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Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315
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Jurnal SPEKTRUM
Published by Universitas Udayana
ISSN : 23023163     EISSN : 26849186     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering
Jurnal SPEKTRUM is peer review journal, published four times a year by the Department of Electrical Engineering, Faculty of Engineering, Universitas Udayana. This journal discusses the scientific works containing results of research in the field of electrical, include: power systems, telecommunications, computers, informatics, controls, and electronics. Authors are expected to include original scientific papers in accordance with the scope of the discussion of this journal including all aspects of the theory and practice are used.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 677 Documents
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POTENSI DAYA DARI SOLAR CELL TERPASANG SESUAI DENGAN POLA ATAP RUMAH BERBASIS ARSITEKTUR BALI I Nyoman Apriana Arta Putra; Wayan Arta Wijaya; I.G.N Janardana
Jurnal SPEKTRUM Vol 6 No 1 (2019): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (770.614 KB) | DOI: 10.24843/SPEKTRUM.2019.v06.i01.p04

Abstract

This study was conducted to determine the potential power obtained at home with the Balinese roof pattern when developed with renewable energy sources. Solar energy as a source of renewable energy has enormous potential, especially in Indonesia. Balinese architecture-based roof pattern has 4 fields, the north and south side are trapezoidal and the east and west sides are triangular with 350 roof inclination angle. One of Bali's traditional buildings is Bale Sari, which is a case study with an area of ??32.64 m2, length 6.40m and width 5.10m. Bale Sari's roof has a pyramid pattern, each side having the same length and width. Methods performed in this study with manual calculations to find the potential maximum power. The total number of solar panels used is 234 pieces. With this amount, obtained the best potential results on the southern side, with an average power gained of 667.67 Watt. The results are obtained when the sun is at a maximum warming point or precisely when the weather is sunny. The result of the average power potential analysis obtained by solar cell installed on the roof of the Balinese architecture house is 1,935.49 Watt.
RANCANG BANGUN SISTEM INFORMASI GEOGRAFIS PEMETAAN OPTICAL DISTRIBUTION POINT (ODP) PADA PT. TELKOM AKSES BALI SELATAN BERBASIS WEB DAN ANDROID Anak Agung Dewi Sintyarianti; I Made Arsa Suyadnya; Duman Care Khrisne
Jurnal SPEKTRUM Vol 4 No 2 (2017): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (341.363 KB) | DOI: 10.24843/SPEKTRUM.2017.v04.i02.p08

Abstract

PT Telkom Access (PTTA) is a provider of network infrastructure construction and management services. The company is experiencing various obstacles in managing network infrastructure. One of them is the inefficient coordination between technicians and helpdesk when connecting ODP. In order for technicians to immediately connect customers with the nearest ODP, the technicians need specific ODP location information to be fixed. So far no ODP mapping system has been used. Based on the existing problems, then this research proposes the design and development of Geographic Information System Application mapping ODP web-based for helpdesk and Android mobile-based apps for technicians. Based on the results of testing the application with Black-box testing method, all the functionality of ODP mapping system on web and Android that has been built can run well.
ANALISIS PENGARUH SOFT HANDOVER PADA MOBILE STATION TERHADAP KUALITAS LAYANAN VOIP DI JARINGAN UMTS Putu Fadly Nugraha; IGAK Diafari Djuni H; Pande Ketut Sudiarta
Jurnal SPEKTRUM Vol 1 No 1 (2014): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1646.878 KB)

Abstract

VoIP memungkinkan suara ditransmisikan dengan infrastruktur packet switched yaitu denganmengubah suara (sinyal analog) menjadi format data digital. Salah satu ukuran kualitas layanan suaraVoIP adalah delay, jitter, packet loss. Pada penelitian ini skenario dilakukan berdasarkan simulasiuntuk mengetahui pengaruh soft handover dengan posisi Node B apabila posisi Node B searah dantidak searah dengan lintasan yang dilalui oleh user. Dari hasil simulasi pada posisi Node B searahdiperoleh selisih nilai kualitas layanan 0,10 s dan 0,4 % terhadap posisi Node B tidak searah. Untuknilai kualitas layanan pada hasil simulasi masih sesuai dengan standar yang ditetapkan ITU-T G.114
ANALISIS UNJUK KERJA ZERO FORCING EQUALIZER PADA SISTEM OFDM MIMO R. A. Prayitno; N.M.A.E.D. Wirastuti; I.G.A.K.D.D. Hartawan
Jurnal SPEKTRUM Vol 5 No 1 (2018): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (315.312 KB) | DOI: 10.24843/SPEKTRUM.2018.v05.i01.p10

