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All Journal Foristek Jurnal Amplifier: Jurnal Ilmiah Bidang Teknik Elektro dan Komputer International Journal of Engineering Continuity Emitor: Jurnal Teknik Elektro
Rodiah, Yuli
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Perancangan Sistem Pentanahan Pada Laboratorium Terpadu Fakultas Teknik Universitas Bengkulu Dengan Metode Two-Layer Soil Vertical Rod Configuration Herawati, Afriyastuti; Pakpahan, Roby Janaris; Rodiah, Yuli; Anggraini, Ika Novia
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 14 No. 1 (2024): Amplifier Mei Vol. 14, No. 1 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v14i1.33277

Abstract

Sistem pembumian adalah sistem proteksi yang sangat penting dalam instalasi listrik, karena berfungsi menyalurkan arus lebih ke dalam tanah, sehingga dapat mengamankan manusia dan gedung beserta peralatan listriknya. Impedansi pentanahan dipengaruhi oleh injeksi arus, konfigurasi pentanahan, dan faktor- faktor yang mempengaruhi tanah. Sistem pentanahan menggunakan metode two-layers soil vertical rod configuration dengan injeksi frekuensi dan variasi diameter silinder dilakukan untuk menganalisis impedansi sistem pentanahan. Modifikasi ini dilakukan dengan mengisi tanah di dalam grounding rod yang dibentuk silinder dengan variasi diameter 20 cm, 30 cm dan 40 cm dengan panjang tetap 1 m. Tanah yang digunakan pada pengisian silinder ialah tanah liat yang diambil dari percetakan batu bata, dengan adanya silinder maka terciptanya tanah dua lapis didalam silinder dan disekitar silinder. Jenis tanah didalam silinder tanah liat dan tanah disekitar silinder adalah tanah dibelakang laboratorium yang memiliki komposisi yang beragam. Batang grounding diinjeksi rentang frekuensi 50 Hz -2 MHz, hasil penelitian menunjukkan fluktuasi nilai resistansi dan impedansi pentanahan. Modifikasi batang silinder dan injeksi frekuensi memepengaruhi nilai resistansi dan impedansi. Impedansi paling kecil adalah pada batang silinder diameter 40 cm dan yang paling besar pada batang silinder diameter 20 cm. Sifat resistif, induktif dan kapasitif bergantung pada frekuensi injeksi.
RANCANG BANGUN ALAT PASTEURISASI NON THERMAL DENGAN PULSED ELECTRIC FIELD (PEF) Anggraini, Ika Novia; Simarmata, Elsara Krysti; Daratha, Novalio; Herawati, Afriyastuti; Rodiah, Yuli
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 11 No. 2 (2021): Amplifier November Vol. 11, No. 2 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v11i2.16383

Abstract

ABSTRACTPackaged beverages have become a product that is very much on the market both internationally and nationally. In the process of making packaged beverages, in order to last longer the microbes in the drink must first be inactivated in order for the drink to last longer, the microbial inactivation process in the drink is called pasteurization. Convernsional pasteurization is done by heating the drink to be in production. But the high temperature of the drink can change the taste, color, and even nutrition of the drink. This is underpinning the non-thermal pasteurization process by using high voltage impulses (Pulsed Electric Field,PEF). PEF is a technology that utilizes high voltage DC to produce a field between two electrodes. Pateurization occurs when between electrodes there is milk that is flowed with high voltage DC. High voltage generation is performed using flyback transformers with voltage output up to 30 kV. In the pasteurization process given 6 voltage variations namely 5, 10, 12,5, 15, 20, and 30 kV. Pasteurization results are then tested in fmipa microbiology laboratory to find out the success of the tools that have been made. In each voltage variation it is obtained that all treatments have reached pasteurized milk quality standards based on SNI where at 5kV voltage variation can inactivat microbes up to 83.33%, voltage variation of 10kV can inactivat microbes up to 94.5%, At a voltage variation of 12.5 kV can inactivae microbes up to 83.6%, 15kV voltage variation can inactivae microbes up to 88.8%, while voltage variation of 20 kV can inactivae microbes up to 84.2% and at voltage variation 30 kV can inactivae microbes up to 84.8%.Key Words: PEF, Flyback Transformer, ZVS Driver, Pasteurization.
Perhitungan Suhu Pada Bushing Transformator Unit II GI Pekalongan dengan Metode Elemen Hingga Herawati, Afriyastuti; Rosa, Muhammad Khairul Amri; Surapati, Alex; Handayani, Yanolanda Suzantry; Anggraini, Ika Novia; Rodiah, Yuli; Nugraha, Andi
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 12 No. 1 (2022): Amplifier Mei Vol. 12, No 1 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v12i1.21310

