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INDONESIA
Jurnal Mahasiswa TEUB
Published by Universitas Brawijaya
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Articles 2,116 Documents
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PERFORMANCE COMPARISON OF DOUBLE-SWITCH CUK CONVERTER AND CUK CONVERTER Akbar, Alif Aulia; Hasanah, Rini Nur; Nurwati, Tri
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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The conversion of high voltage with continuous input and output is a crucial requirement for current applications such as electric vehicles and renewable energy. In this research, a converter is proposed based on the Cuk converter by modifying the components into two switches, three inductors, three diodes, and four capacitors. The duty cycle and pulse signals on both switches are the same. The circuit analysis process is carried out using the continuous conduction mode method, assuming eachcomponent is in an ideal state. The analysis is conducted in two modes: when the switch is on and when the switch is off. Simulation and circuit analysis are shown to convert an input voltage of 12 volts to 156 volts on the output side. Simulations are conducted to analyze the input voltage, input current, output voltage, output current, voltage on the capacitor, current on the inductor, and then compare the changes in duty cycle to the output voltage, changes in duty cycle to efficiency, changes in duty cycle to the voltage stress on the switch and diode, and voltage stress on the switch relative to voltage gain. The results of these comparisons indicate that this converter can provide higher efficiency and a wider voltage gain capability with lower voltage stress value. Keywords: Cuk Converter, Efficiency, Simulation, Voltage Stress
KARAKTERISTIK PENGUJIAN TEGANGAN TEMBUS BOLAK-BALIK MINYAK WIJEN DENGAN MENGGUNAKAN ELEKTRODA HOMOGEN DAN TIDAK HOMOGEN Haidar, Achmad; Dhofir, Moch.; Wibawa, Unggul
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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In the electric power transmission system from the generation to the consumers, a reliable system is needed. The transformer isone of the very important electrical components in this system. In high-voltage equipment, especially power transformers,insulation is essential to separate two or more high-voltage conductors. Transformer oil is one of the liquid insulating materialsthat serves as insulation and coolant in transformers. Failure of the insulation system in electrical equipment can result in abreakdown voltage that can occur in the liquid dielectric in the form of oil. Therefore, this research will describe the influenceof water content and electrode shape on the probability of breakdown voltage in the dielectric oil, specifically pure sesame oil,using an Alternating Current (AC) voltage source. The shape of the electrode will affect the distribution of the electric field inthe conductor within the power transformer. Non-uniform field distribution will increase the potential for breakdown voltage.The testing was conducted at the High Voltage and Application Laboratory, Department of Electrical Engineering, Faculty ofEngineering, Brawijaya University. The simulation of electric field distribution for each electrode shape was carried out usingFEMM 4.2 software. Purification through heating was done to reduce the water content in pure sesame oil. Electrical testing(breakdown voltage testing circuit) and physical testing (water content testing using the oven method) were conducted todetermine the feasibility of sesame oil as an insulator. The test results showed that the breakdown voltage value of pure sesameoil increased from 16.73 kV/2.5 mm to 38.54 kV/2.5 mm for plate-plate electrodes and from 14.03 kV/2.5 mm to 31.27 kV/2.5 mmfor needle-plate electrodes. Heating pure sesame oil at varying temperatures of 25-70°C for 15 minutes resulted in an increasein breakdown voltage, with the highest average at 70°C being 46.71 kV/2.5 mm for plate-plate electrodes and 38.46 kV/2.5 mmfor needle-plate electrodes. The uniformity of the electric field with plate-plate electrode shape was 1 or 100%, while for theneedle-plate electrode shape, it was 0.4785 or 47.85%. Keywords: Breakdown voltage, electric field, insulating oil, sesame oil, water content.
