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GEMA TEKNOLOGI

gema_teknologi
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Published by Universitas Diponegoro

ISSN : 08520232 EISSN : 2656582X DOI : -

Core Subject : Science,

Computer Science & IT

Gema Teknologi Journal (pISSN : 0852-0232, eISSN : 2656-582X) is an open access journal published by Vocational School, Diponegoro University, Indonesia. Gema Teknologi publishes articles from various engineering disciplines (the results of original scientific research or new scientific studies of literature). Editor receives articles both in English and Indonesian. Gema Teknologi Journal is published 2 (two) times a year, on April and October.

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Articles 166 Documents

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SIMULASI DAN MONITORING KOORDINASI RECLOSER DAN SSO PADA JARINGAN DISTRIBUSI 20 KV PT. PLN (PERSERO) AREA SEMARANG PENYULANG KALISARI 07 BERBASIS ARDUINO MEGA 2560 DAN VT SCADA 11.2 Zuraida, Hanif; Winarno, Heru
Gema Teknologi Vol 20, No 3 (2019): April 2019 - October 2019
Publisher : Vocational School Diponegoro University

Â Hanif Zuraida, Heru Winarno, in this article describes the simulation of protection equipment coordination systems, especially in the recloser and sectionalizer areas. Coordination between protective equipment to improve the network reliability system so that in the event of a disturbance, the area affected by the disturbance does not spread widely. The simulation tool is made using OMRON LY2N 12V relay, ULN2803 relay driver circuit, ZMCT103C current sensor, voltage divider voltage sensor, pull down, 12V 6W lamp as a load and several resistors with different resistivity values as interference. Arduino Mega 2560 is used as the central controller for the entire circuit. After the experiment, the results obtained are when the normal network current at the recloser is 0.86 A and the current at the LBS SSO1 is 0.43. The recloser and LBS SSO1 coordination lies in zone 2 and 3 disturbances. When simulated zone 2 interference, the recloser current rises to 1.28 A, causing reclose / trip to lock out recloser. When the recloser feels a fault current in zone 3 of 1.06 A and LBS SSO1 senses a current of 0.64 A. The recloser as protective equipment will open first within 1000 ms after sensing the disturbance. When the recloser opens, the voltage on the SSO will be 0 volts and the SSO will open within 1000 ms after the current and disturbance requirements are met. Then the recloser will close again after 2000 ms from the open condition.

OPTIMALISASI HMI SCADA UNTUK MONITORING DAN KONTROL REPEATER RADIO KOMUNIKASI MENGGUNAKAN MODEM GPRS INTEK J65i-X Aufa, Al Anamila Nur; Yuwono, Teguh
Gema Teknologi Vol 18, No 1 (2014): April 2014 - October 2014
Publisher : Vocational School Diponegoro University

Al Anamila Nur Aufa, Teguh Yuwono, in paper SCADA HMI optimization for monitoring and control repeater using radio communication modem GPRS INTEK J65iâ€“X explain that radio communications at PT PLN ( Persero ) APD Central Java and Yogyakarta is still a major communication medium for coordinating the work , both maintenance and handling of interference between units . Repeaters in this case an important role in the communication process between APD dispatcher JTY with Area - Area and officers in the field because of the presence of the communication range of the repeater spacing becomes wider . In operation repeaters can be susceptible to interference that can result in radio communications in the areas covered by the repeater to be disrupted so that the communication between the dispatcher APD JTY with Area - Area and field workers to be blocked. Handling repeater for this disorder is not maximized due to the lack of real time monitoring of the state of the repeater , so that when the repeater impaired in the device or on the supply , the clerk did not know in person and just waiting for a report from the repeater keeper at any time at the shelter is not a repeater . There needs to be a device that can monitor the state of the repeater , which if detected interference at the source , supply and radio , PPE JTY officer may direct monitoring , so that it can assist in the handling and analysis of causes of hearing disorders without having to come to the site . GPRS Modem Utilization Intek J65i - X allows retrieval status of the repeater equipment where it can not be done at this time . With facilities tapped digital inputs and digital outputs on the modem , any condition of equipments such as radio signal repeater RX , TX radio signal , battery , charger and 220V supply state of the supply voltage can be detected . From changes in the supply voltage available , can be detected by a GPRS modem Intek J65i - X so that when there is an interruption in the HMI SCADA can termonitoring in real time . With the monitoring and control of a radio repeater communications , personnel no longer need to go to the location (site ) only to find the cause of the disturbance . Interference analysis can also be performed before treatment is held further disruption . Reset control radio can also be done quickly if the radio have to hang in its operation , so that the future will be able to improve the performance of SCADA systems PT PLN ( Persero ) APD Central Java and DI Yogyakarta. Keywords : repeater , modem GPRS Intek J65i - X , auxiliary relays , monitoring and control , HMI SCADA

