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All Journal Buletin Udayana Mengabdi Jurnal SPEKTRUM Jurnal Ilmiah Kursor INTECOMS: Journal of Information Technology and Computer Science Journal of Electrical, Electronics and Informatics International Journal of Engineering and Emerging Technology Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) Journal of Law and Social Politics Jurnal SPEKTRUM

A.A Ngurah Amrita

Department Of Electrical Engineering, Udayana University, Denpasar

Author-ID : 2927275

Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Mechanical Engineering Social Sciences

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Study of Transformer Lifetime Due to Loading Process on 20 KV Distribution Line A.A.N. Amrita; W.G. Ariastina; I.B.G. Manuaba
Journal of Electrical, Electronics and Informatics Vol 2 No 2 (2018): JEEI (August 2018)
Publisher : Institute for Research and Community Services Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JEEI.2018.v02.i02.p01

Power transformer is very important in electric power system due to its function to raise or lower the voltage according to its designation. On the power side, the power transformer serves to raise voltage to be transmitted to the transmission line. On the transmission side, the power transformer serves to distribute the voltage between the main substations or down to the distribution voltage. On the distribution side, the stresses are channeled to large customers or lowered to serve small and medium customers. As the power transformer is so importance, it is necessary to protect against disturbance, as well as routine and periodic maintenance, so that the power transformer can operate in accordance with the planned time. Some factors that affect the duration of the power transformer is the ambient temperature, transformer oil temperature, and the pattern of load. Load that exceeds the maximum efficiency of the transformer which is 80% of its capacity will cause an increase in transformer oil temperature. Transformer oil, other than as a cooling medium also serves as an insulator. Increasing the temperature of transformer oil will affect its ability as an isolator that is to isolate the parts that are held in the transformer, such as iron core and the coils. If this is prolonged and not handled properly, it will lead to failure / breakdown of insulation resulting in short circuit between parts so that the power transformer will be damaged. PLN data indicates that the power transformer is still burdened exceeding maximum efficiency especially operating in the work area of PLN South Bali Area. The results of this study, on distribution transformers with different loads, in DS 137, DS 263 and DS 363, show that DS 363 transformer with loading above 80% has the shortest residual life time compared to DS 263 and DS 137 which loading less than 80%.

Developing TAMEx Model For Availability Aspect of E-Exam Security in WLAN Environment Gede Sukadarmika; Rukmi Sari Hartati; Linawati .; Nyoman Putra Sastra; A.A.N. Amrita
International Journal of Engineering and Emerging Technology Vol 5 No 1 (2020): January - June
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2020.v05.i01.p07

The internet has provided tremendous impact in educational development throughout the world. E-Exam system is one of educational component which has been used increasing dramatically for evaluating educational process. As an e-exam feature, uniformity of system access and time duration of the exam to all examinees is very important to be considered. Exam manager usually utilizes a fixed network to connect all e-exam terminal in order to maintain service stability on e-exam systems. However, the use of a fixed network will be difficult to be implemented if the number of examines is large. There are not many Education institutions have adequate ICT infrastructure or e-exam terminals for all students. Most institutions develop WLAN networks as an alternative to being able to provide ICT services to all students. With the development of mobile device technology (Handphone or Laptop) that strongly supports the learning process through mobile devices. This research aims to develop application of the Time Adaptive for Mobile E-Exam (TAMEx) Model. It serves to maintain the reliability of e-exam implementation on WLAN networks. The possible connection disruptions is anticipate by seeking time compensation only to participants who has experienced the connection problem. The time compensation must be accordance to the duration of the occurrence of connection loss. Application development has been carried out and is functioning properly. The report of application shows that it has succeeded in identifying the connection disturbance duration and provide time compensation to the proper examinee.

