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Nyoman Gunantara
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Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315
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INDONESIA
Jurnal SPEKTRUM
Published by Universitas Udayana
ISSN : 23023163     EISSN : 26849186     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering
Jurnal SPEKTRUM is peer review journal, published four times a year by the Department of Electrical Engineering, Faculty of Engineering, Universitas Udayana. This journal discusses the scientific works containing results of research in the field of electrical, include: power systems, telecommunications, computers, informatics, controls, and electronics. Authors are expected to include original scientific papers in accordance with the scope of the discussion of this journal including all aspects of the theory and practice are used.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 677 Documents
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PEMBUATAN PROTOTYPE PLTB TURBIN ANGIN SAVONIUS TIPE-U SUMBU VERTIKAL DENGAN SUDUT KELENGKUNGAN SUDU 135o MENGGUNAKAN SUMBER ANGIN BUANGAN EXHAUST KITCHEN Wredhira Wirartama, I Wayan Gde; Arta Wijaya, I Wayan; Janardana, I Gusti Ngurah
Jurnal SPEKTRUM Vol 10 No 4 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i04.p32

Abstract

Bali is known as a tourism island for both local and foreign tourists, therefore there are many hotels, resorts and restaurants for tourists. In order to fulfill the Bali Clean and Green program, the Regional Government of Bali encourages tourism-related businesses, such as hotels, to construct sources of electricity from new renewable energy. The authors use waste energy in the form of exhaust wind from the kitchen exhaust fan in addition to using natural wind energy. Artificial wind is created when waste energy from exhaust fans is converted into a form that can be used to rotate or power a generator. Making a PLTB prototype with a vertical axis Savonius turbine with a blade curvature angle of 135 degrees is the goal of this research in order to increase the wind sweep area and obtain the highest output ratio. This study employed a quantitative methodology. This study was able to maximize the exhaust fan's wind speed, which was 5.84 m/s. The highest generator output value is at 2.93 vdc, 0.62 mmA, and 1.80 Watt for a 2-blade turbine and 40 ohm load, and at 3.22 vdc, 0.74 mmA, and 2.39 Watts for a 4-blade turbine and 40 ohm load.
APLIKASI MATCHMAKER ADOPSI HEWAN PELIHARAAN (OPet) BERBASIS ANDROID MENGGUNAKAN METODE MACHINE LEARNING Wijaya Kusuma Yasa, Kadek; Nunut Asihanna, Ester; Sudarma, Made; Care Khrisne, Duman; Arsa Suyadnya, I Made
Jurnal SPEKTRUM Vol 11 No 2 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

The importance of pet adoption is very important in efforts to support the prevention of animal abandonment. Currently, the pet adoption system in Indonesia still largely relies on a manual approach. This process is carried out directly without paying attention to important aspects of the match between the pet and its adopter, which can result in a lack of information which has a long-term impact on the abandonment or return of the pet. Based on these problems, this research aims to design and create an application that can facilitate the pet adoption process. This application was built for Android-based mobile devices by utilizing Machine Learning methods to provide personalized pet recommendations based on user preferences using Content-Based Filtering and making it easier to identify pet breeds from photos uploaded or selected by users using Image Classification. The pet data collected was sourced from the Kaggle, TensorFlow, and GitHub websites. It is hoped that the results of this research can overcome the problem of pet adoption in a better and more sustainable way and will not only provide benefits for abandoned animals, but can also reduce cases of animal abandonment due to irresponsible owners.
RANCANG BANGUN SISTEM PENGEMUDIAN ELEKTRIK PADA MOBIL LISTRIK AGNIJAYA WEIMANA Mustika Wiyasa, I Kd; Satya Kumara, Nyoman; Raka Agung, I Gusti Agung Putu
Jurnal SPEKTRUM Vol 10 No 4 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i04.p23

Abstract

Electric energy can be used as a substitute for oil fuel. One of the efforts to address air pollution is through the Energy-Efficient Car Contest (KMHE), which emphasizes vehicle efficiency. In this study, the electric propulsion system in the electric car WEIMANA, which focuses on the selection of an electric motor, conducted tests on a BLDC motor to determine the required power of the BLDC motor. In the selection of the electric motor, calculations were made for rolling resistance, aerodynamic resistance of the car, power, and required torque. Based on the discussion's results, the chosen motor is the qs-motor brand with a capacity of 800 W, 500 RPM, torque of 80 Nm, and operating voltage of 48 – 70 VDC. The magnitudes of rolling resistance, aerodynamic resistance of the car, power, and torque are 16.67 N, 7.83 N, 864.7 W, and 59.22 Nm, respectively. The selected motor has been able to propel the WEIMANA car with driver weights of 45 kg, 55 kg, and 65 kg at speeds of 20 km/h and 30 km/h. The highest average power efficiency of the controller is 90.31% with a driver weight of 55 kg. The highest average power efficiency of 88.03% is achieved at a speed of 20 km/h.
PERANCANGAN POWER SUPPLY UNTUK CHARGING STATION KENDARAAN LISTRIK RODA DUA DENGAN SISTEM PLTS ON GRID Nadhif Dewayana, Zevardy; Setiawan, I Nyoman; Dwi Giriantari, Ida Ayu
Jurnal SPEKTRUM Vol 11 No 1 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2024.v11.i01.p14

