115%), respectively. These results indicate a significant improvement in the Transmitter’s performance, aligning with the International Electrotechnical Commission (IEC) No. 13B-23 standards. The calibration process effectively minimized measurement Errors, ensuring precise monitoring of pressure parameters in the steam generation system and maintaining operational stability. Accurate pressure control is crucial to optimizing production efficiency and maintaining safety standards at PT. X.]]>
<![CDATA[Desain Miniatur Plant Simulator Pompa Air Kotor Panel Kontrol Relai Kontaktor ]]>
<![CDATA[Susilo]]>;
<![CDATA[Nanang Setio Pambudhi]]>;
<![CDATA[Agus Andrianto]]>;
<![CDATA[Dimas Eriyanto]]>;
<![CDATA[Milzam Brillian Santanaa]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.6989
<![CDATA[Wastewater management played a crucial role in maintaining environmental cleanliness and health, where water pumps held a vital position. However, manually operated pump systems were often inefficient and posed potential health risks if failures occurred. This research aimed to design and create a miniature plant simulator for wastewater pumps utilizing a relay contactor control panel. This miniature plant was specifically designed to automatically simulate the operation of a wastewater pump system, offering a solution to replace the often inefficient manual methods. The research process commenced with identifying the main components required, such as a three-phase induction motor, contactors, thermal overload relays, and associated sensors. Subsequently, the design and construction of both the simulator and its control panel were meticulously carried out. Implementation involved comprehensive testing of each component's functionality and the overall system's integrity, including individual component testing and evaluation under simulated system failure conditions like overload and no flow. The research results clearly demonstrated that the built miniature plant simulator functioned effectively as expected. The automatic control system employing relay contactors proved efficient and safe in operating the water pump, capable of managing various water levels and detecting abnormal conditions such as overload and no flow. This miniature plant could serve not only as a valuable learning tool but also as a promising prototype for the development of larger and more complex wastewater pump control systems in the future.]]>
<![CDATA[Integrasi IoT pada Mesin Roasting Kopi Fluidized Bed ]]>
<![CDATA[Wijaya Kusuma]]>;
<![CDATA[Rahman Azis Prasojo]]>;
<![CDATA[Ibrahim]]>;
<![CDATA[Lukman Hakim]]>;
<![CDATA[Muhammad Arief Furqon]]>;
<![CDATA[Mochammad Erfian Ramadhan]]>
<![CDATA[ Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025) ]]>
Publisher : <![CDATA[Politeknik Negeri Malang ]]>
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DOI: 10.33795/elposys.v12i2.6990
<![CDATA[This research presents the development of an electric coffee roasting machine using the fluidized bed method, integrated with an Internet of Things (IoT)-based monitoring and control system. The system was designed to address limitations of previous prototypes that lacked remote temperature monitoring and automation. The roasting chamber utilizes a hot air stream to create fluidization, enabling uniform bean agitation and heat distribution. Key hardware includes a thermocouple sensor (MAX6675), an ESP32-S3 microcontroller, an AC light dimmer for heater control, and an electronic speed controller (ESC) for blower regulation. A user interface is provided via a TFT LCD screen and a custom mobile application connected through Firebase Realtime Database. Roasting profiles—consisting of bean type, target roast level, and batch weight—can be selected and executed automatically. The system was tested with various bean weights (50–250 g), demonstrating accurate temperature control, stable fluidization, and consistent roast levels. Results showed a temperature deviation below ±1°C from reference measurements, and all tests produced medium roast coffee with uniform color and aroma. The integration of IoT improves usability, process reliability, and potential scalability for small-scale roasting operations.]]>
