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Suharyanto
Universitas Gadjah Mada
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Pengaruh Kadar Air terhadap Karakteristik Tegangan Tembus dan Dielektrik Isolasi Kertas-Minyak Andhang Windarto; Suharyanto; T. Haryono
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 4 No 2: Mei 2015
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Paper impregnated oil (paper-oil insulation) is used as insulation material in transformer. The water in transformer appears as a consequence of oxidation process of the paper-oil system and atmospheric air penetration into the tank. High voltage testing is used to test paper-oil insulation with different water content to examine its breakdown voltage. Three conditions were used in this research, which are initial condition, the condition after heating up to 700C, and the condition after cooling down at room temperature for 2 x 24 hour. The result of high voltage tests shows that the water content can decrease the breakdown voltage and the dielectric strength of paper-oil insulation. The heating-cooling process reduces the water content of oil insulation and therefore increases the breakdown voltage and dielectric strength of paper-oil insulation.
Efek Kegagalan Alat Flue Gas Desulphur Terhadap Tegangan Lewat Denyar Isolator Tedy Juliandhy; T. Haryono; Suharyanto
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 3 No 2: Mei 2014
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Flashover is a disorder condition that occurs in the form of sparks appearing between insulators or electrical component of high voltage. This can occur due to insulation failure of the high voltage system. Failure of insulation in high voltage insulators in Tanjung Jati B substation Jepara is one of the causes of acid rain due to the condensation of smoke from the Tanjung Jati B power plant chimney. Acid rain arises due to failure Flue Gas Desulphur ( FGD ) devices were installed in the plant to reduce gas emissions as a condition of eco-friendly power plant that is planned by the government through the department of Environment . The real action is taken to dismiss the notion that power plant fuel coal is one of the industries that emit SOx and NOx emissions are high on operational processes . The effects of gas emissions is one of the causes of acid rain on the environment . The amount of acidity of acid rain that occurred in the industrial area will always affect the high voltage power lines that distribute power in operation . Sometimes the equipment functions as an insulator in high voltage substations that distribute power at 500 kV network SUTET JAMALI network on the island of Java in a system of operation is interrupted because of pollutants attached to the insulator . Rain with a pH between 4-5 categorized as acid rain and the test affects the time of the flashover voltage drop of 145.5 kV – 142.5 kV of the working voltage , this causes an insulator as insulation materials can be minimized distance insulator surface so that termites can affect the resistance of an insulator in its function as a tool to restrain the occurrence of flashover voltage from voltage parts.
Pengaruh Radiasi UV Buatan Terhadap Kerusakan Permukaan Bahan Isolasi Resin Epoksi Silane Yanolanda Suzantry H; Suharyanto
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 4: November 2013
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Polymer is now developed as the material replacement of the porcelain isolator and glass insulators. However, tropical climates and high rainfall can cause problems to its. Ultraviolet radiation will continuously accelerate to the surface of the polymer insulator material. As a result, the surface of the insulating material becomes easier letting electric current flow and a fast formation of extensive damage to the surface of the insulator material. Materials used in this study were made from epoxy resin diglycidyl ether of bisphenol-A (DGEBA) as the base material, metaphenylen diamine (MPDA) as the reinforcement material and silica sand. DGEBA and MPDA composition was 30% silica sand filler 30%, 25%, 20%, 15%, 10% and 10% silicone rubber was 15%, 20%, 25%, 30%. The size of the test material was 120 mm x 50 mm x 5 mm. The study was conducted in the laboratory according to standard IEC 587: 1984. This study was conducted to determine the effect of ultraviolet radiation on hydrophobic contact angle and surface damage on the broad value of insulation material epoxy resin silanes. The results showed that the length of exposure time to UV light tended to increase the value of the contact angle. This was due to exposure to artificial UV rays which would accelerate the degradation process. The longer the level of ultraviolet radiation on the sample accelerating the degradation off silane epoxy resin insulators in addition, it caused greater leakage current on extensive damage to the surface of the insulating material.
Evaluasi Kinerja IMAG pada Pembangkit Listrik Tenaga Mikrohidro Cokro Tulung Kabupaten Klaten Mahalla; Suharyanto; M. Isnaeni B. S.
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 1: Februari 2013
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

IMAG (Induction Motor as Asynchronous Generator) or induction motor that is used as an asynchronous generator having been widely used in micro-hydro Power Plant (MHP)usually in small capacity, i.e below 100 Kw. The reason for the widespread popularity of induction generator is owing to it’s capability to generate the power from variable speed as well as constant speed prime movers, low unit cost, reduced maintenance, rugged and brushless rotors, absence of a separate d.c. source for excitation, absence of moving contacts, inherent overload protection, improved performance due to low transient impedance, natural protection against short circuit, there are many on the market etc. Their main disadvantage is poor voltage and frequency regulation under varying load and speed. Imag performance evaluation needs to be analyzed including it is voltage stability analysis and frequency analysis in expenses. Based on the analysis of the system in general, efficiency is 47,38% total imag and positions the turbine room and Imag are still far from flood-free area, so a high fall (head) can be increased from 1 m up to 2.21 m, this can increase the potential and generated power of 82.56% Based on the analysis of the daily load, major load changes affect changes in voltage and frequency output of the imag, this was due to the load current controller can not work fast (slow response) to divert the major load changes to the load apparent (ballast load). There are several methods that can be done to control the voltage and frequency, one method of which is to adjust the load (dummy load). The results of the analysis will be in the form of recommendations for improvement so that the MHP and the frequency of the voltage instability can be obtained to ensure the quality of the electricity generated by Imag at MHP system.
Implementasi Komunikasi Data Berbasis ZigBee pada SCADA (Supervisory Control and Data Acquisition) PLTMh Beny Firman; Suharyanto; Eka Firmansyah
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 1: Februari 2013
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Recently, Microhydro Power Center (Pusat Listrik Tenaga Mikrohidro or PLTMh) has been spread widely the energy electric generator. PLTMh control system in Indonesia often uses automatic control system. One of the reasons for this is that the operation and monitoring of the PLTMh could be done from a distance. One of PLTMh models of remote control is known as SCADA. One of the main parts of SCADA is Master Station (MS), Remote Terminal Unit (RTU) & Communication System. Communication System in SCADA can be built in several choices: wired or wireless. Remote control can be built using Wireless Sensor Network (WSN) system. The application of WSN in operating SCADA could ease installation and increase communication reliability. This study applied ZigBee technology on PLTMh SCADA control data communication. ZigBee was chosen because it’s free of operation and licensing charge, had OSI feature and low cost, those are reasons why they are best suited to PLTMh application. In the application, ZigBee hardware was divided into several parts: Coordinator on Master Station(MS) (one unit), End Devices which were each RTU unit point (two units) and Router as a data hooping between Coordinator & End Device (one unit). The furthest point between Coordinator and End Device through Router could reach 645 meters. This was tested in LOS (Line of Sight) condition. RSSI signal on ZigBee was used to see the strength of signal reception on Coordinator as data collector. RSSI score (-dBm) became smaller at maximum distance variation. This meant signal power at data jump point became lower. ZigBee based data communication to form SCADA network had been built well in join a network model, which was between Coordinator — Router — End Device at the furthest distance, 645 meters, with signal power of -82dBm.
Co-Authors Andhang Windarto Beny Firman Eka Firmansyah Mahalla Mokhammad Isnaeni Bambang Setyonegoro T. Haryono Tedy Juliandhy Yanolanda Suzantry H