Claim Missing Document
Check
Articles

Found 2 Documents
Search

SISTEM TOMOGRAFI IMPEDANSI LISTRIK SEBAGAI SARANA UJI TAK RUSAK SEDERHANA Ain, Khusnul; Wibowo, R Arif; Sapuan, Imam; Kurniadi, Deddy
Jurnal Matematika Sains dan Teknologi Vol 13 No 1 (2012)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The research was to build the simple electrical impedance tomography system as a nondestructive test equipment. It was carried out experimentally by developing two instrument as main systems. They were phantom and alternating current source. Phantom was built from PVC in 25 cm diameter and 16 electrodes in 6 cm x 2,45 cm rectangle, in which electrodes are placed on the interior boundary of the phantom. The alternating current source was built based on OpAm LM4562. Scanning was conducted by injecting an electrical current through a pair of electrodes and measure the electrical potential between the electrodes by adjacent method collecting data. The output were 256 complete data. The data were reconstructed by Newton Raphson method. Analysis of the results was done visually by comparing between reconstruction image and the reference object. The results showed that the system could generate sufficient reconstruction image, therefore it is promising to be used as a nondestructive test instrument and as instructional tool to understand the basic principles and mechanisms of electrical impedance tomography system. Telah dilakukan penelitian rancang bangun sistem tomografi impedansi listrik sederhana sebagai sarana uji tak rusak. Penelitian ini dilakukan dengan cara membangun peralatan dan sistem instrumentasi yang diperlukan, yaitu phantom dan instrumen sumber arus bolak balik. Phantom terbuat dari silinder dari PVC yang memiliki diameter 25 cm dan tinggi 6 cm dengan 16 elektroda berbentuk persegi panjang dengan lebar 2,45 cm dan tinggi 6 cm yang terpasang pada permukaan dalam phantom. Sistem instrumen sumber arus listrik bolak-balik dibangun berbasis OpAm LM4562. Proses pemindaian dilakukan dengan cara menginjeksikan arus listrik pada sepasang elektroda dan mengukur potensial listrik antar elektroda dengan metode koleksi data berpasangan, sehingga diperoleh 256 data lengkap. Data hasil pemindaian kemudian direkonstruksi dengan metode Newton Raphson. Analisis hasil dilakukan secara visual dengan cara membandingkan antara citra rekonstruksi terhadap objek uji. Hasil penelitian menunjukkan bahwa sistem tomografi dapat menghasilkan citra rekonstruksi yang cukup baik sehingga menjanjikan untuk digunakan sebagai media uji tak rusak dan digunakan sebagai media pembelajaran dalam rangka memahami prinsip dasar dan mekanisme sistem tomografi impedansi listrik.
Performance Analysis of Energy Storage in Smart Microgrid Based on Historical Data of Individual Battery Temperature and Voltage Changes Haq, Irsyad Nashirul; Kurniadi, Deddy; Leksono, Edi; Yuliarto, Brian; Soelami, F.X. Nugroho
Journal of Engineering and Technological Sciences Vol 51, No 2 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (983.722 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.2.1

Abstract

In this work, a historical data based battery management system (BMS) was successfully developed and implemented using an embedded system for condition monitoring of a battery energy storage system in a smart microgrid. The performance was assessed for 28 days of operating time with a one-minute sampling time. The historical data showed that the maximum temperature increment and the maximum temperature difference between the batteries were 4.5 °C and 2.8 °C. One of the batteries had a high voltage rate of change, i.e. above 3.0 V/min, and its temperature rate of change was very sensitive, even at low voltage rate of changes. This phenomenon tends to indicate problems that may deplete the battery energy storage system’s total capacity. The primary findings of this study are that the voltage and temperature rates of change of individual batteries in real operating conditions can be used to diagnose and foresee imminent failure, and in the event of a failure occurring the root cause of the problem can be found by using the historical data based BMS. To ensure further safety and reliability of acceptable practical operating conditions, rate of change limits are proposed based on battery characteristics for temperatures below 0.5 °C/min and voltages below 3.0 V/min.