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PERANCANGAN DAN ANALISIS SISTEM TRANSFER DAYA LISTRIK TANPA KABEL DENGAN KUMPARAN MULTILAYER YANG BEKERJA PADA FREKUENSI RENDAH I Wayan Suwika Adnyana; Teti Zubaidah; Cahyo Mustiko Okta M
DIELEKTRIKA Vol 3 No 2 (2016): DIELEKTRIKA
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Mataram

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ABSTRAK Sistem transfer daya listrik nirkabel diartikan sebagai cara mengirimkan energi listrik dari satu titik ke titik yang lain melalui ruang vakum tanpa menggunakan kabel. Metode yang dapat digunakan dalam sistem ini yaitu resonansi magnetik, dimana frekuensi di sisi pengirim harus sama dengan frekuensi di sisi penerima. Penelitian ini menggunakan frekuensi rendah sebesar 1 kHz, 3 kHz dan 5 kHz dengan sumber dari rangkaian oscillator dan function generator. Pengukuran dengan rangkaian oscillator, nilai efisiensi daya listrik untuk jarak transfer 4 cm pada frekuensi 1 kHz sebesar 2,79 %, frekuensi 3 kHz sebesar 18,05 % dan frekuensi 5 kHz sebesar 6,41 % dengan jarak transfer maksimum untuk tiap-tiap frekuensi yaitu 1 kHz sejauh 10 cm, 3 kHz sejauh 20 cm dan 5 kHz sejauh 10 cm. Pengukuran dengan function generator, nilai efisiensi daya listrik maksimum pada frekuensi 1 kHz = 14,65 % di rata-rata frekuensi 1 kHz, frekuensi 3 kHz = 13,62 % di rata-rata frekuensi 3 kHz dan frekuensi 5 kHz = 28,61 % di rata-rata frekuensi 5,5 kHz. Nilai rata-rata medan magnet maksimum yang terukur pada level frekuensi 1 kHz = 33,91 µT, level frekuensi 3 kHz 12,97 µT dan level frekuensi 5 kHz = 5,21 µT. Nilai rata-rata nilai medan magnet yang terukur berada dibawah 0,2 mT sehingga aman bagi tubuh manusia menurut PER.13/MEN/X/2011. Kata kunci: Nirkabel, Frekuensi Rendah, Efisiensi, Resonansi, Induksi, Multilayer. ABSTRACT System of wireless electric power transfer is the way to deliver power in the vacuum areas without any cables. The system should be in the same frequencies both transmitter and receiver. The research uses induction and resonance methods with low frequencies (1kHz, 3kHz and 5 kHz) using oscillator and function generator. The result of measurement by oscillator series gives the electric power efficiency 2,79% at 1 kHz with 10 cm distances of transfer, 18,05% at 3 kHz with 20 cm distances of transfer, and 6,41% at 5 kHz with 10 cm distances of transfer. The result by function generator series gives the maximum electric power efficiency 14,65% at 1 kHz, 13,62% at 3 kHz and 28,1% at 5 kHz. The maximum average of magnetic fields is 33,91μT at 1 kHz, 12,97 μT at 3 kHz and 5,21 μT at 5 kHz. The average of measurement is under 0,2mT and it is still under the exposure limit of PER.13/MEN/X/2011. Keywords: Wireless, Low Frequency, Efficiency, Resonance, Induction, Multilayer.

PENGUKURAN RESISTIVITAS PADA DAERAH DUGAAN SUMBER PENYEBAB ANOMALI GEOMAGNETIK DI PULAU LOMBOK NTB Bulkis Kanata; Teti Zubaidah; Widya Utama; Dwa Desa Warnana; Cipta Ramadani
Jurnal Teknologi Elektro Vol 8 No 1 (2009): (January - June) Majalah Ilmiah Teknologi Elektro
Publisher : Universitas Udayana

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possibilities of the source of geomagnetic anomaly in Lombok Island, i.e. a specific local structure composed by a quite large magnetic body or a local fault in this region that could be associated with a source of seismic hazard (especially earthquakes). An interesting profile could be estimated lie around the minimum geomagnetic anomaly (8045’36”S, 11601’48”E) to the maximum one (8043’48”S, 1160 5’24” E). Understanding the corresponding structure on that profile is very important - related to the possibility of the source of geomagnetic anomaly in Lombok Island - in order to get further information about potentially local fault in this region as a source of earthquakes hazard. Geoelectric method with vertical electrical sounding (VES) configuration have been applied in this profile, on three VES points (i.e. one point between the minimum and the maximum geomagnetic anomaly (X1: 8046’42.9”S, 116004’07.7”E), and two other points outside (X2: 8046’03.3”S, 115058’39.9”E; which is on negative anomaly area) and (X3: 8042’11.6”S, 116008’27.2”E; which is on positive anomaly area). The potency of X1 as a critical zone has been shown, with the existence of resistivity contrast in this area, which its resistivity value between X2 (very high resistivity; r >25,000 Wm) and X3 (very low resistivity; ; r >1 W m). This results lead to the potentially local fault in this region as a source of earthquakes hazard.

