Articles
<![CDATA[Pengaruh Keberadaan Partikel Asing Terhadap Karakteristik Medan Listrik Pada GIS Equilateral Tiga Fasa ]]>
<![CDATA[Pratama, Rizki Wahyu]]>;
<![CDATA[Andre, Hanalde]]>;
<![CDATA[Khayam, Umar]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v10n1.850.2021
<![CDATA[This paper analyzes the effect of the presence of foreign particles on an equilateral arrangement of 3 phase gas insulated switchgear (GIS) insulation equipment. In this calculation, the electric field characteristics will be analyzed in 3-phase equilateral GIS by varying the location of the particles in the GIS tank. Particles are modeled to have a length of 5 mm and a thickness of 0.5 mm located in a 3 phase GIS equilateral arrangement with a tank diameter of 150 mm and a conductor diameter of 25 mm. The electric field calculations are reviewed at several points in the 3-phase equilateral GIS tank. The simulation and calculation of the electric field were calculated with FEM method software. The results of the calculations show that there are differences in the characteristics of the electric field between normal GIS and GIS where foreign particles are present. The difference in these characteristics can be seen in the magnitude of the electric field, and the ratio of eccentricity from some point of view. Keywords : gas insulated switchgear, equilateral, foreign particles, electric field, eccentricity ratioAbstrakPaper ini menganalisa tentang pengaruh keberadaan partikel asing pada peralatan hubung isolasi gas/ gas insulated switchgear (GIS) 3 fasa susunan equilateral. Pada perhitungan ini, akan dianalisa karakteristik medan listrik pada GIS equilateral 3 fasa dengan memvariasikan letak partikel dalam tangki GIS. Partikel dimodelkan memiliki panjang 5 mm dan ketipisan 0.5 mm terletak di dalam GIS 3 fasa susunan equilateral dengan diameter tangki 150 mm dan diameter konduktor 25 mm. Perhitungan medan listrik ditinjau pada beberapa titik dalam tangki GIS equilateral 3 fasa. Simulasi dan perhitungan medan listrik dilakukan dengan perangkat lunak menggunakan metode FEM. Hasil dari perhitungan menunjukkan adanya perbedaaan karakteristik medan listrik antara GIS normal dengan GIS yang terdapat partikel asing. Perbedaan karakteristik ini dapat dilihat pada besar medan listrik, dan rasio eksentrisitas pada beberapa titik tinjau keberadaan partikel. Kata Kunci : gas insulated switchgear, equilateral, partikel asing, medan listrik, rasio eksentrisitas]]>
<![CDATA[Antena Kupu - Kupu Sebagai Sensor Ultra High Frequency (UHF) Untuk Mendeteksi Partial Discharge Pada Gas Insulation Substation ]]>
<![CDATA[Andre, Hanalde]]>;
<![CDATA[Khayam, Umar]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 2, No 2: September 2013 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v2n2.69.2013
<![CDATA[The use of antennas as receiving electromagnetic waves can be used as a tool for the detection of partial discharge (PD) that occurs in high voltage equipment. Especially in the insulation gas substation (GIS), the characteristics of the electromagnetic waves generated lies in the range of ultra high frequency (UHF) in the range of 300 MHz - 3 GHz. Characteristics of the antenna ultra wide band (UWB) is required to detect PD in a wide range. Antenna design is done using a simulation with finite element method or finite element method (FEM). Characteristics of return loss (RL) to be considered in the design of the antenna to get better sensitivity yan. Antenna testing is done with vector network analyzer (VNA). Measurement and simulation results of the modified antennas showed a decrease in the value of RL.Keywords : Partial Discharge (PD), Antena, Ulltra High Frequency (UHF),Gas Insulation Substation     (GIS) AbstrakPenggunaan antena sebagai penerima gelombang elektromagnetik dapat digunakan sebagai alat untuk mendeteksi kegiatan partial discharge (PD) yang terjadi pada paralatan tegangan tinggi. Khususnya pada gas insulation substation (GIS), karakteristik gelombang elektromagnetik yang dihasilkan terletak pada rentang ultra high frequency (UHF) dalam rentang 300 MHz – 3 GHz. Karakteristik antena ultra wide band (UWB) diperlukan untuk mendeteksi PD pada rentang yang lebar. Perancangan antena dilakukan menggunakan simulasi dengan metoda elemen hingga atau finite element method (FEM). Karakteristik return loss (RL) antena dipertimbangkan dalam perancangan untuk mendapatkan sensitivitas yan lebih baik. Pengujian antena dilakukan dengan vector network analyzer (VNA). Hasil pengukuran dan simulasi antena yang dimodifikasi menunjukkan penurunan nilai RL. Keywords : Partial Discharge (PD), Antena, Ulltra High Frequency (UHF),Gas Insulation Substation     (GIS)  ]]>
