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All Journal Buletin Udayana Mengabdi Jurnal SPEKTRUM Jurnal Ilmiah Kursor INTECOMS: Journal of Information Technology and Computer Science 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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PENENTUAN KONDISI TRANSFORMATOR BERDASARKAN KANDUNGAN GAS TERLARUT MENGGUNAKAN METODE SEGITIGA DUVAL I M.T. Sismantara; W.G. Ariastina; A.A.N. Amrita
Jurnal SPEKTRUM Vol 8 No 1 (2021): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Transformer failure may interrupt the electrical power delivery and causing a very highcost to the utility. In order to prevent failure in the transformer, continuous condition monitoringof a power transformer is necessary. Dissolved Gas Analysis (DGA) has been well knownmethod for transformer condition monitoring. A number of techniques have been developed inorder to assist engineers in interpreting the DGA test results. In this research, interpretation ofDGA test results using Fuzzy Logic approach based on Duval's Triangle is introduced. TheFuzzy Logic was developed based on the mapping of the different areas within the DuvalTriangle. The program validation was carried out by comparing the output program with thesimulated fault condition. The analysis results indicated that the introduced approach hassuccessfully determined the condition of the tested transformers. This approach, thus, wouldprovide advantages over the conventional method in determining the transformer condition.

STUDI SISTEM PROTEKSI LINE CURRENT DIFFERENTIAL RELAY PADA SALURAN TRANSMISI 150 KV N. B. Dharmawan; W. G. Ariastina; A. A. N. Amrita
Jurnal SPEKTRUM Vol 7 No 1 (2020): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Increasing electricity demand in South Bali requires a reliable electrical system. Reliableelectrical systems can be achieved in various ways, one of which is the replacement of highvoltage overhead line to high voltage underground cable. The replacement high voltageoverhead line to high voltage underground cable requires adjustment of the protection system.The previous main protection system used in high voltage overhead line is distance relay, whilethe protection system for the new transmission network is line current differential relay. Thepurpose of this study is to analyze GIS Pesanggaran to GI Nusa Dua transmission line’sprotection system. The covered in this analysis is to power flow analysis simulation, 3 phaseshort circuit simulation, relays setting calculation and testing the relays setting.The power flowsimulation showed that the current at peak load from GIS Pesanggaran to GI Nusa Dua is 337A. The 3 phase short circuit simulation showed that the largest short circuit, if a fault occurs onthe GI Nusa Dua of 9.54 kA. The relays setting calcullation showed that of 0,2 A with 20 %slope for Is1 and 2 A with 150% slope for Is2. The results showed that the relays setting hasworked properly.

STUDI INTENSITAS MEDAN LISTRIK DI SUTT 150 kV KONFIGURASI VERTIKAL UNTUK LINGKUNGAN PEMUKIMAN I.N.Y. Prayoga; A.A.N. Amrita; C.G.I. Partha
Jurnal SPEKTRUM Vol 2 No 4 (2015): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (386.209 KB)

Rekomendasi pembangunan rumah yang aman di bawah SUTT 150 kV konfigurasi vertikal dibutuhkan untuk menghindari paparan medan listrik yang dapat menyebabkan gangguan kesehatan manusia sesuai dengan standar yang telah ditetapkan oleh SNI dan WHO yaitu sebesar 5 Kv/m. Perhitungan kuat medan listrik pada 9 titik di bawah SUTT 150 kV konfigurasi vertikal menunjukkan kuat medan listrik tertinggi berada pada andongan terendah diantara 2 tiang SUTT. Rekomendasi pembangunan rumah pada andongan terendah sampai ketinggian lantai 4 meter dari permukaan tanah dengan intensitas medan listrik sebesar 4,75 kV/m. Intensitas medan listrik terendah berada tepat di bawah tiang SUTT dan direkomendasikan pembangunan rumah sampai ketinggian lantai 7 meter dari permukaan tanah dengan intensitas medan listrik sebesar 4,95 kV/m.

