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Jurnal SPEKTRUM

spektrum
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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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AUDIT ENERGI UNTUK PENCAPAIAN PENGHEMATAN PENGGUNAAN ENERGI LISTRIK DI PT. GRAHA SARANA DUTA II DENPASAR Sylvi Oktavia Ginting; Ida Bagus Gede Manuaba; A A Gede Maharta Pemayun
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Energy audit is a technique used to determine the amount of energy use in a buildingand to find various energy-saving solutions or opportunities. In this study, the energy audit wasconducted at PT. Graha Sarana Duta II Denpasar which is located on Jl. Serma Gede No. 13,Dauh Puri Klod, Denpasar. Based on the existing conditions, the level of Energy ConsumptionIntensity (IKE) obtained before the audit was carried out was 245.22 kWh/m2/year or 20.43kWh/m2/month which according to ESDM No. 13/2012, Air-conditioned buildings are in thewasteful category. In this study, the energy audit focuses on the lighting system and airconditioning system. The method used in this research is to calculate and analyze theconsumption of electrical energy in the lighting system and air conditioning system. After doingthe research, it can be seen the energy saving opportunities (PHE) in PT. Graha Sarana Duta IIDenpasar by replacing the TL and SL lamps using LED lamps and requiring room users to turnoff the air conditioner when the room is not in use, the result is savings 11,4% in electricalenergy use, where the IKE after the audit is 18.1 kWh/m2/month. The office can also save thecost of using electrical energy, which is Rp. 3,170,394,- every month.

APLIKASI MARKETPLACE BERBASIS SISTEM PENDUKUNG KEPUTUSAN UNTUK PEMESANAN DAN PEMASANGAN IKLAN PADA BILLBOARD DI KOTA DENPASAR I Made Dedi Pradnya Iswara; I Made Arsa Suyadnya; Putu Arya Mertasana
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Billboards are a great form of outdoor advertising. Billboards containing text or images ofinformation promoting a product are usually taken by the advertising agency. Advertisingcompanies promote curated billboards using individual websites, requiring clients to switchbetween sites to get billboards that meet the criteria. The purpose of marketplace creation is toavoid customers having to switch sites for billboards that meet the criteria. The marketplace isbuilt using Laravel 7 framework with additional features of a business intelligence system tohelp customers get billboards based on their criteria. The decision support system uses aweighted accumulation method that uses multiplication to relate the scoring criteria, where thescore of each criterion will be increased by the weight of the related criteria. The use of adecision support system with a weighted product approach as a support function on a marketsite is the use of a decision support system as a recommendation for the application market.The result of this research is that a web-based marketplace with a decision support system hasbeen successfully built using the Laravel 7 framework and MySQL DBMS. Based on the blackbox tests performed on the app, it performs according to its function and based on theoreticalcomparison testing related to the use of the weight product method, the results of therecommendations on the billboard application are in accordance with manual calculations.

PERANCANGAN PLTS ATAP DI KAMPUS SEKOLAH TINGGI ILMU EKONOMI WIDYA GAMA LUMAJANG Krisda Bimas Permada; I Nyoman Setiawan; I Wayan Arta Wijaya
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Rooftop solar power plant is energy that utilizes solar energy as anenergy source which is then converted into electrical energy as well as analternative to environmentally friendly electricity generation. Rooftop solar power plants can beinstalled on the roofs of large buildings,the roof of the STIE Widya Gama campus with an areaof 2698.4 m2. Rooftop solar power plant aims as an additional power supply to supply electricalpower to the Sekolah Tinggi Ilmu Ekonomi Widya Gama Lumajang campus of 53 kVA installedpower on transformer 1. The design of a rooftop solar power plant at the STIE Widya GamaLumajang Campus uses 100 solar modules of type Vertex TSM-DE18M(II) 500 Wp. Inverterwith a capacity of 53 kVA as much as 1 unit type SUNNY TRIPOWER CORE1.solar power plants produce electrical energy of 82322,2 kWh/year to supply theload on STIE Widya Gama Lumajang. Initial investment capital of Rp. 567.005.500maintenance and operation costs of 1% of the investment capital cost of Rp.5.670.055 and payback periode for 14 years 6 months if inflation in Indonesia is4.25%.

