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Jurnal Teknik Elektro
Published by Universitas Kristen Petra Surabaya
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Electrical & Electronics Engineering
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 8, No 1 (2008): MARET 2008" : 8 Documents clear
Pemodelan Matematis Beban Tersebar Sebagai Beban Terpusat pada Sistem Distribusi 20 kV untuk Studi Aliran Daya Gina, I Made; Nrartha, I Made Ari
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (79.45 KB) | DOI: 10.9744/jte.8.1.8-15

Abstract

Load flow study on distribution system sometime is not effective for radial power system, which have many distributed loads. This un-effectiveness caused by the bus model for distribution transformer is a load bus in a load flow study. A mathematical model for representing distributed load as lumped load is needed for reducing distributed loads. This research is subjected to make a distribution load model as lumped load by using mass center formula (TPM model) based on lumped load model, [5] Cheng and Shirmohammadi. This models are validated using MATPOWER ver. 3.0.0 load flow to compare model outputs and real condition outputs of distributed loads. Output variables of research is sending power (Ps), sending reactive power (Qs), voltage magnitude (Vr) and angle (r). Validation of these models use standard distribution system (SPLN) and implemented on Gunung Sari Feeder, Lombok. Results of research are TPM model has better than CS95 model. TPM model has error percentage : Ps 0.8780%, Qs 0.6860%, Vr 0.2782% and r 0.637375%. CS95 Model has error percentage: Ps 1.6222%, Qs 1.1843%, Vr 0.8080% and r 7,0762% on standar distribution system (SPLN). Implemented these models on Gunung Sari Feeder, TPM model also has better than CS95 Model. TPM model has error percentage: Ps 0.5155%, Qs 1.0417%, Vr 0% and r 2.0875%, CS95 model has error percentage: Ps 0.5155%, Qs 1.0417%, Vr 0.3566% and r 25.5249%. Abstract in Bahasa Indonesia: Studi Aliran daya pada sistem distribusi kadangkala tidak efektif untuk kasus sistem distribusi radial yang memiliki gardu distribusi cukup banyak. Ketidakefektifan ini disebabkan model bus untuk gardu distribusi merupakan bus beban dalam studi aliran daya. Diperlukan model matematis beban (gardu distribusi) tersebar sebagai beban terpusat untuk mengurangi gardu distribusi tersebar. Pada penelitian ini diusulkan pemodelan matematis beban terpusat menggunakan rumusan titik pusat massa (TPM) dengan acuan model beban terpusat, [5]Cheng dan Shirmohammadi. Model diuji dengan aliran daya MATPOWER versi 3.0.0. untuk validitas model diukur dengan % error (daya terkirim (Ps dan Qs), magnitude dan sudut tegangan terima) dengan kondisi real (beban tersebar). Sistem distribusi yang diacu adalah Sistem Distribusi Standar (SPLN) dan diimplemetasikan pada Penyulang Gunung Sari, Lombok. Hasil penelitian menunjukkan untuk berbagai konfigurasi sistem distribusi 20 kV SPLN, Model TPM lebih baik dari Model CS95 karena % errornya lebih kecil yaitu TPM Ps 0.8780%, Qs 0.6860%, Vr 0.2782% dan r 0.637375%. Model CS95 Ps 1.6222%, Qs 1.1843%, Vr 0.8080% dan r 7.0762%. Implemetasi pada Penyulang Gunung Sari, Model TPM juga juga lebih baik yaitu Ps 0.5155%, Qs 1.0417%, Vr 0% dan r 2.0875%. Model CS95 Ps 0.5155%, Qs 1.0417%, Vr 0.3566% dan r 25.5249%. Kata kunci : beban tersebar, beban terpusat, titik pusat massa, sistem distribusi 20 kV dan aliran daya
Aplikasi Metode Gradien Daya Reaktif dalam Pemisahan Kontribusi Harmonisa Konsumen dan Utilitas pada Point of Common Coupling (PCC) Setiadji, Julius Setiadji; Penangsang, Ontoseno; Rahmawatie, Henie Arief
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.738 KB) | DOI: 10.9744/jte.8.1.52-56

