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All Journal Jurnal Surya Teknika Jurnal Amplifier: Jurnal Ilmiah Bidang Teknik Elektro dan Komputer Emitor: Jurnal Teknik Elektro JES-TM Social and Community Service
Herawati, Afriyastuti
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Other

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Analisis Pelepasan Beban Sistem Jaringan Bengkulu dengan Penambahan PLTU Teluk Sepang 2x100 MW Herawati, Afriyastuti
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 13 No. 1 (2023): Amplifier Mei Vol. 13, No. 1 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v13i1.27361

Abstract

Load shedding is one way to overcome the rapid decrease in frequency due to transient disturbances. With load shedding the rate of decrease in system frequency can be slowed down so as to avoid total blackouts in the power system. Currently, the Bengkulu network system has added a new power plant, namely PLTU 2 x 100 MW in Teluk Sepang. This paper analyzes load shedding on the Bengkulu network system after the inclusion of PLTU Teluk Sepang. The proposed method is load shedding taking into account the Rate Of Change Of Frequency (ROCOF) and critical fault clearing time (CCT) after a transient fault occurs and then analyzing the stability of the system transient before and after the load shedding occurs with three phase short circuit disturbance. The analysis found that the proposed method succeeded in returning the dropped frequency to the permitted frequency value and the system showed a stable response after a transient disturbance occurred.
Analisis Perubahan Besaran Listrik Pada Pemanas Induksi Menggunakan Inverter Setengah Jembatan Anggara, Sandy; Herawati, Afriyastuti; Priyadi, Irnanda; Anggraini, Ika Novia
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 10 No. 1 (2020): Amplifier Mei Vol. 10, No. 1 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v10i1.15167

Abstract

AbstrakNowadays induction heating has become one of the people's choices in the heating process both in industry and households. Induction heating technology is also growing. But the electrical quantities that change with the temperature changes in the induction heating process must also be analyzed. To make induction heating, we need a device that is capable of producing large electrical energy. This tool uses a 12 Volt DC voltage, strong current 10 ampere and with a 120 watt input power. This induction heater is made using a half bridge inverter which generates heat through waves at high frequencies. The resonant frequency used is 25kHz. From the test obtained an average temperature increase of 134.5 ° C at the 600th second with a paper clip load and with a voltage of 3.33 Volts, a current of 0.15 A, a power of 0.56 watts, and a heat of 19.5J, and a test with a load nails obtained an average temperature of 136 ° C at 360 seconds with a voltage of 4.54 V, a current of 0.27 A, power of 1.12 watts, and a heat of 33.6JKata kunci : Pemanas Induksi, frekuensi, suhu, Solenoide.
Aplikasi Lucutan Plasma Corona Dalam Pengolahan Limbah Cair Kelapa Sawit Pamungkas, Adityo; Anggraini, Ika Novia; Rosa, M. Khairul Amri; Herawati, Afriyastuti
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 10 No. 2 (2020): Amplifier November Vol. 10, No. 2 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v10i2.15313

Abstract

ABSTRACT The green revolution in the field of palm oil farming not only contributes to processed products but also produces large-capacity waste originating from its processing starting from the sterilization process, water from the clarification process, hydro cyclone (clay bath) water, and factory washing water. Palm oil mill effluent (LCPKS) contains dissolved and suspended solids in the form of colloids and oil residues with high BOD and COD. If this liquid waste is discharged directly into the water, it can pollute the environment. Some will settle, decompose slowly, consume dissolved dcxdcoxygen, cause turbidity, emit a sharp odor and can damage the aquatic ecosystem. To improve the parameters in the LCPKS so that it is feasible to flow to water bodies or the environment, an LCPKS treatment experiment test is performed by applying corona discharge with variations in voltage and length of time, then comparing the effect on parameters such as BOD, COD, pH and TDS on LCPKS before treatment and after treatment. From the treatment process using a corona discharge application with variations in voltage and time able to reduce BOD levels up to 35%, COD 36%, increase in TDS reached 71.56% and decreased pH by 4.11%.Key words: Palm oil mill effluent (LCPKS), Corona discharge application (Corona Discharge Treatment), COD, BOD, TDS, pH
Analisis Sistem Pentanahan Instalasi Listrik Gedung Lembaga Pemasyarakatan Kelas IIa Bengkulu Santoso, Agung; Herawati, Afriyastuti; Handayani, Yanolanda Suzantry
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 10 No. 2 (2020): Amplifier November Vol. 10, No. 2 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v10i2.15320

