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Jurnal Teknologi Elekterika
Published by Politeknik Negeri Ujung Pandang
ISSN : 14128764     EISSN : 26560143     DOI : http://dx.doi.org/10.31963/elekterika
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
Jurnal Teknologi Elekterika: Jurnal penelitian PNUP sebagai wadah komunikasi ilmiah antar akademisi, peneliti dan praktisi dalam menyebarluaskan hasil penelitian bidang rumpun elektro dan informatika yaitu teknik listrik, energi, elektronika, kontrol, telekomunikasi, komputer dan jaringan, dan Multimedia.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 179 Documents
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Design Of Decision Support System Final Project Topic In Computer And Network Engineering Study Program State Polytechnic Of Ujung Pandang Tamrin, Fadli; Olivya, Meylanie; Azzahra, Maryam
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v22i1.5484

Abstract

This research is motivated by the difficulties often experienced by students in determining the topic of their final assignment that suits their interests and abilities, which results in delayed graduation. The purpose of this study is to create an accurate final assignment topic decision support system model using the Random Forest Algorithm, design a website-based decision support system to assist students in determining the topic of their final assignment, and evaluate the efficiency and quality of the system. The data used are academic grades and interests of students in the Computer and Network Engineering study program at the Ujung Pandang State Polytechnic. The results of the study show that the Random Forest Model is able to produce final assignment topic recommendations with a Cross-validation accuracy of 61.36%. The website-based decision support system designed can assist students in determining the topic of their final assignment according to their interests and academic abilities, as well as improve the efficiency and quality of the final assignment topic selection process. This research contributes to making it easier for students to find the right final assignment topic, as well as providing guidance for the development of similar recommendation systems in the future.
IDENTIFICATION TYPE OF GAS BASED ON DISCHARGE TIME MEASURING IN LIGHT EMITTING DIODE SERIES Prasetiyo, Bagus; Exaudi, Kemahyanto; Mahjud, Ichsan
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v22i1.5494

Abstract

Nowadays, gas or vapor detection to observe environment situation is very required in many fields. Spectrophotometer method is always used to analyze contain and gas concentrate based on the absorption intensity of light by the gas sample. This research used Light Emitting Diode (LED) series act as a transmitter and light receiver (detector). Above detector surface is layered by a chemical membrane that selective in to the type of gas according the polarization level. This vapor absorption in chemical membrane can cause shrinking the intensity of light that hit the detector. This light will be discarding the load in internal capacitor of the detector. Duration internal sudden discharge of the LED depends on light intensity that hit it. Detector LED series that layered by different chemical membrane is produce different an absorption phase that patterning different discharge time. In this experiment, alcoholic solution and gasoline are used as vapor samples. Identify types of gas using imitation nerve connection method to finding out every type of gas with 80% success.
Design of Microstrip Antenna Array for 5G Communication Systems Mimsyad, Muhammad; Rauf, Awaluddin; Rauf, Yuliana
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

For the time being, the fifth generation (5G) communication system has been realized in many countries and the number of 5G subscribers is very large. Unlike previous generations that only focused on improving network capacity, the 5G communication systems extends telecommunication services from humans to objects (things), and also from consumers to industries. This enables a wide range of services from conventional mobile broadband to industry 4.0, virtual reality (VR), Internet of Things (IoT), and automatic driving. The values ​​of 5G services and applications greatly support the mobility and flexibility of today's customers such as remote surgery in hospitals, online education, driverless vehicles, unmanned delivery, robots, smart healthcare, industrial automation. This study presents the design and realization of a 4×4 rectangular microstrip antenna array. This antenna can be applied to support 5G communication. The antenna array configuration is arranged uniformly. For antenna excitation, an inset feed transmission line is employed to each antenna element. The antenna array has been validated and works at a frequency of 2.3 GHz, with an HPBW of 30° in the E-plane. Meanwhile, based on measurements, the gain and bandwidth values ​​are 13.51 dBi and 100 MHz respectively.
Analysis of Main Protection Replacement of Bay Line Parepare - Suppa from Distance Relay to Line Current Differential Relay of 150 kv Parepare Substation Fattah, Darmin; Sultan, Ahmad Rizal; Gaffar, Ahmad
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