Abstract

Harmonic disturbance is a phenomenon in AC power system. In the beginning, harmonic was caused by saturated iron in transformer and electrical machine. But along expanding modern technology which marked with usage of component of semiconductor, harmonic problems also progressively increase. Harmonic source can be come from utility and customer sides, so that it is required to analyze the separation of harmonic contributions between utility and customer at the point of common coupling (PCC). Analysis result of the reactive power changes against time (∆Q/∆t) shows that the graphic tends to increase and by manual analysis, the result of ∆Q/∆t is 0.04, so it can be concluded that utility has the biggest harmonic contribution on PCC. Abstract in Bahasa Indonesia: Gangguan harmonisa merupakan suatu fenomena di sistem daya AC. Pada mulanya penyebab harmonisa adalah ketika inti besi trafo dan mesin listrik mengalami kondisi saturasi, tetapi seiring berkembangnya teknologi modern yang ditandai dengan penggunaan komponen semikonduktor, masalah harmonisa juga semakin meningkat. Sumber harmonisa dapat berasal dari utilitas maupun konsumen, sehingga perlu dilakukan analisa pemisahan kontribusi harmonisa antara utilitas dan konsumen di PCC. Dari hasil analisa melalui grafik perubahan daya reaktif terhadap waktu (∆Q/∆t) menunjukkan bahwa grafik cenderung naik selain itu dengan analisa ∆Q/∆t diperoleh angka 0,04 (∆Q/∆t >0) sehingga dapat disimpulkan bahwa utilitaslah yang mempunyai kontribusi harmonisa terbesar di PCC. Kata kunci: harmonisa, PCC
Leakage Current Assessment Using Correlation Coefficient and Principal Component Analysis on The Eight-Month Naturally Coastal Contaminated Outdoor Porcelain Insulator Waluyo, Waluyo; Pakpahan, Parouli M.; Suwarno, Suwarno; Djauhari, Maman A.
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.946 KB) | DOI: 10.9744/jte.8.1.16-23

Abstract

This manuscript presents the experimental results of eight months naturally coastal contaminated outdoor porcelain insulator. The conducted experiments were leakage current and applied high voltage measurements, in the hermetically sealed chamber, where temperature, humidity, pressure and applied voltage could be adjusted and measured simultaneously. The leakage current waveforms were analyzed using FFT and the relation to other parameters were analyzed using correlation coefficient and principal component analysis. On high humidity, the leakage current waveforms tended to approach pure sinusoides, and the amplitudes tended to rise. Based on the correlation coefficient, the relative humidity influenced to leakage current amplitudes and phase angle as 0.60 and -0.68 respectively. Whereas, using PCA, the humidity close to power factor, and the phase angle close to THD and applied voltage. However, the phase angle opposites to the humidity. The extracted for 2 and 3 components are 74.5% and 85.3% respectively.
Miniatur Loading Arm Dock-3 PT Badak NGL Bontang dengan Sistem Emergency Shut Down (ESD) Ferdinando, Hany; Wicaksono, Handy; Pangkong, Estevanus Kurniawan
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (789.152 KB) | DOI: 10.9744/jte.8.1.24-29

Abstract

Loading Arms in PT Badak NGL are used to distribute natural gas for shipping. The position of the ship cannot be fixed due to the wind, sea wave, stream flow, etc. If the distance is out of tolerance limit, then the Emergency Shut Down (ESD) system will be activated. ESD will release the part that is connected to the ship so that the whole distribution pipe is safe. The loading arms are controlled via Programmable Logic Controller (PLC) manually. The miniature of the loading arms is useful to train the new employees to operate them well. It is build with 1:10 ratio and controlled by PLC OMRON C200 HG. Several DC motors are used to move the arms while potentiometers are used as position sensors. The PLC will monitor whether the position is within tolerance limit or not. From the experiments, the ESD can be implemented with 16.48s for slewing motion and 16.5s for extension motion. Abstract in Bahasa Indonesia: Loading Arm di PT Badak NGL dipergunakan untuk menyalurkan gas alam ke kapal tanker. Posisi kapal tanker bisa jadi akan bergeser karena ombak, angin, arus laut, dll. Jika pergeseran posisi tersebut melewati batas toleransi yang diijinkan, maka sistem Emergency Shut Down (ESD) akan aktif. ESD akan melepaskan bagian valve yang melekat pada kapal sehingga pipa penyalur secara keseluruhan tidak tertarik oleh pergerakan kapal. Loading arm dikendalikan dengan PLC secara manual. Keberadaan miniatur ini akan menolong pekerja yang baru untuk mempelajari hal-hal yang mungkin pada pengoperasian Loading Arm tersebut. Miniatur dibuat dengan skala 1:10 dan dikendalikan oleh PLC OMRON C200HG. Sebagai penggerak dipergunakan motor DC. Potensiometer akan difungsikan sebagai sensor posisi sudut. PLC akan memonitor apakah sudut yang terbaca masih dalam batas toleransi atau tidak. Dari hasil pengujian, terlihat bahwa simulasi proses ESD dapat dijalankan dengan baik dengan waktu 16,48 detik untuk gerakan slewing dan 16,5 detik untuk gerakan ekstension. Kata kunci : Emergency shut down, PLC, loading arm
Disain dan Implementasi Modul Akuisisi Data sebagai Alternatif Modul DAQ LabVIEW Sugiarto, Indar; Thiang, Thiang; Siswanto, Timothy Joy
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (920.703 KB) | DOI: 10.9744/jte.8.1.30-37

