Yuniarto Yuniarto, Yuniarto
PSD III Teknik Elektro Fakultas Teknik, Universitas Diponegoro Jl. Prof. Sudharto, SH, Kampus UNDIP Tembalang, Semarang 50275, Indonesia

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APLIKASI SMART CARD PADA METERAN AIR DIGITAL PRABAYAR BERBASIS ARDUINO MEGA 2560 Rafik, Adhila; Yuniarto, Yuniarto
Gema Teknologi Vol 18, No 1 (2014): April 2014 - October 2014
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.422 KB) | DOI: 10.14710/gt.v18i1.8813

Abstract

Adhila Rafik, Yuniarto, in paper smart card application in prepaid digital water meter based on arduino mega 2560  explain that water is a daily necessity, to get a decent clean water to be used, we can use the services of the service taps to get water, but the post-pay payment method used taps raises its own problems, namely the problem of payment arrears. To resolve the issue of payment methods can be converted to a prepaid system, so the use of water dilakuakn after the user makes a payment in advance, many prepaid methods, one of which is the smart card is a plastic card in which there is a microcontroller chip that makes it possible to encrypt the data that there didalamya so not just anyone can read and menulisa data into the card, the use of smart cards as a payment method for a digital prepaid water meter taps, can overcome the problem of payment arrears. Because the use of RFID technology allows the User just close the smart card reader to its user. Keywords: smart cards, prepaid, RFID
PENGARUH PANJANG SALURAN TRANSMISI TERHADAP TEGANGAN LEBIH TRANSIENT YANG DISEBABKAN KARENA PROSES ENERGIZED PADA SALURAN TRANSMISI 500 KV Yuniarto, Yuniarto
Gema Teknologi Vol 17, No 4 (2014): October 2013 - April 2014
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.049 KB) | DOI: 10.14710/gt.v17i4.8934

Abstract

Yuniarto, in this paper explain that the utility of high transmission line result in the transient over voltage in transmission-line will also increasingly higher, mainly for lightning and switching surge. Switching surge is a dominant factor to show up much transient over voltage in the transmission-line in the level of 230 kV or higher, if it is compared with lightning surge.  Switching surge is caused by single energized process, the process itself to energize a transmission line in no load condition with energy power through switch closure operation. The research was aiming at observing the influence of transmission-line length to transient over voltage that occurred at the energized process in 500 kV transmission line Ungaran-Pedan, which used EMTP (Electromagnetic Transients Program) to simulate it.  The result of simulation showed that the transient over voltage occurred along the transmission-line which caused the higher voltage increase, providing that the line is also longer. Key word : over voltage,  transient, EMTP
APLIKASI JAVA DAN MYSQL PADA SISTEM INFORMASI MINIMARKET Sanjaya, David Robby; Yuniarto, Yuniarto
Gema Teknologi Vol 17, No 2 (2013): October 2012 - April 2013
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (337.97 KB) | DOI: 10.14710/gt.v17i2.8920

Abstract

David Robby Sanjaya, Yuniarto, in paper java and mysql application at minimarket information system explain that an endless human needs combined by their daily activities, made a lot of people reluctant to do shopping at a traditional market.  Minimarket or supermarket that finally became a way out for this problem, because it had a good management system for organized the items and the transactions. Regulation of items and money at minimarket or supermarket require a good software.  There are a lot of programming language that can be used for create this software, one of that is Java programming language.  Java in this information system be used for create an interface to user while Mysql be used to manage a databases. Java programming language, Mysql, Netbeans and iReport are tools that applied to this Minimarket  information system. Keywords: Minimarket Information System, iReport, Java, Mysql, Netbeans.
KOREKTOR FAKTOR DAYA OTOMATIS PADA INSTALASI LISTRIK RUMAH TANGGA Yuniarto, Yuniarto; Ariyanto, Eko
Gema Teknologi Vol 19, No 4 (2018): October 2017 - April 2018
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (650.971 KB) | DOI: 10.14710/gt.v19i4.19153

