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JURNAL NASIONAL TEKNIK ELEKTRO

JNTE
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Published by Universitas Andalas

ISSN : 23022949 EISSN : 24077267 DOI : -

Core Subject : Engineering,

Electrical & Electronics Engineering

Jurnal Nasional Teknik Elektro (JNTE) adalah jurnal ilmiah peer-reviewed yang diterbitkan oleh Jurusan Teknik Elektro Universitas Andalas dengan versi cetak (p-ISSN:2302-2949) dan versi elektronik (e-ISSN:2407-7267). JNTE terbit dua kali dalam setahun untuk naskah hasil/bagian penelitian yang berkaitan dengan elektrik, elektronik, telekomunikasi dan informatika.

Arjuna Subject : -

Articles 610 Documents

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Rekonfigurasi Jaringan Distribusi Listrik Universitas Andalas Untuk Memperbaiki Indeks Energy Not Supplied Shaumi Novila Asri; Adrianti Adrianti; Muhammad Nasir
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 1: March 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

This research aims to improve the reliability of electrical distribution networks of Universitas Andalas using network reconfiguration. Reliability calculation is carried out using series-parallel block diagram. The calculated reliability indexes are failure rates, annual down times and energy not supplied (ENS). The reconfiguration is focused for load points that have highest ENS. For these load points, reconfiguration was done by transferred their power supply to nearer distribution substation by installed new feeders. As a result, the distribution network changes it shape into loop configuration, although during operation it still has radial configuration. The reconfiguration has been success in reducing the ENS values of Universitas Andalas distribution network. The highest load point’s ENS i.e. 315,191 kWh/year has been reduced into 142,864 kWh/year. Keywords : Energy not supplied, reliability, reconfiguration, distribution networkAbstrakPenelitian ini bertujuan untuk memperbaiki keandalan jaringan distribusi listrik Universitas Andalas dengan rekonfigurasi jaringan. Perhitungan keandalan dilakukan menggunakan metode blok diagram seri-paralel. Parameter keandalan yang dihitung yaitu laju kegagalan, annual downtimes serta Energy Not Supplied (ENS). Rekonfigurasi dilakukan dengan fokus pada titik-titik beban yang memiliki indeks ENS yang terbesar. Titik-titik beban tersebut direkonfigurasi dengan memindahkan supply dayanya ke gardu yang lebih dekat dengan penambahan saluran baru. Akibatnya bentuk jaringan berubah menjadi konfigurasi loop, tetapi pada saat beroperasi jaringan tetap dalam konfigurasi radial. Dari rekonfigurasi yang diusulkan, nilai ENS sistem distribusi Universitas Andalas berhasil diturunkan dari nilai tertinggi 315,191 kWjam/tahun menjadi 142,864 kWjam/tahun. Sehingga lama dan frekuensi pemadaman listrik di titik-titik beban berhasil dikurangi yang pada akhirnya diharapkan dapat membantu meningkatkan produktivitas di Universitas AndalasKata Kunci : Energy not supplied, keandalan, rekonfigurasi, jaringan distribusi

Migration Between Two Inverse Time-Overcurrent Curves of Different Standard: Experience at Siguragura Power Station Bagus Brahmantya Gautama
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 2: July 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

The inevitable replacement of electro-mechanical protection relays with more recently-developed microprocessor-based protection relays poses challenges to engineer, one of which is migration from existing manufacturer’s non-standard inverse time-overcurrent curve to, usually, IEC 60255-151 or IEEE Std C37.112-1996 curve. To satisfy the required protection coordination, one may perform new study of protection coordination for the system in total, prior to replacement program. However, this exhaustive approach can be avoided by emulating existing non-standard inverse time overcurrent curve on the new microprocessor-based protection relay, provided that such curve is still adequate to be re-implemented. This paper aims to develop general procedure using nonlinear curve fitting to determine the most appropriate setting of microprocessor-based protection relay. The general procedure has been tested during renewal of feeder protection relay at Siguragura Power Station.