PENAMBAHAN PROTEKSI OVERCURRENT RELAY UNTUK MENINGKATKAN KEANDALAN PENYULANG JETIS PADA GI WLINGI Gymnastiar, Muhammad Ilham; Dhofir, Moch.; Hasanah, Rini Nur
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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The purpose of this study is to obtain the setting of the overcurrent relay (OCR) and the right coordination to protect the Jetis feeder network from 3-phase and 2-phase short-circuit current levels. The addition of OCR is also done on the Jetis Feeder to improve network reliability. To set OCR, it starts by calculating the 3-phase and 2-phase short-circuit currents in each protection zone based on the impedance of the equipment that supports each protection zone. The calculation of OCR settings uses the British BS-142 standard guideline with OCR working time using the IEC 60255-151:2009 standard with the OCR curve type standard inverse. ETAP software in the study was used to simulate short-circuit currents and also OCR work analysis. The output of the ETAP simulation is in the form of short-circuit current values for each protection zone and also the OCR working time curve of each protection zone. The result of this study is OCR resetting from the existing value that the OCR coordination condition of zone 1 and zone 2 is still overlapping. Therefore, OCR zone 1 and OCR zone 2 were reset with the TMS result in zone 1 being 0.4 and TMS zone 2 being 0.225. The trip time distance between zone 1 and zone 2 is 0.397s. The analysis of the addition of OCR in Zone 3 to improve reliability by sharing the load. The addition of OCR in zone 3 results in a TMS of 0.1. The trip time distance between zone 2 and zone 3 is 0.283s which is in accordance with the IEEE std 242-1986 standard for the working time limit between two relays is 0.2s-0.4s. Therefore, the delay time distance in zone 1, zone 2 and zone 3 relays has worked well according to existing protection guidelines. Keywords — Relay, Over Current Relay, time setting, current setting, Feeder, ETAP.
ANALISIS KINERJA VACUUM CIRCUIT BREAKER PADA SISI 13,8 kV PT PAITON OPERATION & MAINTENANCE INDONESIA (POMI) UNIT 3 Adityara, Farrel Billy; Dhofir, Moch.; Hasanah, Rini Nur; Siswandi, Wawan
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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This study aims to analyze the performance of the VCB based on the parameters in SPLN Standard No. 52-1 1983 and IEC 62271-100 and to determine the technical feasibility of the 13,8 kV VCB work at PT POMI Unit 3A is still feasible to operate or not. The VCB parameter test uses standards on each test with the parameters of insulation resistance, contact resistance, synchronous contact, and vacuum. This study was conducted by comparing the data of the test results in 2015 and 2021 with the standard values in each test. In the insulation resistance test results obtained at each measuring point, each phase has a value above 13,8 MΩ. The contact resistance test results of each phase obtained have a value below 22 μΩ. In the synchronous contact test, the results of calculating the delta time or the difference in working time when VCB Open and VCB Close have a value below 10 ms. The results of vacuum testing of each phase on the test equipment indicator show an indication of "GOOD" which means that the pressure in the VCB has a value below 10-7 mbar. Based on the test results of insulation resistance, contact resistance, synchronous contact, and vacuum, the VCB 13,8 kV PT POMI Unit 3A Incoming is in a suitable condition for use and can be operated because the test results according to standards. Keywords – Vacuum Circuit Breaker (VCB), Insulation Resistance, Contact Resistance, Synchronous Contact, Vacuum.
