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PENERAPAN SISTEM KONTROL UMPAN BALIK PADA UNDERWATER ROBOT UNTUK INSPEKSI KETEBALAN MATERIAL DI BAWAH LAUT (STUDI KASUS DI PT BADAK NGL)
Get PDFThis research aims to develop a Remotely Operated Vehicle (ROV) to support industrial activities, particularly underwater inspections. The ROV is designed to measure material thickness using an ultrasonic thickness gauge (UTG) and provide real-time visualization of equipment conditions through an underwater camera. Conducted at PT Badak NGL, the research involved several stages, including mechanical design using Autodesk Fusion 360, integration of electronic systems, and implementation of a control system based on the Chasing GO2 application. Testing demonstrated the ROV's optimal performance in water resistance, movement stability with five brushless motors, and the accuracy of the UTG in both air and underwater conditions. The ROV can dive up to 1.5 meters and deliver high-quality data for further analysis. Its integrated 1080p-resolution camera ensures clear visual outputs. Compared to conventional methods using divers, this innovation provides a more efficient, safe, and cost-effective solution for underwater inspections. The ROV becomes a strategic tool in enhancing the reliability of underwater industrial equipment operations while minimizing safety risks faced by divers.
Keywords: Control System, Real-time Visualization, ROV, Ultrasonic Thickness Gauge, Underwater Inspection
Rancang Bangun Pembangkit Listrik Tenaga Picohydro Menggunakan Turbin Double Archimedes Screw
Get PDFIndonesia memiliki potensi air yang begitu besar yang dapat dimanfaatkan sebagai pembangkit listrik. Salah satu pembangkit listrik yang memanfaatkan energi air yaitu Pembangkit Listrik Tenaga Picohidro (PLTPH) yang prinsip kerjanya mengkonversi energi air menjadi energi listrik. Penelitian ini dilakukan bertujuan untuk merancang PLTPH dengan menggunakan turbin Archimedes Double Screw dan mengetahui performa dari turbin archimedes screw dan archimedes double screw pada saluran irigasi. Metode yang digunakan yaitu studi literatur dengan mengumpulkan berbagai data mengenai turbin archimedes screw pada pembangkit listrik berskala kecil untuk memudahkan dalam merancang turbin achimedes double screw.Beberapa parameter yang perlu diperhatikan sebelum merancang PLTPH dengan menggunakan Turbin Archimedes Double Screw yaitu: debit, kecepatan aliran, daya potensial air, diameter turbin, diameter poros, pitch turbin, panjang turbin, jumlah ulir, dan kapasitas generator. Setelah merencanakan desain turbin,dilakukan perakitan turbin dan pengujian pada turbin untuk mengetahui performa dari turbin archimedes double screw. Hasil pengujian Turbin Archimedes single screw didapatkan nilai daya turbin tertinggi yaitu 124,286 Watt dengan tingkat efisiensi sebesar 61,62% pada pembebanan massa 8 kg sedangkan untuk pengujian Turbin Archimedes double screw didapatkan nilai daya turbin tertinggi yaitu 272,346 Watt dengan tingkat efisiensi sebesar 67,52% pada pembebanan massa 20 kg. Pada percobaan Turbin Archimedes single screw dikopel generator menghasilkan tegangan open circuit sebesar 24,2 V dengan daya tertinggi yang dihasilkan ketika melayani beban lampu yaitu 5,72 Watt dengan beban 13 lampu 10 Watt sedangkan Turbin Archimedes double screw dikopel generator menghasilkan tegangan open circuit sebesar 23,3 V dengan daya tertinggi yang dihasilkan ketika melayani beban lampu yaitu 34,61 Watt dengan beban 13 lampu 10 Watt. Berdasarkan hasil penelitian yang dilakukan, maka dapat dilihat bahwa performa Turbin Archimedes double screw lebih baik dibandingkan Turbin Archimedes single screw jika dibandingkan dari segi efisiensi dan daya yang dihasilkan
MEDIUM VOLTAGE INSULATOR CRACK DETECTION USING MOBILENetV2 AND TENSORFLOW