HIDROLISA KOLAGEN DALAM CEKER AYAM HASIL PERENDAMAN DENGAN ASAM ASETAT PADA PROSES PEMBUATAN GELATIN Santosa, Herry; Abyor H, Noer; Guyana, Nurmy Lailati; Dwi Handono, Sigit Firman
Gema Teknologi Vol 20, No 1 (2018): April 2018 - October 2018
Publisher : Vocational School Diponegoro University

Herry Santosa, Noer Abyor H, Nurmy Lailati Guyana, Sigit Firman Dwi Handono, Gelatin is a chemical compound with molecular formula (C102H151N31O39)n in the form of a heterogeneous mixture of polypeptide obtained by collagen partial hydrolysis of animal binding tissue by acid or base treatment. Sources of gelatin production generally derived from cow bones, pig skins, fish scales or chicken bones. Gelatin is widely used in food and pharmaceutical industries because of its ability to form a thermoreversible gel, among others as a stabilizer on ice cream, capsule making materials and matrix for implants. The main objective of this research is to make gelatin with chicken claw based ingredients through the process of collagen hydrolysis. Specifically aims to determine the effects of acetic acid concentration on the collagen levels, determining the most influential variable between temperature and time on the hydrolysis process, as well as the assessment and determination of the optimum temperature or time in the hydrolysis process so as to approximate the criteria corresponding to the commercial gelatin characteristics, i.e gel strength (50-300 Bloom), viscosity (1.5-7,5 cP), and gelatin sensory properties. To answer that goal, the research is planned through 2 stages, namely the preparation stage, product creation, and gelatin flour characterization. The preparatory stage consists of cleansing, reduction of chicken claw and demineralization. The production stage consists of determining the most influential variables and the optimum variable variations (temperature and time) of the collagen hydrolysis process into gelatin flour based on the functional properties and gelatin sensory properties. The results of this research showed that the optimum concentration of acetic acid in demineralization was at a concentration of 1.5 N, the most influential variable was the temperature variable with a single effect average value - 5.05, the relatively good variable collagen hydrolysis was at 600 C and 4 hour.

PENGELOLAAN KUALITAS UDARA DI PERKOTAAN Suyanto, Hadi
Gema Teknologi Vol 16, No 2 (2011): October 2010 - April 2011
Publisher : Vocational School Diponegoro University

Hadi Suyanto, in this paper explain that to avoid global warming and climate change effect, re-greening program at the open and dry area need to be established, this also to generate fresh temperature and improve health and comfort. Develop and enlarge green zone and public zone asÂ partÂ of air quality management that have social and environmental function, and not just as an esthetically function.Â Keyword: Air Quality, re-greening

APLIKASI TAPIS PELEWAT RENDAH LC (LOW PASS LC FILTER) UNTUK MEREDUKSI DISTORSI HARMONISA PADA LAMPU HEMAT ENERGI Sasmoko, Priyo; Subali, Subali; Yuwono, Teguh
Gema Teknologi Vol 16, No 4 (2012): October 2011 - April 2012
Publisher : Vocational School Diponegoro University

Priyo Sasmoko, Subali, Teguh Yuwono, in this paper explain that harmonic (current or voltage) is one of the problems that has to be solved in electric power system, especially that caused by non-linear loads. Harmonic could cause bad impacts for the electric components that sensed it. It is almost certain that using of fluorescent lamp with electronic ballast or it is called energy saving lamp can cause harmonic in electric power system. Considering of the using of energy saving lamp is increased fairly fast as residence and office lighting, so it is important to analyze and solve the harmonic that caused by energy saving lamp. From the harmonic analysis, we can know the harmonic distortion caused by energy saving lamp. And there are some efforts to reduce such harmonic distortion by using a Low Pass Filter. Keyword: power quality, harmonic, low pass filter.

ANALISIS NILAI INDEKS KEANDALAN SISTEM JARINGAN DISTRIBUSI UDARA 20 KV PADA PENYULANG PANDEAN LAMPER 1,5,8,9,10 DI GI PANDEAN LAMPER Arifani, Nur Indah; Winarno, Heru
Gema Teknologi Vol 17, No 3 (2013): April 2013 -October 2013
Publisher : Vocational School Diponegoro University

