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Zulhajji, Zulhajji
Universitas Negeri Makassar
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Journal : Journal of Electrical Engineering and Informatics

 1 
SHORT CIRCUIT FAULT ANALYSIS IN THE ELECTRIC POWER DISTRIBUTION SYSTEM AT PT PLN (Persero) UP3 SOUTH MAKASSAR ULP KALEBAJENG USING ETAP Nur Annisa Dewi Nayla; T Mangesa, Riana; Imran, Andi; Firdaus, Firdaus; Zulhajji, Zulhajji
Journal of Electrical Engineering and Informatics Vol. 1 No. 1 (2023): JOURNAL of ELECTRICAL ENGINEERING and INFORMATICS
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v1i1.420

Abstract

Short circuit fault analysis is needed to determine the amount of short circuit current flowing in a system. This study discusses the single-phase short-circuit current to the ground at the point where the disturbance occurs from the base of the network to the end of the Malewang feeder network. The purpose of this study was to determine the amount of short circuit fault current in the Electric Power Distribution System at PT PLN (Persero) UP3 South Makassar ULP Kalebajeng. This study used the ETAP program and manual calculations. The results of the study found that the contribution of the largest single-phase short-circuit fault current to the ground in the Malewang feeder occurred on Buses located at the base of the network close to the Substation, namely Bus 1 (Exim-Rec Kalaserena) of 0.311 kA, while thesmallest Buscontribution occurred on Buses located at the end of the network far from the Substation, namely Buses 14 (Bilonga) of 0.292 kA. From the results of the study, it can be concluded that the farther the interference bus is from the Substation, the greater the channel impedance. The greater the impedance, the smaller the short-circuit current.
DEVELOPMENT OF WATER QUALITY MONITORING SYSTEM IN SHRIMP PONDS BASED ON INTERNET OF THINGS (IOT) Musdalifah, Musdalifah; Ruslan, Ruslan; Zulhajji, Zulhajji
Journal of Electrical Engineering and Informatics Vol. 2 No. 1 (2024): JOURNAL of ELECTRICAL ENGINEERING and INFORMATICS
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v2i1.4503

Abstract

This type of research is research and development (R&D) which uses the waterfall development model. The aim of this research is to produce a water quality monitoring system in shrimp ponds based on the Internet of Things (IoT) and to find out the results of testing the development of the system using the ISO 25010 standard. This development involves the application of ESP32, Relay, Toa Siren, DS18b20 Temperature Sensor, pH Sensor Module 4502C, Water Salinity and Turbidity Sensor which allows users to get real-time pond water quality monitoring information via the Telegram application. The test results for the reliability aspect have met the fault tolerance sub-characteristic standards because the percentage of measurement error obtained for the temperature sensor was 0.10%, pH 0.54%, salinity 1.19%, and turbidity 1.00%, still within the permitted tolerance limits. Functionality suitability testing shows that this tool obtains a percentage of 100%, indicating that the system is suitable for use. This tool also meets the portability aspect because it can be used on various devices with different operating systems. Apart from that, the usability evaluation results from user responses are in the very good category with an average of >4.2.
STUDY ON THE TESTING OF POWER BREAKERS (PMT) IN THE 150 KV TRANSFORMER BAY AT THE PANAKKUKANG SUBSTATION Salam, Fardian; Fathahillah, Fathahillah; Zulhajji, Zulhajji
Journal of Electrical Engineering and Informatics Vol. 2 No. 1 (2024): JOURNAL of ELECTRICAL ENGINEERING and INFORMATICS
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v2i1.4552

Abstract

The Circuit Breaker (PMT) plays a very important role in the substation system because the PMT is the equipment responsible for disconnecting the load current during a disturbance. This study aims to determine the results of insulation resistance testing, contact resistance testing, and simultaneity of the Circuit Breaker (PMT), evaluate the quality of the PMT, and determine the results of the NGR (Neutral Grounding Resistor) testing at the Panakkukang Substation. This research employs a quantitative method using an ex post facto research design. The research was conducted at PT. PLN (Persero) Panakkukang Substation, with the object being the 150 kV transformer bay Circuit Breaker (PMT). The results obtained from this study show that the insulation materials and contact components of the Circuit Breaker installed in transformer bay 2 are still in good and safe condition. The Circuit Breaker can trip according to normal simultaneity performance. The quality of the PMT is still in safe and operational condition, and the NGR (Neutral Ground Resistor) test results for transformer bay 2 indicate that it is still in good and safe condition.
ANALYSIS OF CONTROL SYSTEM RELIABILITY AT PLTG UPDK TELLO Ardiansyah Al Izzah; A Lamada, Mustari; Zulhajji, Zulhajji; Imran, Al; T Mangesa, Riana
Journal of Electrical Engineering and Informatics Vol. 2 No. 2 (2025): Journal of Electrical Engineering and Informatics
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v2i2.6802