PERAMALAN BEBAN LISTRIK JANGKA PENDEK MENGGUNAKAN METODE ADAPTIVE NEURO FUZZY INFERENCE SYSTEM (ANFIS) DI GARDU INDUK NUSA DUA BALI I Made Satriawan; I Made Mataram; A. A. Ngurah Amrita
Jurnal SPEKTRUM Vol 7 No 1 (2020): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Electric load in Nusa Dua Bali has increased from 2013-2017 by an average of 11.83%. The increase in electric load requires the electrical energy service provider to be able to adjust the electricity demand and be able to increase its reliability, The effort that can be done is to predict the electric load. Electric load forecasting can be done by various methods, ANFISo (Adaptiveo Neuroo Fuzzyo Inferenceo Systemo) is one method that is often used in forecasting electrical loads. ANFIS is able to explain the reasoning process and do data learning. The data used are the electric load, temperature, humidity and time, the data was chosen because changes in temperature and humidity affect people's habitual patterns in using air conditioners (electric load patterns). The electric load pattern is trained 100 times using ANFIS with the type of membership function is trimf, and [3 3 3 3] is the number of membership function. The indicator to determining the accuracy of the electrical load forecasting pattern results with the real electric load pattern used the MAPE (Mean Absolute Percentage Error) value, which the MAPE standard value that good is less than 10%. The test results from this study produced a MAPE value of 6.98%.

Studi Tegangan Tembus Minyak Transformator I Nyoman Oksa Winanta; Anak Agung Ngurah Amrita; Wayan Gede Ariastina
Jurnal SPEKTRUM Vol 6 No 3 (2019): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

This study aims to identify the effect of changes in temperature, water content, andelectrode gap on the breakdown voltage of transformer oil. The transformer oil used in this studywas Shell Diala-B and Nynas oil. Testing the effect of temperature was carried out attemperature variation of 280 C to 810 C, the effect of water content was carried out withvariations ranging from 11 ppm to 31 ppm, and the effect of electrode gap was carried out invariation ranges between 1.2 mm to 2.5 mm. Breakdown voltage testing method useshemispherical electrodes according to IEC 60156 standard of 1995. The results of the studyshow that the higher the temperature, the higher the breakdown voltage of transformer oil. Thehighest breakdown voltage in Nynas oil occurs when the temperature is 810 C which is equal to59.27 kV. The results also show that the higher the water content, the breakdown voltage islower. The highest breakdown voltage in Shell Diala-B oil occurs with a water content of 11 ppmwhich is equal to 61.35 kV. Also the greater the electrode gap, the greater the breakdownvoltage. The highest breakdown voltage in Nynas oil occurs with the gap of electrode 2.5 mmwhich is equal to 60.02 kV.

KAJIAN KUAT MEDAN LISTRIK SALURAN TRANSMISI 150 KV PADA KONFIGURASI VERTIKAL M.S. Ugustra; A.A.N. Amrita; I.G.N. Janardana
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 (344.814 KB)

Proses penyaluran tenaga listrik tegangan tinggi memiliki dampak terhadap lingkungan sekitar saluran transmisi. Salah satu dampak penyaluran tegangan tinggi adalah timbulnya medan listrik di sekitar konduktor saluran transmisi. Kajian kuat medan listrik saluran transmisi 150 kV pada konfigurasi vertikal, dilakukan dengan melakukan perhitungan dengan menggunakan metode bayangan dan pengukuran kuat medan listrik di bawah saluran transmisi. Perhitungan dilakukan untuk mengetahui bagaimana karakteristik kuat medan listrik pada suatu titik di bawah saluran transmisi. Perhitungan kuat medan listrik tertinggi pada lokasi 1 sebesar 4283 V/m dan pada lokasi 2 sebesar 4521 V/m. Hasil pengukuran kuat medan listrik tertinggi pada lokasi 1 sebesar 4251 V/m dan pada lokasi 2 sebesar 4700 V/m. Perbedaan karakteristik hasil pengukuran kuat medan listrik pada titik dengan jarak yang sama, disebabkan pengukuran kuat medan listrik tidak dilakukan pada waktu yang sama, sehingga perubahan tegangan fase ke netral masing-masing fase konduktor mengakibatkan perbedaan hasil pengukuran.