Abstract

This paper describes about an alternative module of data acquisition system (DAS), which can be accessed by LabVIEW. The advantage of this DAS module is inexpensive and it has good performance as well as module used in industrial control system. This DAS module is controlled by ATmega64 AVR microcontroller, which will communicate with the LabVIEW by using bidirectional serial communication. This DAS module has 8-bit digital input, 8-bit digital output, 8 channel analog inputs, 2 channel analog outputs. Voltage levels of digital input are 0 – 5 V and 0 – 24 V. The digital output of this module is an open collector terminal with “low” level voltage of 0.276 V. Analog input of this DAS module has three ranges. They are 1 – 5 V with average error of 14.47 mV, 0 – 10 V with average error of 72.34 mV, and 4 – 20 mA with average error of 0.037 mA. Range of analog output of this module is 0 – 10 V with average error of 16.2 mV. This DAS module is not designed for applications that need high accuracy of time. Abstract in Bahasa Indonesia: Sebuah alternatif modul data acquisition system (DAS) yang bisa diakses menggunakan LabVIEW dipaparkan dalam paper ini. Keuntungan utama modul DAS ini adalah dapat dibuat dengan harga sangat terjangkau dan menghasilkan performa yang baik seperti yang biasa digunakan dalam sistem kontrol di industri. Modul DAS tersebut dikendalikan oleh sebuah mikrokontroler AVR ATmega64 yang akan berkomunikasi secara bidirectional dengan LabVIEW menggunakan metode komunikasi serial. Sistem ini dapat digunakan untuk mengakuisisi 8-bit digital input, 8-bit digital output, 8 kanal analog input dan juga 2 kanal analog output. Digital input dapat digunakan untuk tegangan 0-5V dan 0-24V. Digital output dibuat bersifat open collector dengan tegangan “low” sebesar 0,276V. Untuk analog input maupun analog output dari sistem ini mempunyai rata-rata error sebesar 14,47mV untuk rentang input 1-5V; 72,34mV untuk rentang input 0-10V; 0,037mA untuk rentang input 4-20mA dan 16,2mV untuk rentang output 0-10V. Sistem ini tidak dirancang untuk digunakan pada aplikasi yang membutuhkan ketelitian waktu yang tinggi. Kata kunci : sistem akuisisi data, mikrokontroler, AVR, LabVIEW, rangkaian pengkondisi sinyal, instrumentasi.
Perancangan SCADA Software dengan Wonderware InTouch Recipe Manager dan SQL Access Manager pada Simulator Proses Pencampuran Bahan Wicaksono, Handy; Lim, Resmana; Sutanto, William
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (599.197 KB) | DOI: 10.9744/jte.8.1.38-45

