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Politeknik egeri Ujung Pandang
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Rancang Bangun Electronic Load Control Generator pada Pembangkit Listrik Tenaga Mikro Hidro Berbasis Mikrokontroler dan IoT sofyan, sofyan; Naim, Kurniawati; Basri, Muh Arga
Jurnal Teknologi Elekterika Vol. 19 No. 1 (2022): Mei
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v6i1.3397

Abstract

Changes in frequency and voltage caused by erratic load changes on consumers of Micro Hydro Power Plants (MHP) can damage generators and household appliances consumers. This problem can be addressed by providing a replacement load. However, to optimize the replacement load, it is necessary to design a control system for the replacement load. This research was conducted to control the generator output when an erratic load change occurs. In addition, this study also aims to monitor the generator output remotely using the internet. Accordingly, the research was conducted with hardware design and software design. Data collection is done by testing technique, while data analysis is done by simple regression. Based on the results of research and discussion, it can be concluded that the use of design tools can control the replacement load and measure voltage, current, and frequency. The use of this tool can also monitor and store data using the GSM internet network so that monitoring can be carried out remotely
Analisis Sistem Koordinasi Proteksi Over Current Relay (Ocr) Dan Ground Fault Relay (Gfr) Tegangan 20 Kv Bay Trafo Pada Gardu Induk Sanga-Sanga Kalimantan Timur Thaha, Sarma; Indrawan, Andi Wawan; Pongkiding, Yosua Januarius
Jurnal Teknologi Elekterika Vol. 19 No. 2 (2022): Nopember
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v6i2.3527

Abstract

As a provider of electricity services, PLN is required to provide service and supply of electricity with good quality, continuity, improvement and efficiency. Disturbances in distribution systems are short circuit faults between phases or ground phase faults. To protect properly, proper coordination of relay settings is required. Among the equipment in the protection system used in distribution lines are overcurrent relays (OCR) and ground fault relays (GFR). In this study, an analysis of the OCR and GFR settings will be carried out on a 20 kV cubicle at the Sanga-Sanga Substation, East Kalimantan, with the help of the DigSILENT Power Factory 15.1.7 application with a disturbance simulation at 10% and 90% of the feeder length. Based on the analysis results, it is obtained that the short circuit results of 3 phases, 2 phases, and 1 phase to the ground have a value that is not much different from the calculation, while the OCR setting for the outgoing relay is 0.8 A on the secondary side. TMS is 0.083 seconds while the relay is on the incoming side of 20 kV 1 A and TMS of 0.198 seconds. The GFR setting for the outgoing relay is 0.06 A on the secondary side, and TMS is 0.1 seconds, and the relay on the incoming side is 20 kV 0.015 A and TMS is 0.26 seconds).
Studi Peningkatan Keandalan Dengan Penambahan Recloser Pada Penyulang Pajalau Pt. Pln (Persero) Ulp Kalebajeng Dengan Metode Section Technique sofyan, sofyan; Achmad, Alamsyah; Amal S P, Ikhlashul
Jurnal Teknologi Elekterika Vol. 19 No. 2 (2022): Nopember
Publisher : Jurusan Teknik Elektro Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/elekterika.v6i2.3688

Abstract

Keandalan penyaluran energi listrik ke konsumen sangat dipengaruhi oleh sistem pendistribusiannya. Untuk itu diperlukan sistem distribusi energi listrik dengan keandalan yang tinggi. Karena manfaat dan fungsi suatu sistem tenaga listrik yang sangat vital dalam kehidupan sehari-hari, maka diperlukan sebuah sistem tenaga listrik yang andal untuk penyediaan dan pendistribusian tenaga listrik pada jaringan distribusi tenaga listrik. Tujuan penelitian ini adalah untuk menghitung tingkat keandalan dan sekaligus melakukan upaya untuk meningkatkan keandalan  sistem distribusi 20 kV pada PT. PLN (Persero) ULP Kalebajeng dengan metode section technique, di mana nilai dari indeks kegagalan dari setiap peralatan utama sistem distribusi diperhitungkan untuk mencari nilai indeks keandalan sistem secara menyeluruh. Studi kasus dilakukan di PT. PLN (persero) ULP Kalebajeng. Pada tugas akhir ini, dilakukan studi peningkatan keandalan sistem distribusi 20 kV pada Penyulang. Tujuan yang ingin dicapai pada tugas akhir ini adalah sebagai evaluasi dalam memperbaiki kinerja peralatan yang ada pada Penyulang Pajalau. Metode yang digunakan antara lain pengumpulan data, pengolahan data, serta penganalisisan keandalan sistem distribusi 20 kV. Nilai indeks keandalan penyulang Pajalau yaitu SAIDI 22.348 jam/tahun dan SAIFI 4.494 kali/tahun. Hasil perhitungan dengan metode Section Technique nantinya akan dibandingkan dengan hasil dari simulasi ETAP setelah mengimplementasikan recloser pada penyulang
Rancang Bangun Sistem Proteksi Undervoltage dan Overvoltage pada Instalasi Bangunan Sederhana Berbasis Internet of Things Hidayat, Ananda; Sofyan, Sofyan; Thaha, Sarma
Prosiding Sains Nasional dan Teknologi Vol 11, No 1 (2021): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 11 2021
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/psnst.v1i1.4937