Abstract

Wireless network is one of the most important things in the development of telecommunication. However, the existing wireless technology has not been able to efficiently create a very high data rate because it was very sensitive to fading. Therefore, Orthogonal Frequency Division Multiplexing (OFDM) technology combined with MIMO (Multiple Input Multiple Output) transceiver system was used to gain more diversity and bandwidth efficiency. The propagation performed on the OFDM MIMO system was multipath propagation. To reduce Intersymbol Interference (ISI) was used Zero Forcing (ZF) equalizer which works by combining channel response and equalizer response itself to eliminate ISI. This study aims to determine the effect of Zero Forcing Equalizer on OFDM MIMO system using rayleigh fading channel and compared the result with OFDM MIMO STBC system. The research method used was simulation using MatLab R2015a. The simulation results showed that the performance of OFDM MIMO ZF system was worse than OFDM MIMO STBC system i.e BER vs EbNo simulation, eye diagram simulation, and constellation diagram simulation. The OFDM MIMO ZF system was required an Eb / No value more than 25 dB to achieve BER 10-4 while the OFDM MIMO STBC system only required an Eb / No value of 10.5 dB to achieve BER 10-4. The eye pattern generated by the OFDM MIMO ZF system was more closed and the dispersion of constellation signals away from the ideal point while OFDM MIMO STBC system displayed a more open eye pattern and the dispersion of its constellation signal closer to the ideal point. It indicated more ISI occurs in the OFDM MIMO ZF system than that in OFDM MIMO STBC system.
ANALISIS KOORDINASI SETTING RELAY PENGAMAN AKIBAT UPRATING TRANSFORMATOR DI GARDU INDUK GIANYAR I P. G. Eko Putra; G. D. Arjana; C. G. I. Partha
Jurnal SPEKTRUM Vol 2 No 2 (2015): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.555 KB)

Abstract

Seiring dengan pertumbuhan beban yang semakin meningkat di Gardu Induk Gianyar maka transformator tenaga dengan kapasitas 30 MVA akan diganti dengan transformator yang berkapasitas 60 MVA untuk meningkatkan kontinyunitas aliran daya kepada konsumen melalui penyulang-penyulang. Pada uprating transformator yang sudah dilakukan, terjadi perubahan arus nominal pada sisi primer dengan nilai 230,94 A dan sisi sekunder 1.732 A, arus hubung singkat 3 phasa pada tegangan 150/20 kV dengan nilai 1.535 A dan 6.488 A dan arus hubung singkat 2 phasa pada tegangan 150/20 kV dengan nilai 749,148 A dan 1,329 A. Sedangkan nilai setting waktu di OCR pada sisi sekunder mendapatkan nilai 0,786 detik, pada sisi penyulang didapatkan hasil 0,37 detik dan pada sisi kopel dengan nilai setting 0,499 detik. Sedangkan nilai dari arus hubung singkat 1 phasa pada pengaman GFR 288,675 A dan nilai setting waktu pada sisi sekunder 2,083 detik dan pada sisi kopel sebesar 1,601 detik. Hasil grafik pada transformator 30 MVA dan 60 MVA mempunyai koordinasi setting pengaman yang baik karena tidak ada persilangan antara penyulang, kopel, sekunder, primer 150 kV. Pada grafik koordinasi setting relay OCR tersebut, yang menyebabkan koordinasi berjalan sempurna dengan nilai arus gangguan pada sisi sekunder 20 kV sebesar 5650 A dan 6720 A yang membutuhkan waktu untuk menangani gangguan 1,3 detik dan 1,2 detik dan nilai arus gangguan 2980 A dan 2310 A membutuhkan waktu untuk mengamankan gangguan 1,3 detik dan 1,7 detik.
ANALISIS KINERJA KOMBINASI SISTEM CODE DIVISION MULTIPLE ACCESS MULTIPLE INPUT MULTIPLE OUTPUT DENGAN KODE PENEBAR WALSH PADA KANAL RAYLEIGH FADING I Gd. Tri Dharma Prawira; I.G.A.K. Diafari Djuni Hartawan; N. Pramaita
Jurnal SPEKTRUM Vol 5 No 2 (2018): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.856 KB) | DOI: 10.24843/SPEKTRUM.2018.v05.i02.p36

