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All Journal Perfecting a Video Game with Game Metrics Journal of Engineering and Technological Sciences JURNAL NASIONAL TEKNIK ELEKTRO Indonesian Journal of Electrical Engineering and Computer Science Jurnal Rekayasa elektrika

Eka Putra Waldi

Andalas University

Author-ID : 2454906

Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Removal of Microorganisms in Drinking Water using Pulsed High Voltage Hazmi, Ariadi; Desmiarti, Reni; Waldi, Eka Putra; Darwison, D.
Journal of Engineering and Technological Sciences Vol 45, No 1 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

A pulsed high voltage was used to remove microorganisms in drinking water. The effects of the pulsed high voltage on pH, conductivity, temperature and oxidation reduction potential (ORP) of the drinking water were investigated. The observed results show that the removal efficiency with respect to fecal coliforms and total coliforms increased with the increase of the pulsed high voltage. The removal efficiency for microorganisms such as fecal coliforms and total coliforms was in the range 25-100% and 44-100%, respectively, after the water was exposed to a pulsed high voltage of 5-10 kV for 60 minutes. An increase of the pulsed high voltage caused a decrease in the conductivity and ORP with operational time.

Preliminary Study on Treatment of Palm Oil Mill Effluent (POME) by Sand Filtration-DBD Plasma System Hazmi, Ariadi; Desmiarti, Reni; Waldi, Eka Putra; Emeraldi, Primas
Journal of Engineering and Technological Sciences Vol 48, No 1 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

In the palm oil industry, open ponding, aerobic and anaerobic digestion, physicochemical treatment and membrane ï¬ltration are generally applied as conventional treatments of palm oil mill effluent (POME). In this study, a sand filtration-dielectric barrier discharge (DBD) system was investigated as an alternative process for treating POME. This system can reduce land usage, processing time and costs compared to conventional systems. The removal efficiency of chemical oxygen demand (COD), biological oxygen demand (BOD5), and oil-grease in relation to the applied voltage were studied. Furthermore, the pH and temperature profiles were investigated. The obtained results indicate that the removal efficiency of COD, BOD5, and oil-grease increased with an increase of the applied voltage. The electrical energy consumption needed is about 10.56 kWh/L of POME.

Pengaruh Partikel Nanosilika Terhadap Sifat Tolak Air Bahan Isolasi Bionanokomposit Aulia, Aulia; Alfajri, Roan; Waldi, Eka Putra; Novizon, Novizon
JURNAL NASIONAL TEKNIK ELEKTRO Vol 9, No 2: July 2020
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jnte.v9n2.716.2020

The nature of hydropobicity plays an important role of an insulator, especially the outdoor insolator which is always exposed to hot, cold, humid weather and rain water. In the long run, the surface of the insulator can be damaged and its hydropobicity properties will be reduced or even lost so that surface discharge events will be easier to occur, especially in the rainy season. As a new material being developed, bionanocomposite insulation materials from LDPE, natural rubber and nanosilica fillers have passed several dielectric properties such as partial discharge characteristics under normal conditions and at higher temperature conditions. To complete the assessment of dielectric properties, a new bionanocomposite material hydropobicity was tested. There were 4 types of samples tested with the weight of the nanosilica material 1.5%, 3.0%, 4.5% and 6% of the total weight of the biocomposite sample. The test was carried out using a high-resolution camera to take pictures of the surface of the insulator sample that was dripped with water. The results show that nanosilica can increase the angle of contact of water with the bionanocomposite surface. This increase indicates an increase in the hydropobicity of bionanocomposite materialKeywords : LDPE, Karet Alam, Natural Rubber, nanosilica, hydrophobisityÂ AbstrakSifat hidropobisitas memainkan peran penting dari sebuah isolator, terutama isolator pasang luar yang selalu terpapar oleh perubahan cuaca panas, dingin, lembab dan air hujan. Dalam jangka panjang, permukaan isolator bisa rusak dan sifat hidropobisitasnya akan berkurang bahkan hilang sehingga peristiwa peluahan permukaan akan lebih mudah terjadi, terutama pada musim hujan. Sebagai material baru yang sedang dikembangkan, bahan isolasi bionanokomposit dari polietilena berkerapatan rendah (LDPE), karet alam (NR) dan pengisi nanosilika telah melewati beberapa pengujian sifat dielektrik seperti karakteristik peluahan sebagian pada kondisi normal dan pada kondisi suhu yang lebih tinggi. Untuk melengkapi pengkajian sifat dielektrik, maka dilakukan pengujian sifat hidropobisitas bahan bionanokomposit yang baru tersebut. Sampel yang diuji ada 4 jenis dengan kada berat bahan nanosilika 1,5%, 3,0%, 4,5% dan 6% dari berat total sampel biokomposit. Pengujian dilakukan dengan menggunakan kamera beresolusi tinggi untuk mengambil gambar permukaan sampel isolator yang ditetesi air. Hasil menunjukan bahwa nanosilika dapat memperbesar sudut kontak air dengan permukaan bionanokomposit. Peningkatan ini mengindikasikan meningkatnya sifat hidropobisitas material bionanokomposit.Kata Kunci : Biokomposit, Hidropobisitas, Karet Alam, LDPE

