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Analysis of Unbalance Harmonic Propagation in a Three-phase Power System Syukri Yunus; Khalid Mohamed Nor
Indonesian Journal of Electrical Engineering and Computer Science Vol 13, No 3: March 2015
Publisher : Institute of Advanced Engineering and Science

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

Operation is non-linear in a state of unbalance can cause problems harmonics in the power system. There are two parts over the use of computational time in harmonic load flow, the first in the construction of harmonic admittance matrix and the second is the iteration scheme for solving systems of linear equations. Mechanical completion of the harmonic admittance to the problem can be expressed in this paper, was developed as a harmonic admittance parallel applications, and a direct algorithm to calculate the admittance matrix elements are presented. Here, we show three phase power flow program is broken down into three independent sub problems, namely: network sequence of positive, negative, and zero. Positive sequence network will be solved by using the method of Fast decouple without modifying their formulation. Negative and zero sequence networks solved using nodal voltage equation. All three networks have been modeled by a sequence of three independent circuits and solved simultaneously using multi-core processors in parallel programming. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7093

Catu Daya Tenaga Surya Sebagai Cadangan Listrik Pondok Pasantren di Teluk Buo, Padang Syafii Syafii; Adrianti Adrianti; Muhammad Nasir; Syukri Yunus
Jurnal Andalas: Rekayasa dan Penerapan Teknologi Vol. 2 No. 1 (2022): Juni 2022
Publisher : Jurusan Teknik Elektro, Universitas Andalas

Kegiatan pengabdian penyediaan catu daya tenaga surya sebagai cadangan listrik Pondok Tahfidz Teluk Buo telah dilakukan. Catu daya ini dapat dimanfaatkan sebagai alternatif cadangan ketersediaan tenaga listrik saat terputusnya suplai tenaga listrik dari PLN. Catu daya listrik panel surya ini terdiri dari 2 unit panel surya 150 Wp, inverter 850 VA, dan 2 unit baterai @100 Ah. Baterai dapat diisi ulang dengan menggunakan daya listrik dari panel surya pada saat matahari bersinar (pagi sampai sore hari) untuk selanjutnya dapat digunakan pada saat terputusnya suplai tenaga listrik dari PLN. Catu daya tenaga surya memiiki keunggulan dibandingkan genset diesel krena tidak bising dan tidak membutuhkan bahan bakar minyak. Semoga ke depan proses pendidikan tahfidz qur’an dapat berjalan dengan baik meskipun listrik PLN padam. Kemajuan Pondok Tahfidz menjadi kemajuan warga di Teluk Buo.

Pemeliharaan dan Perbaikan Instalasi Listrik Pondok Tahfidz Darul Hijrah Wal Amanah Muhammad Nasir; Adrianti Adrianti; Syafii Syafii; Syukri Yunus
Jurnal Andalas: Rekayasa dan Penerapan Teknologi Vol. 2 No. 2 (2022): Desember 2022
Publisher : Jurusan Teknik Elektro, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jarpet.v2i2.35

Ketersediaan catu daya cadangan saat terjadi pemadaman listrik PLN sangat dibutuhkan di Pondok Tahfidz Darul Hijrah Wal Amanah, Teluk Buo, Padang. Catu daya cadangan bertenaga surya yang sudah dimiliki perlu dilakukan pemeliharaan agar awet dan berfungsi maksimal. Demikian juga dengan instalasi listrik pada area pondok yang masih memiliki banyak kekurangan. Departemen Teknik Elektro Universitas Andalas telah melakukan kegiatan Pengabdian Masyarakat di Pondok Tahfidz tersebut dengan tujuan melakukan pemeliharan catu daya cadangan dan perbaikan pada instalasi listrik di area Pondok. Kegiatan pengabdian dimulai dengan perencanaan, survei dan pengecekan, perbaikan dan diakhiri dengan kegiatan pembimbingan/training pemeliharaan kepada pengelola Pondok. Hasil kegiatan pengabdian adalah catu daya cadangan dapat berfungsi dengan baik kembali dan instalasi listrik telah ditambahkan sehingga pemakaian listrik dapat lebih mudah dan juga efisien.

