Yul Martin
Department of Electrical Engineering Faculty of Engineering, Universitas Lampung Jl. S. Brojonegoro 1, Bandar Lampung, 35145

Published : 6 Documents
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Penentuan Kapasitas Arus Surja Alat Proteksi Petir (SPDs) Yang Dibutuhkan Sebuah Gedung Yang Tersambar Petir Secara Langsung

Electrician Vol 2, No 3 (2008)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

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Abstract

If lightning rod of building is directly struck by lightning, then lightning current will flow through lightning rod, down conductor and then through bonding bar. Lightning current will be distributed to lines that are connected with the bonding bar, among other things: grounding electrode, plumbing, power line, telephone line and other conductors are connected to the bonding bar in the building. Lightning current distribution on a building is different from other buildings, depending on the existing conductor lines in the building. Therefore, before installing SPDs at the lightning protection system on a building must first calculate the lightning current distribution in the building to determine the maximum current surja be borne by SPDs. In this study conducted determining the maximum lightning current capacity of the SPDs that required every conductor lines in the building by calculating the ligtning current distribution. Variables that cause changes on distribution lightning current was varied to obtain the maximum lightning current that bear by SPDs. The calculation is done by using EMTP program. The results showed that when the building directly struck by lightning, not all lightning current flow into the grounding but will be distributed to the existing conductor lines in the building. The results showed that out of five cases calculated, the largest lightning current flow into power lines are 7.29 kA and the largest lightning current through the telephone line is 50.9 kA. Key words: Lightning current, SPDs, EMTP

Pendeteksian Beragam Sumber Peluahan Sebagian dengan Menggunakan Metode Elektromagnetik

Electrician Vol 8, No 3 (2014)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

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Abstract

Intisari - Energi listrik merupakan salah satu energi yang dibutuhkan oleh masyarakat. Sumber energi listrik dihasilkan oleh pembangkit tenaga listrik. Komponen penting dalam pembangkit tenaga listrik adalah tranformator. Penggunaan transformator secara terus menerus dapat menyebabkan kegagalan isolasi dan rusaknya transformator. Pada saat sebelum terjadinya kerusakan, terjadi proses peluahan sebagian pada isolasi tegangan tinggi. Peluahan sebagian yang terjadi secara terus menerus pada suatu bahan isolasi dapat mengakibatkan break down, hal ini karena adanya tekanan medan magnet pada sumber peluahan sebagian. Peluahan sebagian terdiri dari peluahan sebagian permukaan, rongga dan korona. Analisis peluahan sebagian dilakukan pada tiga jenis sumber peluahan, yaitu peluahan permukaan, rongga dan korona. Penggunaan sumber peluahan yang berbeda bertujuan untuk mengetahui perbedaan karakteristik dari masing masing sumber peluahan. Perbedaan karakteristik masing-masing sumber peluahan dianalisis berdasarkan amplitudo, durasi sinyal dan frekuensi peluahan yang menghasilkannya. Data yang dihasilkan berupa gelombang peluahan yang didapat dari osiloskop. Data yang dihasilkan diolah dengan menggunakan software matlab sehingga dapat ditentukan karakteristik amplitudo, durasi peluahan dan frekuensi masing-masing sumber peluahan. Dari hasil analisis diketahui bahwa amplitudo dan durasi waktu terlama terjadi pada korona dan frekuensi terbesar terjadi pada peluahan permukaan. Karakteristik  peluahan sebagian bergantung pada sumber  peluahan yang menghasilkannya. Kata Kunci - Beragam sumber peluahan, karakteristik amplitudo, durasi peluahan dan frekuensi. Abstract - Electrical energy is one of the energy that needed by the humans. Sources of electrical energy generated by the power plant. The important component in the generation of electric power is transformer. Transformer that was use continuously will give effect for insulation failure and damage to the transformer. At the time before the occurrence of the damage, discharge process occurs mostly at high voltage isolation. Partial discharge occurs continuously in an insulating material can lead to break down, it is because of the pressure of the magnetic field at the source of most of the partial discharge. Partial discharge are partly composed of mostly surface discharge, void and corona. Analysis of discharge partially performed on three types of discharge sources, which discharge surface, void and the corona. The using of variuos source discharge aims to find differences in the characteristics of each discharge source. The different characteristics of each discharge source is analyzed based on the amplitude, discharge duration and frequency of discharge signals that produce it. Data that generated was the wave discharge obtained from the oscilloscope. That data were processed using matlab software to determine which characteristics of amplitude, duration and frequency of each source discharge. From the results show that the longest time and the maximum amplitude occurs in corona, but the maximum frequency occurs in the surface discharge. Partial discharge characteristic’s depends in part on the source that produced it. Keywords - Various sources of discharge, the characteristic amplitude, duration and frequency.