Web-based Monitoring System for Power Electronics Devices on Off-grid Solar Power Generator Luthfi, Amirul; Waldi, Eka Putra; Darmawan, Darmawan; Baharudin, Baharudin; Sunaryo, Budi
JURNAL NASIONAL TEKNIK ELEKTRO Vol 10, No 1: March 2021
Publisher : Jurusan Teknik Elektro Universitas Andalas

Power electronic devices are the main component of the solar power generation system. This study proposes a web-based monitoring system which presents power electronic performance parameter in a real-time across an internet connection. The investigation takes ACS712 and PZEM-004T for the power converter performance measuring and Arduino Mega 2560 with an ethernet shield for data acquisition and transmission. This paper describes the schematic design of the hardware and also explains the software work-flow and structure. The test and calibration on the sensor's voltage and current to standard digital multi-meter Tektronix DMM4050 show the sensor able to accurately read the converter performance parameter and meet the standard IEC-61724. The functionality test on the web-based information system indicates the designed user interface to present the power electronic performance parameter of the solar power generator.Keywords: Monitoring System, Power Electronics and Solar Power

Pengaruh Penuaan Elektrik Terhadap Karakteristik Tegangan Tembus dan PDIV Minyak NanoNynas Aulia, Aulia; Manab, Abdul; Putra Waldi, Eka; Kodrat, Muhammad; Widia, Gusvita
JURNAL NASIONAL TEKNIK ELEKTRO Vol 7, No 1: March 2018
Publisher : Jurusan Teknik Elektro Universitas Andalas

The dielectric strength of pure nynas oil can be enhanced by adding various nanoparticles such as nanoalumina (Al2O3). To see the effect of the addition of alumina nanoparticles, 4 types of nynas oil have been prepared with the addition of nanoalumina particles by 0.00%, 0.010%, 0.015% and 0.020%. All samples were tested for dielectric breakdown voltage and partial discharge inception voltage (PDIV) test at room temperature with reference to IEC 60156 test standards. The results showed that the nanonynas oil breakdown voltage increased by 6% and the value of the partial discharge inception voltage also higher than that of pure oil.Â Keywords : Mineral oil, alumina, brekadown voltage, partial discharge inception voltageAbstrakKekuatan dielektrik minyak transformator nynas nitro murni dapat ditingkatkan dengan menambahkan berbagai partikel nano seperti nanoalumina (Al2O3).Penelitian ini bertujuan untuk melihat effek penambahan partikel nano alumina terhadap karakteristik tegangan tembus dan tegangan insepsi peluahan sebagian. Empat jenis minyak nynas dengan komposisi penambahan partikel nanoalumina sebesar 0.00%, 0.010%, 0.015% dan 0.020% diuji tegangan tembus dielektrik, tegangan insepsi peluahan sebagian (PDIV) pada suhu ruang dengan merujuk kepada standar pengujian IEC 60156. Hasil menunjukkan bahwa tegangan tembus minyak nanonynas meningkat sebesar 6% dan nilai tegangan insepsi dan peluahan sebagian lebih tinggi dibandingkan dengan minyak murni.Â Kata Kunci : Minyak Â nynas nitro libra, alumina (AL2O3), tegangan tembus, PDIV