Studi Kestabilan Sistem dan Pelepasan Beban (Load Shedding) Berdasarkan Standar IEEE di PT. Pertamina (Persero) Refinery Unit IV N. Nuswantara; W.G. Ariastina; A. A. N. Amrita
Jurnal SPEKTRUM Vol 4 No 1 (2017): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Dalam mengatasi kondisi overload generator saat terjadi gangguan yang menyebabkan ketidak stabilan, PT. Pertamina RU IV mengandalkan kerja load shedding berdasarkan SOP yang telah ditetapkan. Namun dalam pelaksanaannya prosedur SOP yang diberlakukan memiliki beberapa kekurangan, diantaranya adalah belum sesuai dengan standar IEEE yang berlaku global, waktu untuk menstabilkan kembali sistem cukup lama, serta seringkali terjadi pelepasan beban yang sebenarnya tidak perlu. Oleh karena itu, dilakukan studi terhadap kestabilan sistem dan load shedding yang diberlakukan dengan menggunakan standar IEEE sebagai acuan. Hasil studi menunjukkan, penggunaan load shedding IEEE untuk mengatasi masalah kestabilan sistem di PT. Pertamina RU IV lebih efektif, hal ini dapat dilihat dari hasil pengujian kestabilan sistem dimana prosedur load shedding IEEE berhasil menstabilkan kembali frekuensi sistem menjadi 99,85% dalam waktu 23 detik, 98,5% dalam waktu 8 detik, 99,16% dalam waktu 40 detik menjadi 98,48% dalam waktu 70 detik pada 4 studi kasus yang dilakukan.

RANCANG BANGUN SISTEM PENAMPUNGAN AIR MENGGUNAKAN TANDON ATAS SECARA OTOMATIS BERBASIS MIKROKONTROLER Rezky Setyawan; Anak Agung Ngurah Amrita; Komang Oka Saputra
Jurnal SPEKTRUM Vol 8 No 1 (2021): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Water reservoirs are temporary water reservoirs, usually placed at the highest. The communityplaces or installs water reservoirs above the house by using gravity so that the water can run downswiftly. In general, to get clean water, people use PDAM services or use well water. Generally, in urbanareas, the water sources used to supply water reservoirs come from PDAMs or wells (boreholes). In theclean water storage system using an upper reservoir has several problems, such as monitoring theavailable water capacity in the borehole which cannot be known so that the pump will operate for a longtime to fill water and cause damage to the pump, due to the difficulty of monitoring and controlling. Thecondition of the upper reservoir water storage is therefore designed in this study with a prototype"WATER SANDING SYSTEM USING UP TANDON AUTOMATICALLY BASED ONMICROCONTROLLER" which can be monitored via SMS and manually.

COORDINATION CONTROLLER POWER SYSTEM IN JAVA-BALI 500 KV INTERCONECTED BASED ON BACTERIA FORAGING - PARTICLE SWARM OPTIMIZATION FOR STABILITY IMPROVEMENT IBG Manuaba; AAN Amrita; Ardyono Priyadi; Hery Purnomo
Jurnal Ilmiah Kursor Vol 8 No 2 (2015)
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28961/kursor.v8i2.65

Power system stabilizer (PSS) and flexible AC transmission system (FACTS) damping controller to improve the stability of the power system has been widely used. A coordinated control method based on the combined computational evolutionary theory is proposed to overcome some of damping controllers simultaneously so as to keep the allowable level of power system damping. It works by making full use of favorable interaction between the controlling and minimizing adverse interactions so that the power system oscillations can be suppressed effectively. Proportional integral derivative (PID) controller tuning based power system stabilizer types PSS3B (PIDPSS3B), static var compensator (SVC) and automatic voltage regulator (AVR) presented in this paper. PID controller gain parameters such as proportional, integral factor, differential coefficient and get AVR selected and optimized by BF-PSOTVAC. The integral time absolut error (ITAE) standards of optimization design as objective function. The results of simulations show that performance index of system the proposed method is 42.7890. The BF-PSOTVAC method has the capability to damping optimally and suppresses error to minimum.

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.

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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