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All Journal Jurnal Teknik Elektro TELKOMNIKA (Telecommunication Computing Electronics and Control) Al-Ulum Jurnal Populasi Edukasi Islami: Jurnal Pendidikan Islam Al-Muaddib : Jurnal Ilmu-Ilmu Sosial & Keislaman NUSANTARA : Jurnal Ilmu Pengetahuan Sosial JURNAL PENDIDIKAN TAMBUSAI Jurnal Review Pendidikan dan Pengajaran (JRPP) Pena Justisia: Media Komunikasi dan Kajian Hukum MUKADIMAH: Jurnal Pendidikan, Sejarah, dan Ilmu-ilmu Sosial IJITEE (International Journal of Information Technology and Electrical Engineering) Jurnal Ilmiah Al-Hadi Al-Ulum: Jurnal Pendidikan Islam Al-Fikru: Jurnal Ilmiah Fitrah: Journal of Islamic Education Journal of English Language and Education Unram Journal of Community Service (UJCS) At-Tadbir : Jurnal Manajemen Pendidikan Islam Educate: Jurnal Ilmu Pendidikan dan Pengajaran Al-Ulum: Jurnal Pendidikan Islam Jurnal Nasional Teknik Elektro dan Teknologi Informasi Journal Of Human And Education (JAHE) Al-Istinbath: Jurnal Hukum Islam Indonesian Research Journal on Education Innovative: Journal Of Social Science Research Jurnal Rekayasa elektrika Indonesian Journal of Education Research (IJoER) JIM: Jurnal Ilmiah Mahasiswa Pendidikan Sejarah Riwayat: Educational Journal of History and Humanities Jurnal Keislaman

Tumiran

Department Of Electrical Engineering And Information Technology, Faculty Of Engineering, Universitas Gadjah Mada

Author-ID : 205882

Religion Arts Humanities Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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Model Arrester SiC Menggunakan Model Arrester ZnO IEEE WG 3.4.11 Halomoan Sinaga, Herman; Haryono, T.; , Tumiran
Jurnal Teknik Elektro Vol 5, No 1 (2005): MARET 2005
Publisher : Institute of Research and Community Outreach

Arrester model is needed to analyse the insulation coordination in power system. The model should give a suitable respon for varying transient fault. In this paper, we conduct simulation that modified from IEEE WG 3.4.11 model. The model is modified by insert a switch that voltages dependent. Arrester modeling respons then compare to the laboratory testing result, with SiC 12 kV arrester sample. Testing conduct with time front varying from 1.2 to 29.7 s with magnitude 51 kV, 52.5 kV dan 54 kV. The difference between simulation and laboratory testing was 4.332 % for sparkovervoltage and 3.259 % for residual voltage discharge current Abstract in Bahasa Indonesia : Model arrester sangat dibutuhkan untuk menganalisis koordinasi isolasi dalam suatu sistem tenaga listrik. Model arrester yang dibuat harus memberikan tanggapan yang sesuai untuk semua kondisi gangguan transient. Dalam makalah ini dihasilkan simulasi dengan menggunakan model yang dimodifikasi dari model IEEE WG 3.4.11. Model ini dimodifikasi dengan menambahkan saklar yang dipengaruhi tegangan. Hasil yang didapatkan dari pemodelan kemudian akan dibandingkan dengan pengujian di laboratorium terhadap arrester SiC 12 kV. Pengujian dilakukan dengan surja tegangan dengan waktu muka 1.2 sampai 29.7 s dan puncak tegangan diberikan sebanyak 3 tingkatan, 51 kV, 52.5 kV dan 54 kV. Perbandingan hasil pengujian dan simulasi memberikan perbedaan sebesar 4.332 % untuk tegangan potong dan 3.259 % untuk tegangan residu arus pelepasan. Kata kunci: Model Arrester, Arrester SiC, Respons Transient.

Electrical Tracking Formation on Silane Epoxy Resin under Various Contaminants Abdul Syakur; Hamzah Berahim; Tumiran Tumiran; Rochmadi Rochmadi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 11, No 1: March 2013
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v11i1.878

Contamination at the surface of the insulator becomes a serious problem. Especially for the tropical area, humidity and rainfall play an important role in wetness by the water at the insulator surface, which result in the presence of contaminant and leakage current flowing at the surface. This leakage current will generate heat which occurs at the surface of an insulator. This ultimately leads to flashover. This paper presents the influence of contaminants to leakage current and formation of electrical tracking at the surface of epoxy resin compound wit silicon rubber. The test was based on IPT method with NH4Cl as contaminants. The industrial and coastal contaminants are used to explain the effect of contaminant at surface tracking process. The flow rate of contaminant was 0.3 ml/min. The 3.5 kV AC high voltage 50 Hz was applied to the top electrodes. It is found that industrial contamination resulting in the smallest surface leakage current is 327.6 mA. Also it is found that coastal contaminant showed the severest damage at surface of test sample. Therefore, special treatment of the sample is needed under these conditions so that the material performance can be improved, especially against the electrical tracking.

