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All Journal TRANSIENT: Jurnal Ilmiah Teknik Elektro Jurnal Sistem Komputer TELKOMNIKA (Telecommunication Computing Electronics and Control) Proceeding of the Electrical Engineering Computer Science and Informatics Automotive Experiences Jurnal Rekayasa elektrika

Hermawan, Hermawan

Department Of Electrical Engineering, Diponegoro University, Semarang

Author-ID : 2454283

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

Published : 19 Documents Claim Missing Document

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Rancang Bangun Sub-sistem Informasi untuk Pencatatan Transaksi di Program Studi Sistem Komputer Undip Hermawan, Hermawan; Iman Satoto, Kodrat
Jurnal Sistem Komputer Vol 1, No 1 (2011)
Publisher : Jurnal Sistem Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jsk.v1i1.3

Currently in Computer Systems Engineering, Faculty of Engineering, Diponegoro University, Semarang, all records of financial transactions are still using Microsoft Excel and Microsoft Word. It can be assumed that to make a statement of financial performance is very difficult, both statements of cash receipts and cash disbursements report. It should be made a software for reporting financial performance can be monitored by the Head of Department and staff are entitled, at a moment's financial performance reports can be monitored and printed quickly, easily and accurately.This research is conducted by methods such as by literature study, system design and testing of the system. In the literature study used methods of research library of reference books related. The design of this study using a Rapid Application Development (RAD) so easy to develop applications. Applications are also made so easily accessible web-based and maintained (maintenance), because the application is placed on the server side. To secure information from unauthorized users, multi-user application created with the login system.The expected result is a sub-information systems for recording transactions and reporting financial performance can easily monitor and printed at any time needed.

ANALISA PENGARUH PENAMBAHAN SILANE TERHADAP UNJUK KERJA ISOLATOR BAHAN RESIN EPOKSI DENGAN KONTAMINAN PANTAI SYAKUR, abdul; Hermawan, Hermawan; Susilawati, Dyah Ika
Jurnal Sistem Komputer Vol 2, No 1 (2012)
Publisher : Jurnal Sistem Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jsk.v2i1.23

Salah satu bahan polimer yang dikembangkan sebagai isolator adalah Resin Epoksi. Bahan polimer ini memiliki kelebihan dibandingkan dengan isolator bahan isolasi keramik dan gelas. Isolator yang digunakan pada saluran transmisi dan jaringan distribusi seringkali melalui daerah pantai yang memiliki pengaruh terhadap kinerja isolator. Adanya kontaminan di udara dapat menempel pada permukaan material isolasi pasangan luar sehingga menyebabkan arus bocor mengalir pada permukaan isolator tersebut. Arus bocor ini merupakan peristiwa awal yang dapat mengakibatkan degradasi permukaan isolator yang lama-kelamaan menyebabkan terjadinya kegagalan isolator. Makalah ini mempresentasikan hasil pengukuran arus bocor skala laboratorium pada bahan material resin epoksi silane dengan menggunakan metode pengukuran Inclined-Plane Tracking (IPT). Pengukuran ini dilakukan untuk mengetahui pengaruh variasi komposisi silan terhadap sudut kontak hidrofobik dan arus bocor. Pengolahan data yang dilakukan meliputi pengukuran sudut kontak, waktu terjadinya arus bocor, arus bocor rata-rata, dan waktu penjejakan. Berdasarkan hasil pengukuran dan analisis data menunjukkan bahwa komposisi silan mempengaruhi sudut kontak, waktu terjadinya arus bocor, besar arus bocor rata-rata, dan waktu penjejakan. Dilihat dari keseluruhan faktor yang diukur, maka didapatkan komposisi bahan yang optimal yaitu resin epoksi dengan persentase silane 30%.Permalink:Â http://jsiskom.undip.ac.id/index.php/jsk/article/view/23