Abstract

The increasing human population are same to the need for telecommunications. Code Division Multiple Access (CDMA) is one of the most widely used telecommunications technologies. But with the increasing number of users, this technology is no longer able to meet the needs of users. With the required capacity requirements, the CDMA system and Multiple Input Multiple Output (MIMO) technology are merged.To find out the performance of a combined CDMA MIMO system, the system was tested by increasing the number of users and Signal to Noise Ratio (SNR) where the spreading code used was the Walsh code and the channel used was Rayleigh Fading modeling. The reference value used as material for consideration are the value of Bit Error Rate (BER).The method used in testing the CDMA MIMO system is the increase number of users, starting with a single user up to 16 users and SNR values from -15 dB to a maximum of 15 dB.Where all users will be combined with the CDMA technique then it will be sent using MIMO technology. The system will be tested using a simulation of the MatLab R2012a software.The results of the simulation show the performance of the CDMA MIMO system when using SNR that is increasing high, the BER will be lower or better used for communication. Whereas for simulations using a user that increases it results in a BER value that is almost the same because of the nature of the orthogonal Walsh code so that each user does not experience interference with other users.
REKONFIGURASI JARINGAN SAMBUNGAN RUMAH UNTUK MENGURANGI RUGI-RUGI DAYA DAN JATUH TEGANGAN DI PERUMAHAN NUANSA KORI JIMBARAN I Gede Agus Handi Saputra; I Wayan Arta Wijaya; I Gst. Nrg. Janardana
Jurnal SPEKTRUM Vol 4 No 1 (2017): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (243.043 KB) | DOI: 10.24843/SPEKTRUM.2017.v04.i01.p09

Abstract

Perumahan Nuansa Kori Jimbaran disuplai oleh salah satu trafo distribusi KA1441 melalui Penyulang Jimbaran. Trafo KA1441 berlokasi di Perumahan Nuansa Kori Jimbaran dengan kapasitas 250 KVA. Jumlah seluruh pelanggan yang disuplai oleh trafo iniadalah 118 unit pelanggan dengan beban daya 450 VAhingga 2200 VA. Berdasarkan hasil pengukuran di dapat nilai tegangan terendah yaitu 176Volt lebih rendah dari tegangan sumber satu phasa ke netral (220 V) yang terjadi pada saat beban puncak dengandrop tegangan melebihi 5%. Sehingga perlu dilakukan rekonfigurasi pada jaringan di Perumahan Nuansa Kori Jimba-ran.Hasil analisis rekonfigurasi JTR (Jaringan Tegangan Rendah) dengan simulasi program ETAP Powerstation 7.5 yaitu di dapat nilai tegangan terendah sebesar 210 V atau drop tega-ngan ‘4,54% dari tegangan sumber 220 V dan rugi-rugi daya sebesar 5,6 kW. Nilai drop tegangan yang didapat setelah rekonfigurasi jaringansudah sesuai dengan standar (SPLN 72 Tahun 1987).
STUDI PROTEKSI DOUBLE BUSBAR AKIBAT PENAMBAHAN TRANSFORMATOR DI GARDU INDUK PEMECUTAN KELOD I Kadek Rogan Bayu Candra Dwipa; I Gede Dyana Arjana; Cok Gede Indra Partha
Jurnal SPEKTRUM Vol 6 No 4 (2019): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (226.988 KB) | DOI: 10.24843/SPEKTRUM.2019.v06.i04.p16