Abstract

Nowadays, many industries has applied automation system by using PLC (Programmable Logic Controller) and SCADA (Supervisory Control And Data Acquisition). Wonderware InTouch is a kind of SCADA software available. In order to organize data in recipe and database, Wonderware provides Recipe Manager and SQL Access Manager. In this research, the process of paper making will be used as an industrial case study. In order to describe the process, a simulator plant will be made. It connects to PLC Omron C200HG and a computer which installed with Wonderware InTouch. In SCADA software that has been made, user can choose, delete, and create new recipe which is contained material mixture composition. When the system is running, sensor datas will be stored in a database and it can be seen by user. Security , trend, and alarm features are available too in this program. Based on overall experiment results through SCADA program that connected to PLC and simulator mixing plant, it can be concluded that all features in the program can run well. Abstract in Bahasa Indonesia: Banyak industri yang sudah menggunakan sistem automasi dengan menggunakan PLC (Programmable Logic Controller) dan SCADA (Supervisory Control And Data Acquisition). Salah satu software untuk membuat program SCADA adalah Wonderware InTouch. Untuk mengelola data dalam bentuk recipe dan database, Wonderware InTouch mempunyai program-program tambahan yaitu Recipe Manager dan SQL Access Manager. Pada penelitian ini, akan digunakan proses pembuatan kertas sebagai contoh kasus yang terjadi di industri. Untuk itu akan dibuat simulator plant yang dihubungkan ke PLC Omron C200HG dan dari PLC dihubungkan ke komputer dengan software Wonderware InTouch. Pada program SCADA yang dibuat, pengguna dapat memilih, menghapus dan membuat resep baru yang berisi komposisi campuran bahan. Setelah sistem dijalankan, data – data sensor akan disimpan ke dalam database dan dapat dilihat oleh pengguna. Fitur keamanan, penggambaran data dalam bentuk grafik (trend), dan alarm juga ditambahkan pada program ini. Berdasarkan hasil pengujian secara keseluruhan terhadap program SCADA yang dihubungkan dengan PLC dan simulator mixing plant pada proses pembuatan kertas, maka dapat disimpulkan bahwa semua fitur berjalan dengan baik. Kata kunci : SCADA, wonderware inTouch, recipe manager, SQL access manager
NEURAL NETWORK BASED SYSTEM IDENTIFICATION OF AN AXIS OF CAR SUSPENSION SYSTEM Hanafi, Dirman; bin Rahmat, Mohd. Fua?ad
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (185.079 KB) | DOI: 10.9744/jte.8.1.1-7

Abstract

Neural networks system identification have been widely used for estimate the nonlinear model of system. In this paper, multilayer perceptron neural network is used for identifying the Nonlinear AutoRegressive with eXogenous input (NARX) model of a quarter car passive suspension system. Input output data are acquired by driving a car on a special road event. The networks structure is developed based on system model. The Networks learning algorithm is derived using Fisher?s scoring method. Then the Fisher information is given as a weighted covariance matrix of inputs and outputs the network hidden layer. Unitwise Fisher?s scoring method reduces to the algorithm in which each unit estimate its own weights by a weighted least square method. The results show that the method uses suitable for modeling a quarter car passive suspension systems.
Perancangan Kapasitor Jalan untuk Mengoperasikan Motor Induksi 3-Fasa pada Sistem Tenaga 1-Fasa Anthony, Zuriman
Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.863 KB) | DOI: 10.9744/jte.8.1.46-51

Abstract

The method in operation three- phase induction motor on one-phase power supply by using capacitor had developed in success. This method has good response to rotation, less inrush current and increase power factor correction. The characteristic of the motor usually depend on the place and amplitude of the run capacitor used to the motor. Because of that, the purpose of this research is to give us a new method to place and choice the capacitance of run capacitor in operating three-phase induction motor on one phase power supply. The induction motor used was 1,5 kW, 220/380V; /Y; 50 Hz; 6,2/3,6A; 1400 rpm; B class, 0.84 lag. The result show that, the motor can be operated by using of run capacitor 25,9 F on 95,14% of load rating, 1400 rpm, 0.99 leading power factor, and less current harmonic distortion. Abstract in Bahasa Indonesia: Metode pengoperasian motor induksi 3-fasa pada sistem tenaga listrik 1-fasa dengan menggunakan kapasitor telah berkembang dengan baik. Metode ini digunakan karena mempunyai respon kecepatan yang cepat pada motor, arus start yang kecil dan perbaikan faktor daya hingga mendekati satu. Karakteristik motor saat beroperasi tergantung dari letak dan nilai kapasitor jalan yang digunakan pada motor. Penelitian ini dimaksudkan untuk membuatkan metode baru dalam meletakkan dan memilih kapasitor jalan untuk mengoperasikan motor induksi 3-fasa pada sistem tenaga listrik 1-fasa. Data motor yang digunakan adalah motor induksi 3-fasa 1,5 kW; 220/380V; /Y; 50 Hz; 6,2/3,6A; 1400 rpm; kelas B; faktor daya 0.84 tertinggal. Hasil penelitian menunjukkan bahwa motor bekerja lebih baik dan lebih efisien jika kapasitor jalan diletakkan pada sisi kumparan dengan impedansi yang lebih besar. Motor dapat bekerja dengan menggunakan kapasitor 25,9 F pada beban 95,14%, kecepatan 1400 rpm, faktor daya 0,99 mendahului, dengan distorsi harmonik arus yang lebih rendah. Kata kunci: rangkaian kapasitor, nilai kapasitansi, daya semu pada motor (VA)

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