Enhancing Current Density and Specific Capacitance through Tensile TEMPO, Bacterial Cellulose and Polypirrole Nanocomposites Syukri Yunus; Muhammad Fajar Ruhud Manurung; Aulia Aulia; Yanuar Zulardiansyah Arief
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.118

The researchers developed a bio-composite film material that serves as a substitute for metal. The materials used are TEMPO ((2,2,6,6-tetramethylpiperidine-1-oxyl)), Bacterial Cellulose, and Polypyrrole (Ppy). This research aimed to increase the material's current density and specific capacitance values using the drawing method. Composite nanomaterials are made by oxidizing BC (Bacterial Cellulose) with TEMPO. The resulting TOBC (TEMPO Bacterial Cellulose) material was mixed with Ppy using the in situ method. The mixture is then drawn wet—measurement of current density and capacitance using Cyclic Voltammetry (CV) Testing. The current density and specific capacitance results increased by 542.74% and 754.79% after drawing the nanocomposite material. It is directly proportional to the effects of characteristic testing, which includes SEM, XRD, and FTIR. As a result of the withdrawal of the polypyrrole, it will be more evenly distributed in the composite material, absorbing and coating the nata de coco. The researchers concluded that when the TOBC/Ppy fibers are straighter and denser, they achieve higher current density and capacitance values.

Analyzing Tensile Testing and Humidity Effects on Polyvinyl Alcohol, Polypyrrole Composites for Strain Sensing Syukri Yunus; Rifqi Rafif; Aulia; Mohammad Hafizi Ahmad
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 4 No. 1 (2024): May 2024
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v4i1.91

Biocomposite strain sensors must enhance their electrical properties and understand the impact of humidity on these properties. This study aimed to enhance the current density and specific capacitance of polyvinyl alcohol (PVA) and polypyrrole (Ppy) composite materials for strain sensors. The materials were prepared by blending polyvinyl alcohol and polypyrrole, followed by magnetic stirring, drying, and stretching. Current density and specific capacitance measurements were taken before and after the stretching process and at three distinct relative humidity levels (50%, 75%, and 93%). After the tensile test, the results indicated a significant increase in current density by 128.46% and a corresponding rise in specific capacitance by 112.57%. Furthermore, with an increase in relative humidity from 50% to 75%, current density and specific capacitance exhibited remarkable growth of 445.95% and 899.44%, respectively. The subsequent shift from 75% to 93% relative humidity resulted in a comparatively lower percentage increase in current density and specific capacitance at 22.59% and 10.29%, respectively, due to a decrease in hydroxyl bonds. These findings align with the material's characteristic tests, confirming that the improved electrical properties can be attributed to a more uniform distribution of polypyrrole during the stretching process and increased hydroxyl bonds associated with higher humidity levels. As electrical properties increase, the sensor's sensitivity will also rise.

Enhancing Current Density and Specific Capacitance of Nata de Coco, TEMPO, and MXene Composites through Boiling Time Variations Yunus, Syukri; Umah, Kuntum Khairah; Abral, Hairul; Ogah, Ogah Anselm; Aulia, Aulia
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 3 No. 3 (2023): November 2023
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v3i3.110

This research aimed to enhance the current density and specific capacitance of electronic device materials to replace traditional metal materials. Composite materials that include Nata de Coco, TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl), and MXene achieve this improvement. Composite materials that include Nata de Coco, TEMPO, and MXene accomplish this improvement. Initial testing has shown that these materials initially demonstrated lower electrical properties, particularly in current density and specific capacitance, than conventional metals. To enhance their electrical properties, we employed a boiling method with variations in boiling time. The time intervals chosen were 30, 300, and 480 minutes. In the manufacturing process, Nata de Coco, previously oxidized by TEMPO, was boiled in an MXene solution at a temperature of 70°C. We tested the electrical properties of the resulting composite film, focusing on current density and specific capacitance. The measured current density values, corresponding to the different boiling times, were as follows: 0.000239 A/cm² for 30 minutes, 0.000307 A/cm² for 300 minutes, and 0.000320 A/cm² for 480 minutes. The specific capacitance values were 1.7005 F/g for 30 minutes, 1.9707 F/g for 300 minutes, and 2.0364 F/g for 480 minutes. The percentage increase in current density and specific capacitance values from 30 minutes to 300 minutes of boiling was 22% and 13.7%, respectively. For boiling from 300 to 480 minutes, the increase was 4.06% for current density and 3.22% for specific capacitance. These findings suggest that longer boiling times result in improved electrical properties. Subsequently, characteristic tests were performed, including XRD (X-ray diffraction) and SEM (Scanning Electron Microscope) analyses. The XRD results indicated that longer boiling times caused a rightward shift of the diffraction peak with a narrower peak width, signifying increased crystallinity. The highest X-ray intensity was observed in the composite boiled for 480 minutes, with a power of 847.23 counts per second (cps) and a two-theta angle of 21.31°. Additionally, the smallest crystal size was achieved with a 480-minute boiling time, measuring 138.2851 Å. In the SEM analysis, it was evident that longer boiling times led to a higher fraction of MXene within the composite film.