The Damage of ZnO Arrester Block Due To Multiple Impulse Currents Tarcicius Haryono; K. Tunggul Sirait; Tumiran Tumiran; Hamzah Berahim
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 1: April 2011
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v9i1.685

A lightning arrester installed in an electrical power system is designed to protect some electrical equipment against damage due to lightning impulse strike. However, if there is a multiple impulse current striking a lightning arrester, it may damage the lightning arrester itself and then, as a result, it cannot provide lightning protection to the electrical equipment anymore. In this research, three peak values of lightning impulse current,which were 600, 1300, and 2500A, each of which had 5 repetitive impulse current, was applied to a 5000A (1p.u.) ZnO block of a 24kV nominal voltage lightning arrester having seven ZnO block units. The results of research showed that by applying impulse current of the order of 600(0.12), 1300(0.26), dan 2500(0.5) A(p.u.), making the ZnO block damage as much as 26.58, 50, and 100% concecutively. In addition, the damage of the ZnO block appeared as permanen low value of residual voltage as low as more than 5% of the new ZnO block residual voltage. If the ZnO block is still being used in a lightning arrester in electrical power system, it may result in the opening of a circuit breaker and possibly making electrical power outages from a number of electrical power customers.

Accelerated Aging Effect on Epoxy-polysiloxane-Rice Husk Ash Polymeric Insulator Material Tumiran Tumiran; Arif Jaya; Hamzah Berahim; Rochmadi Rochmadi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 10, No 4: December 2012
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v10i4.853

The performances of outdoor polymeric insulators are influenced by environmental conditions. The use of polymeric materials in a particular composition can be produced insulators that are resistant to environmental influences. This paper presents the effect of artificial tropical climate on the hydrophobicity, equivalent salt deposit density (ESDD), surface leakage current, flashover voltage, and surface degradation on epoxy-polysiloxane polymeric insulator materials with rice husk ash (RHA). Test samples are made at room temperature vulcanized (RTV) of various composition of epoxy-polysiloxane with rice husk ash as filler. The aging was carried out in test chamber at temperature from 50oC to 62oC, relative humidity of 60% to 80%, and ultraviolet (UV) radiation 21.28 w/cm2 in daylight conditions for 96 hours. The experiment results showed that the flashover voltage fluctuates from 34.13 kV up to 40.92 kV and tends to decrease on each variation of material composition. The surface leakage current fluctuates and tends to increase. Test samples with higher filler content result greater hydrophobicity, smaller equivalent salt deposit density, and smaller critical leakage current, which caused the increase of the flashover voltage. Insulator material (RTVEP3) showed the best performance in tropical climate environment. Artificial tropical aging for short duration gives less effect to the surface degradation of epoxy-polysiloxane insulator material.

Power Oscillation Damping Control using Robust Coordinated Smart Devices Tumiran Tumiran; Cuk Supriyadi Ali Nandar; Sarjiya Sarjiya
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 1: April 2011
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v9i1.646

The lack of damping of the electromechanical oscillation modes usually causes severe problems of low frequency oscillations in interconnected power systems. In the extreme operating conditions, PSS may fail to damp power oscillation. This paper presents a robust coordinated design of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) to damp power oscillation in an interconnected power system. The inverse additive perturbation is applied to represent unstructured uncertainties in the power system such as variations of system parameters, system generating and loading conditions. In addition, genetic algorithm is employed to search a robust tuning to the controller parameters of both PSS and TCSC simultaneously. Simulation studies have been done in a single machine infinite bus system to confirm that the performance and robustness of the proposed controller are superior to that of the conventional controller.

