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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 Pembangkit Listrik Tenaga Surya Atap Gedung Sekolah di Kota Denpasar H. Kristiawan; I.N.S. Kumara; I.A.D. Giriantari
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 (138.063 KB) | DOI: 10.24843/SPEKTRUM.2019.v06.i04.p10

Abstract

Solar Power Generation System (PLTS) is a power generation system that utilizes sunlight as a renewable energy source and a rooftop as a place for solar panels. This paper presents the results of a study of the potential of a rooftop-based solar power plant in the city of Denpasar by taking a location on the roof of the SD Negeri 5 Pedungan Diponegoro No. 60 Denpasar road using PLTS objects that have been installed. The study was carried out with the help of Heliospoce software. Based on the study, information was obtained that the potential of solar energy was 1912.8 kWh / m2 / year or an average of 5.2 kWh / m2 / day in the city of Denpasar. Sunlight that can produce electricity starts at 07.00 -18.30 WITA. The installed energy potential of PLTS is 3214.6 kWh with an angle corresponding to the roof angle of 30.96o. The result of the potential energy produced will be greater if the installation of PV uses the optimal angle (15o) that is equal to 3407kWh.
ANALISA SETTING RELAI PENGAMAN AKIBAT REKONFIGURASI PADA PENYULANG BLAHBATUH I K. Windu Iswara; G. Dyana Arjana; W. Arta Wijaya
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 (296.024 KB)

Abstract

Penyulang tegangan menengah merupakan saluran yang menghubungkan sumber daya listrik dari gardu induk ke konsumen, di dalam pendistribusian sumber daya listrik di jaringan 20 kV seringkali menyebabkan terputusnya pasokan daya listrik ke pelanggan. Salah satunya sistem pengaman relai pada penyulang. Seperti yang terjadi pada penyulang Blahbatuh perlu dianalisa setting relai pengaman sebelum dam sesudah rekonfigurasi yang dibandingkan dengan data di lapangan. Mencari arus gangguan hubung singkat menggunakan aplikasi Electrical Transient Analisys Program Power Station (ETAP). Hasil analisa mendapatkan arus gangguan hubung singkat sebelum rekonfigurasi jaringan sebesar 9.389 A dan setelah rekonfigurasi jaringan sebesar 9.381 A. Hasil yang diperoleh nilai setting relai sebelum rekonfigurasi dari nilai setting over current relay (OCR) pada pangkal penyulang sebesar 271,2 A dan TMS 0,157 SI, sedangkan hasil yang diperoleh nilai setting relai setelah rekonfigurasi dari nilai setting over current relay (OCR) pada pangkal penyulang sebesar 226,8 A dan TMS 0,170 SI. Hasil yang diperoleh nilai setting relai sebelum rekonfigurasi dari nilai setting ground faulth relay (GFR) pada pangkal penyulang sebesar 25 A dan TMS 0,107 SI, sedangkan Hasil yang diperoleh nilai setting relai setelah rekonfigurasi dari nilai setting ground faulth relay (GFR) pada pangkal penyulang sebesar 23,6 A dan TMS 0,109 SI.
ANALISIS INTERCARRIER INTERFERENCE (ICI) SISTEM OFDM-MIMO STBC PADA KANAL FREQUENCY SELECTIVE FADING I Wayan Diki Andriasmika; I.G.A.K. Diafari Djuni H; N.M.A.E. Dewi Wirastuti
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 (255.105 KB) | DOI: 10.24843/SPEKTRUM.2019.v06.i01.p13

Abstract

Wireless telecommunications requires high-speed access. One technique used tooWireless telecommunications requires high-speed access. One technique used toovercome multipath fading is Ortoghonal Frequency Division Multiplexing (OFDM). Theweakness of OFDM occurs on the mobile channel due to time variations in the channel, givingrise to intercarrier interference (ICI). The aim of the study is to determine the effect ofnormalized carrier frequency offset on ICI and the effect of frequency selective fading tapchannel. The simulation results show the system performance in calculating the Eb / N0 5 dBvalue that the greater the normalized carrier frequency offset (?), the worse the signal. Thesimulation results show the OFDM-MIMO system performance in calculating the Eb / N0 5 dBvalue that the greater the tap on the channel the worse the signal.vercome multipath fading is Ortoghonal Frequency Division Multiplexing (OFDM). Theweakness of OFDM occurs on the mobile channel due to time variations in the channel, givingrise to intercarrier interference (ICI). The aim of the study is to determine the effect ofnormalized carrier frequency offset on ICI and the effect of frequency selective fading tapchannel. The simulation results show the system performance in calculating the Eb / N0 5 dBvalue that the greater the normalized carrier frequency offset (?), the worse the signal. Thesimulation results show the OFDM-MIMO system performance in calculating the Eb / N0 5 dBvalue that the greater the tap on the channel the worse the signal.
SISTEM PENDUKUNG KEPUTUSAN SELEKSI ATLET TARUNG DERAJAT DENGAN METODE PROMETHEE I Putu Arya Putrawan; Made Sudarma; I Made Arsa Suyadnya
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 (760.433 KB) | DOI: 10.24843/SPEKTRUM.2017.v04.i02.p16

