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Emitor: Jurnal Teknik Elektro
Published by Universitas Muhammadiyah Surakarta
ISSN : 14118890     EISSN : 25414518     DOI : https://doi.org/10.23917/emitor
Core Subject : Engineering,
Engineering
Emitor: Jurnal Teknik Elektro merupakan jurnal ilmiah yang diterbitkan oleh Jurusan Teknik Elektro Fakultas Teknik Universitas Muhammadiyah Surakarta dengan tujuan sebagai media publikasi ilmiah di bidang ke-teknik elektro-an yang meliputi bidang Sistem Tenaga Listrik (STL), Sistem Isyarat dan Elektronika (SIE) yang meliputi Elektronika, Telekomunikasi, Komputasi, Kontrol, Instrumentasi, Elektronika Medis (biomedika) dan Sistem Komputer dan Informatika (SKI).
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 65 Documents
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Static Magnetic Field Meter Using Rotating Search Coil Method Rustamaji, Rustamaji; Sawitri, Kania
Emitor: Jurnal Teknik Elektro Vol 24, No 3: November 2024
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v24i3.6678

Abstract

Abstract Static magnetic fields always exist the environment around us; besides being useful there are also negative impacts on humans, therefore it is necessary to have a tool to measure static magnetic fields. The purpose of this research is to produce a static magnetic field meter that can measure weak magnetic field. In this research, the design and realization of a static magnetic field meter using rotating search coil method is carried out, including: search coil, instrumentation and calibration amplifier, and display. Based on the results of measurements and tests that have been carried out, a static magnetic field meter with a coil area A = m2 and the number of turns N = 14 at a certain angular frequency (ω), can detect and measure a fairly small static magnetic field density (B) from various sources, for stable conditions: in the laboratory without any source of magnetic field can detect B = 2.127 to 2.375 mT, and with magnetic source (circular can detect B = 7.422 to 8.194 mT, neodymium can detect B = 11.03 to 11.84 mT, and smartphone X can detect B = 10.37 to 11.78 mT). Overall the device can work to detect and measure weak static magnetic fields with good measurement stability as seen from the relationship curve between supply voltage and the DC motor rotation which is linear, and measurement sensitivity up to B = 2.127 mT.
Koi Fish Pond Monitoring System Using IoT Sukarno, Setyawan Ajie; Maulana, Gun Gun; Andrea, Ferdyan
Emitor: Jurnal Teknik Elektro Vol 24, No 3: November 2024
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v24i3.6732

Abstract

The process of collecting water parameter data for koi fish ponds is still done manually. Each parameter from the manually collected samples is tested one by one. This process is inefficient and can cause delays in decisionmaking for koi fish farmers. If the manual testing reveals results that exceed the ideal threshold, it can have a negative impact on the fish. To address this issue, a koi fish pond water parameter monitoring system was designed using an automated method based on the Internet of Things. The sensors used in this study include an ultrasonic sensor, turbidity sensor, Total Dissolved Solids (TDS) sensor, and pH sensor. Based on the test results, when the values of the turbidity and TDS sensors exceed the set parameter limits of 40 NTU and 400 PPM, respectively, the system will activate the draining pump until the water level reaches the lower limit (10 cm), after which the filling pump will activate until the upper water level limit (18 cm) is reached. If the pH sensor value is below the lower limit set in the parameter, the system will activate the alkaline liquid pump to neutralize the pH to a value of 7. Conversely, if the pH sensor value exceeds the upper limit set in the parameter, the system will activate the acidic liquid pump to neutralize the pH back to 7. This automatic draining and filling system will stop working when the turbidity, TDS, and water level values fall within the parameters set in Blynk. The system also maintains the pond's water level at the upper limit set in the parameters.
Monitoring The Temperature of The Immersion Freezing Process to Prediction and Analyzing Production Costs Mirroring Jewelry IHTIFAZHUDDIN, RAMDHANY; Sutarna, Nana; Wicakson, Britantyo
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.6499

Abstract

This research is motivated by problems at PT Sentral Kreasi Kencana in the immersion freezing process for jewelry production. This process is still carried out manually with a fixed time assumption of 45 minutes, which causes temperature uncertainty and difficulty in increasing production quantity. This has an impact on decreasing efficiency and increasing production costs per gram. The study aims to increase the efficiency of the immersion freezing process by implementing a sensor-based temperature monitoring system and production cost analysis. The methods used include developing a temperature monitoring system using the MLX90614 sensor, integration with Arduino Uno, and creating a graphical user interface (GUI) for real-time data analysis. The system developed consists of an MLX90614 infrared temperature sensor, an Arduino Uno microcontroller, a buzzer as an alarm, and a push-button for batch calculation. The GUI displays real-time temperature data, trend graphs, total batches, product weight, fixed costs, and cost/gram calculations. The results showed that the implementation of the temperature monitoring system increased the number of daily production batches by 50%, from 4 to 6 batches. The processing time was also reduced from 45 minutes to 30 minutes per batch. The optimum temperature of −7◦C was set as the reference point for the immersion freezing process. Production cost analysis showed a significant decrease in cost/gram from IDR 6,333.33 to IDR 2,638.89, far below the company’s standard cost of IDR 5,000.00 per gram. This system has proven effective for gold with a content of 34.0%, 67.1%, and 75.5%. The implementation of this technology has succeeded in increasing production efficiency, reducing the cost per gram, and increasing overall production capacity. This research provides a practical solution for optimizing the immersion freezing process in the jewelry industry, with the potential for wider application in other precision manufacturing sectors. 
Performance Analysis of Micro-Hydro Plants Using Crossflow Turbines at Varying Water Fall Heights Wardhany, Arum Kusuma; Monika, Dezetty; Ariansyah, Rafi; Lubis, Muhammad Rasyid; Arifin, Muhammad; Aji, A. Damar
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.7067