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Abstract

Bay Line Parepare - Suppa uses relay distance as the main safety. With a short transmission line distance, a reliable protection system is needed to overcome disturbances that occur in the system. With the development of time, and also to further improve the main transmission safety, the distance relay as the main protection is replaced with LCD (Line Current Differential) with changes in SPLN T5.002: 2010 to SPLN T5.002: 2021. This study aims to characterize the impedance value, the results of the SIR (Source Impedance Ratio) process and the effect of revenue obtained in replacing the main protection of the Parepare - Suppa bay line from relay distance to LCD (Line Current Differential) relay. Based on the calculation of the impedance seen in the relay distance on the Parepare - Suppa high voltage overhead line, the results are very small (0.1286 - 0.321 ohms). The results of the analysis show that the Source Impedance Ratio (SIR) obtained on the Parepare - Suppa conductor is 4.015 Ohm, while after replacing the relay, the gain or profit obtained is Rp. 1,112,340,880, -
ASSESSMENT OF CURRENT TRANSFORMER USING HEALTHY INDEX AT ULTG PANAKKUKAN Rizqan, Uais; Thaha, Sarma
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

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Abstract

Current transformers (CTs) play a crucial role in the measurement and protection of electrical networks, directly impacting the performance and stability of the distribution system. Over time, the condition of current transformers can degrade due to factors like age, environmental conditions, and overloads. To ensure the health status of these transformers, an assessment method using the Healthy Index (HI) is applied. This research utilizes data from tests on tan delta, insulation resistance, ratio, thermography, excitation, and the age of the current transformer. The data is categorized into two factors: the Conditional Assessment Factor (CAF), which provides a real-time condition overview from tan delta data (where values above 1% indicate poor and values below or equal to 1% indicate good condition), insulation resistance (where values below or equal to 1 Mega Ohm/1kV indicate poor and above 1 Mega Ohm/1kV indicate good), thermography (where temperatures above 4°C are considered poor, temperatures between 1°C and 3°C are medium, and normal temperatures relative to ambient conditions are good), and ratio; and the Performance Assessment Factor (PAF), which assesses equipment performance based on transformer age. Age classifications are 20-35 years as poor, 16-20 years as medium, and below 16 years as good. Following the gathering of CAF and PAF data, a systematic calculation of each factor's weighting is conducted using the Assessment Healthy Index (AHI) Calculation method, resulting in assessment ratings of 1 for poor, 6 for medium, and 9 for good. From these categories, conclusions can be drawn regarding the next steps for the current transformer, determining whether repair or replacement with a new transformer is necessary.
LIGHTNING PROTECTION SYSTEM FOR THE MAIN POWER HOUSE BUILDING SULTAN HASANUDDIN AIRPORT DEVELOPMENT PROJECT Pratama, Dimas Yudha Ari; Purwito, Purwito; Salim, Agus
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

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Abstract

Lightning, often called lightning, is a natural phenomenon that is common during the rainy season. Lightning appears as a flash of bright light followed by a rumbling sound called thunder. This phenomenon occurs due to the potential difference between clouds and the earth or between clouds, with negative charges in clouds being released towards the earth to achieve equilibrium. This process creates lightning and lightning sounds. This phenomenon is more common in the rainy season because of the high moisture content in the air which lowers the insulation power, making it easier for electric current to flow. The danger of lightning can cause damage to buildings, and power grids, and fatalities. This research was conducted at PT Wijaya Karya (Persero) Tbk., at the Sultan Hasanuddin Airport Development Project, Maros Regency, South Sulawesi. The research procedure begins by asking permission from the company's management, followed by data collection from the Production, Engineering, and QC teams. Data collection is carried out through literature studies, field observations, interviews with related teams, and documentation. The data obtained will be analyzed to determine the lightning protection system and earth resistance measurement at the Main Power House Building. The calculation includes the density of the lightning strike, the area of the protection area, and the frequency of the strike. The determination of the need for a protection system is carried out based on the results of the calculation, and if necessary, the protection efficiency will be calculated using the rolling ball method. From the calculation results, the minimum protection value in the rolling ball method is 9.7 meters with a maximum protection of 20 meters. In the results of the measurement of the grounding resistance for lightning rods, the following results were obtained (1.42 Ohms; 0.92 Ohms; 0.15 Ohms; 1.61 Ohms). The result does not exceed the limit of 5 Ohms.
Performance Evaluation of 3x1 MW Mini Hydro Power Plant in Malili District, East Luwu Regency Irfan, Nafil Rif'at
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