Abstract

TL lamps, electric motors, Air Conditioner (AC), and other electrical equipment which is widely used for industry and households. Where all the electrical equipment is a burden that is inductive. As a result of the use of an inductive load, causing the falling value of the electrical power factor mounted on the customer can not be used optimally. To overcome this, in this thesis, has created a tool to correct the power factor value automatically. To improve the power factor, is used capacitors mounted in parallel to the load. By using the integrator, it can be obtained how large capacitor must be mounted parallel to the load according to the inductive load changes resulting in improved power factor value. Test results showed that an increase in the value of power factor from 0.34 to 0.95.
PROFIL SURJA HUBUNG KARENA PROSES ENERGIZED (PEMBERIAN TENAGA) PADA SALURAN TRANSMISI 500 KV Yuniarto, Yuniarto
Gema Teknologi Vol 16, No 1 (2010): April 2010 - October 2010
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (135.904 KB) | DOI: 10.14710/gt.v16i1.364

Abstract

Yuniarto, in this paper explain that transient over voltage that happened because switching surge have tobe paid attention to don't cause the damage equipments of insulation coordination system. This research aim toperceive the transient over voltage at the end of 500 kv transmission line caused energized process by using EMTP(Electromagnetic Transients Program) as toll to simulate the energized process. Data for this research was takenfrom 500 kv transmission line Ungaran-Pedan. From this research was expected can become a reference for powercompany in planning insulation coordination at transmission line.Result of research show that transient over voltage at the end of 500 kv transmission line caused energizedprocess reach more or less twice its nominal voltageKey word : energized, karateristik, transient over voltage, EMTP
RANCANG BANGUN SIMULASI DISPLAY ARUS GANGGUAN RELAI PROTEKSI SEL 551 DI MASTER STATION PADA SCADA SURVALENT SEBAGAI UPAYA MEMPERBAIKI SAIDI Azhar, Dzulfikar Muhammad; Yuniarto, Yuniarto
Gema Teknologi Vol 18, No 2 (2015): October 2014 - April 2015
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (293.686 KB) | DOI: 10.14710/gt.v18i2.8976

Abstract

Dzulfikar Muhammad Azhar, Yuniarto, in this paper explian that disruption of the power distribution network of 20 KV greatly influence the level of reliability of electric power system. Localize interference by means of network down one by one causing a long recovery time. As a result, SAIDI relatively high value. Protection Relays 551 SEL has a feature that can save the nominal fault current value last received. The value stored in the relay memory. Value of fault current can be processed into the distance nuisance. Thus, the fault current value can help officers to track the fault location based on distance. SCADA as a system that monitors and controls the electrical power system equipment remotely in real time on duty to display the current value of disturbance located at 551 SEL protection relays to be sent to the Control Center or the Master Station. Keywords : SCADA, fault current, relay protection 551 SEL
SIMULASI SISTEM PERINGATAN DINI KETINGGIAN AIR SUNGAI DENGAN MENGGUNAKAN ALARM DAN SMS GATEWAY BERBASIS AT-MEGA 16 Firdaus, Muhammad; yuniarto, yuniarto
Gema Teknologi Vol 19, No 3 (2017): April 2017 - October 2017
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (824.655 KB) | DOI: 10.14710/gt.v19i3.21879

Abstract

Muhammad Firdaus, Yuniarto, in this paper explain that river is one of the important and supporting places for human life, some uses of the river include supporting industrial activities, tourism and much more, besides that many in some river function sites are used as dams for use as an area of electricity generation or just for control water content, but from rivers also natural disasters can occur, which is like a flood caused by overflowing river water The alert system will flood from overflowing rivers until now it cannot work automatically to determine the river's water level. This causes the average local population not to know when the river surface will overflow. In this study a flood detection system was designed that works automatically by knowing the level (level) of the river's water level In designing this tool, the system will be made on the basis of the Atmega 16 microcontroller, where as an input electrodes will be used as detection of water level, and the output will be an alarm with a certain type of sound that adjusts the water level. destination number in the form of notification of the condition of the river water level to be detected.
RANCANG BANGUN ANTENNA WAJANBOLIC DENGAN DIAMETER 46 CENTIMETER PADA FREKUENSI 1900 MHZ UNTUK MEMPERKUAT PENERIMAAN SINYAL WCDMA Nafik, Ichsyan; Yuniarto, Yuniarto
Gema Teknologi Vol 17, No 1 (2012): April 2012 - October 2012
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (697.114 KB) | DOI: 10.14710/gt.v17i1.8815