Abstract

Electric vehicles use electrical energy as a substitute for fossil energy. Like gasoline vehicles that require gasoline filling facilities, electric vehicles also require electric energy charging facilities or commonly referred to as charging stations. One of the utilizations of solar power plant can be used for charging electrical energy at the charging station. In this study, a Power Supply Design was carried out for Charging Station for Two-Wheeled Electric Vehicles with Solar Power Plant System on grid in Widya Sabha Building Parking Lot, Udayana University. With the calculation of the energy needed in the Power Supply, the solar power plant design and manufacturing costs can be made. The design of this charging station can accommodate 10 electric motorbikes with solar power plant that can provide energy for 2 electric motorbikes per day for 9 hours of work alternately. By using 11.450 Wp solar panels arranged in series and 1 inverter with a capacity of 4.6 kW, this design produces 8.229 MWh per year. The total initial investment in this design based on market prices in Indonesia is IDR 99.213.000. Based on the investment feasibility, it shows that the investment in this design is feasible to implement.
ANALISA TEKNIS DAN EKONOMIS PEMANFAATAN PLTS OFF-GRID PADA SISTEM KENDALI TINGGI MUKA AIR PADA TANDON DI SEKAR ANUGERAH PENGLIPURAN Fadlikha Ramadhan, Fikri; Elba Duta Nugraha, I Putu; Janardana, I Gusti Ngurah
Jurnal SPEKTRUM Vol 11 No 2 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

To fulfill thel daily need for clean water, it is necessary to expand the water supply system to reduce the risk of uncontrolled water use. Water Level Control (WLC) is a control system that can control water capacity according to what is required automatically. The design of the Off-Grid PLTS in Sekar Penglipuran as an energy supplier for the water level control system in the reservoir and the start of the pump in the reservoir. Utilization of PLTS in the operation of water level control systems in reservoirs as well as knowing the power generated and component requirements as well as the feasibility of investing in Off-Grid PLTS. This research includes the design of Off-Grid PLTS by analyzing technically and economically. The results of this research are that the Off-Grid PLTS design is estimated to be able to produce power for the control system needs of 525.76 Wp and can produce an energy yield of 932.575 kWh/year with a performance ratio of 85%. Designing a PLTS requires an initial investment cost of Rp. 70,330,605,- with an NPV of -Rp. 65,668,939,506,- so based on economic aspects, designing an Off-Grid PLTS is not worthy of investment.
RANCANG BANGUN MESIN HOT PRESS LIMBAH PELASTIK SERTA PERHITUNGAN KONSUMSI ENERGI PENCETAKAN Wiawan Adhi Guna, I Putu Gede; Indra Partha, Cokorde Gede; Arta Wijaya, I Wayan
Jurnal SPEKTRUM Vol 11 No 1 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2024.v11.i01.p5

Abstract

The issue of waste, particularly plastic waste, remains a challenging problem without a definitive solution. Plastic waste, especially that made from High-Density Polyethylene (HDPE), takes an extensive amount of time to decompose. Currently, plastic recycling machines are priced in the hundreds of millions, making them less accessible. Therefore, there is a need for affordable machines that function effectively alongside existing ones. This research introduces a hot press machine for recycling HDPE plastic. The hot press machine is capable of recycling HDPE plastic waste and offers the advantages of being portable, compact in size, and cost-effective. Following the design phase, the machine is capable of producing plastic boards with a thickness of 1 cm, utilizing 3.7 kg of plastic, and requiring a molding time of 2 hours and 15 minutes at a pressure of 4.36 MPa.Subsequent testing involved analyzing three factors to determine the significant influence of factor A (heating temperature) and factor B (heating time) on energy consumption. The goal was to identify the interaction that yielded the smallest average energy consumption.
EVALUASI UNJUK KERJA IOT, SISTEM KONTROL DAN MONITORING SUHU DAN KELEMBAPAN PADA RUANG FREEZER MENGGUNAKAN APLIKASI BLYNK (STUDI KASUS PADA PT. AEROFOOD ACS DENPASAR) Krisna Mahendra, Made; Dyana Arjana, I Gede; Suartika, I Made
Jurnal SPEKTRUM Vol 10 No 4 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i04.p14