Get PDFThis study discusses the detection of medium voltage insulator cracks using object detection technology. This study uses medium voltage ceramic insulator image data at the ULP Daya Waste Material Warehouse. Ceramic insulator image data is categorized into good and damaged conditions. Preprocessing involves labeling, dividing train data, validation, and testing, and exporting data to Pascal VOC format. MobileNetV2 is implemented on Google Collab to train the object detection model. The evaluation of the model accuracy is in the COCO matrix, while the performance graph shows that the model can read objects well because the reading curve is in line with the smooth curve. Furthermore, this model is applied in creating an Android application that uses the device's camera to detect objects in real-time. This application processes images, converts from YUV to RGB, and performs object detection using the trained model. The detection results are displayed with bounding boxes and labels on the camera reviewer, namely the good class with a reading value of 1.0, the damaged class with a reading value of 0.67 and the background 1.0. This application also tracks detected objects and updates the display according to the detection results
Peramalan Beban Listrik Menggunakan Metode Jaringan Syaraf Tiruan di PT.PLN (Persero) ULP Maros
Get PDFThe amount of electricity consumption over time tends to increase, the amount of which cannot be determined with certainty. If this uncertainty is not expected, it will become a problem, because electricity demand is increasing but electricity supply is lacking. This research was conducted to forecast and predict the growth rate of electricity loads in the Maros ULP work area in 2023-2032 using artificial neural network methods and the MATLAB R2015a application. The data used is population, number of customers, and consumption of electrical energy used. Based on the results of this research, it was found that household use experienced a growth of 9% per year, public use experienced a growth of 5% per year, and industrial use experienced a growth of 1% per year. Based on forecasting results using this method, it shows that there will be an increase in the electricity load in the ULP Maros working area from 2023-2032, experiencing a significant increase each year for household and public use, however, for industrial use the increase is quite slow each year.Besarnya konsumsi listrik dari waktu ke waktu cenderung mengalami peningkatan yang besarnya tidak dapat ditentukan secara pasti. Ketidakpastian itu apabila tidak diperkirakan akan menjadi sebuah masalah, karena kebutuhan listrik semakin bertambah tetapi penyediaan listrik kurang. Penelitian ini dilakukan untuk peramalan dan memprediksi laju pertumbuhan beban listrik di wilayah kerja ULP Maros tahun 2023-2032 dengan menggunakan metode jaringan syaraf tiruan serta menggunakan aplikasi MATLAB R2015a. Adapun data yang digunakan adalah jumlah penduduk, jumlah pelanggan, dan komsumsi energi listrik yang terpakai. Berdasarkan hasil penelitian ini didapatkan pada peruntukan rumah tangga mengalami pertumbuhan sebesar 9% pertahun, untuk peruntukan publik mengalami pertumbuhan sebesar 5% pertahun dan untuk peruntukan industri mengalami pertumbuhan sebesar 1% pertahun. Berdasarkan hasil peramalan dengan menggunakan metode tersebut menunjukkan terjadi peningkatan beban listrik di wilayah kerja ULP Maros dari tahun 2023-2032 mengalami peningkatan yang signifikan tiap tahunnya pada peruntukan rumah tangga dan publik, akan tetapi pada peruntukan industri mengalami peningkatan yang cukup lambat tiap tahunnya
Integration of On-Grid Solar Photovoltaic Systems for Electric Motorcycle Battery Swap Stations
Get PDFThis study presents the design and feasibility analysis of an on grid Solar Power System (SPS) based electric motorcycle battery swapping station at PT Indomarco Prismatama Tbk Makassar. The objective is to design a battery swapping station integrated with an on grid SPS and to analyze its technical, economic, and environmental feasibility. The methodology includes theoretical analysis and simulations conducted using PVSyst software. The results show that the proposed SPS has a capacity of 4.8 kWp, utilizing twelve 400 Wp monocrystalline solar panels configured in two parallel strings of six series connected panels, one 5 kW inverter unit, and a 12 slot battery swap cabinet. The annual energy production is estimated at 7,884 kWh based on numerical calculations and 7,670 kWh based on PVSyst simulations. The economic analysis yields a positive Net Present Value (NPV) of up to Rp 104,891,580, an Internal Rate of Return (IRR) of 14.79 percent, a Profitability Index (PI) of 3.0, and a Discounted Payback Period of 8 years and 1 month. Based on these results, the on grid SPS based battery swapping station is found to be technically, economically, and environmentally feasible, and it has the potential to support more efficient and sustainable logistics operations at PT Indomarco Prismatama Tbk
