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All Journal Jurnal Teknik Elektro Majalah Ilmiah Teknologi Elektro TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Populasi Edukasi Islami: Jurnal Pendidikan Islam NUSANTARA : Jurnal Ilmu Pengetahuan Sosial IJITEE (International Journal of Information Technology and Electrical Engineering) Jurnal Ilmiah Al-Hadi 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 Jurnal Nasional Teknik Elektro dan Teknologi Informasi Jurnal Rekayasa elektrika JIM: Jurnal Ilmiah Mahasiswa Pendidikan Sejarah Riwayat: Educational Journal of History and Humanities Majalah Ilmiah Teknologi Elektro
Tumiran
Department Of Electrical Engineering And Information Technology, Faculty Of Engineering, Universitas Gadjah Mada
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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

 1 
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

Abstract

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

Abstract

 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

Abstract

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

Abstract

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.
Co-Authors Abdul Syakur Agustia, Nanda Rahayu Agustin, Dewi Arif Jaya Azhar, Abdul Izul Azhari, Faiza Bahtiar Siregar Cuk Supriyadi Ali Nandar Danny Abrianto Doane Puri Mustika Eka Firmansyah Ependi, Rustam F. J. Nangoy, F. J. Faiza Azhari Fransisco Danang Wijaya Fredy J. Nangoy Hamzah Berahim Hamzah Berahim Hamzah Berahim Hannum, Latifah Herman Halomoan Sinaga Ihsyan, Hakimah Ika Novia 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 Yunan, Muhammad Nanda Rahayu Agustia Nasution, Napsiah Nofianti, Rita Panggabean, Hadi Saputra Prapto Nugroho Rahayu, Sinta 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 Setiawan, M. Rizki Sirait, Syarifuddin Siregar, Bahtiar Sitorus, Panca Abdini Sukusen Soemarinda T. Haryono Tarcicius Haryono Tiyono Umat, Hardakwah Wahyu Dewanto Yeremias T. Keban Yogi Sawitra