IMPLEMENTASI SISTEM PEMANTAUAN SUHU DAN KELEMBABAN UDARA BERBASIS IOT PADA PLANT FACTORY KEBUN PERCOBAAN FAKULTAS PERTANIAN UNIVERSITAS UDAYANA I Nyoman Agus Junaedi; Anak Agung Ngurah Amrita; I Nyoman Setiawan
Jurnal SPEKTRUM Vol 9 No 2 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Plant factory is a technological development in agriculture that is able to overcome the decline in productivity in the agricultural sector caused by limited agricultural land. The concept of the plant factory itself is the application of a good environmental condition for plants to grow indoors which is easy to control so that they are not affected by the weather outside. The temperature and humidity in the plant factory must be monitored and controlled in real time with an Internet of Things (IoT) technology that utilizes internet connectivity to connect and transmit data. The system is designed using two microcontrollers, namely Arduino nano which functions as an input reader for temperature and humidity sensors, namely the DHT22 sensor, while ESP32 functions as a module for sending DHT22 sensor data to the Blynk via an internet connection to be stored in the database and can be accessed via the smartphone user. The ESP32 also functions as an automatic control of air humidity and air conditioning (AC) control remotely via a smartphone.

IMPLEMENTASI SISTEM PEMANTAUAN KUALITAS AIR DENGAN IOT DI PLANT FACTORY KEBUN PERCOBAAN FAKULTAS PERTANIAN UNIVERSITAS UDAYANA I Putu A.B. Artha Wiraguna; I Nyoman Setiawan; Anak Agung Ngurah Amrita
Jurnal SPEKTRUM Vol 9 No 2 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Plant Factory is a technological concept that forms an ideal environment for plant growth. Water quality has several factors including pH value, water nutrient level (ppm), water temperature and others, plants require a pH value of 5.5 to 6. Differences in pH values and plant nutrients affect plant growth. Lettuce Cultivation has different nutrient requirements for water where plants need around 1000-2000 ppm and 20-25°C in order to produce good growth. Therefore we need a system that can regulate and monitor water quality that can be monitored anywhere. Based on system testing that has been carried out for 30 days, it is found that all components used function as expected, the water quality monitoring sensor is able to detect the value of pH, TDS, water temperature with an average difference with measuring instruments below 2%. After being tested for 30 days from planting to harvesting, the tool can still function properly with indicators that this tool can record data for 30 days and store all data in the database accurately.

IMPLEMENTASI SISTEM PEMANTAUAN INTENSITAS CAHAYA DENGAN IOT DI PLANT FACTORY KEBUN PERCOBAAN FAKULTAS PERTANIAN UNIVERSITAS UDAYAN Aveliano Tandrianto; I Nyoman Setiawan; A. A. Ngurah Amrita
Jurnal SPEKTRUM Vol 9 No 2 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Plant factory is a plant warehouse with a closed planting maintenance system which is expected to overcome the problem of pest attack and disturbance of climatic factors. In this study, an IoT-based light intensity monitoring system has been designed at the Plant Factory, Experimental Garden, Faculty of Agriculture, Udayana University. To monitor the value of the LED light intensity. The hardware used in this study uses 2 microcontrollers, namely arduino nano and ESP 32, using a BH1750 sensor to measure the intensity of light lux and using RTC to calculate the time on the device. All hardware components are assembled in parallel and become an IoT system, which is one way to be able to carry out automatic monitoring and control of lights that can be done anywhere. Monitoring with IoT at the plant factory using the internet which can be accessed through the blynk application. With this technology, it is expected to be able to regenerate farmers in the future to farm using IoT technology, the concept of hoeing and plowing, becoming more modern farming.

ANALISIS RELOKASI PEMBANGKIT LISTRIK TENAGA SURYA ON-GRID KAPASITAS 75 kWp DI SMKN 1 DENPASAR Agus, M.N.; Gunawan, J.N.; Amrita, A. A. N.; Hartati, R. S.
Jurnal SPEKTRUM Vol 11 No 2 (2024): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

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

The solar energy potential in Bali ranges from 4.01 to 6.13 kWh/m²/day, with an average increase of 4.89 kWh/m²/day. For solutions and innovations in energy development from unlimited resources, the use of new renewable energy such as natural sources like the sun is being explored. The utilization of renewable energy sources in the production of electricity and the decision of the Minister of Energy and Mineral Resources, Ministerial Regulation ESDM No. 49 of 2018, concerns the use of rooftop solar energy systems by consumers of PT PL).. The presence of the PLTS Rooftop at SMKN 1 Denpasar has garnered attention for further analysis regarding the installed PLTS. The performance of the PLTS Rooftop system at SMKN 1 Denpasar is analyzed using PVSyst software to view production potential, then calculate performance parameters of the PLTS system compared to the production results during one year of operation. The relocation design of the rooftop PLTS was carried out using PVSyst software, and then the performance parameters in the new building were calculated. Based on the analysis, the rooftop PLTS at the building before relocation produced an energy output of 124,347 kWh/Year with a performance ratio of 85.6%. For the building after relocation at SMKN 1 Denpasar, the energy output of the PLTS is 133,977 kWh/Year with a performance ratio of 85.7%.