Abstract

This study analyzes the reliability of the control system at the UPDK Tello Gas Power Plant (PLTG) with a focus on critical components that affect systemperformance. The evaluation was conducted using three main indicators: availability, Mean Time to Failure (MTTF), and Mean Time to Repair (MTTR), andtheir impact on operational efficiency. Quantitative descriptive research method was applied through Failure Mode and Effects Analysis (FMEA) analysis, direct observation, and maintenance document study. The results showed variations in reliability between components. In GE#1, the TCDA card has the highest RPN value of 156, availability 0.9995435874, MTTF 13139.99999 hours, MTTR 5.999999999 hours, reliability 0.1353352832, and operationalefficiency 99.95431704%. At GE#2, the exhaust thermocouple has the highest RPN of 192 with a reliability of 0.04978706857, while the 1.5 A fuse has the lowest availability of 0.9994675591, MTTF of 26279.99999 hours, MTTR of 14 hours, and operational efficiency of 99.94672755%. The average operational efficiency at GE#1 and GE#2 are 99.9866758% and 99.98731608% respectively. The results show that the system still meets operating standards although there are significant differences between the RPN values and other reliability indicators. Components with high RPN do not always have the lowest availability or operational efficiency. This research emphasizes the importance of a multi-indicator approach in reliability analysis as well as the need for customized maintenance strategies for each critical component.
DESIGN AND DEVELOPMENT OF A WEB-BASED MENU ORDERING SYSTEM AT KOPITAWA CAFE USING QR CODE Erwin Sudirman; Zulhajji, Zulhajji; Muis Mappalotteng, Abdul
Journal of Electrical Engineering and Informatics Vol. 2 No. 2 (2025): Journal of Electrical Engineering and Informatics
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v2i2.6805

Abstract

This study aims to determine the design outcomes and testing results of the menu ordering system at Kopitawa Café.The research employed an R&D (Research and Development) approach and utilized the waterfall development model, incorporating data collection techniques such as observation, interviews, and questionnaires. Based on the study's findings, a web-based menu ordering system for Kopitawa Cafe was successfully designed and developed using QR codes. The system was tested following the ISO/IEC 25010 standard, which includes eight testing aspects. The results indicate that the designed system is feasible and ready for use. This study aims to design and develop a web-based menu ordering system at Kopitawa Cafe using QR Code technology. The research method follows Research and Development (R&D) with the Waterfall development model, including requirements analysis, system design, implementation, verification, and maintenance. The system was tested based on ISO/IEC 25010 standards, covering eight key aspects: functionality suitability, usability, reliability, performance efficiency, maintainability, compatibility, portability, and security. The results indicate that the developed system achieved 100% success in functionality testing, with a usability score of 91.03%, categorized as "excellent". Performance testing using GTMetrix resulted in a 57% (Grade C) score, with a 5.2-second loading time. Portability testing confirmed that the system operates smoothly on various devices and operating systems. Security testing with Quttera verified that the system meets basic security standards. However, this study has some limitations, including the need for further optimization of system performance, dependency on Firebase, which may impact scalability, and security aspects that require additional penetration testing. Future research should focus on improving system speed, enhancing security features, and exploring alternative database solutions.
Monitoring System for Temprature, Humidity, and Ammonia Gas in Laying Hens Cages Based on Internet of Things Fathur Ramadhan, A.M.; Zulhajji, Zulhajji; Haripuddin, Haripuddin
Journal of Electrical Engineering and Informatics Vol. 3 No. 1 (2025): Journal of Electrical Engineering and Informatics
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v3i1.8060

Abstract

This study focuses on the development of an Internet of Things (IoT)-based monitoring system designed to measure and control temperature, humidity, and ammonia gas levels in laying hen cages to enhance environmental management efficiency, animal welfare, and productivity. The research employs a Research and Development (R&D) method using a prototyping model conducted at UD. Ayam Ras Petelur, Gowa Regency, Indonesia. The developed system integrates DHT11, and MQ-135 sensors connected to an Android application via NodeMCU ESP8266 and Firebase, enabling real-time monitoring, visualization, and remote access. Through this integration, farmers can instantly obtain environmental data, receive notifications when parameters exceed safe thresholds, and take immediate corrective actions to maintain optimal conditions for the chickens. Evaluation based on the ISO 25010 quality model shows that the system achieves 100% functional suitability and 92.6% usability, which indicates excellent performance and high practicality for end users. Sensor accuracy testing reveals reliability rates of 97.37% for temperature, 97.83% for humidity, and 95.50% for ammonia gas concentration, confirming the system’s precision and consistency in data measurement. The results demonstrate that the IoT-based monitoring system developed in this study is highly feasible, efficient, and accurate for real-time management of poultry cage environments. Overall, this research contributes to the adoption of smart farming technologies in Indonesia’s poultry industry, promoting data-driven decision-making and sustainable livestock management practices.
Analysis of the Level of Satisfaction of Electrical Engineering Education (PTE) FT-UNM Students in the Use of the Single Academic Service System (My-Sams) Application Wati, Hikma; Yusuf Mappeasse, Muhammad; Zulhajji, Zulhajji
Journal of Electrical Engineering and Informatics Vol. 3 No. 1 (2025): Journal of Electrical Engineering and Informatics
Publisher : Fakultas Teknik Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jeeni.v3i1.7738