Abstract

Sistem proteksi listrik sangat dibutuhkan untuk menjaga keamanan suatu sistem kelistrikan. Pada instalasi bangunan sederhana hanya terdapat sebuah MCB (Miniatur Circuit Breaker) yang berfungsi sebagai proteksi ketika terjadi arus lebih dan hubung singkat pada instalasi listrik. Sehingga tidak dapat melindungi ketika terjadi gangguan undervoltage atau overvoltage yang dapat merusak perangkat rumah tangga yang digunakan. Tujuan penelitiaan ini ialah untuk merancang sistem proteksi tegangan berbasis Internet of Things yang dapat melindungi perangkat rumah tangga dari gangguan tegangan dengan toleransi undervoltage sebesar -10% dan overvoltage sebesar +5% dari tegangan standar 230 volt dan dapat juga memonitor secara online atau offline. Cara kerja sistem yaitu dengan pembacaan sumber tegangan oleh sensor PZEM-004T lalu dilakukan pengolahan data oleh mikrokontroler ESP32 dengan mengaktifkan alarm sebagai penanda ketika tegangan mendekati -2.5% dari batas toleransi tegangan dan relay memutuskan aliran arus jika tegangan melewati batas toleransi yang telah diatur. Pada saat pengujian sistem proteksi sudah bekerja sesuai dengan prinsip kerja dimana alarm aktif pada saat tegangan melewati dari 212.74 Volt sampai 235.74 Volt dan relay trip ketika tegangan melewati dari 207 Volt sampai 241.5 Volt dengan persentase error pembacaan nilai tegangan sebesar 0,84% dan jeda pengiriman data ke web server tergantung dari pengaturan jeda dan jaringan internet.
Effect of Carbon Nanotubes and Graphene Oxide on the Hydration Characteristics and Compressive Strength of Cement Mortar with High Volume Fly Ash Maizuar, Maizuar; Maulani, Emi; Usrina, Nura; Ersa, Nanda Savira; Sofyan, Sofyan; Mahmudy, Ash Shiddiq; Prasetia, Gigih
International Journal of Engineering, Science and Information Technology Vol 5, No 1 (2025)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v5i1.648

Abstract

High-volume fly ash (HFVA) in cement mortar has gained attention due to its potential to reduce environmental impact and enhance sustainability. However, HVFA mortar often exhibits reduced initial compressive strength compared to conventional mortars. Incorporating carbon nanotubes (CNT) and Graphene oxide (GO) has been shown to enhance the mechanical properties and microstructure of the mortar, which can overcome the shortcomings of HVFA. This study investigates the effect of CNT and GO on compressive strength and cement hydration of HVFA mortar. This study used fly ash as a 60% cement replacement, with 0.01% CNT and GO contents of 0.01%, 0.02%, 0.03%, 0.04%, and 0.05%. Compressive strength tests were performed at 3, 7, and 28 days of curing. The results showed that adding CNT and GO improved the compressive strength by 15.4% over the control mortar at 0.01% CNT and 0.03% GO. Most importantly, incorporating CNT and GO mitigated the typical reduction in initial compressive strength, with around a 15% increase observed at 3 and 7 days compared to the control mortar. The cement hydration characteristics were analyzed using X-ray diffraction (XRD), which revealed the presence of various crystallization phases, including calcium silicate hydrate (C-S-H), calcium aluminate silicate hydrate (C-A-S-H), quartz, portlandite, calcium carbonate, and ettringite. Adding CNT and GO to HVFA mortar significantly enhances its mechanical properties. It promotes the formation of complete chemical bonds in the cement hydration process, improving the mortar's overall performance.
Co-Authors Achmad, Alamsyah Ahmad Gaffar Ahmad Rosyid Idris Akhmad, Satriani Said Akhyar Muchtar, Akhyar Amal S P, Ikhlashul Amaliah, Asma Andi Fitriati Andi Wawan Indrawan Arifuddin Siraj Ashar AR Asia, Siti Nur Basri, Muh Arga Emi Maulani Ersa, Nanda Savira Hidayat, Ananda Lukman, Musfirah Putri Mahmudy, Ash Shiddiq Maizuar Maizuar Mardyawati, Mardyawati Mudinillah, Adam Muh. Syahiruddin H. Muhira Dzar Faraby, Muhira Dzar Mustika Mustika Naim, Kurniawati Nura Usrina Prasetia, Gigih Riantory Ahmad Rivani risaldi risaldi Ruslan L Rusman, Ismaun Sainah, Sainah Iin Sasi Kirono Sirad, Mochammad Apriyadi Hadi Sonita, Anisya Sumaryanti Sumaryanti Thaha, Sarma Yoan Elviralita Yuli Asmi Rahman