Abstract

Hydropower plants have limitations in scalability and location, as they require large water flows and complex infrastructure. One solution to overcome these drawbacks is portable hydroelectric power plants, which are more flexible and adaptable to variations in water level. Portable geothermal power plants allow the regulation of water fall height to optimise their performance, especially in remote areas that are not reached by conventional power grids. This research aims to develop the performance of portable geothermal power plants by utilising variations in water level to analyse the performance of the effect of water fall height on the performance of portable geothermal power plants with crossflow turbines. This research uses an experimental method, which involves collecting and analysing data from the height of (variation 1) and (variation 2) to determine the performance of the Pico Hydro Power Plant (PLTPh). The research was conducted at Mahogany Lake, University of Indonesia. The data collected includes measurements of voltage, current, power, and rotation speed of the turbine and generator at different altitude variations to determine the effect of water fall height on the performance of PLTPh with crossflow turbines. The results showed that the height of the water fall can affect the performance of the Pico Hydro Power Plant (PLTPh). At the height (variation 1), the power and output voltage generated are higher than the height (variation 2). In addition, the output voltage is also greater when the generator is operating without load. This difference shows that variations in altitude, flow speed and water discharge entering the turbine cross section greatly affect the rotation of the generator and the amount of electrical power generated by the PLTPh.
Grid Tie Inverter Connected to a Three-Phase Power Grid Using Photovoltaic Setiyono, S
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.7531

Abstract

Indonesia is a country located on the equator and has abundant solar energy resources, making it highly potential for developing solar power plants. Currently, national power generation relies heavily on coal and oil, which contributes to global warming, increases carbon emissions in the atmosphere, harms nature, and incurs high development costs. To minimize these negative impacts from conventional power plants, an effective solution is needed, one of which is utilizing solar energy. This research focuses on a photovoltaic electricity generator connected to a stand-alone electrical network, commonly known as a Grid Tie Inverter (GTI). The objective is to supply additional power to a three-phase grid system when the load demand increases. This GTI consists of several key components, including the SunPower SPR-315E-WHT-D 200Wp PV, a Boost Converter circuit, a three-arm three-phase inverter transistor unit, a filter circuit, and a PWM signal generator control system. The method used in this study involves developing a GTI simulation model for a three-wire power system using Matlab Simulink. The simulation results indicate that the output voltage waveform of the three-wire GTI closely resembles a sinusoidal wave, with a Total Harmonic Distortion (THD) of 2.47% and an additional power contribution of 250 W to the electrical network.
Performance Optimization of Air Cooler Using Peltier and SEPIC Converter as Temperature Control Muchammad Ruben Imawan; Rachma Prilian Eviningsih; Novie Ayub Windarko
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.7642

Abstract

Air cooler has an evaporative mode that is used to get a cooler temperature output than without using evaporative mode. The evaporative cooling process involves water that is cooled with an ice cube placed in a water tank on the air cooler, where the outside air entering the air cooler will be cooler when exposed to honeycomb that has been submerged in cold water from the water tank so that the air temperature released by the air cooler will be cooler. The process of cooling the air temperature of the air cooler uses an ice cube which when used for a long time, the temperature will start to rise again so that the air coming out of the air cooler will rise again and become less cold than before. The purpose of this research is to create a system to keep the water temperature in the air cooler tank stable so that the temperature of the air released will also be cooler. This research was conducted using simulations with MATLAB software. Based on the simulation data that has been obtained, it is found that the temperature can be stabilized at 25 ℃ by using the fuzzy logic control method. By using the 5x5 fuzzy control method, the temperature can reach 25℃ with a time of 0.389ms while with 7x7 fuzzy the temperature can stabilize at 25℃ with a time of 0.407ms. Based on the results of open loop test, the temperature will continue to decrease in the range of 21 ℃, this is because this test does not use fuzzy logic control so that the temperature can't be stable at 25 ℃.
Design and Implementation of a Visible Light-Based Pest Stinger System Wahab, Faisal; Maria Diamond, Ivana; Fredy Naa, Christian
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.8013

