Xbee s2 pro module works at 2,4 Ghz using IEEE 802.15.4 standard and polarization are linear. There are many types of antennas that can be used, which one is the dipole antenna. The simulation model implemented in this study uses Ansoft HFSS 14.0 software. HFSS stands for high frequency structure simulator is a pioneer in the use of finite element method for electromagnetic wave simulators that implement tangential vector finite elements, adaptive meshing and Adaptive Lanczos-Pade Sweep (ALPS) technology. By using HFSS 14.0 simulation, the axial ratio value of 35.0359 dB that means linier polarization. For the value of s-parameter -21,1851 db and VSWR value approaches 1, that is 1.5195 db. The gain value obtained is 0.7469 dB, the gain value needs to be optimized by using a metamaterial to get a good gain.
This paper proposes method of series direct current (DC) arc fault protection using low cost microcontroller. Series DC arc fault occurs when gap between conductor or wire flows a current. Series DC arc fault can cause fire hazard if do not detected and protected. However, Series DC arc fault is difficult to detected using conventional protection. To detect series DC arc fault accurately using fast Fourier transform (FFT). FFT is used to transform signal in time domain to frequency domain. Series DC arc fault has different characteristic compared by normal current in frequency domain. Therefore, the proposed algorithm for protection of series DC arc fault based on magnitudes of the current in frequency domain. Hardware system is implemented by 100 V DC power supply and DC arc fault generator. Test result is conducted experimentally under varying of load current such as 2 A, 2.5 A, 3 A, 3.5 A, 4 A and 5 A. Experimental testing results show that Series DC arc fault protection has time for trip of 0.48 s, 0.26 s, 1.04 s, 0.68 s, 0.44 s and 0.48, respectively. The fastest time for trip is 0.26 s with current of 2.5 A. Therefore, the proposed algorithm for series DC arc fault protection can operate to trip accurately and have the good performance.
Motor induksi (atau motor asinkron), yang merupakan motor Arus Bolak-balik (AC) yang paling banyak digunakan di industri, selalu bergantung pada perbedaan kecil dalam kecepatan antara medan magnet stator yang berputar dan kecepatan poros rotor yang disebut untuk menginduksi arus rotor pada belitan rotor. Dengan demikian, motor induksi tidak dapat menghasilkan torsi pada kecepatan sinkron, di mana slip tidak lagi ada. Sebuah motor bila diizinkan, akan memberikan torsi hingga batas maksimumnya untuk memutar bebannya; terutama di bawah rotor yang terkunci atau berat beban peralatan yang dimuat. Nilai batas torsi maksimum berbeda untuk setiap motor induksi AC dan berbanding lurus tergantung pada karakteristik motor. Dalam beberapa kasus, seperti konveyor, mesin bubut bermotor, atau penggerak motor langsung, jika motor dibiarkan menjalankan torsi maksimum, itu dapat menyebabkan kerusakan permanen pada peralatan. Penelitian ini menyajikan desain sistem Variable Speed Drive (VSD) yang memiliki kemungkinan untuk mengukur kecepatan rotor dan mengendalikan torsi motor asinkron berada dalam batas torsi yang ditentukan.
Nowadays, the development of renewable energy resource technology is increase. There is a lot of research being done to find solutions to increasing energy needs while the energy resources are getting more and more of a concern. There are several types of energy plants with renewable power such as micro hydro, photo voltage, wave energy, footstep, and others. Foot step is a renewable energy resource that has only recently been glimpsed by the world. Therefore, the footstep will be applied on board the passenger ship. It is hoped that the use of this renewable energy source can replace the source of fuel energy to drive ship engines. In this researdh, piezoelectric was used as a energy resources. Piezoelectric will be placed on tiles, when the piezo is stepped on, there will be a voltage came out from piezo. Voltage from piezo will be colect and stored. Each piezoelectric produces a voltage that varies from 0.7 volts to 3.7 volts. If on an average, one piezoelectric can produce 2 volts. The size of the voltage issued by the piezo depends on the size of the pressure on the piezo.
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