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Pengukuran Arus Listrik, Medan Listrik Dan Image Petir Secara Simultan

JURNAL ILMIAH ELEKTRON Vol 2, No 2 (2010)
Publisher : JURNAL ILMIAH ELEKTRON

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Abstract

We have measured simultaneously electric current, electric field and high speed image of positive leader in winter from high grounded structure at Hokuriku areas of Japan. It is found that there are correlations among sub-microsecond electric current, electric field and high speed image of lightning leader.

Perubahan Medan Listrik Atmosfir Sebagai Peringatan Bahaya Sambaran Petir

JURNAL ILMIAH ELEKTRON Vol 3, No 2 (2011)
Publisher : JURNAL ILMIAH ELEKTRON

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Abstract

Measurement of atmospheric electric field changes was done by using both the electric field mill (EFM) and fast electric field change antenna. The observations of the electric field change shown that the atmospher electric field changed very significant before the first lightning strike during a thunderstorm was going on. The electric field changes was greater than 1 kV/m indicated that began the process of cloud electrification intensively. These indications can be used as a basis for lightning warning system. This paper also shows the waveform of the electric field of return stroke when the lightning stroke to earth.

Pengukuran Radiasi Elektromagnetik Petir

JURNAL ILMIAH ELEKTRON Vol 3, No 1 (2011)
Publisher : JURNAL ILMIAH ELEKTRON

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Abstract

We have being performed a campaign to simultaneously record the electromagnetic parameters, especially the electric field and magnetic field of lightning discharges that occurred on Limau Manis, Padang City. During the rainy season of 2011, we successfully recorded the electromagnetic parameters of its associated downward lightning. The observed lightning was type of positive lightning of cloud to ground (CG) and intracloud (IC) flash. Expanded electric field change waveform showed that there were some stages in lightning flash process.

Behavior of Microorganisms Using Radio-Frequency (RF) Plasma System

JURNAL ILMIAH ELEKTRON Vol 4, No 1 (2012)
Publisher : JURNAL ILMIAH ELEKTRON

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Abstract

Kami telah melakukan penelitian untuk studi perilaku mikoorganisme dalam air minum dengan menggunakan sistem plasma radio frekuensi (RF). Hasil penelitian menunjukkan bahwa effisiensi penghilangan E. Coli dan Total Coliform masing-masing mencapai 100% dan 95,2-100%. Kualitas air minum yang dicapai dengan sistem RF berdasarkan standar Permenkes No. 492/Menkes/Per/IV/2010. Pengaruh frekuensi terhadap pH, konduktivitas, oxidation reduction potential (ORP), total dissolve solvent (TDS) dan temperatur juga diamati dalam paper ini.

An optimized method of partial discharge data retrieval technique for phase resolved pattern

TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 1: March 2016
Publisher : Universitas Ahmad Dahlan

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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.

Preliminary Study on Treatment of Palm Oil Mill Effluent (POME) by Sand Filtration-DBD Plasma System

Journal of Engineering and Technological Sciences Vol 48, No 1 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

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Abstract

In the palm oil industry, open ponding, aerobic and anaerobic digestion, physicochemical treatment and membrane filtration 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.

Preliminary Study on biogas production from POME by DBD plasma

TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 2: June 2017
Publisher : Universitas Ahmad Dahlan

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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.

Analisis Gelombang Elektromagnetik dan Seismik yang Ditimbulkan oleh Gejala Gempa

JURNAL NASIONAL TEKNIK ELEKTRO Vol 5, No 3: November 2016
Publisher : Jurusan Teknik Elektro Universitas Andalas