Analisis Perbandingan Shielding Gardu Induk Menggunakan Model Electrogeometric

Electrician Vol 9, No 3 (2015)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

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Abstract

Intisari — Sistem perlindungan gardu induk dari sambaran petir merupakan hal yang sangat penting bagi sistem kelistrikan, dimana gardu induk terdapat peralatan listrik yang berfungsi untuk mentransformasikan tenaga listrik tegangan tinggi yang satu ke tegangan tinggi yang lainnya. Untuk menjaga agar peralatan pada gardu induk terhindar dari kerusakan akibat sambaran petir, maka digunakan sistem perlindungan. Sistem perlindungan yang digunakan yaitu shielding tiang penangkal (mast) dan shielding kawat pentanahan / ground steel wire (GSW). Nilai ketinggian minimum tiang penangkal dan kawat dihasilkan menggunakan persamaan Young, Brown Whitehead - CIGREE, IEEE 1992 dan IEEE 1995 dalam model electrogeometric. Pada model electrogeometric dilakukan variasi nilai ketinggian objek yang dilindungi untuk memperlihatkan nilai ketinggian minimum yang diperlukan. Sehingga penelitian ini membandingkan ketinggian minimum yang dihasilkan antara shielding tiang penangkal (mast) dan shielding kawat pentanahan / ground steel wire (GSW) berdasarkan model electrogeometric dari objek yang dapat dilindungi. Dari hasil analisis didapatkan bahwa shielding kawat pentanahan / ground steel wire (GSW) mampu memberikan daerah perlindungan yang lebih baik dan lebih besar dengan ketinggian minimum yang diperoleh yaitu lebih rendah. Selain itu, model electrogeometric dengan persamaan Young secara umum mampu melindungi semua peralatan yang divariasikan mulai dari 1 m sampai 13 m dengan nilai ketinggian minimum yang diperoleh paling rendah dibanding persamaan lainnya. Kata kunci—Shielding Gardu Induk, Model Electrogeometric, Mast, Ground Steel Wire (GSW) Abstract — Protection system substation from a lightning strike is very important for the electrical system, where substation there are electrical device which function to transform electricity high voltage by high voltage other. To keep the equipment in substation protected from damage cause by lightning strikes, then used the protection system. Protection system used is shielding mast and shielding wire / grounding of steel wire (GSW). The minimum height values of mast and wire produced using the equation Young, Brown Whitehead - CIGREE, IEEE 1992 and IEEE 1995 model electrogeometric. On the model electrogeometric done variation of the height object protected to show the value of the minimum height required. So this research compare the minimum height the resulting between shielding mast and shielding wire / grounding of steel wire (GSW) based on a model electrogeometric of the object that can be protected. From the results of analysis show that shielding wire / grounding of steel wire (GSW) is able to give better protection zone and larger with a minimum height obtained is lower. In addition, model electrogeometric with the equation Young in general able to protect all the equipment varied from 1 m to 13 m with a minimum height values ​​obtained the lowest compared to other equations. Keywords—Substation Shielding, Electrogeometric Model, Mast, Ground Steel Wire (GSW)

Analisa Harmonisa Akibat Pengaruh Penggunaan Converter pada Kereta Rel Listrik 1x25 kV Jogyakarta-Solo

Electrician Vol 9, No 3 (2015)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

