Jurnal Ilmiah Giga

Analysis of North Jakarta 500 kV Extra High Voltage Transmission Line using Shunt Reactor

Fuad Djauhari — 2025-01-30

To meet the need for electrical energy in Indonesia, especially in DKI Jakarta, PT PLN (Persero) built the Muara Karang Combined-Cycle Power Plant (CCPP), which has daily start-stop facilities with a capacity of 500 MW and 500 kV extra high voltage overhead lines between Muara Karang – Duri Kosambi is 30 km long. In high voltage and extra high voltage transmission lines, channel filling appears where the receiving side voltage is greater or smaller than the sending side voltage. This research aims to design a shunt reactor for reactive power compensation that can overcome the problem of voltage differences. The modeling uses ETAP 20.0 software. The required shunt reactor value is 164.8 MVAR. There was a decrease in the reactive power produced at the Muara Karang CCPP plant by 157,878 MVAR due to installing a shunt reactor. So that it can improve the voltage drop on the load buses from Extra High Voltage Substation (EHVS) Duri Kosambi, with each having a voltage pu value on the Cengkareng GI bus of 92.52%, Duri Kosambi VVIP GI bus of 93.91%, Grogol Baru GI bus of 93.7%, and GIS Cengkareng at 94.25%. This can maintain reliability on the 500 kV Extra High Voltage Substation Muara Karang transmission line.

Prototipe Sistem Deteksi Burung Menggunakan ESP32-Cam dan Algoritma YOLO

Muhammad Riesky Pratama — 2025-01-30

The agriculture and plantation sectors play a crucial role in the economies of many countries, including Indonesia, but often experience productivity declines due to pests. Technologies such as IoT and artificial intelligence now offer modern and more effective solutions to these problems. This research develops an automated system for repelling pests based on the ESP32-CAM camera module utilizing the YOLO (You Only Look Once) object detection algorithm and OpenCV image processing. The system is designed to accurately recognize and repel birds in real-time and can be accessed and controlled remotely through an IoT platform. Previous studies have used various sensors, including ultrasonic and PIR sensors, but these often suffer from limitations in accuracy and flexibility. The YOLO algorithm was chosen for its ability to provide superior speed and detection accuracy. The research results show that the developed bird detection has a precision value of 0.998, a recall of 0.981, and an F1 Score of 0.989, These metric values indicate that the system is very reliable in detecting birds. High precision guarantees minimal false detections, while high recall ensures that almost all birds are detected. The combination of both, reflected in the F1-score, indicates a good balance between precision and recall. Thus, this system can make a significant contribution to improving pest control efficiency and agricultural productivity.

Perancangan Penggerak Kapal Ikan Multifungsi 10 GT bertenaga Hybrid Memanfaatkan Energi Terbarukan

Rahmawati Djunuda — 2025-01-30

Fishermen operating in the waters of Southeast Sulawesi typically use fishing vessels powered by diesel engines. Additionally, the onboard basic electrical needs are met using batteries that must be manually charged, leading to increased time, costs, and workload for the fishermen. Given the vast potential of the region, an in-depth analysis is needed to explore the integration of renewable energy with diesel engines to better support local fishermen. This study aims to develop a design for a 10 GT multifunctional fishing vessel that incorporates a hybrid power system, utilizing solar energy as an alternative electrical energy source in combination with a diesel engine. The creation of this multifunctional vessel design will enable year-round operation by adapting to seasonal changes in Indonesia while maintaining high-quality catch production. The research findings indicate that a 10 GT fishing vessel with a length of 15 meters, width of 5 meters, and a draft of 0.75 meters can be equipped with a 40 PK diesel engine and a 60-volt electric outboard motor. The Compton method yielded a resistance of 9.8 kN and a power requirement of 50.5 kW. The Fung method calculated a resistance of 6.5 kN and a power of 33.3 kW, while the Holtrop method produced a resistance of 5.3 kN and a power of 27.4 kW. The proposed solar energy system for the vessel includes six solar panels, each with a capacity of 250 WP, providing power for both the ship's engine and onboard electrical equipment.

Analisis Kekuatan Material Komposit berdasarkan Variasi Resin dan Katalis pada Material Kapal berbahan Fiberglass

Samaluddin Samaluddin — 2025-01-30

Composites consist of 2 inhomogeneous materials, namely matrix as a binder in this case resin mixed with catalyst and reinforcement as reinforcement in this case is glass fiber (fiberglass). Given the paucity of knowledge regarding the ratio of the use of catalyst and the appropriate resin is One of the issues that has to be fixed is that if the use of catalyst is too much it will provide excessive heat to the material but if given too little it can reduce the function of catalyst as reinforcement. Craftsmen in Bau bau area only based on their experience in mixing resin and catalyst in the manufacturing process. This study aims to obtain the appropriate ratio of catalyst and resin usage so as to obtain good shipbuilding results, structurally strong and economically feasible and can be applied to the community. In light of the research study's findings, it can be said that the fiberglass composite material with 1% catalyst has a tensile strength value of 3034 N with a stress of 202 N/mm². The composite with 1.25% catalyst has the highest tensile strength of 3227 N and a stress of 215 N/mm². The composite with 1.5% catalyst has a tensile strength of 2462 N and a stress of 164 N/mm². The composite with 1.75% catalyst has a tensile strength of 2368 N and a stress of 157 N/mm². The amount of catalyst in fiberglass composites rose from 1% to 1.25% and fell from 1.5% to 2% in terms of tensile strength.

Analisis Pengaruh Morfologi Terhadap Ketebalan dan Zona Pengkayaan Endapan Nikel Laterit PT. X Provinsi Sulawesi Tengah

Dira Susanto — 2025-01-30

Indonesia is one of the countries with the largest nickel reserves in the world. Nickel is a metal element that has a high selling value in the global market. This study aims to determine the influence of morphology on the thickness and enrichment zone of laterite nickel deposits. Research methods include literature studies; Observing morphology and collecting samples under the surface; laboratory analysis using X-ray fluorescence (XRF); and data analysis. The results of the study explained that the morphology at the research location including low hills/hills has a slightly sloping slope with a relatively thick ore layer thickness of 8.62-13 meters and a rather steep slope with a relatively thin ore layer thickness of 5-12 meters. The distribution of Fe and Ni content increased in the morphology of low hills/hills with a slightly sloping-slightly steep slope with an average of 41.1-31.1% Fe and 1.4-1.3% Ni on average while a steep slope with low Ni with an average of 1.1% where morphology has a role/influence on weathering and supergene enrichment enrichmentso that groundwater containing nickel enters through rock cracks/crevices and brings the nickel element down to the saprolite layer, because the element Ni is mobile/easily soluble carried by water. Meanwhile, the element Fe has an enrichment process in the limonite layer because the element Fe is immobile or cannot be carried or dissolved by water.