Articles

Leakage Current Assessment Using Correlation Coefficient and Principal Component Analysis on The Eight-Month Naturally Coastal Contaminated Outdoor Porcelain Insulator

Jurnal Teknik Elektro Vol 8, No 1 (2008): MARET 2008
Publisher : Institute of Research and Community Outreach

Show Abstract | Original Source | Check in Google Scholar | Full PDF (486.946 KB)

Abstract

This manuscript presents the experimental results of eight months naturally coastal contaminated outdoor porcelain insulator. The conducted experiments were leakage current and applied high voltage measurements, in the hermetically sealed chamber, where temperature, humidity, pressure and applied voltage could be adjusted and measured simultaneously. The leakage current waveforms were analyzed using FFT and the relation to other parameters were analyzed using correlation coefficient and principal component analysis. On high humidity, the leakage current waveforms tended to approach pure sinusoides, and the amplitudes tended to rise. Based on the correlation coefficient, the relative humidity influenced to leakage current amplitudes and phase angle as 0.60 and -0.68 respectively. Whereas, using PCA, the humidity close to power factor, and the phase angle close to THD and applied voltage. However, the phase angle opposites to the humidity. The extracted for 2 and 3 components are 74.5% and 85.3% respectively.

STUDY PENDAHULUAN SESAR OPAK DENGAN METODE GRAVITY (STUDY KASUS DAERAH SEKITAR KECAMATAN PLERET BANTUL)

BERKALA FISIKA Vol 14, No 1 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (540.42 KB)

Abstract

The reconnaissance research to predict the position and the type of Opak Fault in surrounding subdistrict Pleret area was carryout by gravity method. It done by measured the intensity of gravity field. The measurement was done in five lines  cross the Opak Fault which indicated in the geological map. The intensity of gravity field  in the surround of subdistrict Pleret area are measured by la-coste Romberg  Gravitymeter,  the latitude are measured by GPS Trimble, and the position are measured by GPS Garmin III Plus. The measurement was done in five lines which separated abaut 2,5 km and about 20 km in length. The distance of observations are about 0,5 km to 1 km. The data which be collected are reduction by drift and tidal correction, free air correction, bouger correction and terrain correction. The corrected data are made bouger anomaly contour. The result of this research by kwalitative interpretation are estimated that  the location of Opak Fault in the eastern part of the position of Opak Fault which indicated in the geological map. The type of opak fault are normal fault, because can be detected by gravity method. Key words : Opak Fault, Pleret, gravity method. 

Inventarisasi Potensi Daya Saing Spasial Lahan Rawa Lebak untukPengembangan Pertanian di Sumatera Selatan

Jurnal Lahan Suboptimal Vol 1, No 1 (2012)
Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

Show Abstract | Original Source | Check in Google Scholar | Full PDF (407.465 KB)

Abstract

Waluyo, Alkasuma, Susilawati, Suparwoto. 2012 Spatial Inventory of Potential Competitiveness Swamp Land for Agricultural Development in South Sumatra. J. Lahan Suboptimal 1(1):64-71. Swampy marsh land has great competitive advantage for farmland development.The purposes of this study were 1)to identify the spread of potential swampy marsh land for food crops in major production centers; 2)to understand thecontent, quantity,and distribution of minerals essential for health in the low lands of South Sumatra. Data were collected through some surveys using transects (toposequen), including delineation of maps, flooding/ground water, state of the microrelief, soilbase material, land use, and land surface condition. Ground observations were based on the Soil Survey Manual. The results indicated that Sungai Pinang and Rantau Panjang has three types of swampy land, namely shallow swampy marsh, mid marsh low lands, and swamps in the low lands. Swampy marsh as the potential competitiveness for its antioxidant mineral deposit (Fe, Mn, Cu, Zn, and Se) can produce good functional food products such as Padi seputih, Pelita Rampak, Ketan Sinde, Padi Petek. These varieties have considerably high antioxidant mineral. Therefore, the use of swampyland must be directed. Shallow and intermediate wetlands can be used for rice, pulses and vegetables whereas deep wetlands are suitable for fishing.