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Abstract

Intisari — Sebagai alat transportasi yang dapat menampung penumpang lebih banyak, Kereta Rel Listrik (KRL) harus memilki sistem kerja yang baik guna menunjang kebutuhan akan sarana transportasi massal di Indonesia. Namun, akibat penggunaan beban non linier pada sistem kerja Kereta Rel Listrik dapat menimbulkan masalah dalam sistem yaitu menyebabkan harmonisa yang dapat mengakibatkan penurunan kualitas daya pada sistem. Salah satu contohnya adalah converter yang terdapat pada sistem Kereta Rel Listrik Jogyakarta- Solo.yang dapat menghasilkan distorsi harmonisa sehingga peralatan dapat menjadi lebih panas bahkan dapat mengalami kerusakan. Oleh karena itu untuk mengetahui besarnya nilai harmonisa pada sistem tersebut diperlukan analisa serta merancang suatu alat guna mengatasi permasalahan harmonisa tersebut. Untuk mengatasi masalah harmonisa yang terjadi pada sistem dipasang peralatan berupa filter pasif jenis singel tuned filter.Pemasangan filter pasif ini dipasang pada bus converter, transformator serta bus beban motor untuk mereduksi harmonik orde 5. Hasil simulasi menunjukkan pemasangan singel tuned filter dapat menurunkan nilai arus maupun tegangan harmonisa Setelah dipasang filter, arus bus converter naik 0,03%, dan tegangan turun sebesar 8%, bus transformator arus turun 0,3%, serta tegangan turun 44,71% dan arus bus beban motor turun 19,85% sedangkan tegangan turun 43,91%. Kata kunci— Distorsi Harmonisa, Converter, singel tuned filter Abstract — As a means of transportation that can accommodate more passengers, Electrical Railway (KRL) needs to have a good working system to support the need for mass transportation in Indonesia. However, due to the use of non-linear load on Electrical Railway systems work can cause problems in the system that is causing the harmonics that can lead to decreased quality of power on the system. One example is contained in the converter Electrical Railway system Jogyakarta-Solo. can produce harmonic distortion that equipment can be more heat can even be damaged. Therefore, to determine the value of harmonics in the system is required analysis and design a tool to overcome the problems of the harmonics. To overcome the problem of harmonics that occur on the system is installed the equipment in the form of a passive filter tuned filter. Single type of passive filter is installed in the bus load converters, transformers and motors to reduce the harmonic order of 5. The simulation results show the installation of the single tuned filter can reduce the value of current and voltage Once installed filter harmonics, the current on bus of converter up 0.03%, and a voltage down 8%, a bus of the transformer,the current down 0.3%, and 44.71% of voltage down and the current on bus load of the motor down 19.85% while voltage down 43.91%. Keywords— Harmonic distortion, Converter, singel tuned filter

Electromagnetic interference shielding in unmanned aerial vehicle against lightning strike

TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 2: April 2019
Publisher : Universitas Ahmad Dahlan

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Abstract

Electromagnetic interference (EMI) due to lightning strike in Unmanned Aerial Vehicle (UAV) became a critical issue, since it could cause a severe damaged to electronic equipment which was installed in UAV. This paper proposed a method to reduce EMI by creating shield over the body of UAV with aluminum foil with thickness 0.15mm. A standard lightning impulse-voltage generated by impulse generator was delivered to the high voltage (HV) electrode at a particular distance from UAV. Indirect effect of lightning strike was investigated by measuring induced voltage inside the compartment of UAV fuselage during flashover between the HV electrode and UAV. Flashover between the HV electrode and UAV simulated the lightning strike. The result showed that the highest voltage only 1V at UAV compartment when 150kV impulse voltage supplied to the electrode with striking area on the wing. The measured voltage was far below 100V as the insulation level of low voltage equipment inside UAV. Although the direct effect of lightning has created a burning hole on the surface aluminum foil with thickness 0.15mm, the effect was overcome by increasing the thickness to 0.3mm. The application of aluminum foil over the surface of UAV repelled the electromagnetic interference which acted as a Faraday cage. The shielding method was successfully reduced the effect of EMI.

DASHBOARD PENGAWASAN BESARAN LISTRIK WAKTU NYATA

Barometer Vol 4, No 1 (2019): Barometer
Publisher : Universitas Singaperbangsa Karawang

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Abstract

Masyarakat modern cenderung memakai listrik secara kontinyu. Dan, tergantung dari pemakaian, besaran listrik yang dipakai berubah seiring waktu. Nilai besaran listrik harus berada dalam batasan tertentu agar sistem yang bekerja menggunakan listrik dapat berfungsi dengan baik. Selain itu, teknologi hijau mendorong pemakaian listrik optimal sesuai dengan keperluannya. Tetapi, pengukuran konvensional untuk nilai besaran listrik terpakai tidak efisien, pengecekan dilakukan berkala dan harus ditera langsung pada perangkat pengukur seperti meteran listrik. Dan, pada sistem tenaga listrik yang lebih kompleks seperti sistem tiga fasa dapat terjadi fluktuasi perubahan beban, ketidakseimbangan beban pada tiap fasa, mau pun keadaan abnormal yang terjadi dalam rentang yang singkat. Sehingga, kebutuhan informasi pemakaian besaran listrik waktu nyata diperlukan. Penelitian untuk Dashboard Pengawasan Besaran Listrik Waktu Nyata dilakukan dengan tujuan melakukan pengawasan terhadap besaran listrik terpakai. IoT (Internet of Things) dimanfaatkan untuk mendapatkan data mengenai besaran listrik seperti Tegangan, Arus, Daya, Faktor Daya, dan Energi. IoT kemudian mengirimkan data besaran listrik ke server basis data yang kemudian diakses oleh Dashboard untuk disajikan dalam grafik yang mudah dipahami.