Desain dan Implementasi Akuisisi Data Suhu Murid Sekolah Berbasis Arduino Untuk Monitoring Kesehatan Komunal Munaf Ismail; Arttini Dwi Prasetyowati; Jenny Putri Hapsari
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 2: July 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

Abstrak—Jumlah kasus demam berdarah dengue sebanyak 1.204 kasus terjadi di provinsi Jawa Tengah pada periode Januari 2019. Salah satu sekolah dasar di kecamatan Genuk kota Semarang terjadi endemi, dimana 2 siswa meninggal dan 5 siswa lainnya dirawat di rumah sakit karena difteri pada tahun 2018. Kesadaran untuk menjaga kesehatan dan memeriksa kesehatan secara teratur di rumah atau sekolah penting untuk menghindari generasi penerus bangsa dari penyakit berbahaya. Penelitian ini merancang dan mengimplementasikan sensor suhu tubuh yang terintegrasi dengan sensor sidik jari basis Arduino serial komputer. Akuisisi data suhu tubuh siswa sangat penting pada anak-anak yang tidak dapat memahami demam tubuh mereka. Inovasi sensor suhu MLX90614 dikombinasikan dengan sensor sidik jari berbasis Arduinoserial komputer. Aplikasi ini berfungsi sebagai perekam suhu tubuh siswa dan kehadiran siswa untuk disimpan di komputer. Hasil pengukuran menunjukkan hasil yang baik karena kesalahan rata-rata di bawah 5%, kesalahan terbesar adalah 3,41% dan terendah adalah 2,01%. Hasil pengukuran juga menunjukkan nilai presisi tertinggi 95,88% dan akurasi tertinggi 99,24%. Database suhu siswa akan berfungsi sebagai deteksi dini demam siswa serta pemeriksaan kesehatan berkala sebagai upaya bersama untuk menjaga kesehatan anak-anak sekolah dan memberikan informasi yang akurat ketika siswa sakit dan dibawa ke dokter.

Noise Reduction on The Use of Different Ground Model on The EMI Filter of Reading LED Lighting for Passenger Train Haryo Dwi Prananto; Muhammad Imam Sudrajat; Priyo Wibowo; Yoppy Yoppy; R. Harry Arjadi
JURNAL NASIONAL TEKNIK ELEKTRO Vol 9, No 1: March 2020
Publisher : Jurusan Teknik Elektro Universitas Andalas

Initial measurement showed that reading LED lighting used in this experiment produced excessive conducted emissions (CE). EMC filter is needed to suppress the CE noise. The LED light is AC powered through a two-wire cable without ground wire, whereas the EMC filter does have ground. Experiments were conducted to find out the attenuation effect of different filter’s grounding connection methods. Four cases of grounding connections are measured and compared, i.e. unconnected ground, earth-connected ground, chassis-connected ground, and additional ground plate. Measurements showed that chassis-connected ground had the strongest attenuation effect. Also, for the additional ground plate configuration, it turned out that larger plates exhibited stronger attenuation compared to smaller plates.Keywords : LED driver, EMC Filter, grounding, impedance, common mode

Potential for Energy Savings in Educational Institutions in Ghana Elvis Twumasi; Emmanuel Asuming Frimpong; Leslie Novihoho
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 3: November 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

This paper presents the results of an energy audit carried out to assess the potential of energy savings in educational institutions in Ghana using the Kwame Nkrumah University of Science and Technology (KNUST) as the case study institution. It also outlines a simple and effective technique for such an audit. The College of Engineering; one of the six Colleges of KNUST was used as the study location. Light bulbs and fans at the classrooms, corridors, laboratories and washrooms were monitored for energy wastage. The monitoring period was one month. The energy wastage over the period was estimated to be 1718.24kWh, which is high. The yearly energy wastage at KNUST for the areas assessed is projected to be 95.276MWh, which is alarming. Urgent steps are therefore needed to curb this wastage.Keywords: Energy auditing, Energy efficiency, Energy efficiency measures, Energy saving and Energy wastage

The Use of Instrumentation Amplifiers and Voltage-to-Current Converter In a Process Control : Simulation and Implementation Arief Wisnu Wardhana; Mulki Indana Zulfa
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 3: November 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

Signal in the form of voltage are often need to be transmitted when we deal with measurement. However, voltage signal transmission creates many problems. The series resistance that appears between the output of the signal conditioner and the load produces some voltage drop. Even a few millivolts of the voltage drops could significantly alter the percentage error of the measurement. Current signal is the same everywhere in a series loop. So, by converting the signal into a current and then sending the current signal will assures that the load will receive all of the signal we sent. In this paper, a simulation and an implementation of using instrumentation amplifiers and V-I converter for sending a voltage signal has been conducted. The process variable being measured is a differential pressure that is sensed by a pressure sensor. The output voltage signal was then amplified by an instrumentation amplifier and fed to a V-I converter for transmission purpose. The results is an increase in output current when the presssure was increased. It can be concluded that the instrumentation amplifier and V-I converter are the devices that are properly used for a voltage signal transmission. Keywords : Instrumentation amplifiers, signal transmission, V-I converter, voltage signal, current signal, pressure sensors.

