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

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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

 1 
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

Abstract

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

Abstract

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

Abstract

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.
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

Abstract

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

Abstract

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

Abstract

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

Abstract

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.
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