Jurnal Rekayasa Elektrika
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Pemantauan Pembangkit Listrik Tenaga Mikrohidro (PLTMH)
Get PDFThis research is motivated by electrical power shutting-down that frequently occurred in Riau province. Low electrical power supply as compared to the need causes lack of supply. Thus, new alternative electrical energy resource such as micro hydro is required. Micro hydro plant is an electrical power generators that uses water to rotate the turbine. This research designs a monitoring system for micro hydro plant. The monitored micro hydro plant employs water turbine that is constructed using bicycle pedal and a water pipe installed on the pedal . The pipe flows the water to energize the turbine. Turbine rotation will generate electricity. The amount of power resulted by generators depends on the number of turbine rotation. The power is used to turn on the lamp. Some sensors are used to monitor generator performance. Current, voltage, and rotation sensors are used to monitor the resulted current, voltage, the turbine rotation respectively. The output power is stored in the battery. The micro Arduino and the ethernet shield capture the monitored data and send it to the computers using Wi-Fi connection. Measurement results show that the output voltage produced by the generator is 10 Volts when the water volume is high. Finally, it is found that the micro hydro generator is able to supply 5 Watts to the load
Kapasitas Daya Pembangkit Listrik Tenaga Mikrohidro di Alue Dua Aceh Utara
Get PDFThe utilization of micro hydropower plant is intended for providing electricity at Alue Dua village in North Aceh. A problem associated with the implementation of the micro-hydropower plant in the village is that the water flowrate of the run-of-river is varied at 117 litres per second during the wet season and at 36 litres per second during the dry season. This variation affects the speed of the water turbine and the capacity of power generated by its generator. Therefore to stabilize the output power and voltage of the generator during the course of the year, this paper aims to regulate the intake water flowing into the water turbine by controlling the opening vent valve from 0% up to 100% and controlling the electrical load connected to the generator. The speed of the water turbine was measured using the tachometer. It was found that the generator can produce electricity at its rated power 40 kVA during the wet season by opening the valve at 100% and at 12 kVA with the opening valve at 30% during the dry season. Opening the vent valve at 100% during the dry season can drain the water within 12 minute
Pembangkit Gelombang Terprogram Menggunakan DDS AD9851 Berbasis Mikrokontroler 18F4550
Get PDFDirect Digital Synthesizer (DDS) applies a method to generate an analog waveform in a digital manner,which is formed by generating a digital signal that varies with time and converting it into analog form using adigital to analog device (DAC). IC AD9851 is an analog waveform generator to implement the DDS method, whichgenerates a frequency that can be changed according to the needs of its users. The digital signal is generated using aPIC 18F4550 microcontroller that has a full-speed USB 2.0 feature to interface with the computer via USB withoutthe need of special drivers to do the communication. Setting of the output frequency can be done via the keypad orbuttons programmed via computer. The test results are a wide range of frequency waves produced from 100 Hz to30 MHz in the form of a sine wave with an amplitude of 430 mV and a square wave with an amplitude of 4,125 V.Keywords: DDS, AD9851, PIC 18F4550, USB, function generato
Grounded Theory sebagai Metode Riset Realitas Tertambah di Museum Fatahillah