Perbandingan keanekaragaman spesies dan kelimpahan arthropoda predator penghuni tanah di sawah lebak yang diaplikasi dan tanpa aplikasi insektisida

Jurnal Entomologi Indonesia Vol 5, No 2 (2008): September
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Original Source | Check in Google Scholar | Full PDF (175.272 KB)

Abstract

Studies on soil-dwelling predatory arthropods were carried out in lowland areas of South Sumatra, with objectives to analyze the species diversity and abundance of the predatoryarthropods inhabiting fields applied by synthetic insecticide, bioinsecticide, and without insecticide application. The predatory arthropods were sampled using pitfall traps. Indices of diversity and community similarities were applied to analyze the data. Results indicated that the arthropods inhabiting field without insecticide application had the highest diversity and abundance compared to other treatments. Predatory community similarities between those on the field without insecticide application and applied by bioinsecticide were higher compared to the fields applied by synthetic insecticide.

Analisis Pengaruh Ketidakseimbangan Kondisi Beban terhadap Harmonik Arus dan Faktor Daya Generator Sinkron Tiga Fasa

REKA ELKOMIKA Vol 1, No 3 (2013)
Publisher : REKA ELKOMIKA

Show Abstract | Original Source | Check in Google Scholar

Abstract

Abstrak Harmonik adalah deretan gelombang arus atau tegangan yang frekuensinya merupakan kelipatan bilangan bulat dari frekuensi dasar arus atau tegangan itu sendiri. Adanya harmonik ini dapat mempengaruhi faktor daya dan kinerja dari peralatan-peralatan listrik yang terpasang pada sistem, terutama pada sumber penghasil energi listrik itu sendiri yaitu generator, hal itulah yang mendasari dilakukannya studi analisis ini.Untuk menganalisisnya, maka dilakukanlah penelitian terhadap salah satu kondisi sistem kelistrikan yang dapat menimbulkan harmonik arus pada sistem tersebut yaitu ketidakseimbangan kondisi beban. Proses penelitian dilakukan dalam empat tahapan, yaitu pengukuran tegangan, arus dan faktor daya generator, pengambilan datagelombang harmonik arus beban, pengolahan data harmonik arus beban dan analisis. Hasil yang diperolehmenunjukkan bahwa pada saat kondisi beban seimbang, kandungan harmonik arus beban berkisar (0.2-7.3%) dengan faktor daya (0.13-0.98), sedangkan pada saat kondisi beban tak seimbang, kandungan harmonik arus beban berkisar (0.8-8.4%)dengan faktor daya (0.11-0.75). Kata Kunci: Ketidakseimbangan kondisi beban, harmonik arus, faktor daya. Abstract Harmonics are periodic distortion of sinusoidal voltages or currents whose frequencies are integer multiples of its fundamental frequency. The presence of these harmonics in the power system will give negative effect to power factor and electrical power quality, especially the source of that electrical energy itself, which is generator, and that is the reason why this analysis study was done. To analyze it, a research to one of electrical system condition (unbalanced load condition) that can cause current harmonics was conducted. This research was done in four steps;voltages, currents and power factor measurement, load current harmonics waveform data recording, load current harmonics data processing and analysis. The result shows that under balanced load condition, the total of load current harmonics ranges from (0.2-7.3%) with its power factor (0.13-0.98), while under unbalanced load condition, the total of load current harmonics ranges from (0.8-8.4%) with its power factor (0.11-0.75). Keywords: Unbalanced load condition, current harmonics, power factor.

Analisis Arus Transien Transformator Setelah Penyambungan Beban Gedung Serbaguna PT "X"

