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All Journal ELPOSYS: Jurnal Sistem Kelistrikan
Mochammad Mieftah
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Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering

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Analisis Koordinasi Relai Proteksi Transformator I 150/20kV GI Bumicokro Akibat Uprating Daya 50MVA Menjadi 60MVA Anang Dasa Novfowan; Mochammad Mieftah; Heri Sungkowo
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 2 (2023): ELPOSYS vol. 10 no. 2 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v10i2.2521

Abstract

Nowadays, Electricity is a important thing for people. As the load grown at the Bumicokro Substation, transformer I had replaced from 50 MVA to 60MVA. Because of that, the relays protection had to be resetting because of the changes of nominal current. Therefore, the objectives of this research are calculated and simulated the setting of OCR (Over Current Relay), GFR (Ground Fault Relay), SBEF (Stand by Earth Fault), differential and REF (Resistance Earth Fault) relay. ETAPv12.6 software is used to get the relay coordination Outgoing 22kV, Incoming 150kV, OCR (Over Current Relay), GFR (Ground Fault Relay), SBEF (Stand by Earth Fault), differential and REF (Resistance Earth Fault) after the calculation and simulation finished, then the result indicated the appropriate conditions to overcome the distrubance at the transformer according to the protection zone. The result of current setting for Differential relay is 2,88A, Primary REF is 0,5A, Secondary REF is 1,1A, 150kV OCR is 3,5A, and the moment setting is 28A, 22kV OCR 150kV 4,7A, GFR 1,44A, SBEF 1,0A. While, the result of time setting for Differential relay, Primary REF, Secondary REF are instant, for 150kV OCR is 1,06s, 22kV OCR is 1,07s, GFR 1,51s, and SBEF 8,8s.
Power Line Carrier (PLC) sebagai Media Pendeteksi Phasa Pelanggan Tegangan Rendah Anang Dasa Novfowan; Mochammad Mieftah; Wijaya Kusuma; Slamet Nurhadi
Elposys: Jurnal Sistem Kelistrikan Vol. 10 No. 3 (2023): ELPOSYS vol. 10 no. 3 (2023)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v10i3.4166

Abstract

With so many distribution substations and the number of household customers, most of whom are single-phase low voltage customers, customer phase verification becomes very important in the load balancing proces. The customer phase detection system that has been studied previously, using radio frequency communication media over the air, is considered less valid if used in border areas between 2 (two) distribution substations. It is felt that the low voltage customer phase detection method will be more valid if it is carried out via Power Line Carrier (PLC) media, namely data communication via electrical lines. And this system consists of two devices, namely a transmitter (called the Master) which is installed on the LV Panel and a receiver (called the Slave) which is carried by the mobile to the detected phase point Short distance phase detection using Power Line Carrie from transmitter to receiver has a 100% success rate in one sub-panel with a transfer speed of 9600 baudrate, with an average detection time for short distances of 5 seconds. For long distance detection, sometimes the detection time is relatively long (± 120 seconds) or even failed, possibly due to the quality of the connection along the conductor being detected, thus causing noise in the network.
Peningkatan Keandalan Berbasis Nilai Energy Not Supplied (ENS) Pada Penyulang Banyu Biru Slamet Nurhadi; Mochammad Mieftah; Heri Sungkowo; Sukamdi
Elposys: Jurnal Sistem Kelistrikan Vol. 11 No. 2 (2024): ELPOSYS vol. 11 no. 2 (2024)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v11i2.5157

Abstract

The reliability of the Banyu Biru feeder at PT. PLN (Persero) ULP Gondang Wetan is critical due to frequent disturbances causing significant energy losses and impacting SAIDI and SAIFI metrics. This study aims to enhance reliability by reducing ENS (Energy Not Served) values through strategic solutions. Data from March to August 2022 revealed 27 disturbances, comprising 6 permanent and 21 temporary interruptions. Initial calculations showed an ENS value of 20,509.84 kWh, a SAIDI of 0.24 hours/customer, and a SAIFI of 0.64 times/customer. The study proposed two scenarios: relocating the LBSM and adding 5 FCOs, and additionally installing a recloser in the second scenario. Post-implementation, ENS values decreased to 7,489.31 kWh, with SAIDI and SAIFI values improving to 0.08 hours/customer and 0.13 times/customer, respectively. These results highlight significant reductions in energy losses and improvements in network reliability, aligning with SPLN 68-2: 1986 standards. This research provides actionable insights for PT. PLN to enhance distribution network reliability and customer satisfaction.
Sistem Otomatis Penyimpanan Data Pendeteksi Fase Pelanggan Tegangan Rendah Anang Dasa Novfowan; Mochammad Mieftah; Slamet Nurhadi
Elposys: Jurnal Sistem Kelistrikan Vol. 11 No. 3 (2024): ELPOSYS vol. 11 no. 3 (2024)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v11i3.6251