Get PDFAugmented Reality (AR) is part of the science of visual communication design/graphic design through theaddition of images on the real world with virtual information to enhance ones senses with the help of smart glasseswith three general characteristics: 1). The combination of real environment with virtual objects, 2). Interactivedisplay, 3). Display in 3D. Qualitative research methods and grounded theory approach in the real environmentin the area of Jakarta Fatahillah museum, discovered a new theory as a basis the idea that Visual PrototypingAugmented Reality technique with image manipulation-image nuanced Kota Tua as Jakarta Icon. The idea ofexploiting foreign tourists enriching way to learn more about Indonesia through social networking in a virtual worldstrategies to increase tourism
Analisa Unjuk Kerja Mobile Based Tranceiver Station untuk Kestabilan Infrastruktur Sistem Komunikasi Seluler
Get PDFThe stability of the telecommunications system infrastructure, particularly in the area experienceddisastrous, should be restored as soon as possible to recover communication services. One solution for the recovery isby implementing a mobile Base Transceiver Station (BTS), which can be installed easily. In this work, an analysis ofArrow type Combat mobile BTS is conducted in the area of Terbanggi Agung, Central Lampung. The performancemeasurement and data analysis are performed on the three sectors of the cell coverage. The Received Total WidebandPower (RTWP), Call Completion Success Rate-Packet Switched (CCSR-PS) and Call Completion Success RateCircuitSwitched(CCSR-CS) aretaken at regular intervals(perhourfor 24hours), based on the standard KeyPerformanceIndicator(KPI) ofthe International Telecommunication Union(ITU). The results showed that theaveragevalueofRTWPoneach sectoris105dB,while thevalueofCCSR-PSand CCSR-CS are above95%. Moreover, the measured value of RTWP are less than the standard, which is assumed due to interference from neighbour BTS uplink frequency, despite the possibility of interference was small. In overall, the RTWP values, the CCSR-PS and CCSR-CS meet the standards of the ITU-T Recommendation E.850.Keywords: mobile BTS, received total wideband power (RTWP), call completion success rate- packet switched (CCSRPS),call completion success rate-circuit switched (CCSR-CS
Evaluasi Kuat Medan Pemancar Radio FM Pada Frekuensi 98,5-103,6 MHz di Kota Banda Aceh
Get PDFRadio Siaran FM merupakan salah satu teknologi telekomunikasi yang digunakan untuk memberikan layanan informasi dan hiburan bagi masyarakat. Untuk menjangkau masyarakat pendengar sebagai konsumen yang ditargetkan, kualitas penerimaan siaran menjadi hal yang sangat krusial. Daya pancar dan propagasi dari pemancar dapat mempengaruhi teknis kualitas layanan pada penerima. Masalah kualitas ini menjadi obyek yang dikaji dan pendekatan yang dilakukan untuk mendapatkan hasil, dilakukan pengukuran lapangan dengan menggunakan instrumen spectrum analyzer dan ditambah GPS sebagai penentu keakuratan lokasi pengukuran. Lima radio pemcancar swasta di kota Banda Aceh yang beroperasi pada frekuensi kerja 98,5 MHz hingga 103,6 MHz menjadi obyek penelitian dan akan dievaluasi. Hasil pengukuran lapangan didapati bahwa semua stasiun radio FM yang dievaluasi memenuhi standar kuat medan minimum yang diperbolehkan (E) sesuai standar untuk kategori daerah rural, 54 dBV/m dan daerah urban, 66 dBV/m. Hasil lain juga tidak ditemukan interferensi frekuensi dan semua stasiun masih dalam batas toleransi deviasi frekuensi kerja yang diizinkan. Dengan demikian, lima pemcancar radio FM yang dievaluasi mempunyai kualitas yang baik dan layanan yang diberikan dapat dinikmati dengan baik oleh pendengar
EXIT (EXtrinsic Information Transfer) Chart Analysis for BCH (Bose-Chaudhuri- Hocquenghem) Codes
Get PDFBCH (Bose-Chaudhuri-Hocquenghem) codes areused extensively in numerous applications in order to achievereliable data transfer. In this paper, the parameters of BCHcodes are introduced and used to investigate its applications,characteristics and performance when employed as inner andouter code in decoding method. To evaluate the parameters,three types of BCH codes: (7,4,3), (15,11,3) and (31,26,3); areapplied. In addition, the implementation of BCJR (Bahl,Cocke, Jelinek and Raviv) algorithm is discussed by applyingAPP-SISO (a posteriori probabilities Soft Input SoftOutput) decoding for BCH codes. The proposed chemeemploying inner and outer decoding of BCH codes isanalyzed and compared by using EXIT characteristic of BCHdecoders. The channel capacity measurements for differentrates inner BCH codes are described by using BPSKmodulation over AWGN channel. Lastly, the BERperformances of BCH codes are observed for different types,in order to obtain better performance of BER plot indeed