Abstract

Tarung Derajat is a martial art that has existed for a long time in Indonesia. Someone who wants to be an Tarung Derajat athlete must participate in the athlete selection. So far there is no system that facilitates the selection of Tarung Derajat athletes so that the selection process is more time-consuming, prone to error and nepotism. To prevent this, in this study built a decision support system using PROMETHEE method to assist the Tarung Derajat athletes selection process. This decision support system is built with web-based programming using PHP programming language and MySQL database. With success rate up to 90,66% in usability test, can be concluded that Decision Support System of Tarung Derajat Athletes Selection can support the athletes selection process.
EVALUASI UNTUK MENGATASI BEBAN LEBIH PADA PENYULANG BATU BELIG K.H. Priadi; R.S. Hartati; I.W. Sukerayasa
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 (303.354 KB)

Abstract

Penyulang Batu Belig merupakan penyulang dengan konfigurasi tipe radial, dengan 109 trafo distribusi, total daya terpasang 19.175 KVA. Pada tahun 2013 beban puncak penyulang Batu Belig sebesar 284 A dan standar maksimal pembebanan suatu penyulang 240 A (80% dari 300 ampere). Mengatasi beban lebih pada penyulang Batu Belig, perlu dilakukan rekonfigurasi jaringan distribusi. Rekonfigurasi jaringan distribusi dapat dilakukan dengan dua skenario : skenario 1 dengan mengalihkan sebagian beban penyulang Batu Belig ke penyulang terdekat, yaitu penyulang Mertanadi dan Uma Alas. Skenario 2 dengan memotong beban penyulang Batu Belig menjadi dua, sehingga didapat penyulang Batu Belig 1 dan penyulang Batu Belig 2. Penyulang Batu Belig 2 akan dialihkan ke penyulang baru, yang ditarik dari gardu induk terdekat, yaitu Gardu Induk Padang Sambian dan Gardu Induk Pemecutan Kelod. Setelah dianalisis solusi terbaik untuk mengatasi beban yang sudah kritis pada penyulang Batu Belig dengan rekonfigurasi skenario 2, yaitu penyulang Batu Belig 2 dengan sumber gardu induk Pemecutan Kelod (trafo III/ 60 MVA) mengunakan kabel tanam (AL XLPE 240 mm2). Menggunakan kabel tanam didapat persentase losses sebesar 2,5% dan persentase drop tegangan sebesar 1,63%, untuk standar losses yang diijinkanl adalah 5,24% [1], dan drop tegangan pada tipe radial yang diijinkan tidak boleh lebih dari 5% [2].
Analisis Pengaruh Nilai Resistansi untuk Pentanahan Kawat Netral Terhadap THD Arus di Fakultas Teknik Universitas Udayana – Sudirman I G.N Nanda Ramdipa Amerta; I Wayan Rinas; I G.N Janardana
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 (321.723 KB) | DOI: 10.24843/SPEKTRUM.2018.v05.i02.p21

Abstract

Harmonics is a periodic sine wave distortion, due to the operation of nonlinear loads. Har-monics causes current to flow in the neutral wire even though in a balanced load condition, in addition to harmonic load imbalance problems will increase the current flowing in the neutral wire, making it dangerous for the electrical system. This research was using electrical system modeling simulation in MATLAB application by changing the earth resistance value to see the effect of earth resistance value to Total Harmonic Current Distortion (THDi), it is necessary to analyze the effect of resistance value for THDi neutral wire grounding. This study uses the Fast Fourier Transform (FFT) method. THDi simulation results when the conditions of the resistance value is 9 ?, THDi percentage in phase R is 6.30%, Phase S is 2.86%, Phase T is 2.50%. When the earth resistance value is 5 ?, the percentage of THDi decreases with the value in phase R is 6.09%, Fasa S is 2.61%, Fasa T is 2.48%. When the earth resistance value is 2 ?, the THDi percentage in the R phase is 5.85%, Fasa S is 2.09%, Fasa T is 2.22%. Based on the simulation results it is known that the smaller the earth resistance value, the smaller the harmonic distortion in the electrical system.
RANCANG BANGUN APLIKASI ANTIVIRUS KOMPUTER DENGAN MENGGUNAKAN METODE SECURE HASH ALGORITHM 1 (SHA1) DAN HEURISTIC STRING I Gusti Made Panji Indrawinatha; Made Sudarma; I Made Arsa Suyadnya
Jurnal SPEKTRUM Vol 3 No 2 (2016): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (277.585 KB)