Prototipe Turbin Angin Savonius Pada Kecepatan Angin Skala Kecil Untuk Pengisian Baterai Latif, Melda; Farizi, AL; Muharam, Mumuh; Laksono, Heru Dibyo; Yunus, Syukri; Rajab, Abdul; Fitrilina, Fitrilina
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 12 No. 1 (2022): Amplifier Mei Vol. 12, No 1 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v12i1.21673

The Vertical Axis Wind Turbines are very suitable for use in areas with very low wind speeds. This research makes a prototype of the Savonius wind turbine to produce electrical energy as an energy source to 2 x 3.7 Volt dry battery. The Savonius turbine has four blades made of PVC. The controller circuit consists of a Boost Converter circuit and an astable multivibrator. At a speed of 2.7 m/s, the wind turbine starts to rotate and produces a no-load voltage of 0.3 V. At a speed of 3.7 m/s a voltage of 2 V is generated and can charge the battery. By using an LED (Light Emitting Diode) in the controller circuit, the charged battery can be a source of voltage in the controller circuit and the LED indicator light can be lit.

Enhancing Current Density and Specific Capacitance of Nata de Coco, TEMPO, and MXene Composites through Boiling Time Variations Yunus, Syukri; Umah, Kuntum Khairah; Abral, Hairul; Ogah, Ogah Anselm; Aulia, Aulia
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 3 No. 3 (2023): November 2023
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v3i3.110

This research aimed to enhance the current density and specific capacitance of electronic device materials to replace traditional metal materials. Composite materials that include Nata de Coco, TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl), and MXene achieve this improvement. Composite materials that include Nata de Coco, TEMPO, and MXene accomplish this improvement. Initial testing has shown that these materials initially demonstrated lower electrical properties, particularly in current density and specific capacitance, than conventional metals. To enhance their electrical properties, we employed a boiling method with variations in boiling time. The time intervals chosen were 30, 300, and 480 minutes. In the manufacturing process, Nata de Coco, previously oxidized by TEMPO, was boiled in an MXene solution at a temperature of 70°C. We tested the electrical properties of the resulting composite film, focusing on current density and specific capacitance. The measured current density values, corresponding to the different boiling times, were as follows: 0.000239 A/cm² for 30 minutes, 0.000307 A/cm² for 300 minutes, and 0.000320 A/cm² for 480 minutes. The specific capacitance values were 1.7005 F/g for 30 minutes, 1.9707 F/g for 300 minutes, and 2.0364 F/g for 480 minutes. The percentage increase in current density and specific capacitance values from 30 minutes to 300 minutes of boiling was 22% and 13.7%, respectively. For boiling from 300 to 480 minutes, the increase was 4.06% for current density and 3.22% for specific capacitance. These findings suggest that longer boiling times result in improved electrical properties. Subsequently, characteristic tests were performed, including XRD (X-ray diffraction) and SEM (Scanning Electron Microscope) analyses. The XRD results indicated that longer boiling times caused a rightward shift of the diffraction peak with a narrower peak width, signifying increased crystallinity. The highest X-ray intensity was observed in the composite boiled for 480 minutes, with a power of 847.23 counts per second (cps) and a two-theta angle of 21.31°. Additionally, the smallest crystal size was achieved with a 480-minute boiling time, measuring 138.2851 Å. In the SEM analysis, it was evident that longer boiling times led to a higher fraction of MXene within the composite film.

Enhancing Current Density and Specific Capacitance through Tensile TEMPO, Bacterial Cellulose and Polypirrole Nanocomposites Yunus, Syukri; Manurung, Muhammad Fajar Ruhud; Aulia, Aulia; Arief, Yanuar Zulardiansyah
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.118

The researchers developed a bio-composite film material that serves as a substitute for metal. The materials used are TEMPO ((2,2,6,6-tetramethylpiperidine-1-oxyl)), Bacterial Cellulose, and Polypyrrole (Ppy). This research aimed to increase the material's current density and specific capacitance values using the drawing method. Composite nanomaterials are made by oxidizing BC (Bacterial Cellulose) with TEMPO. The resulting TOBC (TEMPO Bacterial Cellulose) material was mixed with Ppy using the in situ method. The mixture is then drawn wet—measurement of current density and capacitance using Cyclic Voltammetry (CV) Testing. The current density and specific capacitance results increased by 542.74% and 754.79% after drawing the nanocomposite material. It is directly proportional to the effects of characteristic testing, which includes SEM, XRD, and FTIR. As a result of the withdrawal of the polypyrrole, it will be more evenly distributed in the composite material, absorbing and coating the nata de coco. The researchers concluded that when the TOBC/Ppy fibers are straighter and denser, they achieve higher current density and capacitance values.

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