Pengolahan Sinyal Geomagnetik di Regional Lombok dengan Metode Fraktal Bulkis Kanata; Teti Zubaidah; I Gusti Ayu Kusdiah
DIELEKTRIKA Vol 7 No 1 (2020): DIELEKTRIKA
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dielektrika.v7i1.215

Lombok Island is one of the islands in Indonesia with a high level of seismic activity, because Indonesia itself is in the ring of fire. Mount Rinjani is an active volcano that can be associated with seismicity on the island which can affect changes in geomagnetic fields in this case can cause geomagnetic anomalies. Based on this, a study of the fractal dimensions of geomagnetic signals in the Lombok region used data of Kupang Observatory (KPG), Kakadu (KDU) and Guam (GUA) to determine anomalies that could be suspected as earthquake precursors. The fractal dimension of a destructive earthquake is seen in the range 12-43 days before the earthquake event and 5-46 days for small earthquakes. Fractal dimension values are linear with earthquake distance to the observatory.

ANALISIS DATA GEOMAGNET MENGGUNAKAN METODE POLARISASI MAGNETIK KAITANNYA DENGAN GEMPA BUMI DI REGIONAL LOMBOK Pitaria Rahim Riani; Bulkis Kanata; Teti Zubaidah
DIELEKTRIKA Vol 3 No 1 (2016): DIELEKTRIKA
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Mataram

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ABSTRAK Regional Lombok merupakan daerah yang rawan akan kejadian gempa karena letaknya pada lempeng tektonik yang masih aktif bergerak. Sehingga penelitian tentang prekursor gempa bumi di wilayah ini sangat diperlukan. Pada penelitian ini dilakukan pengolahan data geomagnetik tahun 2011 yang terekam pada observatorium Kupang (KPG) di Indonesia, serta observatorium Kakadu (KDU) dan Charters towers (CTA) di Australia menggunakan metode polarisasi magnetik. Metode polarisasi magnetik merupakan metode yang memanfaatkan komponen medan magnet vertikal (Z) dan medan magnet horizontal (H) dalam domain frekuensi. Transformasi fourier cepat (FFT) diperlukan untuk mengubah data geomagnet dari domain waktu ke domain frekuensi. Kemudian dilakukan penapisan untuk memperoleh range frekuensi ULF 0.01-0.05 Hz. Hasil polarisasi magnetik kemudian dibandingkan dengan data kejadian gempa tahun 2011 yang di peroleh dari database US geological survey (USGS). Hasil dari penelitian ini adalah anomali yang dikatakan sebagai prekursor terlihat 1-3 minggu sebelum kejadian gempa. Tingkat keberhasilan metode mencapai 55,6% untuk KPG, 88,9% untuk KDU dan 44,4% untuk CTA. Tingkat keberhasilan pada KPG dan CTA lebih kecil dari KDU karena banyak data yang hilang pada KPG dan jauhnya letak observatorium dari pusat gempa pada CTA. Hal yang mempengaruhi hasil polarisasi adalah jarak pusat gempa ke observatorium, kedalaman gempa dan kesamaan lempeng tektonik antara pusat gempa dan observatorium. Kata Kunci : Lombok, geomagnetik, gempabumi, FFT, polarisasi magnetik

PENGUKURAN RESISTIVITAS PADA DAERAH DUGAAN SUMBER PENYEBAB ANOMALI GEOMAGNETIK DI PULAU LOMBOK NTB Bulkis Kanata; Teti Zubaidah; Widya Utama; Dwa Desa Warnana; Cipta Ramadani
Jurnal Teknologi Elektro Vol 8 No 1 (2009): (January - June) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

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

possibilities of the source of geomagnetic anomaly in Lombok Island, i.e. a specific local structure composed by a quite large magnetic body or a local fault in this region that could be associated with a source of seismic hazard (especially earthquakes). An interesting profile could be estimated lie around the minimum geomagnetic anomaly (8045’36”S, 11601’48”E) to the maximum one (8043’48”S, 1160 5’24” E). Understanding the corresponding structure on that profile is very important - related to the possibility of the source of geomagnetic anomaly in Lombok Island - in order to get further information about potentially local fault in this region as a source of earthquakes hazard. Geoelectric method with vertical electrical sounding (VES) configuration have been applied in this profile, on three VES points (i.e. one point between the minimum and the maximum geomagnetic anomaly (X1: 8046’42.9”S, 116004’07.7”E), and two other points outside (X2: 8046’03.3”S, 115058’39.9”E; which is on negative anomaly area) and (X3: 8042’11.6”S, 116008’27.2”E; which is on positive anomaly area). The potency of X1 as a critical zone has been shown, with the existence of resistivity contrast in this area, which its resistivity value between X2 (very high resistivity; r >25,000 Wm) and X3 (very low resistivity; ; r >1 W m). This results lead to the potentially local fault in this region as a source of earthquakes hazard.

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