ANALISIS SIFAT HIDROFOBIK PERMUKAAN HDPE BERDASARKAN NILAI TOTAL HARMONIC DISTORTION Abdul Syakur; Hermawan Hermawan; Sarjiya Sarjiya; Hamzah Berahim
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 7, No 2: August 2009
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v7i2.583

Polymer material has been developed to replace the porcelain insulator material and glass. When it is used as outdoor insulator, environmental conditions have a significant influence to the value of surface discharge current, especially for the coastal area and industry. Salt, dust and chemicals contaminant are suspected as the causes of initial current of surface discharge and the insulator surface degradation which lead to a flashover. To analyze the performance of the insulator surface when the leakage current occurs, the Total Harmonic Distortion (THD) is needed to be determined. The value of THD leakage current indicates the hydrophobic characteristic of surface material. This paper analyzes the results of leakage current measurement in laboratory-scale based on IEC 587:1986 with Inclined-Plane Tracking (IPT) method to the High Density Polyethylene (HDPE) polymer material which is provided in smooth and rough surface. The testing voltage is 50 Hz AC. Data of leakage current magnitude values cover its maximum average as a function of time and the result of FFT to the wave form of the leakage current. As the result, the value of percentage THD decrease as the function of time. The smooth surface material has THD value 43.42% and the rough surface has 15.89%.

The Electrical Performance of Epoxy Resin Insulator under Rain Contaminants Abdul Syakur; Hermawan .
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

A polymeric insulating material as outdoor insulatorhas been developed and used on transmission lines and powerdistribution network. Each material has its own advantages anddisadvantages. Generally, polymeric materials have dielectricproperties better than the ceramic, glass and porcelain material.Factors affecting performance of outdoor insulators are like rain,humidity, ultraviolet rays, condensation and contaminant. When rainwater flow at the insulator surface, they will be easily contaminatedand flow current. These events can cause damage to the surface of theinsulator and finally cause flashover. To improve the surfaceproperties of materials, silicon rubber material that has the ability torepel water were added. Silica sand was mixed with silicon rubber toimprove the mechanical properties.This paper presents the electrical performance of epoxyresin insulator under rain contaminants. The tests were conducted athigh voltage laboratory with AC high voltage 50 Hz. Leakage currentcharacteristic of 20 kV outdoor insulators with silane epoxy resin hasbeen investigated under dry and wet condition. The chamber wasused to placing the insulator.The research results showed that the leakage currents oninsulator surface were affected rain contaminant and magnitude ofapplied voltage. A minimum leakage current achieved at outdoorinsulator without contaminant. For outdoor Insulator under raincontaminant, leakage current tends to increase. Shape of insulatorinfluence the leakage current also was analyzed.

Simple Resonant Power Converter Supplied by Photovoltaic for Ozonizer Mochammad Facta; Hermawan .; Zainal Salam
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

Ozone gas (O3) is widely used in deodorization,decolourization, disinfection, bleaching processes, gas/airtreatment, chemical synthesis and recently in medicalapplications. Due the wide application of ozone then the ozonegenerator or ozonizer is urgently needed. A single switchresonant converter with ferrite transformer is proposed in thiswork. The prototype is constructed by two parts, first is ozonechamber and the second part is power converter with a singleswitch resonant converter and it supplied by photovoltaicsimulator. The converter is successful to convert 12 volt fromphotovoltaic to 1.89 kVpp high frequency voltage to ozonechamber. The ozone gas produce with the proposed system is 450ppm with oxygen as an input gas.

