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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) 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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Breakdown on LDPE film due to partial discharge in air gap and its correlation with electrical properties and surface degradation Eka Putra Waldi; Yoshinobu Murakami; Masayuki Nagao
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 5: October 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i5.12245

This paper describes the breakdown characteristic of the low density poly ethylene film caused by partial discharge in the air gap. The purpose of this paper is to clarify the effect number of discharge under repetition rectangular pulses with a needle-plane electrode system as a function of pulse frequency. The result performed, from 10 Hz up to 1000 Hz. From 10 Hz to 200 Hz, the pulse number up to breakdown did not change significantly with increasing the pulse frequency and the magnitude of partial discharge function of pulse number with varied frequency until breakdown were similar. By using both potential decay and surface degradation analysis function of number of pulse, the breakdown phenomena caused by partial discharge was shown to reveal a significant correlation between electrical properties and the transparency of its surface to change deposited on it by a partial discharge exposure.

Space charge phenomena on low-density poly ethylene film breakdown under heavy water absorption Eka Putra Waldi; Rudy Fernandez; Yoshinobu Murakami; Naohiro Hozumi; Masayuki Nagao
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 6: December 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i6.16537

The effect of dry and heavy water absorption on the electrical breakdown of low-density poly ethylene film was investigated. The temperature rise of the sample was observed by thermograph until the electrical breakdown using direct current ramp voltage. The conduction current of low-density poly ethylene film was also measured, and the result was then correlated with thermograph measurement. Meanwhile, the space charge distribution in asample was measured by the pulse electro-acoustic method. From the thermograph, the result can be seen that under the heavy water absorption, the sample was more dissipated than the dry condition. Then, the breakdown occurs at the lower value of the voltage application, but the higher conduction current. Furthermore, the pulse electric acoustic show that increases the charge injection to the sample in the heavy water absorption. Increased space charges associated with an increase in the current conduction and the formation of heating, which results in a thermal breakdown.

An optimized method of partial discharge data retrieval technique for phase resolved pattern Eka Putra Waldi; Aulia Aulia; Ariadi Hazmi; Hairul Abral; Syukri Arief; Mohd Hafizi Ahmad
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 1: March 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v14i1.2602

The measurement of phase resolved partial discharge requires a gigantic memory capacity to store all the waves of the PD test results. This limitation eventually hinders the testing. It is necessary to optimize on the aspect of memory storage capability to reduce the storage requirements. In light of foregoing, the partial discharge data retrieval techniques with sampling rate methods were used to detect the peak of partial discharge as well as the PD constituent representatives. The optimization process was performed by using integration of oscilloscope and LabVIEW software. The partial discharge data recording can be easily confined to the points of the partial discharge occurrence only. As results, the storage points were reduced by taking wave magnitude associated with PD, thereby resulting in more representative data. Therefore, this optimized method was able to reduce the file size of the test results up to 97 percent of PD original size thereby decreasing the usage of hard disk storage.

Rogowski coil sensor in the digitization process to detect partial discharge Eka Putra Waldi; Asri Indah Lestari; Rudy Fernandez; Syaifa Mulyadi; Yoshinobu Murakami; Naohiro Hozumi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 2: April 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i2.14282

This paper presents the construction of a Rogowski Coil sensor with an air core to detect partial discharge using a digital oscilloscope. Two types of sensors are used. The first is the primary sensor winding with back wire, and the second is without back wire, labeled BW and WBW, respectively. The numbers of primary-turn in the sensors are 5, 10, 20, and 40 turns. The performance of the sensors is tested using two types of tests. First, the wave response test with a fixed imitation partial discharge magnitude input is used to select the optimum sensitivity with the lower sampling rate, aims to select the peak or valley value as a magnitude partial discharge value. The second test is using an imitation partial discharge ramp to check the linearity of the sensors. The imitation of the partial discharge inputs is generated by a commercial charge calibrator. The wave response test results show an increase in the number of turns that corresponds to an increase of the sensor output for both sensors in a non-linear trend. In determining the sampling rate, the detection of magnitude in the valley is better than the peak. All sensors act linear toward the imitation partial discharge ramp either in BW or WBW conditions.

Removal of Microorganisms in Drinking Water using Pulsed High Voltage Ariadi Hazmi; Reni Desmiarti; Eka Putra Waldi; D. Darwison
Journal of Engineering and Technological Sciences Vol. 45 No. 1 (2013)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2013.45.1.1

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 Ariadi Hazmi; Reni Desmiarti; Eka Putra Waldi; Primas Emeraldi
Journal of Engineering and Technological Sciences Vol. 48 No. 1 (2016)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2016.48.1.3

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.

Pembangkit Listrik Pikotermal Matahari, Kajian Awal Aulia Aulia; Darwison Darwison; Faisyal Razak; Eka Putra Waldi
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 °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, temperatureAbstrak— 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 oC 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; Zulkarnain Abdul-Malek; Aulia Aulia; Eka Putra Waldi; Abdul Rajab; 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 degradation 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. Keywords : Resistive leakage current, temperature, degradation, prediction, zinc oxide surge arrester

Pengaruh Penuaan Elektrik Terhadap Karakteristik Tegangan Tembus dan PDIV Minyak NanoNynas Aulia Aulia; Abdul Manab; Eka Putra Waldi; Muhammad Kodrat; Gusvita Widia
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. 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. Kata Kunci : Minyak nynas nitro libra, alumina (AL2O3), tegangan tembus, PDIV

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

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, hydrophobisity 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

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 Darmawan, Darmawan Dwi Gustiono Edwardo Edwardo Faisyal Razak Gusvita Widia 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 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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