Design Web Dashboard Monitoring Plant Factory Experimental Garden Faculty Of Agriculture, Udayana University Suartama, Putu Dandy; Amrita, Anak Agung Ngurah; Khrisne, Duman Care
Journal of Law and Social Politics Vol. 1 No. 3 (2023): Journal of Law and Social Politics
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/jlsp.v1i3.26

Information technology is now always experiencing a rapid increase in its use, one example is the website. Website is a collection of web pages, summarized in a domain, which is located in the World Wide Web (WWW) on the internet. This information media is useful in various fields, one of which is in agriculture. Where the information provided can help farmers in providing better results. One of the problems in agriculture that can be seen is related to the tropical climate in Indonesia. This greatly affects environmental conditions and can cause farmers to experience crop failure. One solution that can be done in this scope is with a plant factory. Where the plant factory is a technological concept that facilitates the formation of the right and good environment for plant growth, easy to control, does not require large land and is applied indoors. In its application, the plant factory still has shortcomings related to its information media. In this study, a monitoring website dashboard was designed to function as a medium of information on the plant factory. In system design, where the website is built using several components such as HTML, PHP, MySQL and Laravel Framework. To determine the performance of the system, testing is carried out with the black box method which aims to test on application details such as the appearance of the application, functions in the application, and the suitability of the function flow with the desired process then with the system usability scale (SUS) method. Where the measurement of the quality of web-based information systems, to evaluate the level of user satisfaction with the system services.

Rancang Bangun Purwarupa Pengusir Burung Otomatis Dengan Memanfaatkan IoT dan Sumber Energi Surya di Gardu Induk Nusa Dua Priambodo, Saga; Havivi, Hoirur Rosiqin; Amrita, Anak Agung Ngurah; Shandyasa, I Wayan
INTECOMS: Journal of Information Technology and Computer Science Vol. 8 No. 4 (2025): INTECOMS: Journal of Information Technology and Computer Science
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/2gfkwh53

Keberadaan gardu induk dalam sistem tenaga listrik mutlak diperlukan. Gardu induk sendiri merupakan suatu instalasi yang terdiri dari peralatan listrik yang berfungsi untuk mengubah daya listrik tegangan tinggi menjadi tegangan tinggi atau tegangan menengah lainnya. Untuk mendukung kelancaran penyediaan tenaga listrik dan menjamin kontinuitas kelistrikan, kemampuan peralatan yang ada di gardu induk sangat perlu mendapat perhatian khusus, seperti pengawasan dan perawatan secara berkala. Misalnya saja di Gardu Induk Nusa Dua yang lokasinya dekat dengan pantai dan hutan mangrove, banyak terdapat burung-burung liar yang berkeliaran dan mencari makan atau bahkan membuat sarang di area Gardu Induk Nusa Dua. Keberadaan burung-burung liar tersebut tentu dapat mengganggu operasional gardu induk, seperti membuang kotoran dan membuat sarang di peralatan listrik gardu induk. Burung-burung liar tersebut akan hinggap di peralatan yang ada di gardu induk dan tidak jarang juga akan membuang kotoran di peralatan yang dihinggapinya. Kotoran yang tidak dibersihkan lama-kelamaan akan mengeras dan dapat menimbulkan gangguan berupa titik api dan korsleting pada peralatan. Gangguan hotspot dan arus pendek pada gardu induk merupakan kendala yang tidak diinginkan oleh penyedia listrik dalam mengoperasikan sistem kelistrikannya. Maka dari itu kelompok kami berencana untuk membuat sebuah prototipe yang dapat memancarkan gelombang suara dengan frekuensi yang tidak disukai burung dengan memanfaatkan IoT dan sinar matahari sebagai sumber tenaganya. Dengan begitu, alat ini dapat dioperasikan melalui internet dan memiliki sumber energi sendiri, sehingga dapat dioperasikan dengan mudah dan dapat ditempatkan di tempat yang sulit dijangkau tanpa memerlukan perawatan yang berarti.