<![CDATA[Experimental and Simulation Studies of Thermal Distribution on Modified Connector of Li-Ion Battery for Electric Vehicles Application ]]>
<![CDATA[Agus Risdiyanto]]>;
<![CDATA[Umar Khayam]]>;
<![CDATA[Noviadi A. Rachman]]>;
<![CDATA[Maulana Arifin]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 6, No 5: October 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v6i5.pp2064-2072
<![CDATA[One of the several failure cases in electric vehicle could be occured at the Lithium-ion (Li-ion) battery connectors when loaded by high current. This failure caused by bad contact of connectors so that the contact resistance increase and lead to high power losses, overheating, and it can even cause a fire hazard. This paper presents a thermal distributions of Li-ion battery connectors on different coating material in relation to the value of contact resistance. There were two test samples of modeled: copper connection without coating and copper connection with silver coating. Each sample was loaded by the DC current of 350A, and temperature at the connection was measured until steady state condition reached and simulated by Solidwork software. The results show that the temperature at the inside contact area was higher than the outside contact area of connection that appears caused by higher of the contact resistance. Both measurement and simulation results have same tendency that copper connection with silver coating having lower contact resistance, lower maximum temperature, and lower losses about 32 % than copper connection without coating. Silver coating can be considered as other alternative to prevent overheating, high losses, and failure in Li-ion battery connector.]]>
<![CDATA[Cognitive artificial-intelligence for doernenburg dissolved gas analysis interpretation ]]>
<![CDATA[Karel Octavianus Bachri]]>;
<![CDATA[Umar Khayam]]>;
<![CDATA[Bambang Anggoro Soedjarno]]>;
<![CDATA[Arwin Datumaya Wahyudi Sumari]]>;
<![CDATA[Adang Suwandi Ahmad]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 1: February 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i1.11612
<![CDATA[This paper proposes Cognitive Artificial Intelligence (CAI) method for Dissolved Gas Analysis (DGA) interpretation adopting Doernenburg Ratio method. CAI works based on Knowledge Growing System (KGS) principle and is capable of growing its own knowledge. Data are collected from sensors, but they are not the information itself, and thus, data needs to be processed to extract information. Multiple information are then fused in order to obtain new information with Degree of Certainty (DoC). The new information is used to identify faults occurred at a single observation. The proposed method is tested using the previously published dataset and compared with Fuzzy Inference System (FIS) and Artificial Neural Network (ANN). Experiment shows CAI implementation on Doernenburg Ratio performs 115 out of 117 accurate identification, followed by Fuzzy Inference System 94.02% and ANN 78.6%. CAI works well even with small amount of data and does not require trainings.]]>
<![CDATA[Partial Discharge Signal Denoising by Discrete Wavelet Transformation ]]>
<![CDATA[Trinurkalid Sumarwoto]]>;
<![CDATA[Arief Basuki]]>;
<![CDATA[Umar Khayam]]>;
<![CDATA[Naohiro Hozumi]]>
<![CDATA[ EPI International Journal of Engineering Vol 1 No 1 (2018): Volume 1 Number 1, February 2018 ]]>
Publisher : <![CDATA[Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University ]]>
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<![CDATA[There are several techniques to eliminate noise on signals such as signal analysis in time zone, frequency area and Short Time Fourier Transform. In the partial discharge signal, the signal analysis can be realized in the time domain or in the frequency domain. Where frequency and time analysis is the basic methodology in signal processing. The disadvantage of signal processing in the frequency domain is the time domain information being lost. Though, we need another solution for signal analysis. Wavelet transform is a solution to overcome the shortage because it can provide information in time and frequency domain. Wavelet transforms (WT) have been applied in various fields for signal processing in recent years. In this paper, a study of wavelet transformation was done to reduce noise from partial discharge signals that has been obtained from previous experiment. This application uses matlab software. In simulation, this wavelet application software performed as much as 144 times for one partial discharge signal by combining threshold, wavelet type, and level]]>
<![CDATA[Simulation of Partial Discharge Induced Electromagnetic Wave in Power Transformer ]]>
<![CDATA[Nhet Ra]]>;
