Perkembangan teknologi dan mobilitas saat ini telah mendorong manusia untuk berinovasi dan menciptakan alat transportasi yang hemat energi, ramah lingkungan dan dapat mengurangi ketergantungan terhadap bahan bakar minyak yang sewaktu-waktu akan habis. Saat ini mulai bermunculan alat transportasi dengan menggunakan energi listrik sebagai sumber energi alternatif dari bahan bakar minyak diantaranya adalah sepeda listrik. Tujuan dari penelitian ini adalah untuk merancang, membuat, dan mengetahui cara kerja/sistem sepeda listrik dengan pemanfaatan generator, aki dan motor listrik sebagai sumber penggerak, kemudian untuk mengetahui besarnya daya yang keluar (output) dari generator tersebut dan mengetahui kecepatan putaran motor dengan beban yang berbeda-beda. Pada tugas akhir ini penulis berhasil merancang dan membuat sepeda listrik dengan sistem penggerak berupa Motor DC seri 24 Volt, 350 Watt, 14.4 Ampere, 3000 rpm. Sepeda listrik menggunakan Generator DC magnet permanent 24 Volt dengan daya yang dihasilkan 29 Watt untuk mengkonversi energi kinetik dari putaran roda sepeda menjadi energi listrik. Media penyimpanan energi listrik pada sepeda listrik ini menggunakan 4 buah aki dengan tegangan masing-masing 12 Volt – 7.1 Ah. Dari hasil pengujian sepeda listrik dan analisa data, didapatkan daya output untuk menggerakkan sepeda listrik dengan beban 80.6 = 316.6954 Watt, beban 85.6 kg = 303.7732 Watt, beban 90.6 kg = 294.5672 Watt. Kecepatan maksimum sepeda tanpa beban adalah 78.53 m/s. Kecepatan rata-rata sepeda dengan beban 80.6 kg = 5,68 m/s, Kecepatan sepeda dengan beban 85.6 kg = 5,13 m/s, Kecepatan sepeda dengan beban 90.6 kg = 4,70 m/s. Kata kunci: Sepeda listrik, Perancangan, Motor DC seri, Generator DC magnet permanent.
The aim of the study was to determine the amount of electrical energy generated from methane gas produced from the volume of waste. The research method is carried out by literature review and field surveys, as well as theoretical calculations. Data was collected at the Tempat Pembuangan Akhir (TPA) and Kendari City Sanitation Office, by meeting and interviewing people directly related to the landfill management process, communities in energy independent settlements, as well as in the municipal sanitation office. The results of the study revealed that the energy produced from the Tempat Pembuangan Akhit (TPA) Puuwatu in the daily average was 288,466.5332 kWh. The amount of electrical energy that has been utilized by the Pemukiman Mandiri Energi is 1,080 kWh. The untapped energy is 287,386.5332 kWh.
Tangki penampung bahan bakar minyak merupakan salah satu bagian dari Sistem Pengisian Bahan Bakar Umum (SPBU) yang biasanya di letakkan di dalam tanah. Tangki ini berfungsi sebagai tempat penyimpanan awal bahan bakar yang akan di salurkan kepada pelanggan. Saat ini pengukuran volume tangki pendam dilakukan secara manual dengan menggunakan stick gauge. Sehingga opertator atau pemilik SPBU akan memerlukan waktu pengukuran secara berkala untuk mengetahui kapasistas yang ada pada tangki pendam. Solusi yang dapat ditawarkan adalah dengan membuat sebuah sistem monitoring tangki pendam yang terintegrasi dengan dispenser SPBU. Hasil monitoring volume tangki pendam ditampilkan pada mesin dispenser. Sistem monitoring dibuat dengan memanfaatkan Programmable Logic Control (PLC) sebagai kontroler utama dan Human Machine Interface (HMI) sebagai antar muka sistem. Dari hasil pengujian yang dilakukan, sistem mampu bekerja dengan baik sesuai dengan apa yang diinginkan. Untuk pengembangan kedepannya sistem dilengkapi dengan komponen pendukung sehingga tercipta prototype SPBU.
A reliable electric power system must maintain its operation in stable conditions with the support of various protection system during normal operation or when a fault occurs. To minimize the frequency of blackouts in the system due to interference, transient conditions, or the increased load, this study simulated the load shedding scheme using under-frequency relays (UFR). The analysis was done in ETAP 12.6.0 software using the Transient Stability Analysis feature. In this simulation, discontinuation occurs in the CB (Circuit Breaker) generator which causes the generator to escape from the system in two conditions, namely Peak Load Time (PLT) and Off-Peak Load Time (OPLT). The study simulated scenarios where circuit breakers (CB) tripped due to a fault, which causing a power plant to be disconnected from the grid. The scenarios were simulated in two conditions, during the peak load and off-peak load. The results show that during the peak load, the simulated Load Shedding Scheme 1 to 3 was occurred on the frequency of 49.3918 Hz, 48.72 Hz, and 48.0195 Hz, respectively. The respective disconnected loads on Scheme 1 to 3 were 4.529 MW, 41.84MW, and 59,072 MW while the recovery times were 2.432 s, 0.081 s, and 0.626 s, respectively Meanwhile, in the off-peak load, the UFR tripped at the frequency of 49.3958 Hz, 48.5855 Hz, and 47.75 Hz, the disconnected loads were 3.652 MW, 30.627 MW, and 43.93 MW, and the recovery time were 2.934 s, 0.588 s, and 0.592 s for Load Shedding Scheme 1 to 3, respectively.
The increase in the number of patients who have tested positive for Covid-19 continues to increase very significantly from time to time and there is no certainty when this outbreak will end. Therefore, anticipatory and preventive steps are needed to overcome these problems. One of the efforts to prevent the spread of the Covid-19 virus is to regularly wash hands and use hand sanitizers. However, not everyone is able to prepare hand sanitizers and not all public places are provided with hand washing facilities and hand sanitizers, even if there are, special personnel (operators) are needed to spray sanitizer and check body temperature with a thermo gun from a very close distance, which of course is this. It is also very vulnerable to the transmission of Covid-19. The purpose of this activity is to design and manufacture and provide appropriate technology for hand sanitizers and body temperature detectors to break the chain of the spread of Covid-19. The method used in this activity is to design, manufacture and test automatic hand sanitizer dispensers and disseminate technology at the urban village office in Kendari City. This community service activity has succeeded in producing an automatic hand sanitizer product that is integrated with a body temperature detection system and this tool has been implemented in one of the Kelurahan offices in Kendari City.
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