Abstract

This study evaluates the satisfaction level of students in the Electrical Engineering Education Department, Faculty of Engineering, Makassar State University (PTE FT UNM) in using the My-SAMS (My Single Academic Management System) application based on the End User Computing Satisfaction (EUCS) model, which measures satisfaction through content, accuracy, format, ease of use, and timeliness. Using a quantitative ex post facto design, data were collected from 136 students (2018–2023 cohorts) through a 20-item Likert-scale questionnaire. The research instruments were tested for validity using the product-moment correlation and for reliability using Cronbach’s Alpha, both showing acceptable results. Data analysis employed descriptive statistics using SPSS 23 and Excel 2021 to identify satisfaction patterns. The findings showed that students were moderately satisfied with content (45%), format (54%), ease of use (57%), and timeliness (46%), while the accuracy dimension was rated dissatisfied (33%). These results suggest that while My-SAMS is user-friendly, issues remain regarding data accuracy and synchronization. It is recommended that system developers enhance data validation and integration processes and provide continuous operator training to ensure data consistency. In conclusion, the study emphasizes that My-SAMS has achieved moderate success in meeting user expectations but requires further improvements in information accuracy and reliability to strengthen trust and system performance. The findings are expected to serve as a reference for improving academic digital services and as a foundation for further research on user satisfaction in academic information systems.
Co-Authors A Lamada, Mustari A. Karim, Sugeng Aditya Martha Pratama Akhyar Muchtar, Akhyar Al Imran Alawiah Ahmad Alimuddin Sa’ban Miru Aminuddin Bakry Andi Akram Nur Risal Andi Imran Andi, Tenriola Ardiansyah Al Izzah Azis, Putri Alysia Bayu Lopari, Argia Dewi Fatmarani Surianto Edi Suhardi Rahman Erwin Sudirman Fahmi, Moghfina Moghfina Fahmi, Moghina Fathahillah Fathahillah Fathur Ramadhan, A.M. Firdaus Firdaus Firdaus, Muliaty Fitri Fitri Hafid, Yuliati Hamris, Hamidah Haripuddin . hikma wati Imran, Al Iwan Suhardi Jumadi Mabe Parenreng Karim, Sugeng A Karim, Sugeng A. karolus karen Kholik Prasojo Makmur, Elfira Mangesa, Riana T Mappeasse, Muhammad Yusuf Marthen Paloboran Miftahul Khair Mahpul Miru, Alimuddin Sa'ban Moghina Fahmi Mudarris, Mudarris Muh Fathur Rahman Muh Usman Mustari Muh. Usman Mustari Muh. Yusuf Mappeasse Muhammad Yusuf Mappeasse Muhammad Yusuf Mappeasse Muis Mappalotteng, Abdul Mulawarman Mulawarman Muliaty Firdaus Muliaty Yantahin Muliyati Yantahin Mulyati Yantahing Musdalifah Musdalifah Nasir Malik Nir Dillah Umrah Suardi Nur Annisa Dewi Nayla Nur Annisaa Badia Nur yahira Nurul Ulfa Nurul Wahidah Pratama, Aditya Martha Purnamawati Purnamawati Putratama, Adji Riana T Mangesa Riana T. Mangesa Riswan Riswan Ruslan Ruslan Sadri, Abdul Rijal Salam, Fardian Sanatang Sari, Dessy Ana Laila Sri Wahyuni Suhartono Suhartono Syahrul Syahrul Syarifuddin Kasim T Mangesa, Riana T, Riana. Tangkin Mangesa, Riana Tannarong, Yudhy Tjandi, Yunus Vinni Melfionita Wahyu Adi Saputra Yantahin, Muliaty Yunus Tjandi Yusuf Mappeasse, Muhammad Zainuddin, Zainuddin Zurriyatun Thoyyibah