OTOMATISASI SENSOR LOAD CELL UNTUK MENGATASI OVERLOAD KENDARAAN Rahmadi Kurnia; Rifki Firdaus; Lucyana Lufti; Muhammad Habib Anshor
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 2: July 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

Kelebihan muatan merupakan suatu hal yang sering diabaikan oleh para pengemudi. Padahal, kelebihan muatan memberikan dampak di berbagai sisi. Peningkatan emisi gas buang, kerusakan badan jalan, bahkan kecelakaan lalu lintas dapat diakibatkan oleh kelebihan muatan kendaraan. Jembatan timbang merupakan seperangkat alat untuk menimbang kendaraan yang dipasang secara tetap merupakan solusi yang ditawarkan pemerintah untuk mengatasi masalah tersebut. Namun sayangnya masih sering ditemukan pengemudi yang mengangkut beban melebihi batas angkut yang ditetapkan oleh pemerintah. Tujuan perancangan ini adalah menghasilkan prototipe kendaraan bak terbuka yang mampu mencegah mesin kendaraan tersebut beroperasi dengan kondisi beban berlebih dengan mengetahui hasil pembacaan sensor load cell. Perancangan sistem dan prototipe ini merupakan perancangan yang menyerupai sistem lift. Alarm peringatan, pintu tidak dapat ditutup serta lift tidak dapat dioperasikan merupakan indikator yang menandai bahwa lift dalam kondisi kelebihan muatan. Dengan mengadopsi sistem lift ini, maka dirancanglah suatu prototipe machine-stopping system suatu sistem built-in yang terdiri dari komponen berupa buzzer, relay, LED dan motor servo yang akan menghalangi suatu kendaraan beroperasi dalam keadaan kelebihan muatan.

Average Voltage and Multilayer Perceptron Neural Network Based Scheme to Predict Transient Stability Status Emmanuel Asuming Frimpong; Philip Okyere; Johnson Asumadu
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 2: July 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

This paper presents a technique that predicts the transient stability status of a power system after a disturbance. It uses generator bus voltage as input parameter and a trained single-input multilayer perceptron neural network (MLPNN) as decision tool. When activated, the scheme samples voltages of all generator buses. Two sets of voltage values are extracted from each sampled generator bus voltage. For each set, the minimum voltage value is obtained. An average value is computed from the minimum voltage values extracted from the first sample sets of the various generator buses. The average value is then used to compute the deviations of the minimum voltage values from the second sets of data. The deviations are then summed and used as input to a trained MLPNN which indicates the stability status. The technique was tested using the IEEE 39-bus test system and its accuracy found to be 98.97%.

Analisa Kinerja Automatic Voltage Regulator Dalam Domain Waktu Menggunakan Metoda Ziegler-Nichols Dengan Pendekatan First Order Plus Dead Time Heru Dibyo Laksono; N. Riska; Novizon Novizon
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 3: November 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