Abstract

The reliability of the power transformer depends on the performance of the its bushing. Transformer bushings subjected to hot conditions or high temperatures for a long period of time can cause bushing failure. Bushing failure can result the damage such as bursting of the conservator tank, explosion and fire. The purpose of this study was to determine the temperature hot spot on the transformer bushing at the Unit II Pekalongan Substation (GI) in order to avoid the damage of transformer. The method that used to analyze the hot spot temperature on the transformer bushing is the finite element. The finite element method is carried out by dividing the bushing parts into small elements to be calculated so that the hot spot temperature value on the transformer bushing is obtained. The result of the highest hot spot temperature on the transformer bushing which were carried out four times using the finite element method is . Based on the IEEE standard, the hot spot temperature of transformer bushing can’t be more than . This result showed that transformer bushng of Unit II Pekalongan Substation are still in the normal category.
Rancang Bangun Pembangkitan Generator Marx 10 Tingkat pada Uji Kapasitor 220 pF dan Lightning Protector Rodiah, Yuli; Putri, Nilda Tri; Anggraini, Ika Novia; Herawati, Afriyastuti; Rizki, M.
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 12 No. 2 (2022): Amplifier November Vol. 12, No. 2 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v12i2.24945

Abstract

The Marx generator circuit is an impulse voltage multiplier that is used to represent lightning overvoltage and switching overvoltage. In this research, a 10-level Marx Generator impulse generator design was carried out by varying the distance between the spark gaps of 2.5mm, 5.0mm, 7.5mm, and 10.0mm and the test load was a 220pF capacitor and a lightning protector. The results of the design and simulation of the 10-level Marx Generator produce an impulse voltage according to the IEC 60060-1 lightning impulses standard, which is 20.20kV with a wavefront and tail time of 2.29 µs and 52.3 µs. The test results for the 220pF capacitor load at a distance of 2.5 mm, the resulting voltage is 23.5 kV with a wavefront and tail time of 1.7 µs and 25 µs, while the lightning protector test load produces a voltage of 24 kV, with a wavefront and tail time of 2.1 µs and 43 µs
ANALISIS KARAKTERISTIK MINYAK TERHADAP TEGANGAN TEMBUS TIGA JENIS MINYAK SEBAGAI ALTERNATIF MINYAK ISOLASI TRANSFORMATOR Aggraini, Ika Novia; Situngkir, Hoklan Roianri Rifki Rinaldi; Rodiah, Yuli; Rinaldi, Reza Satria; Arfan, Muhmammad
Foristek Vol. 15 No. 1 (2025): Foristek
Publisher : Foristek

