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All Journal Jurnal Teknik Kimia USU Jurnal Pengabdian Mandiri ELPOSYS: Jurnal Sistem Kelistrikan Serambi Engineering
Muhammad Fahmi Hakim
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Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Social Sciences Other

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Evaluasi Operasional Pemutus Tenaga Gas SF6 di Gardu Induk 150 kV Rachmat Sutjipto; Heri Sungkowo; Muhammad Khairan; Slamet Nurhadi; Muhammad Fahmi Hakim
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 1 (2025): ELPOSYS vol. 12 no. 1 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i1.6847

Abstract

Circuit Breaker (CB) is a critical component in high-voltage substations that functions to switch and disconnect electrical currents under normal and fault conditions. Over time, operational aging and environmental factors may degrade the performance of CB, potentially impacting power system reliability. This study aimed to evaluate the feasibility of 150 kV CB at Probolinggo Substation, particularly in Transformer Bay 1 and Transformer Bay 3, through a comparative analysis of insulation resistance, contact resistance, contact simultaneity, and SF6 gas purity based on tests conducted in 2021 and 2023. The study employed experimental methods and standard-based evaluations, referring to VDE (Catalogue 228/4), IEC 60694, SKDIR-0520/2014, and CIGRE standards. The findings revealed that although insulation resistance values showed slight degradation in 2023, they remained above the minimum threshold, ensuring safe operation. Contact resistance increased marginally due to dust accumulation and aging but still met the IEC 60694 standard. Contact simultaneity remained well within SKDIR-0520/2014 limits, indicating proper switching operation. SF6 gas purity tests showed a minor increase in moisture content due to condensation, yet all parameters complied with CIGRE standards. These results align with previous studies that highlight CB degradation over time but confirm that regular maintenance can sustain its operational reliability. This research underscores the importance of periodic monitoring and predictive maintenance strategies. Future work should explore real-time IoT-based monitoring and numerical simulations to enhance failure prediction models and optimize maintenance strategies for high-voltage circuit breakers.
Pengaruh Konsentrasi Methylene Blue dan NaClO pada Proses Degradasi Photocatalytic Fuel Cell Menggunakan Elektroda Cu-TiO2/ZnO Putri Meylani, Cicilia; Sarah Dampang; Muhammad Fahmi Hakim; Fitri Yuliasari; David Kevin; Tarishah Setyowati Putri
Jurnal Teknik Kimia USU Vol. 14 No. 2 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i2.20525

Abstract

The contamination of synthetic dyes such as methylene blue has become a serious issue in textile industry wastewater due to its resistance to natural degradation. Photocatalytic Fuel Cell (PFC) technology is an effective and environmentally friendly method for degrading toxic dyes in wastewater. In this study, a dual-chamber PFC was developed using a photoanode composed of a Cu-TiO₂/ZnO semiconductor composite synthesized via the sol-gel method. The objective was to develop an efficient composite electrode and evaluate the effect of methylene blue and sodium hypochlorite (NaClO) concentrations on degradation efficiency. The composite was prepared with 5 wt% Cu, calcined at 200 °C, and deposited onto a glass substrate. Characterization using Scanning Electron Microscopy (SEM) revealed that the resulting nanoparticles exhibited a spherical morphology with diameters ranging from 0.22 µm to 4.33 µm. UV-Vis Diffuse Reflectance Spectroscopy (DRS) analysis showed that the band gap energy decreased from 3.18 eV (TiO₂/ZnO) to 2.29 eV after Cu doping. The experimental results demonstrated that the addition of NaClO enhanced the photocatalytic activity of the Cu-TiO₂/ZnO composite for methylene blue degradation, achieving an optimal degradation rate of 78% after 120 minutes of operation.
Kapasitor Shunt Sebagai Korektor Tegangan Bus di Gardu Induk Muhammad Fahmi Hakim; Slamet Nurhadi; Hanifiyah Darna Fidya Amaral; Diktiaz, Aggahra; Amimah, Anggi; Satria Luthfi Hermawan
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 1 (2023): ELPOSYS vol.10 no.1 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (732.277 KB) | DOI: 10.33795/elposys.v10i1.915