REKA ELKOMIKA Vol 1, No 1 (2013)
Publisher : REKA ELKOMIKA

Show Abstract | Original Source | Check in Google Scholar

Abstract

ABSTRAK Peristiwa alih hubung pada suatu rangkaian listrik menyebabkan adanya sentakan tegangan dan arus yang disebut dengan arus transien. Saat terjadi transien komponen-komponen mengalami tekanan yang sangat besar berupa tegangan dan arus terutama pada transformator yang mensuplai beban, hal ini menyebabkan penurunan waktu kerja transformator tersebut. Dengan membandingkan hasil data berupa kurva gelombang arus transien beberapa tipe beban dengan SPLN 64 : 1985 pasal enam mengenai pengaman trafo distribusi terhadap arus transien inrush dan beban peralihan. Berdasarkan hasil simulasi beberapa tipe beban,  arus masuk awal maksimum terjadi  pada beban lampu  tabung sebesar 1531,81Ampere dalam selang waktu 0,01 detik. Selama 2,066 detik, tipe beban lampu  pijar mendekati batas ketahanan transformator sebesar 867,41 Ampere setara dengan 2,17 kali lipat dari arus nominal dari batasan sebesar 3 kali lipat dalam waktu 10 detik. Sesuai dengan standar (SPLN 64:1985), transformator masih berada dalam kondisi batas aman.Kata kunci : Arus Transien, Ketahanan Transformator,  Jenis Beban.ABSTRACT The surge of voltage and current due to switching operations in electrical circuit is called the transient current. Components are run into high pressure of voltage and current, especially in transformer that supplying the load. It can  lead to the reduction of transformer working time. The curve of transient current wave from any type of  loads will be compared with SPLN 64 : 1985 sixth article about transformer distribution safety from transient  inrush current and load switching. Based on simulation result in any load types. Maximum inrush current occur in tube lamp load equal to 1531,81 Ampere within 0,01 second. For 2,066 second, maximum incandescent lamp load current is close to the transformer withstand of 867,41 Ampere. It’s equal to 2,17 fold from nominal current of 3 fold within 10 seconds about the transformer withstand. According to SPLN (64 : 1985), transformer reserve supply side is still safe.Keywords : Transient Current, Transformer withstand, load  type.

PERANCANGAN DAN REALISASI LISTRIK WIRELESS MENGGUNAKAN RESONANT COUPLING MAGNETIC

REKA ELKOMIKA Vol 1, No 1 (2013)
Publisher : REKA ELKOMIKA

Show Abstract | Original Source | Check in Google Scholar

Abstract

ABSTRAK   Transfer energi listrik dapat dilakukan dengan metoda resonansi, yaitu dengan menyamakan frekuensi pada sisi pengirim (transmitter) dengan sisi penerima (receiver). Frekuensi yang digunakan adalah 22 khz yang dihasilkan pada rangkaian inverter setengah gelombang dengan tegangan output 100 Vac, dihubungkan dengan kapasitor dan kumparan pengirim. Pada listrik wireless ini dilakukan tiga kali percobaan yaitu kumparan pada 50 lilitan, 30 lilitan dan 20 lilitan. Ini dilakukan untuk mengetahui besar impedansi yang dihasilkan, yang berpengaruh untuk transfer energi listrik. Untuk kumparan optimalnya adalah 20 lilitan, Karena pada 30 dan 50 lilitan impedansi yang dihasilkan lebih besar dari pada 20 lilitan. Jarak transfer maksimal dari kumparan pengirim (transmitter) kepada kumparan penerima (receiver) adalah 25 cm dengan tegangan 6,32 Vac dan jarak minimal adalah sebesar 10 cm dengan tegangan 15,6 Vac. Ini membutikan jika jarak semakin jauh maka tegangan semakin kecil dan daya pancarnya semakin kecil dan jika jaraknya semakin dekat  maka tegangan semakin besar. Kata kunci: induksi, wireless, jarak ABSTRACT Electricity Energy Transfer can be done with the method resonansi, that is with frequency on the sender side equalize (transmitter) with a side of receiver (receiver). The frequency used is 22 khz resulting in a series of half-wave voltage inverter with 100 Vac, output is connected to the capacitor and the coil is the sender. Wireless electricity is conducted at three times the experiment is at 50 coil, 30 coil and 20 coil. This is done to know the large impedance is produced, the influential for the transfer of electrical energy. For optimal coil is a coil 20, because at 30 and 50 coil impedance resulting is greater than 20 coils.Transfer maximum distance of the coil the sender (transmitter) to coil the recipient (receiver) is 25 cm to voltage 6,32 Vac and a minimum distance is as much as 10 cm to voltage 15,6 Vac. This proves that if the far distance then the smaller voltage and if the distance getting closer voltage so thet the emissitivity is getting better. Keywords: induction, wireless, distance