Abstract

Virus komputer merupakan perangkat lunak berbahaya yang dapat merusak data dan menggandakan diri pada sistem komputer. Untuk mendeteksi dan membersihkan virus dari sistem komputer, maka dibuatlah aplikasi antivirus. Dalam mendeteksi berbagai jenis virus sebuah aplikasi antivirus biasanya menggunakan beberapa metode. Pada penelitian ini akan membahas perancangan sebuah aplikasi antivirus menggunakan metode Secure Hash Algorithm 1 (SHA1) dan heuristic string sebagai metode pendeteksian virus. Dari pengujian yang dilakukan diperoleh hasil dimana saat tidak menggunakan heuristic, antivirus hanya mendeteksi 12 file dari 34 file sample virus atau memiliki tingkat akurasi pendeteksian sebesar 35%. sedangkan saat menggunakan heuristic, antivirus berhasil mendeteksi 31 file dari 34 file sample virus atau memiliki tingkat akurasi pendeteksian sebesar 91%.
OPTIMASI PENEMPATAN DAN KAPASITAS KAPASITOR UNTUK MEMINIMALKAN SUSUT DAYA PADA PENYULANG TABANAN DENGAN MENGGUNAKAN METODE ANT COLONY OPTIMIZATION (ACO) Fadil Arialdi; Rukmi Sari Hartati; I Made Mataram
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 (268.048 KB) | DOI: 10.24843/SPEKTRUM.2019.v06.i04.p1

Abstract

Electricity is one of the needs of society that must be met, because electricity is very instrumental in helping everyday life, such as lighting, and for the electronic needs. In distributing power to consumers there is a power loss in the distribution system channel. To reduce power loss, it is necessary to install capacitors. This study aims to reduce power losses in Tabanan feeders using the Ant Colony Optimization (ACO) method with 10 attempts using MATLAB. The total power loss before the capacitor is installed is 0.421 MW (6,4%), after the analysis is obtained the placement of the capacitor located on bus 10 with a capacity of 1000 KVAR, can reduce the power loss to 0.145 MW (2,2%)
AUGMENTED REALITY BERBASIS ANDROID UNTUK PENGENALAN PERALATAN LABORATORIUM I Kadek Arya Wiratama; Duman Care Khrisne; Made Sudarma
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 (393.717 KB) | DOI: 10.24843/SPEKTRUM.2018.v05.i01.p13

Abstract

To gift a chance to students, lab learning is a learning process that supervised practical application with practical tools of a previously studied theory. Lack of lab clerk and time, causing lack of understanding of using tools when practical process. This study aims to assist the introduction phase of practicum tools, with Augmented reality technology, built on unity3D, Vuforia and blender with marker in the form of Augmented reality Book (AR book). From test refound that marker detection at best performance when marker is build at A4 paper size with color information and maximum of 3 closed marker area. Testing with System Usability Scale tested by Electrical Engineering Study Program students got best score at statement point 1,7 and 9
PROTOTIPE PEMBERI PAKAN IKAN DAN PENGGANTIAN AIR PADA AKUARIUM BERBASIS MIKROKONTROLER ATMEGA328P Anak Agung Arta Darmika; I Gusti Agung Putu Raka Agung; Yoga Divayana
Jurnal SPEKTRUM Vol 6 No 2 (2019): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.762 KB) | DOI: 10.24843/SPEKTRUM.2019.v06.i02.p11

Abstract

Technological developments have encouraged many human lives in automatic matters. One of the uses of the rapidly developing electronics field is the application of household appliances. This study will be made a prototype of fish feed and water replacement in the aquarium of ATmega328P microcontroller based. This prototype aims to facilitate feeding of fish and replacing water in the aquarium. The sensor reading is using an ultrasonic sensor to control the amount of fish feed which when the feed runs out will be marked with a buzzer that lights up. The system for regulating fish feeding and replacement of water is regulated by the DS1307 Real Time Clock IC with a display in a 20x4 cm LCD. A valve opening for fish feed containers uses a servo motor. The program used in designing this prototype is to use the C Programming Language. The results achieved in this study are fish feed schedules and water changes can be arranged with a switch button with a twice daily feeding schedule and water replacement every three days. Another condition that is achieved is the servo motor and the water drain pump can work according to the schedule of the time that has been arranged. The conclusion of this research is that the prototype of fish feed and water replacement can already be implemented using the ATmega328P microcontroller. The fish feeder prototype can realize wave reflections from the ultrasonic sensor when the feed has run out, and it will automatically move the servo motor to open the valve, and the buzzer will sound if the fish feed is below 20%.

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