ANALISA PERENCANAAN PEMBANGKIT LISTRIK TENAGA SURYA SEBAGAI ENERGI PENGGERAK POMPA MINYAK PADA STASIUN PENGISIAN BAHAN BAKAR UMUM DI KOTA DENPASAR I Putu Juliawan; I Nyoman Setiawan; I Wayan Sukerayasa
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Utilization of renewable energy as a source of electrical energy is an environmentallyfriendly energy development, one of which is the use of solar energy by developing solar PV onthe roof of buildings as a medium for installing solar modules. In this study, a rooftop solar PVplan was carried out at the Nangka Utara gas station as a source of electrical energy whichaims to reduce the cost of PLN electricity bills. The rooftop solar PV system at the Nangka Utaragas station uses an On-grid solar PV system without batteries, using 36 units of 415 Wpmonocrystalline solar modules and one 15kW inverter unit. Planning for rooftop solar PV of theNangka Utara gas station with a capacity of 14.9 kWp with the resulting energy production of20.43 MWh per year. The initial investment cost required is IDR. 101.179,000 with a paybackperiod of 5 years and 8 months.

TOEFL (TEST OF ENGLISH AS A FOREIGN LANGUAGE) TEST PLUGIN UNTUK MOODLE Leovin Leovin; Ni Made Ary Esta Dewi Wirastuti; Komang Oka Saputra
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

TOEFL (Test of English as a Foreign Language) is a test used to measure a person'sEnglish proficiency. Generally, the TOEFL test is used as one of the requirements to graduateat domestic universities, to enter universities abroad, or to work in a country. In this research,the LMS (Learning Management System) was used for implement the TOEFL. LMS is anapplication system that was developed specifically to manage online class (e-learning), andshare subject matter. Moodle (Modular Object-Oriented Dynamic Learning Environment) is anLMS that is usually used in online learning activities. The results of this research that theTOEFL was successfully created as a Moodle plugin and according to the SUS (SystemUsability Scale) test that has been calculated, it got a score of 89, indicating this application hasa high level of feasibility.

PERENCANAAN PEMBANGKIT LISTRIK TENAGA SURYA DI TEMPAT OLAH SAMPAH SETEMPAT WERDI GUNA DESA GUNAKSA KABUPATEN KLUNGKUNG I Putu Dedi Wiriastika; I Nyoman Setiawan; I Wayan Sukerayasa
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

The use of renewable energy is a solution in the application of clean andenvironmentally friendly energy, one of which is the use of solar power with the PLTS system. Inthis study, the PLTS system planned at TOSS Werdi Guna is a PLTS-On Grid system without abattery with a ground mounted installation, the aim is to reduce the cost of electricity bills. PLTSplanning at TOSS Werdi Guna has a capacity of 32.6kWp with a number of 86 modules anduses 1 inverter unit with a capacity of 33kW. The energy production produced by PLTS for ayear is 52,955kWh. The total investment cost required is IDR 580,469,095 with a paybackperiod of 7 years and 4 months.

COMPETITION-BASED GROUP QUIZ UNTUK LEARNING MANAGEMENT SYSTEM MOODLE “Prama Ade Prayitno; Komang Oka Saputra; Ni Made Ary Esta Dewi Wirastuti
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Quizzes are used by teachers in the learning evaluation process which aims todetermine the extent of mastery of the material provided by the teacher to students. The quizconsists of several items about which are carried out directly by students. In this study, thisresearch was carried out online by students in groups using a Learning Management System(LMS), namely Moodle with the help of a plugin. The result of the work is that the availability ofthe current score only produces 1 and then these values are to be developed for each studentin the same group. This resulted in the evaluation process of learning in the quiz to be less fairBased on this problem, a plugin that can process is created that can process from workbased on personal views generated by students. The personal score is then used to calculatethe score by taking the average of all students in the group. Furthermore, the final valueobtained from the calculation of the ratio of personal values to group values. This final score willbe used to evaluate learning in the use of quizzes using Moodle. The results of the study aftertesting the system usability scale (SUS) showed that plugins that had good feasibility andblackbox testing methods declared the plugin well.