Studi Load Shedding pada Sistem Kelistrikan Pengeboran Minyak Lepas Pantai, Kasus di Perusahaan X

REKA ELKOMIKA Vol 1, No 2 (2013)
Publisher : REKA ELKOMIKA

Show Abstract | Original Source | Check in Google Scholar

Abstract

ABSTRAK Perubahan beban yang signifikan pada sistem kelistrikan dapat menyebabkan suatu sistem berjalan diluar batas stabil, Sehingga stabilitas sistem pada sistem kelistrikan sangat diperlukan, hal itu merupakan tujuan dilakukannya pembahasan kasus ini. Untuk menanggulangi suatu sistem agar mencapai kestabilan tersebut dilakukan proses load shedding dengan mengambil beberapa contoh asumsi menggunakan software simulasi dengan setting batas kerja UFR pada sistem untuk melakukan load shedding yang ditujukan jika terjadi perubahan frekuensi diluar batas standar perusahaan, dengan cakupan analisa pada saat generator load flow beban normal, saat kondisi pemasukan beban terbesar yaitu 1500HP, dan saat salah satu generator mengalami trip di t=1s dalam rentang waktu simulasi 100s, dengan melihat kinerja sistem dari sisi speed generator, perubahan frekuensi dengan melihat standar frekuensi yang diperbolehkan dengan rujukan dari pelepasan beban dari ANSI/IEEE C37 106-1987 dan perubahan tegangan dengan standard dari perusahaan adalah ±10%. Hasil yang didapatkan saat GTG trip, UFR bekerja di 58,5Hz dan 58,2Hz dengan total pelepasan beban sebesar 2727,25Kw, dan steady state pada t=80,011s. Kata kunci : Stabilitas sistem, Pengeboran minyak lepas pantai, Load Shedding. ABSTRACT In the Electrical System often occurs a change in load can cause a system goes beyond the limit of stability, because about that the stability system is important, so that the stability system must be need to be explain in here. To make system back to stabil, the load shedding can be use by taking a few examples of assumption with simulation is used software include setting UFR to make loadshedding work when GTG(01) collapse and frekuensi turn down. Desired results of this project used multiple data methods with the electrical systems associated look in to perform of synchronous generator, the system stability, and load shedding, that is doing by some case is reviewed the ability of generator at load flow condition normal, while the biggest load condition start is 1500HP, and while one generator having trip at t=1s in the 100s simulation period, and seen the response look at the performance of speed generator system, and changes frequency by looking at the standard frequencies allowed by referral from load shedding of ANSI/IEEE C37 106-1987 and for changing from voltage used company’s standard is ±10%. The result is, when GTG(01) collapse, then UFR will work at frequency 58,5Hz dan 58,2Hz with total final load shedding is 2727,25Kw, and steady state at time t=80,011s Key word: Stability system, Load shedding, offshore.

Pengaruh Persepsi Kegunaan, Persepsi Kemudahan, Kecepatan, Keamanan 75 dan Kerahasiaan Serta Kesiapan Teknologi Informasi Wajib Pajak terhadap Penggunaan e-Filing Bagi Wajib Pajak Orang Pribadi Di Kota Tangerang, Kecamatan Karawaci

ULTIMA Accounting Vol 8 No 1 (2016): Ultimaccounting: Jurnal Ilmu Akuntansi
Publisher : Universitas Multimedia Nusantara

Show Abstract | Original Source | Check in Google Scholar | Full PDF (897.05 KB)

Abstract

The objective of this research was to examine the effect of perceived usefulness, perceived ease of use, speed, security and privacy and readiness technology tax payers information to e-Filing usage. The object of this study is the individual tax payers in Tangerang City, Karawaci District. The selection of the sample is determined based on convenience sampling method. Data used in this study was primary data, id est: questionnaires. The respondent in this study were 110. Data analysis technique in this study using multiple linear regression. The result of this study were (1) perceived usefulness have a significant impact towards e-Filing usage; (2) perceived ease of use have a significant impact towards e-Filing usage; (3) speed does not have a significant impact towards e-Filing usage; (4) security and privacy does not have a significant impact towards e-Filing usage; (5) readiness technology tax payers information does not have a significant impact towards e-Filing usage; (6) perceived usefulness, perceived ease of use, speed, security and privacy and readiness technology tax payers information all simultaneously, have a significant impact towards e-Filing usage. Keywords: e-Filing usage, perceived usefulness, perceived ease of use, readiness technology tax payers information, security and privacy.