Experimental and Theoretical Prediction of Ozone Yield by High Frequency Silent Discharge Mochammad Facta; Hermawan Hermawan; Zainal Salam; Zolkafle Buntat
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 2: EECSI 2015
Publisher : IAES Indonesia Section

The paper uses dimensional analysis to develop atheoretical prediction of the yield of a high frequency silentdischarge ozone generator at atmospheric pressure. Theexperimental work was carried out in order to verify the viability ofthe resulting yield equation, a rectangular shaped chamber with a1.5 mm air gap was constructed. Aluminium mesh electrodes wereused with metal tape and a planar mica sheet forming a dielectricbarrier. The power supply to the chamber was from a modifiedclass E resonant power inverter. It is established that predictionsusing the yield equation match closely with data obtained from theexperimental findings

The Effects of Cells Temperature Increment and Variations of Irradiation for Monocrystalline Photovoltaic Faishal Fuad Rahman Soeharto; Hermawan Hermawan
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 3: EECSI 2016
Publisher : IAES Indonesia Section

Photovoltaic cell technology has been developed to meet the target of 17% Renewable Energy in 2025 accordance with Indonesia Government Regulation No. 5 2006. Photovoltaic cells are made of semiconductor materials, namely silicon or germanium (p-n junction). These cells need the light that comes from solar irradiation which brings energy photons to convert light energy into electrical energy. It is different from the solar heater that requires heat energy or thermal of sunlight that is normally used for drying or heating water. Photovoltaic cells requires energy photons to perform the energy conversion process, the photon energy can be derived from sunlight. Energy photon is taken from the sun light along with the advent of heat due to black-body radiation, which can lead to temperature increments of photovoltaic cells. Increment of 1°C can decreased photovoltaic cell voltage of up to 2.3 mV per cell. In this research, it will be discuss the analysis of the effect of rising temperatures and variations of irradiation on the type monocrystalline photovoltaic. Those variation are analyzed, simulated and experiment by using a module of experiment. The test results show that increment temperature from 25° C to 80° C at cell of photovoltaic decrease the output voltage of the photovoltaic cell at 4.21 V, and it also affect the power output of the cell which decreases up to 0.7523 Watt. In addition, the bigger the value of irradiation received by cell at amount of 1000 W / m2, produce more output power cells at the same temperature.

Determination of Hydrophobic Contact Angle of Epoxy Resin Compound Silicon Rubber and Silica Abdul SYAKUR; Hermawan Hermawan; Heri SUTANTO
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 3: EECSI 2016
Publisher : IAES Indonesia Section

Epoxy resin is a thermosetting polymeric material which is very good for application of high voltage outdoor insulator in electrical power system. This material has several advantages, i.e. high dielectric strength, light weight, high mechanical strength, easy to blend with additive, and easy maintenance if compared to that of porcelain and glass outdoor insulators which are commonly used. However, this material also has several disadvantages, i.e. hydrophilic property, very sensitive to aging and easily degraded when there is a flow of contaminants on its surface. The research towards improving the performance of epoxy resin insulation materials were carried out to obtain epoxy resin insulating material with high water repellent properties and high surface tracking to aging. In this work, insulating material was made at room temperature vulcanization, with material composition: Diglycidyl Ether Bisphenol A (DGEBA), Metaphenylene Diamine (MPDA) as hardener with stoichiometric value of unity, and nanosilica mixed with Silicon Rubber (SiR) with 10% (RTV21), 20% (RTV22), 30% (RTV23), 40% (RTV24) and 50% (RTV25) variation. The usage of nanosilica and Silicon Rubber (SIR) as filler was expected to provide hydrophobic properties and was able to increase the value of surface tracking of materials. The performance of the insulator observed were contact angle of hydrophobic surface materials. Tests carried out using Inclined Plane Tracking procedure according to IEC 60-587: 1984 with Ammonium Chloride (NH4Cl) as contaminants flowed using peristaltic pumps. The results show that hydrophobic contact angle can be determined from each sample, and RTV25 has maximum contact angle among others.