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Abstract

Earthquakes are a natural phenomenon which is difficult to predict when and how it will happen. Effort is needed to minimize the risk of earthquakes, such as the observation of the early signs before an earthquake occurs (precursor). This study was conducted to observe earthquakes in West Sumatra in two ways. Observations eleketromagnetik waves utilizing radio waves from the two stations. The study also uses seismic wave sensors that are placed in the Department of Electrical Engineering, University of Andalas. Based on the results of data processing of the transmission of radio waves, it is known that electromagnetic anomalies can be recorded by utilizing radio wave propagation. However, with the line of sight propagation cause a lot of loss propagation, and less effective in recording. For the recording of the earthquake through the seismic waves very well. The measurement results for the direction of the epicenter compared with the measurement result BMKG for some earthquakes end of 2013 were felt in the West Sumatra. The average error of measurement gained 9.6% since the phase delay is affected by the accuracy of the sensor device.Keywords: Earthquakes, Electromagnetic, SeismicAbstrak- Gempa bumi adalah fenomena alam yang sulit diprediksi kapan dan bagaimana akan terjadi. Diperlukan usaha untuk meminimalisir resiko gempa bumi, seperti pengamatan tanda tanda awal sebelum gempabumi terjadi (prekursor). Penelitian ini dilakukan untuk mengamati kejadian gempa di Sumatera Barat melalui dua cara.  Pengamatan gelombang eleketromagnetik memanfaatkan gelombang radio dari dua stasiun. Penelitian juga menggunakan sensor gelombang seismic yang ditempatkan di jurusan Teknik Elektro, Universitas Andalas. Berdasar hasil pengolahan data dari transmisi gelombang radio, maka diketahui bahwa anomaly elektromagnetik  dapat direkam dengan memanfaatkan propagasi gelombang radio. Namun propagasi dengan line of sight banyak menimbulkan rugi-rugi propagasi, dan kurang efektif dalam perekaman. Untuk rekaman gempa melalui gelombang seismik sangat baik. Hasil pengukuran untuk arah pusat gempa dibandingkan dengan hasil pengukuran BMKG untuk beberapa kejadian gempa akhir tahun 2013 yang dirasakan di Sumatera Barat. Adapun error rata-rata pengukuran yang didapat 9.6% karena dipengaruhi oleh keakurasian delay phasa alat sensor.Kata kunci: Gempa bumi, Elektromagnetik, Seismik

Sistem Informasi Petir (SIP) Dengan Metode Lightning Distribution (LD) di Wilayah Sumatera Barat

JURNAL NASIONAL TEKNIK ELEKTRO Vol 3, No 2: September 2014
Publisher : Jurusan Teknik Elektro Universitas Andalas

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Abstract

This paper mapped 200 locations of lightning strikes in West Sumatra province. Mapping the location of lightning strikes as part of Lightning Information System  was designed with the method of Lightning Distribution (LD). To get the location of lightning strikes obtained from the calculation reflection of ionosphere method to determine the distance of a lightning strike from stations of lightning and methods of Magnetic Direction Finding (MDF) to get directions from the lightning strike. Direction data obtained processed to generate a lightning incident location, then that location will be displayed on Google Maps. After that in the process of Lightning Distribution method which is a form of lightning strike density mapping by using the "File Format" grid, where each grid was measured to be 1 x 1 km2 called the Local Density Flash (LFD). If there are multiple point strikes on the grid will change the color that is on the map fit how many number of strikes on the grid which is a Probabilistic computation Flash Density (PFD). The depiction of the scale of danger  lightning in the form of variations color changes at the point where the bolt of green color represents the minimum number density of lightning strikes that contains a single point and the red color represents the maximum number density of strikes which contains more than ten points strike. Based on the color distribution of lightning strikes and Payakumbuh Agam area has the highest rate of lightning strikes in the study period.Key words: reflection ionosphere, magnetic direction finding (MDF), lightning distribution, lightning information system, and google maps API. AbstrakPaper ini memetakan 200 lokasi sambaran petir di daerah Sumatera Barat. Pemetaan lokasi sambaran petir sebagai bagian dari Sistem Informasi Petir (SIP) dirancang dengan metode Lightning Distribution (LD). Lokasi sambaran petir diperoleh menggunakan metode refleksi ionosfer untuk mengetahui jarak sambaran petir dari stasiun pendeteksi petir dan metode Magnetic Direction Finding (MDF) untuk mendapatkan arah dari sambaran petir. Data arah kemudian diproses untuk menghasilkansuatulokasikejadianpetir, kemudian lokasitersebutakan ditampilkan pada Google Maps. Setelah itu di proses dengan metode Lightning Distribution yang merupakan bentuk pemetaan kerapatan sambaran petir dengan menggunakan “Format File grid”, dimana setiap grid diukur sebesar 1 x 1 km2 yang disebut dengan Local Flash Density (LFD). Jika terdapat beberapa titik sambaran pada satu grid akan merubah warna yang ada pada peta sesuai seberapa banyak jumlah sambaran pada satu grid yang merupakan perhitungan Probabilistic Flash Density (PFD). Penggambaran besarnya skala bahaya petir berupa variasi perubahan warna pada titik sambaran dimana warna hijau mewakili jumlah minimum kerapatan sambaran yang berisikan satu titik sambaran dan warna merah mewakili jumlah maximum kerapatan sambaran yang berisikan lebih dari sepuluh titik sambaran. Berdasarkan warna distribusi sambaran petir daerah Kabupaten Agam dan Payakumbuh memiliki tingkat sambaran petir tertinggi pada periode penelitian ini.Kata kunci :          refleksi ionosfer, magnetic direction finding (MDF), lightning distribution, sistem informasi petir, dangoogle maps API