RANCANG BANGUN SISTEM MONITORING KUALITAS UDARA (PM2.5 DAN PM10) DI TAMAN SINGHA MERJOSARI BERBASIS INTERNET OF THINGS DENGAN METODE LOGIKA FUZZY Akmal, Muhammad Dhiyadin; Rusli, Moch.; Nurussa’adah, n/a
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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The air quality in Indonesia has become a serious concern due to the high levels of pollutants that endanger public health. In 2023, Indonesia ranked 14th as the most polluted country in the world and first in Southeast Asia. PM2.5 and PM10 particulates are the main pollutants having a significant impact. The average concentration of PM2.5 and PM10 in Indonesia reaches 7.4 times the WHO guidelines. The health impacts of these pollutants include irritation, headaches, asthma, heart disease, and lung cancer. With air pollutants posing a threat to public health, continuous monitoring is necessary to identify and measure air pollutant levels. Therefore, this study aims to design and develop an Internet of Things (IoT)-based air quality monitoring system using fuzzy logic in Taman Singha Merjosari, Malang. This system utilizes a PMS5003 sensor to measure PM2.5 and PM10 levels, an ESP32 as a microcontroller, and Blynk Cloud for monitoring. Fuzzy logic is used to process the data and produce air quality outputs. The research results show that the system can operate as designed, with the PMS5003 sensor having an accuracy of 98.69% for PM2.5 and 98.48% for PM10. The fuzzy logic system demonstrates an accuracy of 97.49%. Keywords: Air quality, Taman Singha Merjosari, PM2.5, PM10, fuzzy logic
PENGUJIAN TEGANGAN TEMBUS BOLAK BALIK PADA BAHAN ISOLASI MINYAK JARAK SEBAGAI ALTERNATIF MINYAK TRANSFORMATOR Syarifasa, Arkananta; Dhofir, Moch.; Utomo, Teguh
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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The use of vegetable oil, especially castor oil as liquid insulation, needs to be proven by testing the breakdown voltage anddielectric strength of the oil as liquid insulation to predetermined standards. The test is to determine the breakdown voltageresistance and suitability of castor oil as an alternative liquid insulation for transformer oil in accordance with SPLN (StateElectricity Company Standards) and IEC (International Electrotechnical Commission) standards. The research method in thisstudy is analysis and direct measurement of the variables tested, namely the effect of heating with temperature variations on the breakdown voltage of castor oil. Testing of heating temperature variations on oil shows that there is an increase in the breakdown voltage value of castor oil after being given a directly proportional variation in heating temperature and experiencing a quite significant increase in breakdown voltage.  Keywordrs : Castor oil, Breakdown Voltage, Moisture Content, Permittivity, Conductivity
ANALISIS SETTING RENEWABLE FRACTION PADA DESAIN PEMBANGKIT LISTRIK TENAGA HIBRID (BAYU-SURYA) - STUDI KASUS DI DESA NGIJO KABUPATEN MALANG Mardotillah, Nanda Azizah; Wibawa, Unggul; Hasanah, Rini Nur
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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Electrical energy is essential in modern life, with per capita electricity consumption in Indonesia continuing to rise as the economy and urbanization grow. While reflecting positive economic development, this also puts pressure on electricity infrastructure, demanding sustainable electricity generation alternatives. Indonesia has great potential for wind and solar energy, yetutilization is still limited. Ngijo Village in Malang Regency is an example of hybrid power plant implementation, but its success depends on settings such as Renewable Fraction (RF). This study evaluates the potential of renewable energy in Ngijo Village in 2023 using HOMER simulation. Data on solar radiation, wind speed, system component costs, and the number of families usingelectricity were used to determine the RF setting. Results show Ngijo Village has a large solar radiation potential, with the highest average of 6.26 kWh/m²/day, and wind speeds of 1-2 m/s. Higher RF increases production from the Hybrid Power Plant (PLTH) and decreases production from the public grid. RF also affects the economics of the plant, with net present cost and annualized cost increasing as RF increases, while cost of energy decrease. However, at 60% RF, the cost of energy increase again. Keywords: Setting Renewable Fraction, PLTH, Wind, Solar, HOMER, Ngijo Village
ANALISIS PENGGUNAAN BATERAI LITHIUM-ION SEBAGAI BATTERY BANK PADA STASIUN PENGISIAN SEPEDA LISTRIK Pratomo, Setyo Fajar; Maulana, Eka; Dhofir, Moch.