Kompresor Angin Terintegrasi Berbasis Mikrokontrol PIC 16F877 Dengan User Interface VB 6.0

JREC (Journal of Electrical and Electronics) Vol 1, No 1 (2012): JREC (Journal of Electrical and electronics)
Publisher : JREC (Journal of Electrical and Electronics)

Show Abstract | Original Source | Check in Google Scholar

Abstract

Integrated air compressor is a system to integrate some air compressor become one unity which is supporting each other. In this system used microcontrol PIC 16F877 as compressor hardware controller and VB 6.0 as interface between compressor and user. Integrated air compressor to be designed as solution problems of arising out at conventional compressor system with damage storey level which enough high as effect of over loading, over running and over themperature. Result of test from prototype show that the design tool is good relation between compressor one with other in a integrity which each other to backup when failure execute and also not good in performance, so that this system enough effective to depressing its damage of compressor as effect of over loading, over themperature and overrunning.Keywords : Integrated air compressor, PIC 16F877, user interface VB 6.0, over loading, over themperature and over running.

Co-Authors A G Thamrin Abdul Haris Setiawan ADITYA FITRIANSYAH Afrian Enggal Laksono Afriyanah, Afriyanah Agus Kristiyanto AHMAD ZAKKY ZAKKY RI’AYATULLAH1 ALINDA NOVITA SARI, ALINDA NOVITA Alkasuma Alkasuma Andra Noviana, Andra Andriya Dwi Pramesianto, Andriya ARIO AMRI IHSAN, ARIO AMRI Aryanti Nurhidayati Ayu Intan Sari Ayuningtyas, Cita Eri BAMBANG ANGGORO Chandra Irsan Deden Tarmidi, Deden DERI MUHAMAD NURENDI, DERI MUHAMAD DERIL ALVIAN PERMANA, DERIL ALVIAN Devina, Shelby Dewi Oktaviani, Dewi Dewi Septyarini Emma, Suri Estuningsih, S. P. Furqon Hidayatullah, Furqon Guwat, Suparwoto Hasyimi, Mochammad Herawan, Lavenia Hidayatullah, Eltha IHFAZH NURDIN EKA NUGRAHA IKA MUTIARA AGUSTIN, IKA MUTIARA ISMAIL CUMENTAS Ismail, Elza Jumakir Jumakir Kirbani Sri Brotopuspito Lingga Pracna P M Irham Nurwidyanto Maman A. Djauhari Marchelly, Nancy Mardiana Mardiana Melando, Nelinda NANDANG TARYANA NASRUN HARIYANTO NATHALIS TIMBIRI Ngapuli Irmea Sinisuka, Ngapuli Irmea Ningsih, Dwi Ratna Parouli M. Pakpahan Priatna Priatna Purnomo, Sapto R Gunawan Sudarmanto RAMDHANI RAMDHANI RHAMANDITA SUDRAJAT RIKI ARNANDO, RIKI Safitri, Fenthy Marlina Saputra, Andrianto Serly Sovia Lajuba, Serly Sovia Sismanto Sismanto SITI HERLINDA SITI SAODAH Sri Sumarni Sudaryanto Djamhari SUDARYANTO SUDARYANTO Sudjarwo Sudjarwo Sugeng Sugeng Sukatiman Sukatiman Sukijo Sukijo Suparwoto Suparwoto Supriyono Supriyono Susetyowati Susetyowati, Susetyowati Susilawati Susilawati Suwarno Suwarno Suwarto Suwarto Suyitno Suyitno SYAHRIAL SYAHRIAL SYLVIA OKTOBELLA PUSPITASARI, SYLVIA OKTOBELLA TAUFIK ISMAIL AR, TAUFIK ISMAIL TEGUH ARFIANTO TRIWAHYU RUBIANTO Valdera Yudistira, Valdera YUDA YUANDHITRA, YUDA