<![CDATA[Tomohiro Kawashima]]>;
<![CDATA[Naohiro Hozumi]]>;
<![CDATA[Yoshinobu Murakami]]>;
<![CDATA[Umar Khayam]]>;
<![CDATA[Suwarno Suwarno]]>
<![CDATA[ EPI International Journal of Engineering Vol 1 No 1 (2018): Volume 1 Number 1, February 2018 ]]>
Publisher : <![CDATA[Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University ]]>
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<![CDATA[This paper describes the numerical simulation of partial discharge (PD) in oil-filled power transformer using FDTD method (Finite Difference Time Domain). We investigated the effects of oil insulation medium and internal structures on the propagation of electromagnetic signal emitted from the partial discharge source. In this study, partial discharge was modeled as the Gaussian Pulse with the width 20ns. To observe the electromagnetic intensity and also the voltage distribution, three sensors were employed. The magnitude, frequency, and attenuation of the EM wave without internal structure and with internal structure were compared. The Results show that the EM wave intensity attenuated while propagating through the winding and oil insulation. And the time arrival of each signal is different due to its distance from the PD source. The first dominance frequency of the simulation without and with winding and core occur in 1 GHz of frequency. However, the frequency spectrum of simulation with winding and core has a resonance frequency in the low region which is 80 MHz of frequency. This is explained as the winding is considered as a loop antenna]]>
<![CDATA[Antena Kupu - Kupu Sebagai Sensor Ultra High Frequency (UHF) Untuk Mendeteksi Partial Discharge Pada Gas Insulation Substation ]]>
<![CDATA[Hanalde Andre]]>;
<![CDATA[Umar Khayam]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 2 No 2: September 2013 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v2n2.69.2013
<![CDATA[The use of antennas as receiving electromagnetic waves can be used as a tool for the detection of partial discharge (PD) that occurs in high voltage equipment. Especially in the insulation gas substation (GIS), the characteristics of the electromagnetic waves generated lies in the range of ultra high frequency (UHF) in the range of 300 MHz - 3 GHz. Characteristics of the antenna ultra wide band (UWB) is required to detect PD in a wide range. Antenna design is done using a simulation with finite element method or finite element method (FEM). Characteristics of return loss (RL) to be considered in the design of the antenna to get better sensitivity yan. Antenna testing is done with vector network analyzer (VNA). Measurement and simulation results of the modified antennas showed a decrease in the value of RL.Keywords : Partial Discharge (PD), Antena, Ulltra High Frequency (UHF),Gas Insulation Substation (GIS) AbstrakPenggunaan antena sebagai penerima gelombang elektromagnetik dapat digunakan sebagai alat untuk mendeteksi kegiatan partial discharge (PD) yang terjadi pada paralatan tegangan tinggi. Khususnya pada gas insulation substation (GIS), karakteristik gelombang elektromagnetik yang dihasilkan terletak pada rentang ultra high frequency (UHF) dalam rentang 300 MHz – 3 GHz. Karakteristik antena ultra wide band (UWB) diperlukan untuk mendeteksi PD pada rentang yang lebar. Perancangan antena dilakukan menggunakan simulasi dengan metoda elemen hingga atau finite element method (FEM). Karakteristik return loss (RL) antena dipertimbangkan dalam perancangan untuk mendapatkan sensitivitas yan lebih baik. Pengujian antena dilakukan dengan vector network analyzer (VNA). Hasil pengukuran dan simulasi antena yang dimodifikasi menunjukkan penurunan nilai RL. Keywords : Partial Discharge (PD), Antena, Ulltra High Frequency (UHF),Gas Insulation Substation (GIS) ]]>
<![CDATA[Pengaruh Keberadaan Partikel Asing Terhadap Karakteristik Medan Listrik Pada GIS Equilateral Tiga Fasa ]]>
<![CDATA[Rizki Wahyu Pratama]]>;
<![CDATA[Hanalde Andre]]>;
<![CDATA[Umar Khayam]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 10, No 1: March 2021 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v10n1.850.2021
