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Journal of Electrical Technology UMY
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 25501186     EISSN : 25806823     DOI : 10.18196/jet
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Library & Information Science
The Journal of Electrical Technology UMY (JET-UMY) is a peer-reviewed journal that publishes original theoretical and applied papers on all aspects of Electrical, Electronics, and Computer Engineering.
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Articles 7 Documents
 1 
Search results for , issue "Vol 1, No 3 (2017)" : 7 Documents clear
Ovulation Time Calculation Software Based on Pascal Language Wisnu Kartika; Fariskha Novi Fauziah; Ahmad Syaifudin
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1319

Abstract

On this time, it is many used devices for all of activity. On the daily life like watching tv, listening a radio, cooking with a stove and heating the water. All of that now use an embedded system, a small computing devices. In this era, many marriage couple who marry on the young age but they don’t have much knowledge about marriage and ovulation. Ovulation is important for young marriage couple. Ovulation time is used for determine the time to us when we plan a time to have a baby. To determine the time for ovulation time using a method called ovulation method. Using this method we make a software. By using Delphi we can make a software which can calculate the time. It is very interesting.
Analytical Studies of the Excitation System of Synchronous Generator in Steam Power Plant Unit 3 and 4 at PJB UP Gresik Pamungkas, Rizky Catur; Mustar, Muhamad Yusvin; Syahputra, Ramadoni
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1320

Abstract

Generator or alternator is a device that has a function to convert or transformmechanic energy to electricity. Electricity conversion need process with givingstrengthening with excitation current to coil magnetic field that placed on sync generator. Excitation current that flows on magnetic field coil will cause magnetic flux. Generator sync on PLTU unit 3 and 4 PJB UP Gresik use excitation system with excitation static type, this type of excitation it uses carbon brush as a media to conduct excitation current, this excitation system use the output of sync generator. In reality this excitation current which exist on PLTU unit 3 and 4 have to should always be taken care so the system can operate normally and commonly the fault that happened is under excitation and over excitation so it can be prevent. Step taken to avoid damaging the generator sync that caused by excitation current, steps that have to be taken are understanding thecharacteristic of system excitation setting, anchor current, voltage generator, and loading. The value of loading is very affecting the value of excitation current that injected to generator, the purpose of this process of excitation current injection is to maintain the stability from sync generator voltage so that the condition is staying on its normal condition.
Customization of 433 MHz Antenna for an ISM Application using Meanderline Structure Surahmat, Indar
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1315

Abstract

Innovation on ISM devices has been an interensting trend in robotics application. Antenna as a wireless interfacing part in communication between the device and another requires a specific design to fit an available space in the device. This paperexplores a customized design of 433MHz antenna for an application of ISM devices.Antenna is designed by using meandeline structure theory. An antenna for the frequency has been simulated and fabricated. The design is implemented in 38mm x 110mm FR-4 PCB with thickness 1.6mm. The antenna has a maximum gain 1.1 dB and SWR 1.83 at the frequency.
Software Engineering to Develop Patterns for Accumulated Values of Accounting Transactions Sigit Widadi; Parwoto Parwoto
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1321

Abstract

Software for accounting information systems has its own peculiarities, because the transaction data is recorded in pairs over a period of time, must be traceable and can be seen again in the future at the time period desired by the user according to the accountability of financial information systems. This research presents a prototype development technique about inter-account configuration in the accounting structure and aims to provide technical assistance on how to develop a pattern of financial transaction information presentation on a double entry record system model using financial applications. Relational data set theory and concepts are used as a scientific explanation framework on how the correlation between accounts can be constructed mathematically so that the concepts can be understood by programmers when they develop software. The result of this study has been tested by applying to the financial applications in one of the microfinance institutions and it can work properly. The prototype development techniques of this research can be applied to the software development in the business field, such as services, manufacturing and trade byimplementing in the form of the software configuration system tools. furthermore, the financial application developers are expected to utilize this prototype development technique to produce more dynamic software as a financial data processor according to the accounting rules in the business organizations.
Implementation of Backpropagation Artificial Neural Network as a Forecasting System of Power Transformer Peak Load at Bumiayu Substation Febrian Dhimas Syahfitra; Ramadoni Syahputra; Karisma Trinanda Putra
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1316

Abstract

The National Electricity Company (PT PLN) should have an estimated peak load of the substation transformer in the future. This is useful to be able to achieve transformer capability and can be used as a first step to anticipate the possibility of replacement of a new transformer. This research presents a peak load forecasting system transformer1 and transformer2 in Bumiayu substation using Backpropagation Artificial Neural Network (ANN). This study includes the procedures for establishing a network model and manufacture forecasting system based GUI (Graphic User Interface) using MATLAB 2015a. The formation of the network model refers to input variables consisting of GRDP data, population data and historical data of peak load of transformer. In this research, a multilayer network model, which consists of 1 input layer, 2 hidden layers and 1 output layer, is used. The peak load forecasting of transformer1 produces 5.7593e-08 for training MSE and 5.3784e-04 for testing MSE. Meanwhile, forecasting the peak load transformer2 generated 3.3433e-08 for training MSE and 9,4710e-04 for testing MSE.
Modeling of Wind Power Plant with Doubly-Fed Induction Generator Syahputra, Ramadoni; Soesanti, Indah
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1317

Abstract

This paper presents the modeling and simulation of wind turbine driven by doubly-fed induction generator which feeds ac power to the distribution network. A stator flux oriented vector control is used for the variable speed doubly-fed induction generator operation. By controlling the generator excitation current the amplitude of the stator EMF is adjusted equal to the amplitude of the grid voltage. To set the generator frequency equal to the grid one, the turbine pitch angle controller accelerates the turbine/generator until it reaches the synchronous speed. The system is modeled and simulated in the Matlab Simulink environment in such a way that it can be suited for modeling of all types of induction generator configurations. The model makes use of rotor reference frame using dynamic vector approach for machine model. The system is also simulated when a fault occurs in 25 kV grid of distribution system. The results of a single line to ground fault and a symmetrical three-phase ground fault is analyzed. The results show that the wind energy conversion system can normally operate in fault conditions.
Cell Balancing On Three- Cell Lithium Polymer Batteries Connected In Series Erika Loniza; Johanes Andriano Situmorang; Adha Imam Cahyadi
Journal of Electrical Technology UMY Vol 1, No 3 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1318

Abstract

Electric vehicle becomes popular recently, particularly in Indonesia. One of the most important and crucial components in an electrical vehicle is the battery. BMS (Battery Management System) is a system to monitor and regulate the performance of the battery resulting in effective-efficient-durable performance. Usually, BMS is needed to prevent battery from system failure. One of the problems that normally happens in a multi-cell battery and causing system failure is voltage unbalance. In this study, the system is designed so it can monitor the voltage condition of the three battery’s cells in series circuit and manage to balances it. The process of balancing the value of the voltage at the battery cells is known as cell balancing. The method used in this study is by using passive shunt resistor balancing method. In this method, an electronic circuit is designed in order to balance the value of the voltage at the battery cells using resistors to remove excess voltage. The result shows that the electrical circuit is capable to balance the voltage of each cell. Moreover, the designed circuit is monitored by software so it can perform in flexible manner.

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