Kebijakan Pertamina dalam Perdagangan Minyak Indonesia (1969–2015) Sukusen Soemarinda; Yeremias T. Keban; Muhadjir Darwin; Tumiran Tumiran
Populasi Vol 26, No 2 (2018)
Publisher : Pusat Studi Kependudukan dan Kebijakan, Universitas Gadjah Mada

Pertamina has a long history of oil trading and was influenced by the actors seizing for the power. The first oil shipments was held in 1958, while this research only discussesPertamina oil trading from 1969 to 2015 through a special subsidiary which was established to carry out the trading for almost fifty years since it was still named as Perta Group (1969) until Petral (2015). The purpose of this research is to know how Pertamina oil trading policy was specified and implemented over a period of time and parties affecting the process so rent- seeking and corruption happened throughout the history of Pertamina oil trading. The method of research a descriptive qualitative method of case study. The data was collected from various documents and interview of perpetrators related. Based on the research carried out, Pertamina oil trading from Perta Group (1969) until Petral (2015) could be classified into three periods, i.e. Perta Group period (1969-1978), POML period (1978-1998), and Petral (1998-2015). The first and second period occurred under the authority of the New Order government, while the third period under the reformation periodThe first period was characterized by the domination of military interests and the second period influenced by the interests of inner circle and family business related to the ruler of the New Order and the third period was dominated by the influence of powerfull person/company.

Design of a Low Cost High Efficiency Multiple Output Self Oscillating Flyback Converter Yogi Sawitra; Prapto Nugroho; Eka Firmansyah; Wahyu Dewanto; Rudy Hartanto; Tiyono Tiyono; Tumiran Tumiran
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 2 (2017): June 2017
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

The use of some integrated circuits in an SMPS circuit are the main factor that increasing the cost. Self-oscillating feedback converter topology is a well-known circuit topology for low-cost application without using any single integrated circuit chip. In this paper, a Low Cost with high efficiency converter without any single integrated circuit component was analysed and designed. It has also multiple outputs of 3.3 V/1 A, 5 V/0.5 A, and 12 V/0.1 A so that it can be used as power supply for DVD player. Experiment results showed that it can deliver continuously output voltage as designed and a total output power of 7.3 W, with an efficiency for about 70%.

Fault Location Algorithm for HVDC Transmission Based on Synchronized Fault Time Kristianto Adi Widiatmoko; F. Danang Wijaya; Tumiran Tumiran
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 3, No 2 (2019): June 2019
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

To determine the fault location of the dc line fault in an HVDC transmission system, a new algorithm based on the traveling wave method and learning based method is proposed in this paper. The relationship between the traveling wave time of arrival differences with fault location is presented. The differences in traveling wave time of arrival measured at both ends of transmission line combined with associated fault locations form a fault pattern which is used to perform a simple calculation in order to determine the disturbance location. The fault current for different fault locations is simulated using the electromagnetic transient simulation software EMTDC/PSCAD. Performance of the proposed fault location algorithm is investigated using various fault location and resistance. The impact of data sampling rate also being investigated here. The simulation result shows that the proposed algorithm can reduce the sampling frequency and the number of train feature with the same accuracy.

Peningkatan Stabilitas Transien pada Turbin Angin Berbasis DFIG Menggunakan SFCL tipe Bridge Doane Puri Mustika; Sasongko Pramono Hadi; Mokhammad Isnaeni B; Mohd. Brado Frasetyo; Tumiran
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 11 No 4: November 2022
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jnteti.v11i4.5031

Today’s electrical energy is mainly produced by burning fossil fuels, which actually has negative effects on earth, namely global warming. In the electricity sector, measures that can be taken to reduce emissions include replacing conventional generators with renewable ones. Wind energy is one type of new renewable energies (NREs) with the potential to reduce emissions. Wind turbines widely used today are variable speed wind turbines, such as the doubly-fed induction generator (DFIG). DFIG has numerous advantages, like having more flexibility and being able to control both active and reactive powers. However, it often encounters instability problems in its system when experiencing transients. Therefore, a solution that can improve transient stability in DFIG is needed. The bridge-type superconducting fault current limiter (SFCL) was used in this research as a solution to improve the transient stability in DFIG, which consisted of two diodes and two inductors. This bridge-type SFCL operates by limiting the current in the event of faults, preventing the system from voltage drops or trips. The simulation results were analyzed under two circumstances. In the first circumstance, the 9 MW DFIG wind turbine system which was given faults using SFCL produced a voltage value of 219 V, with a more stable frequency value of 50 Hz, and an active power value of 9 MW. Meanwhile, when a system that did not use SFCL was given faults, the voltage dropped from the normal state of 219 V to 100 V. The frequency value was less stable, fluctuating between 49.75 Hz and 50.25 Hz, while the active power dropped from 9 MW to 6 MW. This result proves that the bridge-type SFCL method effectively increases the transient stability in DFIG.