Nur Indah Arifani, Heru Winarno, in this paper explain that interruption of electricity supply for customers is very disturbing activity. Interruption/outage that occurred in the distribution network led to the disruption of continuity of service. Lots and duration of outages at the feeder Pandean Lamper 1,5,8,9, and 10 at Substation Pandean Lamper observed by the authors to get a reliability index value. This observation aims to get the value of SAIFI and SAIDI in substation feeder PDL Pandean Lamper at 1, 5, 8, 9, 10 and compared with a standard value of PLN as a world-class company (WCC) is SAIFI = 3 time/customer/year, SAIDI = 1.66 hours/customer/year. Disorders due to components and equipment as well as the tree is the most dominant cause of the outage. To obtain this index takes a data rate of failure (Î»), a long interruption (U) and the number of customers (N) as well as get other customer-oriented index values â€‹â€‹are CAIFI, CAIDI, ASAI, ASUI. The analysis showed that the reliability index value for the feeder SAIFI value of PDL 1, 5, 8, 9, 10 all have a lower index value of PLN standards. For the fifth feeder SAIDI value only feeder PDL 9 impaired outages longer than four other feeder with an index value of 1.78 hours/customer/year beyond the PLN standard. For those who do not fit the standard feeder PLN performed maintenance measures components, as well as the supervision of the disturbance and other animals. Keywords: distribution network, continuity, blackouts, interruption, SAIFI, SAIDI, CAIFI, CAIDI.

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

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.

RANCANG BANGUN MINIATUR TEMPAT PARKIR DENGAN METODE ELEKTRONIK PARKING PRICING (EPP) BERBASIS ARDUINO UNO Raflianto, Gasa; Sasmoko, Priyo
Gema Teknologi Vol 18, No 3 (2015): April 2015 - October 2015
Publisher : Vocational School Diponegoro University

Gasa Raflianto, Priyo Sasmoko, in this paper explain that design of miniature electronic methods parking place with parking pricing (EPP) based arduino uno created by looking at the problems that occur at this time, Berparkir is something that is often encountered in everyday dikehidupan. sometimes it is crucial to find the solution in order to provide convenience and comfort for the driver of the vehicle as well as the efficient use of parking space limitations. A lot of wasted time and sometimes quite a hassle just to queue entrance and exit of the parking lot during rush hour. Based on these problems, the authors provide a solution by designing a tool that can enable people to berparkir without having taken the trouble to enter and exit the parking lot without having to waste time and tenaga.Sistem is also supported by the Arduino Uno as the brain to process data from RFID, infrared is used to instruct the servo and servo motor is used as a parking portal.Â Keywords:, Servo, RFID, Infrared Sensor.ReferencesAnonim. Sensor. 5 agustus 2015. https://id.wikipedia.org/wiki/SensorIsyanto, Jazi Eko. 2014. Pengantar Elektronika dan Instrumentasi Pendekatan Project Arduino dan Android. Yogyakarta: ANDI.Koestoer, Raldi Artono.2004. Pengukuran Teknik. Jakarta: Departemen Teknik Mesin Fakultas Teknik Universitas Indonesia.Massimo dkk., Arduino/Genuino Uno, 29 juli 2015.Purnama , Agus, Kapasitor, Â 28 juli 2015Purnama , Agus, motor servo,Â 28 juli 2015Varlag,Zum, RFID, 28 juli 2015Van Vlack. Lawrench, Ilmu dan Teknologi Bahan, Erlangga, hal 186Zona elektro, Pulsa kendali motor servo, Â 28 juli 2015Zona elektro, Komponen led Inframerah, 27 juli 2015.

AUDIT ENERGI PADA SEBUAH HOTEL Ariwibowo, Didik
Gema Teknologi Vol 16, No 3 (2011): April 2011 - October 2011
Publisher : Vocational School Diponegoro University

Didik Ariwibowo, in this paper explain that energy audit activities conducted through several phases, namely: the initial audit, detailed audit, analysis of energy savings opportunities, and the proposed energy savings. Total energy consumed consists of electrical energy, fuel, and materials in this case is water. Electrical energy consumption data obtained from payment of electricity accounts for a year while consumption of fuel and water obtained from the payment of material procurement. From the calculation data, IKE hotels accounted for 420.867 kWh/m2.tahun, while the IKE standards for the hotel is 300 kWh/m2.tahun. Thus, IKE hotel included categorized wasteful in energy usage. The largest energy consumption on electric energy consumption. Largest electric energy consumption is on the air conditioning (AC-air conditioning) that is equal to 71.3%, and lighting and electrical equipment at 27.28%, and hot water supply system by 4.44%. Electrical energy consumption in AC looks very big. Ministry of Energy and Mineral Resources of the statutes, the profile of energy use by air conditioning at the hotel by 48.5%. With these considerations in the AC target for audit detail as the next phase of activity. The results of a detailed audit analysis to find an air conditioning system energy savings opportunities in pumping systems. Recommendations on these savings is the integration of automation on the pumping system and fan coil units (FCU). The principle of energy conservation in the pumping system is by installing variable speed drives (VSD) pump drive motor to adjust speed according to load on the FCU. Load variations FCU provide input on the VSD pumps to match. Adaptation is predicted pump can save electricity consumption up to 65.7%. Keywords: energy audit, IKE, AC

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

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.Â 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.Â There are a lot of programming language that can be used for create this software, one of that is Java programming language.Â 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 MinimarketÂ information system. Keywords: Minimarket Information System, iReport, Java, Mysql, Netbeans.

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