Aplikasi Plasma Dengan Metoda Dielectric Barrier Discharge (DBD) Untuk Pengolahan Limbah Cair Kelapa Sawit

JURNAL NASIONAL TEKNIK ELEKTRO Vol 2, No 2: September 2013
Publisher : Jurusan Teknik Elektro Universitas Andalas

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Abstract

The processing of palm oil into crude palm oil (CPO) produced palm oil mill effluent (POME) as many as 2500 l/ton of CPO. POME contains Chemical Oxygen Demand (COD) average of 21,280 mg/l, Biochemical Oxygen Demand (BOD) average of 34,720 mg/l, fatty oils average of 3,075 mg/l and the average pH of 4. Wastewater treatment systems in the palm oil industry is the combination of physical processes such as sedimentation and biological processes, either anaerobic or aerobic. The weaknesses of conventional processing systems is a long processing time (10-90 days) and require extensive land area (± 6 times the total area of the factory). This study aims to provide an alternative method for POME treatment with plasma system through  Dielectric Barrier Discharge (DBD). The results showed removal efficiency for COD, BOD and fatty are 53%, 55 % and 40 % with the processing time of 4 hours, respectively. Beside, consumed energy was 7.2 kWh/l for voltage application of 19 kV.Keywords: oil palm wastewater, DBD plasma, compounds organics, energy consumptionAbstrakProses pengolahan kelapa sawit menjadi minyak sawit mentah atau Crude Palm Oil (CPO) menghasilkan limbah cair sawit sebanyak 2500 l/ton CPO. Limbah cair kelapa sawit ini mengandung Chemical Oxygen Demand (COD) rata-rata sebesar 21.280 mg/l, Biochemical Oxygen Demand (BOD) rata-rata sebesar 34.720 mg/l, minyak lemak rata-rata sebesar 3.075 mg/l dan pH rata-rata sebesar 4. Sistem pengolahan limbah cair kelapa sawit di industri adalah dengan kombinasi proses fisik seperti sedimentasi dan proses biologi, baik secara anaerob atau aerob. Kelemahan dari sistem pengolahan konvensional adalah waktu pengolahan yang lama (10-90 hari) dan membutuhkan lahan yang sangat luas (± 6 kali dari luas areal pabrik). Penelitian ini bertujuan untuk memberikan alternatif pengolahan limbah cair kelapa sawit dengan sistem plasma melalui metoda Dielectric Barrier Discharge (DBD). Hasil penelitian menunjukan efisiensi penghilangan COD sebesar 53%, BOD sebesar 55% dan minyak lemak 40% dengan waktu pengolahan 4 (empat) jam. Konsumsi energi yang dibutuhkan 7,2 kWh/l untuk tegangan pembangkitan 19 kV.     Keywords: oil palm wastewater, DBD plasma, compounds organics, energy consumption