Jurnal Mahasiswa TEUB Vol. 12 No. 4 (2024)
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Lithium-ion is a battery with high-density energy and a lower self-discharge. Moreover, lithium-ion batteries have no memory effect. One of the most used lithium-ion cells is lithium-ion 18650. The Tesla electric cars (model S and X) produced in 2013-2017 consist of a total of 8,256 Panasonic NCR18650B cells which capable to store 100 kWh of power, enabled people to drive up to 482km. Apart from the excellence, the increasing use of lithium-ion batteries in electric vehicles and electronic devices will create a lot of waste when the lithium-ion batteries used are worn out. Hence, this study aims to examine the feasibility of used lithium-ion batteries and reuse them as energy storage at electric bike charging stations in parking lot. The system is designed with a 275WP solar panel to charge the bank battery through the PWM solar charge controller, followed by charging an electric bike battery with the inverter. The battery bank is constructed by 30 cells of 18650 lithium-ion batteries which have already gone through an voltage, capacity, and internal resistance sorting process. The configuration used is the 6 series 5 parallel with charge capacity of each cell is on 2091 – 2366 mAh, resulting in saved energy as much as 243 Wh. The experimental results prove that the designed battery bank can fulfill its function as energy storage in the solar panel system. The time required to charge the bank battery fromempty to full is five hours. Besides, the battery bank is able to provide power through an inverter in order to charge an electric bike battery using a 25.2V 2A adapter. Keywords: 18650 Battery, Electric Vehicle, Lithium-ion, Solar Panel, Charging Station.
PENGARUH BENDING PADA ANTENA MIKROSTRIP TERHADAP GAIN, DIRECTIVITY, DAN EFFICIENCY DENGAN ORIENTASI BENDING ARAH SUMBU Y Arifin, Muhammad Iqbal; Purnomo, Muhammad Fauzan Edy; Mustofa, Ali
Jurnal Mahasiswa TEUB Vol. 12 No. 5 (2024)
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Antennas must adapt to a time when wearable and flexible forms are necessary. The microstrip antenna may need to be bent for this purpose, which may modify its properties or specifications. In this study, a stair-like 27-star ground plane patch is used to create a microstrip antenna that operates at 2.4 GHz. CST Studio Suite 2019 software was used for design and simulation, while a signal generator and spectrum analyzer were used for measurements. The simulation findings demonstrate that bendinggenerates yield gradation in the gain, directivity, and efficiency characteristics of the microstrip antenna. The measurement results demonstrate that gain, directivity, and efficiency may be varied. The smaller the bending radius the more bent the antenna become, therefore the antenna will work differently. Keywords: Microstrip Antenna, Bending, Gain, Directivity, Efficiency
RANCANG BANGUN SISTEM MONITORING SUHU DAN KELEMBABAN PADA PERKEBUNAN KOPI DENGAN METODE WIRELESS SENSOR NETWORK (WSN) Mohammad, Akmal Rozan; Maulana, Eka; Nusantoro, Goegoes Dwi
Jurnal Mahasiswa TEUB Vol. 12 No. 5 (2024)
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As a developing country, Indonesia strives to become a developed nation through economic transformation, including increasedproductivity in the plantation sector, particularly coffee. Coffee plays a crucial role in Indonesia's economy, significantlycontributing to non-oil exports. In 2022, Indonesia became the third-largest coffee producer in the world. However, domestic coffee production still falls short of meeting the growing demands for consumption and export. Coffee plant growth is influenced by factors such as water availability and tree shade. Adequate rainfall is essential for optimal growth, affecting the temperature and humidity, which in turn impacts coffee production. High temperatures can cause flower drop and reducing yield. This study addresses these conditions by designing a monitoring system capable of detecting temperature and humidity in coffee plantations. Utilizing wireless sensor network (WSN) technology, this system is developed to monitor large areas and display the results in spreadsheets. The system comprises a DHT22 sensor for measuring air temperature and humidity, a YL69 sensor for soil moisture, and a LoRa SX1278 for long-range communication. The results indicate that the designed system operates effectively, providing accurate data with an error rate of 4.81% for the YL69 sensor, 0.87% for the DHT22 temperature measurements, and 1.04% for humidity measurements. The LoRa communication system has a maximum range of 360 meters. Keywords: Coffee, Temperature and Humidity, LoRa, WSN

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