Pembuatan Pembangkit Listrik Termoelektrik pada Kompor Berbahan Bakar Pellet Biomassa Kayu Karet Devanka Arya Levin; Jonatan Sinurat; Anak Agung Ngurah Amrita; Ida Bagus Gede Manuaba
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 3 (2025): Desember : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i3.6818

Biomass is one of the materials that can be utilized as fuel. To ensure optimal quality, effective management of biomass is required to maximize its potential. One possible approach is the application of a biomass stove fueled by rubber wood pellets. By integrating a thermoelectric generator, data can be obtained to determine whether all aspects meet the established standards. This system is designed to generate electrical energy from combustion heat, supported by components such as a buck-boost converter and a 3V DC lamp. Testing was carried out using proximate and ultimate analyses on the fuel as well as the Water Boiling Test (WBT) on the stove, referring to SNI 8021:2020 and SNI 8021:2014 standards. The results showed that rubber wood pellets contained 7.64% moisture and had a calorific value of 4050 kcal/kg. The stove demonstrated an efficiency of 23.53%–37.28% and a fuel consumption rate of 0.61–0.77 kg/hour, both of which meet the requirements. In addition, the thermoelectric generator produced a voltage of 3.6 V and an electric current of 0.05 A, which are higher than those reported in previous studies (2.06 V and 0.01 A, respectively). Therefore, this thermoelectric biomass stove system is considered successful and feasible for further development as an alternative energy application.

RANCANG BANGUN SISTEM PAYUNG OTOMATIS BERBASIS INTERNET OF THINGS I Made Agus Calvin Ardhana Putra; I Putu Agus Eka Saputra; I Gusti Agung Putu Raka Agung; Anak Agung Ngurah Amrita
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p21

This study designs an Internet of Things (IoT)-based automatic umbrella system that can be operated manually or automatically via the Blynk application. The process begins with device initialization, including the configuration of the ESP32, servo motor, rain sensor, RTC, push button, and switch. The device then connects to a Wi-Fi network to enable data transmission and reception. In manual mode, the user can open or close the umbrella using a physical button or commands from Blynk. In automatic mode, the system follows a preset schedule: the umbrella opens from 08:00 to 16:00, remains open from 16:00 to 22:00 if rain is detected, and closes from 22:00 to 08:00. Data such as servo position, umbrella status, time, and operation mode are sent to Blynk in real time. Test results indicate that the system functions according to the design, provides ease of use, and helps protect.

Co-Authors A. Ibi Weking A.I. Weking ADITYA PRATAMA Agus, M.N. Ardyono Priyadi Aveliano Tandrianto Devanka Arya Levin Dharmawan, N. B. Duman Care Khrisne Gede Sukadarmika Gunawan, J.N. Havivi, Hoirur Rosiqin Hery Purnomo I G.N N. Santhiarsa I Gede Dyana Arjana I M.T. Sismantara I Made Agus Calvin Ardhana Putra I Made Mataram I Made Satriawan I N.K. Setiada I Nyoman Agus Junaedi I Nyoman Budiastra I Nyoman Oksa Winanta I Nyoman Setiawan I Putu A.B. Artha Wiraguna I Putu Agus Eka Saputra I Putu Weda Suryawan I Wayan Shandyasa I.B.G. Manuaba I.G.N. Adi Kurniawan I.M. Suartika I.N.Y. Prayoga I.P.H. Wahyudi IBG Manuaba Ida Bagus A. Swamardika Ida Bagus Gede Manuaba Jonatan Sinurat Komang Oka Saputra l Gusti Ngurah Janardana Linawati . M.S. Ugustra N. B. Dharmawan N. Nuswantara Novadianto Yudha Irawan Nyoman Putra Sastra Priambodo, Saga Putu Vendi Arya Wibawa R. S. Hartati, R. S. Rezky Setyawan Rukmi Sari Hartati S.K. Supriana Salsabila, Unik Hanifah Suartama, Putu Dandy Surya Puja Anggara Tjok Gede Indra Partha Wayan Gede Ariastina Widyadi Setiawan

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