Abstract

The agricultural yield in Indonesia has been declining, partly due to shrinking farmland. To address this issue, urban farming has been developed as a solution. However, in urban farming, there is a problem where the leaves of vegetables are infested by insect pests, causing damage to the leaves. Therefore, pest control is necessary in the farming area. One alternative for controlling insect pests is by applying high-voltage electricity to the pests, which will kill them by electric shock with a voltage of around ±1 kV. A "Joule thief" circuit is designed to increase the input voltage below 9 volts to an output voltage of ±1 kV. There are also supporting components, such as a lamp that emits ultraviolet light, to attract the pests. A monitoring system is also designed to allow operators to know the environmental conditions of the vegetable farm, such as soil moisture, air humidity, light intensity, and notifications if the insect carcass container is full. During testing of the trap, there was an issue with the internet connection, so a backup circuit was made to keep the device running according to the schedule without an internet connection. This pest trap was tested for 5 days, and the number of trapped pests increased each day, leading to the conclusion that this device effectively traps pests.
Current Controller with FOPI Modification for VSI-based Active Power Filter Tyas Prasetyo, Antonius Doddy; Dery Elfando; Silalahi, Eva Magdalena
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.8522

Abstract

The integration of photovoltaic (PV) systems into the grid, combined with nonlinear loads and bidirectional power flows, significantly impacts grid voltage stability and total harmonic distortion (THD) in low-voltage distribution systems. This study proposes the application of an Active Power Filter (APF) to improve power quality (PQ) and mitigate harmonic distortion caused by nonlinear loads. Harmonic distortion from nonlinear loads poses a substantial risk of damaging electronic equipment and degrading overall power quality. The proposed APF utilizes a Fractional Order Proportional-Integral (FOPI) controller implemented through a Voltage Source Inverter (VSI). The effectiveness of the FOPI controller was evaluated through simulation and compared to a conventional PI controller. The results demonstrate that the FOPI-controlled system successfully reduces current THD to meet IEEE 519 standards (< 5%), highlighting the superior performance and robustness of the FOPI controller compared to traditional approaches.
Development of Location-Based Services in Smart Systems: A Literature Review Mhd. Hanafi; Firdaus
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.8540

Abstract

Location-Based Services (LBS) are technologies that utilize user location data to provide relevant location-based information. This study aims to examine various LBS applications in smart systems through a review of previous literature. LBS are applied in both outdoor and indoor environments. Outdoor LBS typically use Global Positioning System (GPS) technology for applications such as attendance systems, local business searches, transportation, and healthcare services. Meanwhile, indoor LBS use technologies like Pedestrian Dead Reckoning (PDR) and Simultaneous Localization and Mapping (SLAM) to navigate environments where GPS signals are obstructed. This study also identifies the use of hybrid systems that integrate both indoor and outdoor LBS to ensure consistent service. In addition, challenges related to accuracy, privacy, and energy efficiency in LBS applications across various sectors are discussed. The findings of this research highlight the significant potential of LBS in supporting smart systems while emphasizing the need for further research to address existing challenges, particularly in technology integration and privacy improvements. The implementation of hybrid systems combining indoor and outdoor technologies is expected to provide a more comprehensive solution for future development.
Data Adjustment for ARIMA Method to Investigate the Impact of Pandemic on Electricity Consumption Prediction in Indonesia Wijaya, I Gede Putu Oka Indra; Kristi, Meilinda Santa; Maharani, Nabila Sri; Raharjo, Jangkung
Emitor: Jurnal Teknik Elektro Vol 25, No 1: March 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i1.8676

Abstract

Indonesia's rapid population growth and industrial expansion have significantly increased electricity consumption over the past decades. However, the COVID-19 pandemic has had a profound impact on the energy sector, causing a sharp decline in electricity demand. This disruption not only altered electricity consumption patterns but also forced a downward revision of the national electricity consumption target by approximately 10% compared to the government's initial projection. Understanding these shifts is crucial for ensuring sustainable energy planning and policy development. This study aims to analyze the impact of the pandemic on electricity consumption and forecast electricity demand in Indonesia from 2021 to 2045 using the Autoregressive Integrated Moving Average (ARIMA) method. Two forecasting scenarios are examined: one incorporating data from 2020 and another excluding it. The results indicate that excluding the 2020 data yields a more realistic projection, estimating electricity consumption to reach 610,807.8 GWh by 2045. The predictive performance of the ARIMA model is validated with statistical metrics, achieving an RMSE of 2,807.25, MAE of 1,481.25, and MAPE of 5.47%, with an overall accuracy of approximately 94.53%. These findings demonstrate that the ARIMA method is a robust and reliable tool for long-term electricity demand forecasting in Indonesia. The insights gained from this study provide valuable guidance for policymakers and energy planners in designing resilient and adaptive strategies to accommodate future electricity demand while considering the impacts of unprecedented disruptions such as pandemics.

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