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54757/fs.v15i1.754

Abstract

This research seeks to assess the influence of viscosity and moisture content on the breakdown voltage of canola oil, corn oil, and sunflower seed oil, as well as to evaluate the quality and properties of these oils as potential alternative liquid insulations for transformers. Transformer liquid insulation specifications according to SPLN 50-1982 and IEC 60247:1991 standards include a breakdown voltage of 30 kV/2.5 mm, a maximum moisture content of 30 ppm or 0.003%, and a kinematic viscosity of 40 cSt at 20°C. During the assessment of moisture content and viscosity, two oil conditions are examined: fresh oil and old oil after the breakdown voltage test. The test data indicates that moisture content and viscosity influence breakdown voltage. Specifically, canola oil, with a moisture content of 0.17% and a viscosity of 28 cSt, exhibits a breakdown voltage of 20.5 kV/2.5 mm; corn oil, with a moisture content of 0.11% and a viscosity of 27 cSt, demonstrates a breakdown voltage of 25.3 kV/2.5 mm; sunflower seed oil, with a moisture content of 0.12% and a viscosity of 26 cSt, shows a breakdown voltage of 21.5 kV/2.5 mm. Nevertheless, the test findings indicate that the breakdown voltage fails to comply with the transformer insulating oil requirement.
Photovoltaic System Performance Analysis with the Application of Hybrid Maximum Power Point Tracking Based on Incremental Conductance (INC) Oktavia, Sari; Herawati, Afriyastuti; Satria Rinaldi, Reza; Rodiah, Yuli
Emitor: Jurnal Teknik Elektro Vol 25, No 2: July 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/emitor.v25i2.11976

Abstract

It requires work to maximize photovoltaic (PV) power output in order to maximize solar panel input to the battery and avoid overcharging or overdischarging. A technique to determine the value of the maximum power point (MPPT) is required in order to enhance the performance of photovoltaic systems and guarantee that solar panels run at the MPP. In the application of Standard Test Conditions (STC) in comparing the application without using MPPT, INC-based MPPT, and GWO-INC MPPT, it is found that to achieve the maximum power point of the panel, it is good to use the hybrid MPPT GWO-INC application, which gets the maximum power point tracking efficiency value of 64.34% and solar panel efficiency of 12.86% compared to without using MPPT which only gets the maximum power point tracking efficiency value of 52.9% with panel efficiency of 10.58%.
Genetic Algorithm-Based Contingency Ranking for the 500 kV JAMALI Interconnection System Priyadi, Irnanda; Daratha, Novalio; Rodiah, Yuli; Anggraini, Ika Novia; Sutradi, Tri; Sri Wahyuni, Ade; Reza Razali, Makmun
International Journal of Engineering Continuity Vol. 4 No. 2 (2025): ijec
Publisher : Sultan Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58291/ijec.v4i2.332

Abstract

The performance of an electric power system is strongly tied to how well it can handle disturbances. In daily operation, one of the most frequent and serious disturbances is the loss of a transmission line. When a line trips, its load must be shared by the rest of the network. Sometimes this redistribution is harmless, but in stressed conditions it can create overloads and trigger further outages. To reduce this risk, system operators rely on contingency analysis. The (N-1) criterion, which considers the effect of losing a single component, is the most common standard. However, when applied to a large network, the number of cases becomes very high, and the analysis can be time-consuming. In this work, contingency ranking using a Genetic Algorithm (GA) is studied for two systems: the IEEE 30-bus test grid and the 500 kV Java–Madura–Bali (JAMALI) interconnection in Indonesia. The GA follows the usual cycle of initialization, selection, crossover, mutation, and fitness evaluation, with the Voltage Performance Index (VPI) used to measure severity. Different parameter settings were tested. The results show that line 36 (bus 28–27) is most critical in the IEEE 30-bus system with a VPI of 56.5915, while line 35 (Bangil–Paiton) is most critical in the JAMALI system with a VPI of 95.3947. These outcomes highlight the usefulness of GA in identifying vulnerable transmission lines.
Co-Authors Aggraini, Ika Novia Andi Nugraha Anggraini, Ika Novia Arfan, Muhmammad Daratha, Novalio Handayani, Yanolanda Suzantry Herawati, Afriyastuti Irnanda Priyadi Nilda Tri Putri Oktavia, Sari Pakpahan, Roby Janaris Reza Razali, Makmun Reza Satria Rinaldi Rizki, M. Rosa, Muhammad Khairul Amri Simarmata, Elsara Krysti Situngkir, Hoklan Roianri Rifki Rinaldi Sri Wahyuni, Ade Surapati, Alex Sutradi, Tri