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All Journal Electrician : Jurnal Rekayasa dan Teknologi Elektro Nemui Nyimah
Sony Ferbangkara
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Agriculture, Biological Sciences & Forestry Humanities Control & Systems Engineering Electrical & Electronics Engineering Engineering Environmental Science Other

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Karakterisasi Dinamis Tegangan Primer dan Sekunder pada Transformator Auxiliary akibat Beban Motor yang Berubah Ubaidah; Fahrur Riza Priyana; Yudi Eka Putra; Sony Ferbangkara
Electrician : Jurnal Rekayasa dan Teknologi Elektro Vol. 19 No. 2 (2025)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/elc.v19n2.2815

Abstract

Auxiliary transformers play a crucial role in maintaining the stability of electrical systems, especially when facing load changes caused by motor disconnection. This study aims to analyze the impact of current and voltage on Unit 3 auxiliary transformer due to the disconnection of vacuum pump motor A (500 kW) and vacuum pump motor B (500 kW) from the system. Simulations were conducted under three main conditions: normal operation without load disconnection, disconnection of vacuum pump motor A, and simultaneous disconnection of both vacuum pump motors A and B. The simulation results indicate that under normal conditions without load, the current and voltage on the primary side of the transformer are 283.9 A and 11 kV, while on the secondary side they are 495.7 A and 6.212 kV. When vacuum pump motor A is disconnected, transient current and voltage on the primary side range from 257.8 A to 250.1 A, with voltage fluctuating from 11 kV to 11.033 kV. In the case of both motors being disconnected, transient current and voltage on the primary side range from 231.8 A to 217.3 A, with voltage changing from 11 kV to 11.067 kV, while on the secondary side, the current drops from 404.7 A to 379.4 A, and voltage increases from 6.212 kV to 6.304 kV. These findings provide a clear depiction of the dynamic characteristics of the auxiliary transformer due to motor load variation and its impact on the stability of the electrical system.
Penerapan Otomatisasi Penerangan Jalan Umum Tenaga Surya (PJU-TS) Untuk Energi Berkelanjutan di Desa Sri Agung Lampung Tengah Ubaidah; Ahmad Saudi Samosir; Sony Ferbangkara; Martinus; Al Fariziy, M. Naufal
Nemui Nyimah Vol. 5 No. 1 (2025): Nemui Nyimah Vol. 5 No. 1 2025
Publisher : FT Universitas Lampung

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Abstract

Desa Sri Agung, Kecamatan Padang Ratu, Kabupaten Lampung Tengah, faces issues with several road sections where the street lighting system is not functioning to enhance nighttime visibility. To address this problem, Solar-Powered Public Street Lighting (PJU-TS) was installed. This system utilizes a Light Dependent Resistor (LDR) to detect light intensity and employs an IC 7805 as a voltage regulator. The PJU-TS lights automatically turn on at night in dark environmental conditions and turn off during the day by utilizing solar energy as the primary power source, thereby reducing dependence on conventional electricity. This activity consists of several methodological steps, including field surveys, system design, installation, and performance evaluation of the PJU-TS. The installation was carried out in two strategic locations involving the local community at several points along the roads in Sri Agung Village.. The evaluation results indicate that the PJU-TS system functions optimally to improve road visibility. However, there are still issues with the energy storage battery capacity, which remains small and affects lighting duration. The implementation of public street lighting with Solar Technology (PJU TS) in Sri Agung Village has had a significant impact on improving accessibility, security, and energy efficiency. Additionally, it helps promote energy sustainability and raises public awareness of the use of environmentally friendly technology.
Co-Authors Ahmad Saudi Samosir Al Fariziy, M. Naufal Fahrur Riza Priyana Martinus Ubaidah Yudi Eka Putra