Abstract

ABSTRAKListrik dalam kehidupan sehari merupakan suatu hal yang sudah menjadi kebutuhan pokok. Dalam kehidupan rumah tangga disatu sisi listrik memiliki banyak manfaat tetapi disisi lain memiliki resiko besar yang dapat membahayakan bagi pemakaianya apabila salah dalam penanganan dan penggunaanya sehingga akan berakibat fatal sampai merenggut nyawa manusia. Adapun pemasangan instalasi listrik di indonesia telah diatur sesuai dengan Persyaratan Umum Instalasi Listrik (PUIL 2000). Teknik pengumpulan data yang digunakan dalam penyelesaian penelitian ini dengan observasi. Langkah penelitian dimulai dari tahap persiapan meliputi perijinan dan penelusuran pustaka. Kemudian pengukuran dan pengambilan data resistansi pentanahan untuk sistem pentanahan Lapas Kelas IIA Bengkulu dan dilanjutkan dengan perhitungan serta perbandingan. Hasil keseluruhan penelitian yang telah dilakukan, menyatakan bahwa nilai tahanan pentanahan pada gedung – gedung Lapas Kelas IIA Bengkulu jika dilihat dari hasil perbandingan nilai tahanan pentanahan yang diukur didapatkan nilai tertinggi sebesar 14 Ohm sedangkan nilai tahanan pentanahan terendah 11 ohm dan dibandingkan dengan nilai tahanan sesuai dengan standart PLN untuk rumah tinggal/gedung maka didapatkan bahwa sistem pentanahan di Lapas Kelas IIA bengkulu belum memenuhi standart PLNKata kunci: Grounding, nilai pentanahan, elektroda
Analisis Pengaruh Sudut Penyalaan TRIAC terhadap Pengaturan Kecepatan Motor Induksi Satu Fasa Menggunakan Cycloconverter Herawati, Afriyastuti; Saputra, Muhammad Alvin; Anggraini, Ika Novia
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 11 No. 1 (2021): Amplifier Mei Vol. 11, No. 1 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v11i1.15766

Abstract

ABSTRACTA single-phase induction motor is one type of electric motor that is most widely used in everyday’s life, especially for running small loads. The application of this single phase induction motor is not only in households but also in shops, shopping centers, and industry. In its operation, single-phase induction motors can be operated with constant speed and variable speed. The operation of a single-phase induction motor at a constant speed can be done by inputting the nominal voltage and frequency of the motor. Meanwhile, the operation of a single-phase induction motor with varying speeds can be done by adjusting the input frequency of the motor. In this study, an induction motor speed control was carried out using a cycloconverter to regulate the speed of a single-phase induction motor by changing the input frequency of the motor into three variations, namely f / 1, f / 2 and f / 3 at the base frequency of 50 Hz. The cycloconverter switching was designed using TRIAC and then a study was carried out on the effect of the TRIAC’s firing angle on the speed, voltage and output power of the motor by varying firing angles by 0?, 30?, 45?, 60? and 90?. The result show, it is found that increasing the firing angle, the motor output voltage decrease, the motor output power also decrease, except at the angle of 60 ? rises then at the angle of 90 decrease again, while the motor speed increases at the same frequency.  Keyword: cycloconverter, firing angle, TRIAC.
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.
Analisis Aliran Daya Pada Sistem Stand Alone Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) Al Hanan Dengan Metode Newton Rhapson Herawati, Afriyastuti; Putra, Ripo Utama; Handayani, Yanolanda Suzantry; Anggraini, Ika Novia
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.v12i2.24504

Abstract

Analysis of power flow in the power system is used to determine the parameters of the system itself. The benefit of the power flow analysis is to determine whether the amount of power in the electric power system still meets the predetermined limits, as well as to determine the number of existing losses, and to obtain the initial conditions for planning the new system. To solve the power flow problem, a power flow simulation can be performed using ETAP software. Simulations were carried out using the Newton-Rhapson method to determine the flow of power during the rainy and dry seasons. The results of the power flow simulation in the rainy season show that the highest active and reactive power values ​​are found in bus 1, namely 156.78 kW and 101.77 kVAR, while the simulation during the rainy season shows the highest active power and reactive power in bus 1, which is 137.85 kW and 88.97 kVAR. Then the highest voltage drop in the rainy season is 3.11% and the dry season is 2.78%. The Newton-Rhapson method requires 2 iterations to reach a convergent value.
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
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%.
Co-Authors Agung Santoso, Agung Andi Nugraha Anggara, Sandy Anggraini, Ika Novia Apriansyah, Yudi Claudia, Rany Daratha, Novalio Habibullah, Natsir Handayani, Yanolanda Suzantry Irnanda Priyadi Ladio, Wahyu Apriali Nilda Tri Putri Oktavia, Sari Pamungkas, Adityo Putra, Ripo Utama Reza Satria Rinaldi Rizki, M. Rodiah, Yuli Rosa, M. Khairul Amri Rosa, Muhammad Khairul Amri Saputra, Muhammad Alvin Simarmata, Elsara Krysti Surapati, Alex Syamsiar, Syamsiar