COMPREHENSIVE POWER QUALITY ASSESSMENT IN RADIAL DISTRIBUTION SYSTEMS: A HARMONIC-AWARE NCPI COLLAPSE PREDICTION INDEX-BASED HARMONIC IMPACT ANALYSIS
Get PDFThe proliferation of non-linear loads in modern distribution systems has necessitated a comprehensive understanding of harmonic distortion effects on system stability and collapse prediction metrics. This study presents a novel analytical framework employing the Novel Collapse Prediction Index (NCPI) to quantify harmonic impacts on voltage stability in radial distribution networks. Utilizing the IEEE 33-bus test system as a benchmark, we developed an integrated methodology that incorporates Total Harmonic Distortion in voltage (THDv) and current (THDi) into the classical NCPI formulation. The proposed approach extends the conventional collapse prediction analysis by introducing harmonic correction factors that explicitly account for voltage and current distortions in stability assessment. Our analysis reveals that harmonic distortion can increase NCPI values by 0.5-1.8%, indicating reduced stability margins, with more pronounced effects in heavily loaded branches distant from the source. The study establishes critical thresholds for harmonic-induced stability degradation, providing quantitative evidence that THDi > 15% and THDv > 3% significantly compromise voltage stability margins. Through comprehensive correlation analysis, we demonstrate strong interdependencies between harmonic content, voltage regulation, and collapse prediction indices, with harmonic distortion contributing to measurable reduction in system stability margins. The findings offer practical insights for power system engineers and regulators, facilitating evidence-based decision-making for harmonic mitigation strategies focused on preserving voltage stability in contemporary distribution networks
OPTIMIZATION OF SLACK BUS PLACEMENT DURING PEAK LOAD BY CONSIDERING THE VOLTAGE PROFILE OF THE GENERATION BUS IN THE SULSELRABAR ELECTRICITY SYSTEM
Get PDFThis study was carried out to determine the best slack bus placement during peak loads by considering the voltage profile of the generator buses in the South Sulawesi electricity system. Analysis was performed to determine the optimal slack bus placement and its impact on the bus voltage profile. South Sulawesi's electric power system is made up of 29 power-generating units, including PLTA, PLTU, PLTG, PLTGU, PLTMH, PLTD, and PLTB, that operate at a voltage of 150 kV. In addition, 56 substations are linked via a 150 kV transmission network. This study relies on daily operational data from the South Sulawesi system at peak load on September 16, 2022. Using Matlab's Newton-Raphson method to simulate power flow, five scenarios are used to alternately change the generator bus (PV bus) into a slack bus; the generators are PLTA Bakaru, Punagaya PLTU, Jeneponto PLTU, Sengkang PLTU, and Poso PLTA. After running simulations for each generator, it was discovered that Poso PLTA had the voltage profile closest to the standard set by the Minister of Energy and Mineral Resources Regulation number 20 of 2020, which ranges between 0.90 and 1.05 pu. In comparison to the other four slack buses, it had the lowest total power loss of 120,743 MW and 593,764 MW MVAR
PENGEMBANGAN SISTEM KONTROL DAN PENEPAT MESIN CNC SPOT WELDING UNTUK PERAKITAN BATTERY PACK
Get PDFDi Indonesia, hingga saat ini proses perakitan dan produksi battery pack masih menggunakan cara manual dan semi otomatis. Perakitan manual selalu menggunakan kabel yang disolder di antara setiap bagian baterai. Sedangkan proses perakitan semi otomatis menggunakan alat titik bergerak otomatis. Namun pemindahan benda kerja (baterai) pada proses pengelasan titik (Spot Welding) masih dilakukan secara manual. Mesin CNC Spot Welding ini sebelumnya diproduksi dan dioperasikan oleh beberapapihak. Setelah beberapa kali proses pengoperasian terdapat kekurangan yang dapat diperbaikiPenelitian ini bertujuan adalah untuk pengembangan konstruksi mesin CNC Spot Welding yang mudah dipindahkan, untuk sistem kontrol dan penepat yang dapat memudahkan pengoperasian mesin CNC Spot Welding, untuk menganalisis hasil pengujian pengelasan pada mesin CNC Spot