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Abstract

One form of simple renewable energy that is widely used is water energy (hydro power). one form of water energy utilization is the MiniHydro power plant,. MHP was chosen as an alternative energy because it has several advantages over other power plants, such as being environmentally friendly, more durable, smaller operating costs and suitable for remote areas. The purpose of this research is to evaluate the performance of the plant in terms of continuity of service and analyze the factors that affect the continuity of service of the plant and analyze the level of reliability of the plant based on the value of energy availability produced by the MHP. the methods in this research are literature study, observation, data collection and processing. Based on the results of the study, it is known that the electrical energy produced by the Ussu Malili MHP for one year (2023) amounted to 16,439,486 kWh and the resulting energy efficiency reached 67%. The resulting operating time is 81%, maintenance time reaches 3.9%, and disruption time is 21%, while the reliability of the power system based on the availability of energy at the Ussu Malili MHP is 79%.
Estimate Equivalent Circuit Internal Resistance Battery LiFePO4 Farid, Andi Fahrul; Itasari, Maya; Asri, Andarini; Thaha, Sarma; Nurfadhilah, Annisa; Ridhwan , Muhammad
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

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Abstract

This research investigates the internal resistance and capacitance characteristics of Lithium Iron Phosphate (LiFePO4) batteries utilizing an equivalent circuit model based on resistor-capacitor (RC) networks. The growing integration of batteries in diverse applications, including electric vehicles and renewable energy systems, necessitates robust battery health monitoring strategies. This work employs current and voltage data acquired during battery discharge, subsequently analyzed using MATLAB 2023b software to determine the pertinent RC parameters. A third-order Equivalent Circuit Model (ECM) of RC, comprising three RC pairs, is implemented to enhance the precision of parameter estimation. The results demonstrate a strong correlation between the number of RC pairs and the accuracy of dynamic battery response representation. A higher-order model generally yields more precise estimations of battery performance. However, increasing model complexity can lead to overfitting, potentially diminishing the model's ability to accurately reflect actual battery behavior. This study contributes significantly to the understanding of LiFePO4 battery internal characteristic modeling and underscores the importance of balancing model fidelity with computational complexity.
THE STUDY OF THE LOAD FLOW AFTER THE ADDITION OF MOUTONG’S MAIN SUBSTATION IN THE ISOLATED SYSTEM OF KOTARAYA Alfira, Wisna Saputri; Su, Vania Amelinda; Aksan, Aksan
Jurnal Teknologi Elekterika Vol. 22 No. 1 (2025)
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

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Abstract

PT. PLN (Persero) UP3 Tolitoli consists of four customer service units, namely ULP Leok, ULP Bangkir, ULP Moutong, and ULP Kotaraya. The electricity supply in ULP Kotaraya comes from an isolated system supported by PLTD Kotaraya, PLTD Tomini, and PLTD Palasa. During the dry season from September to November 2023, the power deficit at the power plants reached 950 kW, causing rolling blackouts. In order to overcome this problem, PLN UP3 Tolitoli plans to build a substation near Ongka Malino District to supply the Kotaraya system, which will improve flexibility and customer satisfaction. This study aims to implement the system condition through system testing based on the design of the Kotaraya isolated system after the operation of the Moutong Substation using software. The results of this study show that after the Moutong Substation operates, the functions of PLTD Kotaraya and PLTD Palasa change into voltage controllers, resulting in a power system with medium-voltage busbar voltage values that are more stable based on the standards used by PLN, with a nominal range of +5% and -10% against 20 kV.

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