<![CDATA[This paper analyzes the effect of the presence of foreign particles on an equilateral arrangement of 3 phase gas insulated switchgear (GIS) insulation equipment. In this calculation, the electric field characteristics will be analyzed in 3-phase equilateral GIS by varying the location of the particles in the GIS tank. Particles are modeled to have a length of 5 mm and a thickness of 0.5 mm located in a 3 phase GIS equilateral arrangement with a tank diameter of 150 mm and a conductor diameter of 25 mm. The electric field calculations are reviewed at several points in the 3-phase equilateral GIS tank. The simulation and calculation of the electric field were calculated with FEM method software. The results of the calculations show that there are differences in the characteristics of the electric field between normal GIS and GIS where foreign particles are present. The difference in these characteristics can be seen in the magnitude of the electric field, and the ratio of eccentricity from some point of view. Keywords : gas insulated switchgear, equilateral, foreign particles, electric field, eccentricity ratioAbstrakPaper ini menganalisa tentang pengaruh keberadaan partikel asing pada peralatan hubung isolasi gas/ gas insulated switchgear (GIS) 3 fasa susunan equilateral. Pada perhitungan ini, akan dianalisa karakteristik medan listrik pada GIS equilateral 3 fasa dengan memvariasikan letak partikel dalam tangki GIS. Partikel dimodelkan memiliki panjang 5 mm dan ketipisan 0.5 mm terletak di dalam GIS 3 fasa susunan equilateral dengan diameter tangki 150 mm dan diameter konduktor 25 mm. Perhitungan medan listrik ditinjau pada beberapa titik dalam tangki GIS equilateral 3 fasa. Simulasi dan perhitungan medan listrik dilakukan dengan perangkat lunak menggunakan metode FEM. Hasil dari perhitungan menunjukkan adanya perbedaaan karakteristik medan listrik antara GIS normal dengan GIS yang terdapat partikel asing. Perbedaan karakteristik ini dapat dilihat pada besar medan listrik, dan rasio eksentrisitas pada beberapa titik tinjau keberadaan partikel. Kata Kunci : gas insulated switchgear, equilateral, partikel asing, medan listrik, rasio eksentrisitas]]>
<![CDATA[Measurement of Partial Discharge Induced Electromagnetic Wave using Loop Antenna ]]>
<![CDATA[Umar Khayam]]>;
<![CDATA[Fendi Imam Fatoni]]>
<![CDATA[ Proceeding of the Electrical Engineering Computer Science and Informatics Vol 4: EECSI 2017 ]]>
Publisher : <![CDATA[IAES Indonesia Section ]]>
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DOI: 10.11591/eecsi.v4.1026
<![CDATA[Partial discharge (PD) detection by detecting the released energy in the form of electromagnetic (EM) wave during discharge using Ultra-High Frequency (UHF) antenna is one of the methods to determine insulation system quality of power apparatus. The main advantage of UHF PD detection system by using antenna are the capability to detect PD signal without firstly shut down the power apparatus. Therefore, the PD measurement system based on EM wave induced by PD detected by the sensor is needed. First, the sensors which be able to detect PD induced EM wave in ultra wide band need to be designed and manufactured. Second, the characteristics of PD induced EM wave measured by the sensors need to be investigated. This paper deals with measurement of PD induced EM wave by using loop antenna. The results show that the further the distance of loop antenna to PD source is, the lower Vpp is. This is due to EM wave attenuation. At the distance 225 cm from PD source, Vpp of PD is equal to Vpp of the background noise (BGN). Therefore, the maximum distance of the loop sensor to PD source is 225 cm.]]>
<![CDATA[Measurement of Partial Discharge Inside Metal Enclosed Power Apparatus using Internal Sensor ]]>
<![CDATA[Umar Khayam]]>;
<![CDATA[Yushan Yushan]]>
<![CDATA[ Proceeding of the Electrical Engineering Computer Science and Informatics Vol 4: EECSI 2017 ]]>
Publisher : <![CDATA[IAES Indonesia Section ]]>
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DOI: 10.11591/eecsi.v4.1065
<![CDATA[Partial discharge detection by detecting the released energy in form of electromagnetic wave during discharge using Ultra-High Frequency (UHF) antenna is one method to determine insulation system quality in high voltage system. UHF PD detection method has several advantages over conventional PD detection system such as IEC 60270 method. The advantages of UHF PD detection system are the capability to directly detect PD signal without firstly shut down, the installation system and their immunity from environmental noise. Nowadays most of electrical equipment are in form of metal enclosed model. This paper deals with measurement of PD occurrences inside metal enclosed equipment using internal sensor. The loop antenna is used for PD measurement. The experimental results show that the presence of metal box gives significant change on the PD signal detected by using loop antenna. Without metal box, the measurement sensitivity decreases because of the high level of background noise. The metal box acts as electromagnetic wave shielding and reduces the external noise. When the loop antenna placed inside metal box, the measurement sensitivity increases because of the low level of background noise inside metal box.]]>