Abstract

Pemecutan Kelod Substation operated with four conductors, three transformers, one capacitor and one coupling with double busbar configuration, side by side with the Kapal and Pesanggaran substation to maintain electricity supply in Kuta, Legian, Seminyak, Denpasar City and surrounding areas. Due to increase in load in Denpasar area, PT PLN (Persero) Trans-JBJT added one transformer to improve the reliability of electricity in this substation, so Pemecutan Kelod substation operated with four transformers. To optimize the continuity of the power flow, it is necessary to analyse the relay settings on the busbar current and the appropriate protection settings as a protection system reference. In this study, the calculation of resistor stability (Rstab) of input current and output current after and before the addition of the transformer is carried out. The results of the calculation of resistor stability (Rstab) before the addition of the transformer is obtained with a total of 5.12 ?, the input current is 1030 A and the output current is 1010 A with losses of 1.9%. While the results of the calculation of resistor stability (Rstab) after the addition of the transformer is obtained with a total of 5.64 ?, the input current is 1070 A and the output current is 1060 A with losses of 0.9%. Those losses values complied with the SPLN No.1: 1987 standard for the 150 kV system.
RANCANG BANGUN PENGAMAN MOTOR INDUKSI 3 FASA TERHADAP UNBALANCE VOLTAGE DAN OVERLOAD DENGAN SISTEM MONITORING I.P. Sudiarta; .W.Arta Wijaya; I.G.A.P. Raka Agung
Jurnal SPEKTRUM Vol 2 No 1 (2015): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.121 KB)

Abstract

Motor induksi tiga fasa merupakan salah satu mesin listrik yang banyak digunakan di dunia industri. Sesuai dengan peran dan fungsinya, maka motor induksi tiga fasa dinilai sangat penting dalam dunia industri, sehingga motor induksi diharuskan bekerja dengan baik dan aman. Banyak sekali jenis-jenis gangguan yang berpotensi untuk mengganggu fungsi dan kerja motor atau bahkan merusak motor itu sendiri di antaranya yaitu unbalance voltage dan overload. Penelitian ini bertujuan membuat suatu alat yang bertugas untuk mengamankan motor induksi tiga fasa terhadap gangguan unbalance voltage dan overload berbasis mikrokontroller ATMega 328. Alat ini juga memiliki fitur monitoring yang dilakukan pada komputer.
ANALISIS PENAMBAHAN TRANSFORMATOR SISIPAN UNTUK MENGATASI OVERLOAD PADATRANSFORMATOR DB0244 DI PENYULANG SEBELANGA Kadek Wahyudi Widiatmika; I Wayan Arta Wijaya; I Nyoman Setiawan
Jurnal SPEKTRUM Vol 5 No 2 (2018): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (267.768 KB) | DOI: 10.24843/SPEKTRUM.2018.v05.i02.p03

Abstract

Penyulang Sebelanga berada di wilayah PT.PLN (Persero) Area Bali Selatan yang disuplai oleh Gardu Induk Pemecutan Kelod dengan kapasitas penyulang sebesar 280 A. Penyulang Sebelanga mensuplai tranformator DB0244 yang terbebani sebesar 103,4 % dengan kapasitas 250 kVA. Standarisasi pembebanan untuk sebuah transformator adalah sebesar 80% dari kapasitas transformator. Solusi untuk mengatasi permasalahan ini adalah dengan melakukan pemasangan transformator sisipan yang bertujuan untuk membagi beban dari transformator DB0244. Berdasarkan data PT. PLN (Persero) Area Bali Selatan tahun 2017 peningkatan penggunanan energi listrik di kota Denpasar setiap tahunnya adalah sebesar 8,3%. Maka dengan menggunakan transformator sisipan yang berkapasitas 250 kVA, dimana persentase pembebanan awal sebesar 26,8% akan dapat melayani peningkatan penggunaan energi listrik selama lima tahun kedepan dengan total persentase pembebanan setelah lima tahun adalah sebesar 68,3%.

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