Abstract

Inaccurate phase detection due to manual data recording often led to errors, impacting load balancing processes in electrical distribution. This research aimed to develop an automated phase detection system for low-voltage customers, utilizing a MicroSD-Card for data storage to reduce human error and enhance data reliability. The device used Power Line Carrier (PLC) communication technology integrated with customer identity (ID PEL) and employed Arduino Uno for phase data processing. The research method involved designing and testing phase detection and data storage functions across various distances to assess system accuracy. Findings indicated the system accurately detected customer phases and stored data efficiently, with minor delays only at longer distances. This automated solution effectively minimized manual errors in phase data entry. Future applications of this system could significantly improve load balancing accuracy and data management in electrical distribution networks
Optimalisasi Konfigurasi Fasa Vertikal Pada Saluran Udara Tegangan Ekstra Tinggi Ruwah Joto; Dhesah Kharisma, Dhimas; Mochammad Mieftah; Aly Imron
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.v12i1.6848

Abstract

The dangers arising from the 500 kV extra high voltage overhead lines to the surrounding environment can actually be minimized in several ways. One of the methods is to change the configuration of the conductor arrangement. Based on the laws in field theory which state that the magnitude of the field quantity on a charged conductor can differ depending on the distance, area, or volume, an analysis was carried out to understand the effect of the phase arrangement on the electric field intensity under the 500 kV overhead transmission line. The Finite Difference Method uses a numerical approximation to the partial derivative of the differential equation describing the electric field. The use of the Hybrid Tower combines vertical and horizontal designs to achieve a balance between low electric fields and land efficiency. Of the 36 combinations of phase arrangements on transmission lines with a double-circuit vertical configuration, there is a large variation in the resulting field intensity. Information on the phase arrangement that produces the smallest field intensity is very important. The arrangement of 36 (arrangement T1-S1-R1: T2-S2-R2) produces the lowest electric field intensity. Compared with the super bundle arrangement (arrangement R1-S1-T1: R2-S2-T2), there is a decrease in field intensity of up to 45.842%, while compared with the low reactance arrangement (arrangement R1-S1-T1: T2-S2-R2), there is a decrease in field intensity of up to 33.374%.
Evaluasi dan Mitigasi Distorsi Harmonisa Transformator 1250 kVA Beban Motor Pompa Air Anang Dasa Novfowan; Mochammad Mieftah; Dhimas Dhesah Kharisma
Elposys: Jurnal Sistem Kelistrikan Vol. 12 No. 2 (2025): ELPOSYS vol. 12 no. 2 (2025)
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/elposys.v12i2.7330

Abstract

As a fundamental part of modern life, electricity must be both reliable and efficient—qualities that can be affected by issues like voltage unbalance and harmonic distortion. This study investigates power quality in a 1250 kVA transformer that supplies continuous power to water pump motors at PDAM Wendit, which operate 24 hours a day. Data were collected using the Power Logic PM5100, while a passive filter design was developed and tested through simulations in Matlab/Simulink.The results show a Voltage Unbalance Factor (VUF) of 0,32%, which falls within the acceptable range according to NEMA standards. However, the Total Harmonic Distortion of Voltage (THDV) was found to be between 8% and 9,2%, exceeding the 8% limit recommended by IEEE 519-2014. The average power factor measured was 0,9. To address the excessive harmonic distortion, a single-tuned passive filter was designed targeting the dominant third-order harmonics. Simulations revealed that the filter successfully lowered the THDV to below 6% and reduced current by 1,5% to 3,4%. These findings highlight the importance of harmonic mitigation not only in meeting regulatory standards but also in improving energy efficiency, reducing power losses, and ensuring longer operational life for critical equipment like water pump motors.
Co-Authors Abd. Rasyid Syamsuri Aly Imron Anang Dasa Novfowan Dhesah Kharisma, Dhimas Dhimas Dhesah Kharisma Kharisma, Dhimas Rachmat Sutijpto Ruwah Joto Slamet Nurhadi Sukamdi Sungkowo, Heri Wijaya Kusuma