Pembangkit Listrik Pikotermal Matahari, Kajian Awal Aulia, Aulia; Darwison, Darwison; Razak, Faisyal; Waldi, Eka Putra
JURNAL NASIONAL TEKNIK ELEKTRO Vol 6, No 1: Maret 2017
Publisher : Jurusan Teknik Elektro Universitas Andalas

A Picothermal solar power plant (PLTPM) is an original concept that is still under study. Testing and calculation of voltage and electrical current is carried on a single thermoelectric, thermoelectric cells connected in series and parallel connected thermoelectric cells due to rise in temperature in the cells. The results showed that the increase in temperature of 71 Â°C produces 1 volt output voltage and current of 0.1 amperes. In accordance with the principle of series and parallel connection, series connection is able to multiply the output voltage and the parallel connections double the current output for one additional thermoelectric cell chipKeywords : Picothermal, thermoelectric cell and series, parallel, temperatureAbstrakâ€” Pembangkit listrik pikotermal matahari (PLTPM) merupakan konsep awal yang masih dalam tahap kajian. Pengujian dan perhitungan tegangan dan arus listrik dilakukan terhadap termoelektrik tunggal, sel termoelektrik terhubung seri dan sel termoeletrik terhubung paralel akibat kenaikan suhu pada sel-sel tersebut. Hasil memperlihatkan bahwa kenaikan suhu sebesar 71 oCÂ menghasilkan tegangan keluaran 1 volt dan arus 0.1 Amper. Sesuai dengan kaedah hubungan seri dan paralel, hubungan seri mampu melipat gandakan tegangan keluaran dan hubungan paralel melipatkan gandakan arus keluaran untuk tambahan setiap satu keping sel termoelektrik.Kata Kunci : pikotermal, sel termoelektrik, seri, paralel, kenaikan suhu

Prediction of ZnO Surge Arrester Degradation Based on Temperature and Leakage Current Properties Novizon, Novizon; Abdul-Malek, Zulkarnain; Aulia, Aulia; Waldi, Eka Putra; Rajab, Abdul; Darwison, Darwison
JURNAL NASIONAL TEKNIK ELEKTRO Vol 7, No 2: July 2018
Publisher : Jurusan Teknik Elektro Universitas Andalas

Temperature and leakage current on the ZnO arrester are interrelated with each other. In low conduction region, voltage-current characteristics of ZnO surge arrester are highly dependent on temperature. The leakage current will increase as the temperature increases and experience thermal runaway when the temperature exceeds the acceptable limit. This phenomenon is associated with the increase of resistive leakage current due to degradation. Therefore the temperature and leakage current are good indicator to evaluate the condition of ZnO arrester. This paper proposed the degradationÂ prediction of ZnO surge arrester by analyzed the temperature and leakage current. The 132 kV station type ZnO surge arrester was employed. Temperature profile of ZnO arrester was obtained using thermal camera. The leakage current was measured simultaneous with the temperature measurement to attain the leakage current at the actual temperature. The results shows the leakage current continue increasing by increasing the temperature.Â Keywords : Resistive leakage current, temperature, degradation, prediction, zinc oxide surge arrester

Preliminary Study on biogas production from POME by DBD plasma Ariadi Hazmi; Reni Desmiarti; Primas Emeraldi; Muhammad Imran Hamid; Edwardo Edwardo; Eka Putra Waldi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 2: June 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i2.5574

A new technology to produce biogas using a dielectric barrier discharge (DBD) plasma system from palm oil mill effluent (POME) was investigated. The batch experiments were examined at applied voltages of 15, 20 and 25 kV. The results showed that the highest yields of hydrogen and methane were achieved at an applied voltage of 25 kV after 1 hour were 2.42 and 1.32 mL/mL of POME, respectively. The biogas was composed of 65% hydrogen and 35% methane. In order to make the results of this study applicable to biogas plants, the effects of flowrate and consumed energy are important parameters that should be further investigated in a future study.