Abstract

Segoromadu Substation has two busbars, namely busbar A and busbar B. Busbar A which has nominal voltage of 150 kV has reached a voltage value of 129.38 kV or experienced voltage drop of 13.75%. The percentage of this voltage drop exceeds a predetermined standard. Therefore, it is necessary to design a shunt capacitor which is then modeled and simulated. Based on calculation and analysis result, capacity of shunt capacitor that should be installed on Bus A is 50 MVAR. After the shunt capacitor was installed, based on simulation, there was an increase of 4.87 kV so the voltage afterward became 139.67 kV or only experienced a voltage drop of 3.19%. So, by installing a shunt capacitor with capacity of 50 MVAR, it can increase busbar voltage of the substation. The shunt capacitor also increases the value of reactive power and current flowing to the busbar.
Pengaruh Variasi Elektrolit (NaCl dan N2SO4) Untuk Meningkatkan Kinerja Komposit 5%Cu-TiO2/BiVO4 Dalam Fotoelektrokimia Water Splitting Nurhayati, Siti; Vera Pangni Vahriani; Sarah Dampang; Muhammad Fahmi Hakim; Bunga Nurkhalifah
Jurnal Serambi Engineering Vol. 10 No. 4 (2025): Oktober 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The demand for environmentally friendly energy sources has encouraged the use of photoelectrochemical (PEC) technology to produce hydrogen from water. This study aims to evaluate the performance of a 5% Cu–TiO₂/BiVO₄ composite material. The main focus is to examine the effect of two types of neutral electrolytes, NaCl and Na₂SO₄, on the performance of a single-compartment PEC system. Based on characterization results using SEM-EDS and UV-Vis DRS, copper (Cu) doping successfully reduced the material's band gap to 2.02 eV and improved charge separation efficiency. System testing showed that the NaCl solution produced the highest initial voltage of 0.73 V and exhibited relatively stable performance, although it posed a potential risk of electrode corrosion. In contrast, Na₂SO₄ produced a lower voltage (0.66 V) but was more chemically stable and safer for long-term use. The results indicate that combining Cu–TiO₂/BiVO₄ material with appropriate electrolyte selection can be an effective strategy to improve the efficiency of PEC systems for hydrogen generation from light.
Co-Authors Ahmad Hermawan Ahmad Jamaruddin Amaral, Hanifiyah Darna Fidya Amimah, Anggi Ananto, Rhezal Agung Bakti Indra Kurniawan Budi Eko Prasetyo Bunga Nurkhalifah Bustani Hadi Wijaya David Kevin Diktiaz, Aggahra Dinda Ayu Amalia FANDI KURNIAWAN Fitri Yuliasari Galuh Prawestri Citra Handani Habib Priyo Budianto Helmy Mukti Himawan, Helmy Mukti Imron Ridzki Kumala Mahda Habsari Mohammad Noor Hidayat Muhammad Khairan Muhammad Ridlo Zainal Mustikasari, Vita Ria Nadhiroh, Nuha Nursal, Elan Causa Priya Surya Harijanto Putri Meylani, Cicilia Rachmat Sutjipto Rahmad Dwi Pramudya Rahman Azis Prasojo Rahman Azis Prasojo Rahmania Putri Yulissa Reyhan Aulia Rachman Rohmanita Duanaputri Ronilaya, Ferdian Sarah Dampang Satria Luthfi Hermawan Siti Nurhayati Siti Nurhayati Slamet Nurhadi Sukamdi Sungkowo, Heri Tarishah Setyowati Putri Tresna Umar Syamsuri Vera Pangni Fahriani Vera Pangni Vahriani Wijaya Kusuma Yudistiro Yanuarianto