The Effects of Sodium Hydroxide (NaOH) Concentration and Reaction Temperature on The Properties of Biodiesel from Philippine Tung (Reutealis Trisperma) Seeds Slamet Supriyadi; Purwanto Purwanto; Didi Dwi Anggoro; Hermawan Hermawan
Automotive Experiences Vol 5 No 1 (2022)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Philippine Tung (Reutealis trisperma) is an indigenous nut that is a relatively new feedstock for producing biodiesel in Indonesia. The nature of NaOH base catalyst and reaction temperature plays an important role in the method of biodiesel production. This study aimed to assess the effects of different percentages of NaOH base catalyst and reaction temperature on physicochemical properties of Philippine Tung biodiesel. Transesterification process was carried out by reacting Philippine Tung oil with methanol and NaOH catalyst. NaOH weight to oil weight was at 0.25%, 0.5%,0.75% and 1%, the reaction temperature set up were at 60°C and 70°C, while methanol-oil molar ratio was set at 6:1. Yield, acid value, saponification value, density, and viscosity of biodiesel were significantly influenced by NaOH catalyst concentrations. Meanwhile reaction temperature had no effect on the yield and viscosity. Philippine Tung biodiesel produced using 0.25% NaOH catalyst met the SNI 04-7182-2015 biodiesel standard of the properties investigated in this study (yield: 96.18%, acid value: 0.466 mg KOH/g, saponification value: 200.083 mg KOH/g, density: 0.889 g/mL, viscosity: 5.276 cSt).

ANALISIS UNJUK KERJA ISOLATOR POLIMER 20 kV RESIN EPOKSI BAHAN PENGISI TiO2 (TITANIUM DIOXIDE) DENGAN SIRIP SERAGAM PADA KONDISI KONDUKTIVITAS YANG BERVARIASI Andhika Ilham Wahyu Nugroho; Abdul Syakur; Hermawan Hermawan
Transient: Jurnal Ilmiah Teknik Elektro TRANSIENT, VOL. 10, NO. 2, JUNI 2021
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/transient.v10i2.306-311

Meningkatnya pertumbuhan penduduk dan industri harus disertai dengan suplai energi listrik yang memadai dan sistem distribusi energi listrik yang handal. Salah satu komponen penting untuk menunjang kehandalan sistem adalah isolator. Isolator berfungsi untuk mengisolir suatu konduktor bertegangan dengan kerangka penyangga yang dikembumikan sehingga tidak ada arus listrik mengalir dari konduktor tersebut ke tanah. Berbagai jenis bahan untuk isolator telah dikembangkan. Salah satunya adalah isolator dengan bahan resin epoksi. Isolator dengan bahan resin epoksi memiliki kelebihan dibandingkan dengan isolator porselen dan gelas, salah satunya memiliki bobot yang lebih ringan dibandingkan bahan porselen dan gelas. Namun isolator jenis ini masih tergolong baru, sehingga untuk meningkatkan performa dari isolator ini, salah satu caranya adalah dengan menambahkan bahan pengisi. Pada penelitian ini, dipaparkan pengaruh variasi tegangan pada kondisi kering dan basah serta penambahan TiO2 (Titanium Dioksida). Hasil pengujian menunjukkan bahwa perubahan tegangan dan konduktivitas mempengaruhi nilai arus bocor dan tahanan isolasi. Pada variasi konduktivitas, nilai arus bocor dan tahanan isolasi meningkat seiring dengan kenaikan nilai konduktivitas.

Co-Authors A.I.W. Nugroho Abdul Syakur Abdul Syakur Afrisal, Hadha Agrial Sunahtul Putra Andhika Ilham Wahyu Nugroho Buntat, Zolkafle Didi Dwi Anggoro Faishal Fuad Rahman Soeharto Faris Cahya Priambada Hamzah Berahim Heri Sutanto I Ketut Suada Mochammad Facta Moh. Izzul Azmi P Purwanto Rizal Fajar Abdurrahman Salam, Zainal Salam, Zainal Sarjiya Slamet Supriyadi Soeharto, Faishal Fuad Rahman Susilawati, Dyah Ika Taubat Nasukha Yoga Fajar Setiaji Zainal Salam Zainal Salam Zakiy Hammami Zolkafle Buntat

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