Pengujian Karakteristik Limbah Pasir PLTP Dieng Sebagai Bahan Pengisi Isolator Resin Epoksi Silane Abdul Syakur; Tumiran Tumiran; Hamzah Berahim; Rochmadi Rochmadi
Jurnal Rekayasa Elektrika Vol 9, No 4 (2011)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (680.369 KB)

Epoxy resin has been developed as an insulator material on the distribution and transmission line. In its development, the basic composition of DGEBA epoxy resin with MPDA as hardener is hydrophilic. Silane is added to improve the surface properties of materials to be more hydrophobic. To reduce the volume of epoxy resin as base material, silica sand from PLTP Dieng is added as filler. This paper presents the results of research on the effect of adding the composition of silica materials from PLTP Dieng upon silane epoxy resin sample to the value of the dielectric loss factor, contact angle and leakage current. Samples were prepared with a sample size 120mm x 50mm x 5mm. Material is composed of DGEBA, MPDA, silanes and silica with a various composition. Sample codes were 10%, 20%, 30%, 40% and 50%. Contact angle and leakage current were carried out according with IEC 587:1984 standards. Measurement of the dielectric loss factor (Tan ) was carried out at the Laboratory of High Voltage Engineering, PT. PLN (Persero) Electricity RD, Duren Tiga Jakarta, using a measuring instrument series M4100 Insulation Analyzer Instrument. The electrodes used in these measurements have diameter of 2.5 cm and 5 cm. The results showed that the composition of silica materials PLTP Dieng upon silane epoxy resin samples affect the value of dielectric loss factor. Based on the results of the measurement, it is concluded that the higher composition of silica materials, the higher value of dielectric loss factor are. Based on these results, it is suggested that the use of silica as a filler must consider the effect on the value of dielectric loss factor. When the dielectric loss factor is high, then the losses in the dielectric material is also high.

Co-Authors A., Hayatul Ridho P. Abdul Hakim Abdul Syakur Agustia, Nanda Rahayu Agustin, Dewi Ahmad Afandi Ananda, Tri Ariani Anggraini, Fadillah Ardani, Syafira Arif Jaya Azhar, Abdul Izul Azhari, Faiza Baehaqi Bahtiar Siregar Cuk Supriyadi Ali Nandar Danny Abrianto Diah Rahmawati Doane Puri Mustika Effendi, Elvhira Eka Firmansyah Ependi, Rustam Erwin Erwin F. J. Nangoy, F. J. Fadillah, Hari Hikmatul Faiza Azhari Firdaus, M. Iqbal Fransisco Danang Wijaya Fredy J. Nangoy Hamzah Berahim Hamzah Berahim Hamzah Berahim Hannum, Latifah Harahap, Sarwedi Herman Halomoan Sinaga Husin Husin, Husin Hutasuhut, Anwar Ihsyan, Hakimah Ika Novia Irwanto, Ronny Ismaraidha J Mandey John E. G. Rompis Jola J.M.R. Londok K. Tunggul Sirait Khalistiasari, Rubi Yohana Kristianto Adi Widiatmoko Laihad, J. T. Lubis, Sakban Manshuruddin, Manshuruddin Mardinsyah, Aziz Marista, Refi Mohd. Brado Frasetyo Mokhammad Isnaeni Bambang Setyonegoro Muhadjir Darwin Muhammad Arif Sahlepi Muhammad Yunan, Muhammad Nanda Rahayu Agustia Nasution, Khairil Anwar Nasution, Napsiah Nasution, Zuprianto Nofianti, Rita Nur Aini Pangabean, Hadi Syahputra Panggabean, Hadi Saputra Prapto Nugroho Rahayu, Sinta Rahima, Dheria Rahmah, Riza Ramadhani, Siti Rangkuti, Charles Riza Rahma, Riza Rizky, Nanda Rochmadi Rochmadi Rochmadi Rochmadi Rudy Hartanto Saragih, Siti Sahrapmahita Sarajar, C. L. K. Sarjiya Sasongko Pramono Hadi Sembiring, Rizky Aji Akbar Setiawan, M. Rizki Sirait, Syarifuddin Siregar, Bahtiar Siregar, Mansur Ali Hanafi Sitorus, Panca Abdini Sukusen Soemarinda Syahrial, Abdi T. Haryono Tarcicius Haryono Tiyono Ujung, Tumbi Umat, Hardakwah Utami, Rahayu Dwi Wahyu Dewanto Yeremias T. Keban Yogi Sawitra Yunan Harahap, Muhammad Yusuf Nasution, Khairuddin

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