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All Journal ELPOSYS: Jurnal Sistem Kelistrikan Jurnal ELTEK
Satria Luthfi Hermawan
Politeknik Negeri Malang
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering

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Audit Energi dan Penilaian Kualitas Daya Pada Penerangan Jalan Umum Politeknik Negeri Malang Ahmad Hermawan; Galih Hardika Sakti; Ferdian Ronilaya; Satria Luthfi Hermawan
Elposys: Jurnal Sistem Kelistrikan Vol. 9 No. 3 (2022): ELPOSYS vol.9 no.3 (2022)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (574.786 KB) | DOI: 10.33795/elposys.v9i3.659

Abstract

Public Street Lighting (PSL) is an important thing for campus residents especially in night time activities. PJU also function as the beauty and comfort of college student when doing activities / organization at night and also influencing the results of carried active by college student. PSL also serve to ease visions for campus guard so that it is easier to see or supervise the area around the campus from thieves or individuals who want to behave crimefully at State Polytechnic of Malang
Annealing effects on single-phase E-I transformer performance under nonlinear loads Slamet Nurhadi; Chandra Wiharya; Satria Luthfi Hermawan; Priya Surya Harijanto; Bakti Indra Kurniawan; Divac Nabiel Akbar
JURNAL ELTEK Vol. 24 No. 2 (2026): October 2026
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/eltek.v24i2.10746

Abstract

Single-phase E-I transformers are widely used in power-conversion applications, including grid-connected flyback micro-inverters for solar photovoltaic systems, yet their performance often deteriorates due to high core loss and harmonic distortion generated by nonlinear loads. This study evaluated the effect of the annealing process on core loss, voltage regulation, energy efficiency, and voltage/current harmonic distortion of a single-phase E-I transformer under nonlinear loading. Three transformer samples were tested under no-load and nonlinear-load conditions (rectifier and inverter) before and after annealing at 180, 350, and 450 °C for 60 minutes, followed by harmonic-distortion measurement using a power logger on a flexible conveyor system and a single-phase induction motor. Annealing at 350 °C produced the most significant core-loss reduction, from 150.3 W to 110.6 W, while linear-load efficiency reached 97-98% and voltage regulation remained stable near 98%. Harmonic measurements showed voltage total harmonic distortion (THDv) of 5.8% on the flexible conveyor system and 5.6% on the induction motor without a variable speed drive, both below the 8% IEEE 519 limit, while individual current harmonic distortion (IHDi), current total harmonic distortion (THDi), and total demand distortion (TDD) also remained within the standard's safe margins. These findings indicate that medium-temperature annealing can improve the magnetic performance of the transformer core while keeping power quality within standard limits under nonlinear loading. The practical implication is that this annealing guideline can be adopted by small and medium-scale transformer manufacturers to improve energy efficiency without costly equipment investment.
Co-Authors Ahmad Hermawan Bakti Indra Kurniawan Chandra Wiharya Divac Nabiel Akbar Galih Hardika Sakti Nurhadi - Priya Surya Harijanto Ronilaya, Ferdian