The effect of silica content to partial discharge characteristic of low-density polyethene and natural rubber blend as the electrical insulator Aulia Aulia; Eka Putra Waldi; Darwison Darwison; Dwi Gustiono; Novizon Novizon; M. Heru Setiawan; M. A. Hafizi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 2: April 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v19i2.16417

The dielectric properties of low-density polyethylene natural rubber (LDPE-NR) biopolymeric insulating materials can be improved by adding the silica nanoparticles in a certain percentage of weight (w%). In the present study, four types of bio-nano polymeric samples were prepared. To each sample, the nanosilica particles with wt% 1.5%, 3%, 4.5% and 6%. As one characteristic of dielectric, the partial discharge (PD) characteristics, each sample has been tested for 1 hour under AC high voltage field, and the pulses were counted for each sample and grouped into positive and negative pulses. The PD pattern was also plotted based on X-Y axes, namely Φ-q-n pattern. It was found that the number of positive and negative partial discharge (PD) pulses for each silica sample after 60 minutes of testing varied for all samples. It is also found that samples with a higher percentage of nanosilica had fewer PD pulses. The PD pattern in lower w% of silica was identified in the 90 degrees mostly in containing This indicates that w% of nanosilica particles can improve the PD resistance or the insulation quality of LDPE-NR insulation materials.

The Correlation of Statistical Image and Partial Discharge Pulse Count of LDPE-NR Composite Aulia Aulia; Zulkarnain Abdul Malek; Yanuar Zulardiansyah Arief; Eka Putra Waldi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 3: September 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i3.5149

High voltage insulation must be designed in such a way that it is very resistant to ageing including that from partial discharge (PD). Many studies were previously carried out on composites based on low density polyethylene (LDPE). However, the use of natural rubber (NR) and nanosilica (SiO2) in the LDPE-NR based composites is relatively new. Furthermore, the PD resistant performance of the composites is yet to be extensively researched. This work aims to analyze the correlation between PD pulse count and its related image to interpreting the effect of PD signals. The results show there is a strong correlation between PD pulse count and the statistical image. The results indicate that the surface image statistical analysis can be used as a tool to justify the total of the PD pulse count on the surface for different samples of composite.

Co-Authors . Darwison Abdul Manab Abdul Rajab Abdul-Malek, Zulkarnain Abral, Hairul Alfajri, Roan Amirul Luthfi, Amirul Ariadi Hazmi Arief Hadiwibowo Asri Indah Lestari Aulia Aulia Aulia Aulia Aulia Aulia Aulia, Aulia Aulia, Aulia Baharuddin Abbas, Baharuddin Baharudin Baharudin Budi Sunaryo D. Darwison Darmawan, Darmawan Darwison Darwison Darwison, Darwison Dwi Gustiono Edwardo Edwardo Faisyal Razak Gusvita Widia Kodrat, Muhammad M. A. Hafizi M. H. Ahmad M. Heru Setiawan Maemonah, Maemonah Masayuki Nagao Masayuki Nagao Mohd Hafizi Ahmad Muhammad Imran Hamid Muhammad Kodrat Naohiro Hozumi Nora Idiawati Novizon, Novizon Primas Emeraldi Razak, Faisyal Reni Desmiarti Reni Desmiarti Reni Desmiarti Reni Desmiarti Reni Desmiarti Roan Alfajri Rudy Fernandez Sunaryo, Budi Syaifa Mulyadi Syukri Arief Widia, Gusvita Yanuar Zulardiansyah Arief Yoshinobu Murakami Yoshinobu Murakami Zulkarnain Abdul Malek Zulkarnain Abdul-Malek

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