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All Journal Jurnal Rekayasa Mesin Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC)
Andriyatna Agung Kurniawan
Tidar University
Aerospace Engineering Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering

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Voltage Drop and Power Loss Mitigation on SGN-14 via SGN-15 Feeder Design in Distribution System ULP Magelang Haqrodji Prabu Yasya; Deria Pravitasari; Agung Trihasto; Andriyatna Agung Kurniawan
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 1 (2026): February
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i1.3686

Abstract

Feeder SGN-14 of PT PLN (Persero) ULP Magelang operates under overload conditions, significantly degrading voltage quality and increasing technical losses. PLN (Perusahaan Listrik Negara) is Indonesia’s State Electricity Company, while ULP (Unit Layanan Pelanggan) refers to a customer service unit. This study designs Feeder SGN-15 as a 20 kV load-splitting feeder supplied from Sanggrahan Substation and terminating near KH. Maksum Street (Tempuran). The feeder is 20.7 km long and routed close to the load centre to reduce line losses. Network performance is assessed using ETAP load-flow simulations and independent GNU Octave calculations of voltage profile, current, and power/energy losses, referenced to SPLN T6.001:2013 with a 10% voltage-drop limit. The proposed feeder uses 8,152 m of insulated MVTIC and 12,584 m of AAAC conductors, supported by 238 concrete poles, together with required switching devices, line accessories, and four CSP transformers. After reconfiguration, the maximum voltage drops on SGN-14 decreases from 12.82% to 6.5%, while SGN-15 operates at about 4.95%, ensuring all buses comply with SPLN T6.001:2013. Technical losses on SGN-14 fall from 388.711 to 112.337 (W/kWh), and SGN-15 contributes 81.130 (W/kWh), giving total post-reconfiguration losses of 195.467 (W/kWh). The reduction in energy-loss cost yields an estimated saving of Rp228.82 million per month, lowering losses from Rp460.32 million/month to Rp231.44 million/month. Unlike studies that optimize only switch states or voltage-regulator placement, this work shows that adding a new 20 kV feeder can jointly improve voltages, reduce losses, and deliver tangible benefits for the distribution utility.
Numerical Study of Savonius Wind Turbine Performance at Tidar University under Wind Speed and Direction Angle Using the CFD Method Ahmad Izzudin Robani; Nurmala Dyah Fajarningrum; Raka Mahendra Sulistiyo; Fuad Hilmy; Andriyatna Agung Kurniawan
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7146

Abstract

The savonius wind turbine is a type of vertical axis wind turbine (VAWT) that operates based on the drag force principle. Its simple design, featuring S-shaped blades arranged around a vertical shaft, enables the turbine to capture wind from any direction and operate effectively at low wind speeds, making it suitable for residential areas. This study investigates the performance of a three-bladed helical Savonius turbine with a 180° twist angle under variations in wind speed and wind direction. Numerical simulations were conducted using Computational Fluid Dynamics (CFD). Wind speed data were obtained from rooftop measurements at the Faculty of Economics, Tidar University, recorded at 08:00, 10:00, 12:00, 14:00, and 16:00, with average values of 1.9 m/s, 2.0 m/s, 2.2 m/s, 2.2 m/s, and 2.0 m/s, respectively. The analyzed wind direction angles were 15 , 25 , and 35 . Results show that a 15  wind direction produced the most stable and optimal performance, achieving a turbine power ( ) of 0.0356 W, a power coefficient (Cp) of 0.0931, and a TSR of 0.525. This occurred because the airflow aligned more effectively with the rotor, improving kinetic energy capture, reducing drag flow on the convex returning blade, and minimizing vortex formation and negative torque. Peak performance occurred at 12:00 and 14:00 when wind speeds exceeded 2.0 m/s. However, the power coefficient showed a decreasing trend due to the presence of adverse flow phenomena that reduce the amount of wind energy converted by the turbine.
Co-Authors Agung Trihasto Ahmad Izzudin Robani Deria Pravitasari Fuad Hilmy Haqrodji Prabu Yasya Nurmala Dyah Fajarningrum Raka Mahendra Sulistiyo