Abstract

Ichsyan Nafik, Yuniarto, in paper a 1900 MHz, 46 cm wajanbolic antenna design to strengthen wcdma signal reception explain that the antenna is a device used to transmit or receive electromagnetic waves electromagnetic waves. Reception using an antenna will amplify the signal acquisition in accordance with the ability of the antenna itself. Signal instability that often occurs in WCDMA networks makes the need for strengthening the acquisition of the signal is very large. Antenna Wajanbolic is one option reinforcement signal acquisition. In WCDMA networks, downlink frequency used at 2100 MHz, while the uplink frequency to 1900MHz. Antenna wajanbolic Must ditune to resonate in the uplink frequency is 1900 MHz. The final project focuses on making wajanbolic antenna for Line of Sight (LoS) who works at a frequency of 1900 MHz for WCDMA (3G). In accordance with the name wajanbolic antenna, this antenna uses a reflector from the pan, with a waveguide of modified pipes are coated with aluminum duct tape, and a signal receiver using a USB 3G modem. From the results of the testing and analysis of the results showed that wajanbolic antenna is directional antenna that has the directivity signal. This wajanbolic got an antenna gain of 16 dB value. Keyword: wajanbolic antenna, WCDMA, Line of Sight (LOS)
LIMBAH CAIR PANAS BUMI DAN DAMPAKNYA TERHADAP LINGKUNGAN Yuniarto, Yuniarto; Budhi Soesilo, Tri Edi; Hamzah, Udi Syahnoedi
Jurnal Matematika Sains dan Teknologi Vol 17 No 2 (2016)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Geothermal Power Plant Gothermal power plant is one of the green energy which produces low waste, including wastewater. The wastewater come from geothermal fluids that is not reinjected into the reservoir. its contains Arsenic (As), a dangerous chemical. Ulumbu geothermal Power Plant wastewater is discharged to the river nearby, Waekokor river. Arsenic (As) concentration in The wastewater has not been measures. The purpose of this research is to identify Arsenic (As) concentration in the geothermal wastewater. The result of this research shows that geothermal wastewater Arsenic (As) concentration is still below the regulation, that is 0,0365 mg/l. Geothermal wastewater discharge has no effect to the Arsenic (As) concentration in the river. Pembangkit Listrik Tenaga Panas Bumi Panas Bumi (PLTP) merupakan salah satu sumber energi yang ramah lingkungan karena menghasilkan limbah yang rendah, salah satunya adalah limbah cair. Limbah cair ini berasal dari fluida panas bumi. Fluida panas bumi yang tidak diinjeksikan kembali akan menjadi limbah cair. Salah satu zat kimia yang terkandung dalam limbah cair adalah Arsen (As). Pada lapangan panas bumi Ulumbu, limbah cair yang dihasilkan dari pembangkit listrik tenaga panas bumi dibuang kesungai Waekokor. Konsentrasi Arsen (As) pada limbah cair tersebut sampai dengan saat ini belum pernah diukur dan diteliti. Penelitian ini bertujuan untuk mengetahui besarnya konsentrasi Arsen (As)pada limbah cair yang dibuang ke Sungai Waekokor dan dampaknya terhadap lingkungan. Hasil dari penelitian ini menunjukkan bahwa konsentrasi Arsen (As) pada limbah cair PLTP Ulumbu yang dibuang ke sungai Waekoor masih dibawah baku mutu yang ditetapkan oleh pemerintah. Hasil dari penelitian ini menunjukkan juga bahwa pembuangan limbah cair ini tidak memberikan dampak terhadap lingkungan.  
SETTING RELAY DIFFERENSIAL PADA GARDU INDUK KALIWUNGU GUNA MENGHINDARI KEGAGALAN PROTEKSI Yuniarto, Yuniarto; Subari, Arkhan; Kusumastuti, Dinda Hapsari
Transmisi Vol 17, No 3 Juli (2015): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.067 KB) | DOI: 10.12777/transmisi.17.3.147-152