Welding, dan untuk mengetahui estimasi biaya manufaktur mesin CNC Spot Welding. Penelitian ini dimulai dari studi literatur, identifikasi masalah, perancangan, pemilihan dan pembuatan komponen, pengecekan fungsi dan kesesuaian komponen, perakitan sistem mekanik elektrik dan sistem kontrol, pengujian dan pengambilan data, serta analisa data. Penelitian dilakukan dengan pemilihan tempat dan waktu, alat dan bahan, tahapan perancangan, dan prosedur pengujian. Metode pengambilan data dilakukan dengan menggunakan mistar ingsut dan balok aluminium untuk menguji keakuratan pergerakan. Dari hasil penelitian ini Telah dihasilkan produk CNC Spot Welding dengan spesifikasi yaitu meja 1200 mm x 600 mm x 743 mm, control box 450 mm x 260 mm x 160 mm, cover mesin 580 mm x 560 mm x 500mm. Sehingga produk hasil pengembangan ini dapat dengan mudah dipindahkan. Telah dibuat dan dikembangkan Mesin CNC Spot Welding yang mudah dioperasikan dan proses kalibrasi mesin sumbu-X, sumbu-Y, sumbu-Z menunjukkan tidak terdapat backlash dengan maksimal toleransi +-0,02, sehingga sumbu-X, sumbu-Y, dan sumbu-Z dapat digunakan. Berdasarkan beberapa pengujian menunjukkan mesin mudah dipindahkan dan hasil uji pengelasan dari pengembangan mesin CNC Spot Welding dengan lima kali percobaan dan menggunakan dua mode yaitu mode-8 dan mode-9 menghasilkan kualitas pengelasan yang bagus dengan waktu pengelasan selama 1 menit 7 detik yang terlihat padatampilan utama software Universal G-Code Sender. Dari hasil pengembangan mesin CNC Spot Welding untuk baterai pack diperoleh total harga produk untuk biaya bahan Langsung, biaya tenaga kerja, dan biaya bahan tidak langsung senilai Rp 10.123.232.Kata kunci: CNC, Spot Welding, Battery Pack, Universal G-Code Sender
Analysis of Energy Loss of Distribution Network of PT. PLN (Persero) ULP Banda Aceh
Get PDFThe aim of this research to identify areas requiring further attention to enhance electricity distribution efficiency. Data collection is conducted through observation and documentation methods to obtain secondary data such as Single Line Diagram, Distribution Transformer Load Current, Substation Voltage, Conductor Type, Conductor Length, and Conductor Cross-Sectional Area. Secondary data is processed and analyzed to obtain the conductor resistance value, conductor/line power losses, transformer power losses, total power losses, and total energi losses occurring in the distribution network using mathematical calculations, followed by simulation using the ETAP (Electrical Transient Analysis Program) application. After manually calculating power losses in the PT. PLN (Persero) ULP Banda distribution network at Penyulang Nusantara, which reached 7.84034 kW, the simulation results using the ETAP software show 7.8 kW, with a power loss percentage of 0.69% relative to the load. Following the simulation of improvement efforts using ETAP (conductor uprating and load balancing), power losses decrease to 4.4 kW (a reduction of 3.4 kW), with a percentage of 0.39%. The energi losses before improvement are 5,645.045 kWh (1.802%), and after improvement, it becomes 3,168 kWh (a reduction of 2,477 kWh) with a percentage of 1.59%. The improvement efforts result in savings of IDR 3,578,586.91
Calling Your Name: Sebuah Metode Penggunaan Papan Nama Sebagai Dorongan Motivasi Belajar dan Refleksi Diri: [Penelitian Tindakan Kelas Mata Kuliah Komunikasi Bisnis dan Ilmu Administrasi Bisnis]
Get PDFThis article describes action research in the form of the use of nametags that trigger students' motivation and their self-awareness in the classroom. The study was conducted by identifying classes through two stages of the PDAC cycle and also by conducting direct observations, interviews and questionnaires with fifty nine students in the communication classes at Business Administration Study Program PNUP. The results showed that by using nametags in the class, students felt more enthusiastic, more valued as individuals, willing to contribute more, figured-out their strength and weakness during class interactive session, and self-reflect on the learning process. The research aims to provide alternative solution regarding class action to be more productive and adaptive to student characters in which coherent with the UN Sustainable Development Goals number 4 quality of education and number 12 collaboration to achieve goals