Abstract

The implementation of temperature control and monitoring system in the freezer room at PT Aero Food ACS company plays a crucial role in maintaining the quality of stored food raw materials. Therefore, an appropriate and efficient control system is required to preserve the quality of stored meat. To address this, a system was developed using IoT-based Blynk application for control and monitoring, utilizing WEMOS as the microcontroller and DHT22 as the sensor. Before the system is deployed in the company, a performance test and evaluation are necessary to ensure that the system functions correctly and complies with the company's SOP. During the testing phase, the control system operated well and was in accordance with the company's SOP.
EARLY WARNING SYSTEM PELEPASAN BEBAN PADA PENYIMPANAN ENERGI GEDUNG DH TEKNIK ELEKTRO Padwita Darma, I Made Angga; Dyana Arjana, I Gede; Setiawan, Widyadi
Jurnal SPEKTRUM Vol 11 No 2 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

Abstract

The aim of this research is to produce a prototype of an Early Warning System (EWS) for load shedding in energy storage based on ESP32. The load shedding system functions as a load manager to ensure that VIP load classes can be supplied for a longer duration. This load shedding system uses a control system from ATmega 328. The load shedding system utilizes the voltage level read on the battery, allowing it to classify loads according to their importance levels. The load classes are divided into four levels: VIP load class, first-class load, second-class load, and third-class load. The Early Warning System (EWS) is used to provide notifications stored on the battery. ATmega 328 will send battery voltage data to ESP32, which will then be sent through the Telegram application. The performance of the EWS in the load shedding system is reviewed in terms of its effectiveness. The object of this research is the automatic sending of load shedding warnings. Data on battery percentage was taken 20 times. When the battery voltage is 5% above the load class cutoff percentage, ATmega328 will send battery voltage data to ESP32. In the experimental results, it was found that when the percentages show 80%, 75%, 55%, 50%, 30%, 25%, and 5%, the EWS works by sending messages to users about which load class will soon be cut off.
ANALISIS EKONOMI SISTEM PLTMH DAN POMPA AIR SUNGAI YEH HA DI KABUPATEN KARANGASEM Leba, G. I. M.; Sukerayasa, I. W.; Ariastina, W. G.; Giriantari, I. A. D.; Kumara, I. N. S.
Jurnal SPEKTRUM Vol 11 No 1 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2024.v11.i01.p28

Abstract

Yeh Ha River in Ababi Village, Karangasem Regency, is a bathing spot utilized by locals for various purposes, fed by the Yeh Ha spring. Among its uses is filling a water tank with a capacity of 58.74 m3 to distribute water to 10 households. Initially, a waterwheel powered a mechanical pump without electricity. However, due to damage, a less efficient hydraulic ram pump replaced the waterwheel. The research aims to design a Microhydro Power Plant (PLTMH) and a water pump system. With these systems, it's expected to enhance the efficiency of filling the water tank and ensure project sustainability through economic analysis. Measurements indicate that Yeh Ha spring has a flow rate of 0.201 m3/s with a head of 4.6 m. Based on this, a crossflow turbine equipped with a centrifugal pump and variable frequency drive is chosen to meet the water needs of 12,277 people or 2,455 families. The investment for the PLTMH and water pump system is Rp3,191,330,505 with a project's economic life of 30 years. Feasibility analysis shows that the design is viable, with a positive net present value of Rp1,534,531,357 and Rp930,180,420 at discount rates of 10% and 12%, respectively. However, the benefit-cost ratio (BCR) is less than 1, at 0.48 and 0.29. The internal rate of return (IRR) is 17.6% and 15.5%, with a break-even point of 2,699,253 m3 sold, requiring a payback period of 9 years at a 10% discount rate and 10 years and 4 months at a 12% discount rate.
STUDI POTENSI DAN PERANCANGAN PLTS APUNG DI DANAU BATUR GUNA MENDUKUNG BALI CLEAN ENERGY Oswald Mangatur, Christian; Setiawan, I Nyoman; Satya Kumara, I Nyoman
Jurnal SPEKTRUM Vol 10 No 4 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i04.p37

Abstract

The province of Bali has a solar energy potential of 1,254 MW but has only utilized 3.7 MWp up to the year 2020. One of the factors contributing to the slow development of PV in Bali is the need for large land areas for the construction of large-scale PV system. One solution to address the limited land availability for large-scale PV is by utilizing bodies of water through the implementation of floating PV. Lake Batur is the largest lake in Bali and has the potential to serve as a location for floating PV. This research aims to determine the technical potential of floating PV and design a system for floating PV in Lake Batur. With reference to the Lake Batur utilization plan and regulations for the use of floating PV, Lake Batur has a technical potential for floating PV of 76.44 MWp. The design of floating PV in Lake Batur is created with three scenarios. All three scenarios for floating PV show performance ratios within the range of 75-85%. The floating PV system also demonstrates an improvement in performance when compared to ground-mounted PV systems.

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