Electric power systems produce power that can be used for various purposes. The distribution of electrical power and its relationship to the voltage and current generated by the generator. Voltage can change with changes in load. The change of voltage is undesirable due to it can cause disturbances to the power system. A device called Automatic Voltage Regulator (AVR) is used to maintain the voltage stable. This AVR is equipped with a control system to get the voltage stability following the specified criteria. In this study, the Ziegler -Nichols (Z-N) method is used with the First Order Plus Dead Time (FOPDT) approach. FOPDT is used for AVR control based on frequency response and transfer function methods. AVR used is direct current type AVR. The design that fulfils the criteria for controlling the voltage transfer response of direct current type AVR systems is the Proportional Integral Differential (PID) controller. This PID is designed using the Ziegler-Nichols method with the FOPDT approach based on the transfer function method. Information on the simulation results of the direct current type of system switching AVR response is obtained where the steady-state error value is 0.0000, the rise time value is 0.6114 seconds, the peak time value is 1.4391 seconds, the peak value is 1.1492 seconds, the maximum throughput is 14.942% and time to state steady reaches value at 2.5562 seconds. The values of parameter control are k of 13.2000, L of 0.4283, T of 1.0817, Proportional constant (Kp) of 0.2296, integral time constant (Ti) of 0.8564 and differential time constant (Td) of 4.6667.Keywords : Ziegler-Nichols, Fisrt order plus dead time, Automatic voltage regulator, Transient analysis AbstrakSistem tenaga listrik menghasilkan daya yang dapat di gunakan untuk berbagai keperluan. Penyaluran daya listrik ini erta hubungan nya dengan tegangan dan arus yang di hasilkan oleh pembangkit. Tegangan dapat berubah-ubah dengan berubahnya beban. Perubahan tegangan ini tidak diinginkan karena dapat mengakibatkan gangguan pada sistem tenaga. Untuk menjaga agar tegangan tetap stabil digunakan Automatic Voltage Regulator (AVR). AVR ini dilengkapi dengan sistim pengendalian untuk mendapatkan kestabilan tegangan sesuai dengan kriteria yang di tetapkan. Pada penelitian ini digunakan metoda Ziegler -Nichols (Z-N) dengan pendekatan First Order Plus Dead Time (FOPDT) berdasarkan tanggapan frekuensi dan metoda fungsi alih sebagai metoda pengendali AVR dan AVR yang digunakan adalah AVR tipe arus searah.Pengendali yang memenuhi kriteria rancangan untuk pengendalian tanggapan peralihan tegangan sistem AVR tipe arus searah adalah pengendali Proporsional Integral Diferensial (PID). Pengendali Proporsional Integral Diferensial (PID) ini dirancang dengan menggunakan metoda Ziegler-Nichols dengan pendekatan First Order Plus Dead Time (FOPDT) berdasarkan metoda fungsi alih. Informasi hasil simulasi tanggapan peralihan sistem AVR tipe arus searah yang diperoleh dimana nilai kesalahan keadaan mantap sebesar 0.0000, nilai waktu naik sebesar 0.6114 detik, nilai waktu puncak sebesar 1.4391 detik, nilai puncak sebesar 1.1492 detik, nilai lewatan maksimum sebesar 14.942 % dan nilai waktu keadaan mantap sebesar 2.5562 detik. Untuk nilai parameter pengendali yang digunakan adalah k sebesar 13.2000, L sebesar 0.4283, T sebesar 1.0817, konstanta Proporsional (Kp) sebesar 0.2296, konstanta waktu integral (Ti) sebesar 0.8564 dan konstanta waktu diferensial (Td) sebesar 4.6667.Kata Kunci :Ziegler-Nichols, Fisrt order plus dead time, Automatic voltage regulator, Analis peralihan

Penentuan Posisi Sudut Matahari Menggunakan ANFIS dalam Aplikasi Tracker Panel Surya Muhammad Irfan; Ilham Pakaya; Amrul Faruq
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 3: November 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

Solar panels have constraints on output power that are not large enough and they are highly depend on natural conditions. Solar panel power depends on the intensity of sunlight received and the temperature of the surrounding environment. In order to get the maximum output power of the solar panel, an additional device called the solar tracker is needed. This research has contributed to increasing the output power of solar panels by directing solar panels perpendicular to sunlight. The use of this research is very useful in the application of the multi-axis tracker application from the sun. By knowing the rising angle of the sun every morning and the circulation angle to sunset, the tracker will work quickly so that the energy used for movement is very small. The reference angle generated by the ANFIS training algorithm is more accurate because the calculated data will be confirmed again by the sensor. And this system can work offline, without being connected to a data center, so it can be used in remote or isolated areas.Keywords : Sun Tracking System, MPPT, ANFIS, Solar Panels AbstrakPanel surya memiliki kendala pada daya keluaran yang tidak cukup besar dan sangat tergantung oleh kondisi alam. Daya panel surya sangat tergantung dari intensitas cahaya matahari yang diterima dan suhu lingkungan sekitar. Agar mendapatkan daya keluaran panel surya yang maksimal dibutuhkan perangkat tambahan yang disebut tracker matahari. Penelitian ini memiliki kontribusi dalam meningkatkan daya keluaran panel surya dengan mengarahkan panel surya tegak lurus dengan cahaya matahari. Penggunaan penelitian ini sangat bermanfaat dalam penerapan aplikasi tracker multiaxis dari matahari. Dengan mengetahui sudut terbitnya matahari pada setiap pagi hari dan sudut edar sampai dengan terbenam, tracker akan bekerja dengan cepat sehingga energi yang digunakan untuk pergerakan sangat kecil. Sudut referensi yang dihasilkan oleh algoritma pelatihan ANFIS, lebih akurat karena data hasil perhitungan akan dikonfirmasi kembali oleh sensor. Serta sistem ini dapat bekerja secara offline, tanpa terhubung dengan pusat data, sehingga dapat digunakan pada area terpencil atau terisolasi.Kata Kunci : Posisi Sudut Matahari, MPPT, ANFIS, Panel Surya

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Syafii

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jnte@ft.unand.ac.id

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