Levana, Zahrani (2023) Analisis Karakteristik Busur Api Listrik Seri Berdasarkan Variasi Celah Elektroda, Tahanan Kontak, dan Impedansi Jaringan Menggunakan Metode Fast Fourier Transform (FFT). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada studi ini, eksperimen fenomena busur api listrik seri dilakukan dengan beban resistif pada sistem tegangan rendah AC. Eksperimen dilakukan dengan pengamatan busur api listrik di celah elektroda yang berdekatan berdasarkan variasi jarak celah antar elektroda, tahanan kontak, dan impedansi jaringan. Variasi jarak celah adalah sebesar 0,02 mm; 0,03 mm; dan 0,04 mm. Selain itu, variasi impedansi jaringan berupa panjang kabel yang masing-masing impedansi terukurnya adalah 0,78Ω dan 1,45Ω. Variasi tahanan kontak diukur dengan membagi nilai tegangan terukur di multimeter digital dengan nilai arus pada elektroda yang terhubung di sumber arus. Pengukuran ini dilakukan dari elektroda yang didekatkan sehingga bersentuhan sampai dijauhkan perlahan-lahan untuk mengetahui resistansi kontak saat ada celah. Modul NI 9246 dan NI 9775 digunakan untuk mengakuisisi data sinyal arus dan tegangan. Kemudian, sinyal arus dianalisis karakteristiknya menggunakan algoritma FFT di MATLAB. Berdasarkan hasil, nilai impedansi jaringan memiliki nilai korelasi sebesar -0,254 terhadap besarnya tegangan maksimum busur api listrik. Sementara itu, nilai korelasi impedansi jaringan terhadap arus maksimum busur api listrik adalah 0,0243. Karakteristik arus busur api listrik seri dengan metode FFT memiliki harmonisa orde ganjil, yaitu orde ketiga (150 Hz), kelima (250 Hz), ketujuh (350 Hz), dan kesembilan (450 Hz). Terdapat anomali bahwa semakin besar lebar celah elektroda, maka semakin besar arus busur api listrik seri. Anomali tersebut disebabkan oleh permukaan elektroda yang terkarbonisasi. Pada variasi tahanan kontak, tegangan dan arus busur api listrik tidak dapat sustain dengan tahanan kontak yang besarnya ≥ 2,26 mΩ. Hal ini disebabkan oleh pengaruh resistivitas udara yang tinggi.
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In this study, experiments on the phenomenon of series arcing were conducted with resistive load on a low-voltage AC system. Experiments were carried out by observing arcing in adjacent electrode gaps based on variations in the gap distance between electrodes, contact resistance, and network impedance. The variation in the gap distance is 0.02 mm; 0.03 mm; and 0.04 mm. In addition, variations in the network impedance are in the form of cable lengths, each of which has measured impedance of 0.78Ω and 1.45Ω. The variation of contact resistance is measured by dividing the measure voltage value on the digital multimeter by current value on the electrode connected to the current source. This measurement is carried out from the electrodes that are brought closer so that they touch until they are slowly kept apart to determine the contact resistance when there is a gap. NI 9246 and NI 9775 modules are used to acquire current and voltage signal data. Then, the current signal characteristics are analyzed using the FFT algorithm in MATLAB. Based on the results, the network impedance value has a correlation value of -0.254 to the maximum voltage of arcing. Meanwhile, the correlation value of network impedance to the maximum current of arcing is 0.0243. The characteristics of the series arcing using FFT method have add order harmonics, namely third order (150 Hz), fifth (250 Hz), seventh (350 Hz), and ninth (450 Hz). There is an anomaly that as the width of electrode gap increases, the series arcing current also increases. The anomaly is caused by the carbonized surface of the electrode. In the variation of contact resistance, voltage and current arcing cannot sustain with a contact resistance of ≥ 2,26 mΩ. This is caused by the effect of air resistivity.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | busur api listrik, celah elektroda, fast fourier transform, impedansi, tahanan kontak, arcing, contact resistance, electrode gap, fast fourier transform, impedance |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2861 Electric relays. Protective relays--Security measures. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5102.9 Signal processing. |
| Divisions: | Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | Zahrani Levana |
| Date Deposited: | 26 Jul 2023 05:13 |
| Last Modified: | 26 Jul 2023 05:13 |
| URI: | http://repository.its.ac.id/id/eprint/99236 |
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