Abstract

Abstrak Proteksi adalah suatu bentuk perlindungan terhadap peralatan listrik yang ada guna menghindari kerusakan peralatan dan juga agar stabilias penyaluran tenaga listrik tetap terjaga. Bagian dari sitem proteksi adalah trafo arus atau trafo tegangan , pengawatan, dan sumber AC/DC. Trafo arus terbagi menjadi dua fungsi yaitu sebagai pengukuran dan proteksi. Salah satu relay yang digunakan yaitu relay differential yang merupakan pengaman utama transformator yang bekerja tanpa koordinasi dengan relay yang lain. Relay differential sendiri mempunyai beberapa syarat yang harus dipenuhi sebagai pengaman, diantaranya:CT yang digunakan harus mempunyai ratio perbandingan yang sama sehingga Ip = Is serta sambungan dan polaritas CT1 dan CT2 sama. Yang kedua pemasangan Auxiliary CT yang terhubung Y karena harus membandingkan arus pada dua sisi tanpa perbedaan fasa. Yang terakhir adalah karakteristik kejenuhan CT1 dan CT2 harus sama. Untuk itu perlu dilakukan setting relay differential dengan perhitungan pemilihan ratio CT, perhitungan ACT, setting relay differential itu sendiri dan error mismatch. Error mismatch pada trafo arus masih dibawah batas maksimal yaitu 5% karena didapat hasil perhitungan masing-masing trafo arus baik pada sisi 150 kV dan 20 kV sebesar 1,129% dan 0,721%. Kata kunci: CT, setting, relay differential  Abstract Protection is a form of protection against existing electrical equipment to avoid damage to the equipment and also that stabilias electrical power supply is maintained. Part of the system of protection is current transformer or voltage transformer, wiring, and the source of AC / DC. Current transformer is divided into two functions, namely a measurement and protection. One relay used is a differential relay which is a major safety transformer that works without coordination with the other relay. Differential Relay itself has several requirements that must be met as a safety, including: CT used must have the same ratio so that the ratio Ip = Is as well as connection and CT1 and CT2 same polarity. The second installation connected Auxiliary CT Y having to compare the current on the two sides without a phase difference. The latter is characteristic of CT1 and CT2 saturation should be the same. It is necessary for setting differential relay with a CT ratio electoral calculation, calculation ACT, setting differential relay itself and mismatch error. Error mismatch in the current transformer is still below the maximum limit of 5% as the result of each calculation of the current transformer on either the 150 kV and 20 kV amounting to 1.129% and 0.721%. Keywords : CT , setting , differential relays   Abstrak Proteksi adalah suatu bentuk perlindungan terhadap peralatan listrik yang ada guna menghindari kerusakan peralatan dan juga agar stabilias penyaluran tenaga listrik tetap terjaga. Bagian dari sitem proteksi adalah trafo arus atau trafo tegangan , pengawatan, dan sumber AC/DC. Trafo arus terbagi menjadi dua fungsi yaitu sebagai pengukuran dan proteksi. Salah satu relay yang digunakan yaitu relay differential yang merupakan pengaman utama transformator yang bekerja tanpa koordinasi dengan relay yang lain. Relay differential sendiri mempunyai beberapa syarat yang harus dipenuhi sebagai pengaman, diantaranya:CT yang digunakan harus mempunyai ratio perbandingan yang sama sehingga Ip = Is serta sambungan dan polaritas CT1 dan CT2 sama. Yang kedua pemasangan Auxiliary CT yang terhubung Y karena harus membandingkan arus pada dua sisi tanpa perbedaan fasa. Yang terakhir adalah karakteristik kejenuhan CT1 dan CT2 harus sama. Untuk itu perlu dilakukan setting relay differential dengan perhitungan pemilihan ratio CT, perhitungan ACT, setting relay differential itu sendiri dan error mismatch. Error mismatch pada trafo arus masih dibawah batas maksimal yaitu 5% karena didapat hasil perhitungan masing-masing trafo arus baik pada sisi 150 kV dan 20 kV sebesar 1,129% dan 0,721%. Kata kunci: CT, setting, relay differential Abstract Protection is a form of protection against existing electrical equipment to avoid damage to the equipment and also that stabilias electrical power supply is maintained. Part of the system of protection is current transformer or voltage transformer, wiring, and the source of AC / DC. Current transformer is divided into two functions, namely a measurement and protection. One relay used is a differential relay which is a major safety transformer that works without coordination with the other relay. Differential Relay itself has several requirements that must be met as a safety, including: CT used must have the same ratio so that the ratio Ip = Is as well as connection and CT1 and CT2 same polarity. The second installation connected Auxiliary CT Y having to compare the current on the two sides without a phase difference. The latter is characteristic of CT1 and CT2 saturation should be the same. It is necessary for setting differential relay with a CT ratio electoral calculation, calculation ACT, setting differential relay itself and mismatch error. Error mismatch in the current transformer is still below the maximum limit of 5% as the result of each calculation of the current transformer on either the 150 kV and 20 kV amounting to 1.129% and 0.721%. Keywords : CT , setting , differential relays