Pemantau Lalu Lintas dengan Sensor LDR Berbasis Mikrokontroler ATmega16
Get PDFThis system was designed to monitor the condition of traffic by measuring the speed and density of vehicles on the road. This system uses Light Dependent Sensor (LDR) that can detect the vehicles when there is no light stimulus. Light Dependent Sensor is used as a switch in the circuit. When the light on the sensor is blocked, it provides a response to microcontroller to turn on and turn off the timer, and to run the counter. Theoretically, the condition of traffic flow, such as traffic jams, can be indicated on the vehicle speed and density. The speed and density data were processed by microcontroller using C programming for RISC AVR (Alf and Vegards RISC) processor. Timing data obtained from the timer and counter were computed by applying arithmetic process to describe the traffic condition. Kinematics theory was applied to find the speedy by multiplying the distance between the sensors which was determined when the vehicles passing the sensors. This system is able to detect congestion at a road if the speed is lower and the density is higher than the setup values
Rancang Bangun Pengendali Otomatik Ketinggian Fluida dan Temperatur Menggunakan Programmable Logic Controller (PLC)
Get PDFPLC (programmable logic controller), ialah kendalilogika terprogram yang merupakan suatu piranti elektronikyang dirancang untuk dapat beroperasi secara digital,dengan mengunakan memori sebagai media penyimpananinstruksi-instruksi internal untuk menjalankan fungsi-fungsilogika dan fungsi-fungsi lainnya, dengan cara memrogram.Penelitian ini merancang bangun suatu sistem pengendalianotomatik menggunakan PLC. PLC tersebut diprogramberdasarkan urutan-urutan proses yang telah ditentukandengan waktu tertentu, yang terdiri dari prosespencampuran fluida, proses pemanasan dan prosespengosongan tangki. Proses-proses tersebut diprogramkanpada PLC dengan metode desain program menggunakandiagram keadaan STD (state transition diagram). Untukmelihat kestabilan pada proses pengaturan level dantemperatur, dibuat suatu eksperimen pada masing-masingproses tersebut. Hasil eksperimen menunjukkan bahwa PLCdapat mengedalikan ketinggian fluida pada batas maksimumlevel rendah 5 cm dan tinggi 25 cm, dengan deferensial gapmasing-masing 2 cm. Sedangkan hasil eksperimentemperatur menunjukkan bahwa bahan campuran akanmencapai nilai set point 40oC dalam waktu 140 detik. Secaraumum, urutan-urutan proses tersebut dapat berjalan stabildengan waktu yang dibutuhkan sistem untuk menyelesaikansatu siklus adalah 3. 40 menit
Analisis Proteksi Relay Differensial Terhadap Gangguan Internal dan Ekternal Transformator Menggunakan PSCAD/EMTDC
Get PDFProteksi transformator berfungsi untuk memproteksi transformator apabila terjadi gangguan, sehingga transformator dapat terhindar dari kerusakan. Dalam paper ini akan dibahas tentang relay differensial yang digunakan untuk memproteksi transformator. Relay ini bekerja apabila terdapat perbedaan arus pada CT sisi primer dan sekunder di zona proteksi. Apabila gangguan terjadi di luar zona proteksi, relay tidak akan bekerja. Penelitian ini berupa simulasi dengan menggunakan perangkat lunak PSCAD/EMTDC versi 4.2. Data-data yang digunakan adalah data dari sistem WSCC 3 Machine 9 Bus Systems. Dalam simulasi ini akan dilihat unjuk kerja dan selektifitas relay differensial, nilai arus pada PMT, serta waktu trip relay differensial di zona proteksi (internal) maupun di luar zona proteksi (eksternal). Dari hasil simulasi menunjukkan bahwa pada saat terjadi gangguan internal, relay trip (pick-up) selama 0,15 detik, yaitu dari 0,22 detik sampai dengan 0,37 detik, sedangkan pada gangguan eksternal relay tidak trip (pick-up)