REKONFIGURASI PENYULANG KINTAMANI UNTUK MENURUNKAN.RUGI-RUGI.DAYA.DAN JATUH TEGANGAN PADA WILAYAH KERJA ULP BANGLI Putu Juliartawan; I Nyoman Setiawan; I Wayan Arta Wijaya
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

The Kintamani supplay is uone of the feedersl in the PT PLN (Persero) UP3 East Bali Work Areawhich is the responsibility of ULP Bangli. This feeder uses a loop type configuration that servesconsumers in the Penelokan, Songan, Kintamani, Writing, Catur and Sukawana areas. This feederhas a channel length of 237,886 kms with a total distribution substation of 183 transformer units andthe peak load of this feeder reaches 3,160 kW. This condition causes a voltage drop of 7.68% andpower losses of 7.5%. The reconfiguration of this feeder is done by cutting the network which istransferred to Nandini's feeder. Reconfiguration by cutting the network shows an improvement in thevoltage of the Kintamani feeder which initially dropped from 7.68% to 3.27% and decreased powerlosses from 7.5% to 4.81%. Improvements in voltage and power losses that occur in this feederchange the value of the voltage drop and power losses on the Nandini feeder, which has an increasein the percentage of voltage drop from (-)1.44% to 1.27% and losses the initial power of 0.5% to2.10%. With this the Kintamani feeder is right for reconfiguration with the Nandini feeder. Thus, for theKintamani feeder and the Nandini feeder, it is in accordance with the 2017-2022 Distribution SystemMaster Plan Manual, where the maximum allowable voltage drop is a maximum of 19kV and amaximum power loss of 5%.

PENGARUH BESARAN HAMBATAN PEMBUMIAN TITIK NETRAL TERHADAP THD DI GEDUNG KAMPUS W G Yoga Ananta Wijaya; I G N Janardana; I B Gede Manuaba
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

The quality of electric power is influenced by harmonic factors that occur due to animbalance in the load on the power system. This load imbalance results in a current at theneutral point. This amount of current can cause equipment damage and loss of electrical power.Therefore, an earthing system is needed to parse the current flowing at the neutral point and asa safety for the electric power system in a building. The objective of this research was to specifythe impact of the grounding resistance value of the neutral point on the current THD on theMDP installed during peak load conditions at the Electrical Engineering Campus of UdayanaUniversity in Jimbaran. This research method uses simulation with Simulink Matlab software todetermine the effect of neutral point grounding resistance on current THD in areas withcalcareous soils. The simulation outputs indicate that the value of the earth resistance affectsthe THDi value in the electrical system. The simulation outcomes represent that when the earthresistance value is 5 , the THD of the R, S, and T phase currents is feasible at 17.55%, 19.42%, and 8.86%. Then when the resistance value is lowered by 0.5, the THD of the R, S, T phasecurrents is feasible 17.20%, 17.35%, and 8.79%. This shows that more slight the earthresistance number, the smaller the current THD value.

SISTEM PENDETEKSI WAJAH DENGAN METODE VIOLA JONES MENGGUNAKAN ESP32-CAM I Made Yudi Candra Putra; I Made Oka Widyantara; I Gusti Agung Komang Diafari Djuni H
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Increased security in rooms that are confidential or require high privacy, is very muchneeded. One way to increase this security is to use a security system that utilizes the biologicalcharacteristics of facial images that are owned by every human being. The biologicalcharacteristics of human facial images can be a solution for security systems in the roombecause human facial images are difficult to imitate and modify by others. This study aims toimplement a security system for detecting human face images using the Viola Jones methodwith the Haar Classification Feature. The Viola Jones method with the Haar Classificationfeature is suitable as a good visual recognition when detecting facial images via the ESP32-Cam microcontroller and for streaming video using a OV2640 camera. The test results in thisstudy showed that of the 4 objects used in human face images, the ideal distance whendetecting facial images was 30 cm, with a 100% success rate. While the level of slope tolerancethat has been detected is a maximum with a slope of 30° to the position of the face facingstraight ahead.

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Nyoman Gunantara

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gunantara@unud.ac.id

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+6281558140279

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gunantara@unud.ac.id

Editorial Address
Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315

Location
Kota denpasar,

Bali

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Nyoman Gunantara

Contact Email gunantara@unud.ac.id

Phone +6281558140279

Journal Mail Official gunantara@unud.ac.id

Editorial Address Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315

Location Kota denpasar, Bali INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Nyoman Gunantara

Contact Email
gunantara@unud.ac.id

Phone
+6281558140279

Journal Mail Official
gunantara@unud.ac.id

Editorial Address
Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315

Location
Kota denpasar,

Bali

INDONESIA