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All Journal INFOKUM Jurnal Info Sains : Informatika dan Sains
Siti Anisah
Universitas Pembangunan Panca Budi, Medan, North Sumatera, Indonesia
Computer Science & IT

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Impact of Stator Resistance Unbalance on the Efficiency and Torque of Three-Phase Induction Motor Muhamad Vickry Almuhtadi Billah; Siti Anisah; Parlin Siagian
INFOKUM Vol. 14 No. 03 (2026): Infokum, May - June 2026
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58471/infokum.v14i03.3090

Abstract

Three-phase induction motors are key components in industrial power systems, but their performance is susceptible to internal disturbances such as stator resistance imbalance caused by aging, overheating, or manufacturing defects. This study aims to systematically analyze the impact of stator resistance imbalance on the efficiency and torque characteristics of squirrel cage rotor induction motors using equivalent circuit-based mathematical modeling. Unlike previous studies that used external resistors, this study modifies the stator resistance parameters directly in the model to represent more realistic internal degradation. Simulations were performed on a 3.73 kW, 400 V, 50 Hz motor with resistance imbalance variations from 0% to 20%. The results show that the imbalance causes uneven current distribution and an increase in stator copper losses of up to 5.94% at 20% conditions, although the percentage of current imbalance remains below 1%. As a result, the efficiency decreases linearly from 92.97% to 92.62%, while the mechanical torque experiences a small decrease from 95.88 Nm to 95.28 Nm. This phenomenon also has the potential to increase torque ripple and uneven heating. This study demonstrates that stator resistance imbalance, even small ones, has a significant impact on motor performance and lifespan, and therefore needs to be considered in predictive maintenance strategies and energy efficiency optimization.
Monitoring Electrical Charge Overflow During Voltage Conditions as a Preventive Measure for Preventing Disturbances in 20kv Feeder at PT PLN (Persero) ULTG Nias Roy Christian Siregar; Hamdani Hamdani; Siti Anisah
INFOKUM Vol. 14 No. 04 (2026): Infokum 2026
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58471/infokum.v14i94.3136

Abstract

The reliability of 20 kV feeders is greatly influenced by the condition of the equipment and the insulation system that operates continuously. One of the causes of disturbances in the distribution network is the occurrence of electrical overflow (partial discharge) which can develop into equipment damage if not detected early. This study aims to analyze the application of electrical overflow monitoring during voltage conditions as a preventive measure to prevent disturbances in 20 kV feeders at PT PLN (Persero) ULTG Nias. The research method was carried out through online partial discharge measurements using the Ultra TEV Plus 2 tool in the GB2, GB3, and GB4 feeder cubicles without performing a system shutdown. The data obtained were analyzed based on the parameters of Transient Earth Voltage (TEV), Pulse Per Cycle (PPC), and ultrasonic measurements to determine the level of potential disturbances in the equipment. The measurement results showed that the GB2 and GB3 feeders had a TEV value of 5 dB with a PPC of 0 so that they were included in the normal category and did not show any indication of partial discharge activity. Meanwhile, on the GB4 feeder, a TEV value of 20 dB with a PPC of 1.83 was obtained, and a hissing sound was detected in ultrasonic measurements, indicating the presence of medium-level partial discharge activity due to a decrease in insulation quality. The results of the study prove that monitoring electrical discharge overflows under voltage conditions can identify potential disturbances early so that maintenance actions can be carried out appropriately and planned to improve feeder reliability and maintain the continuity of electricity distribution.
Safety Analysis of the Grounding System at the 150 kV Simpang Haru Substation Using the Grid Grounding System Method Based on the IEEE Std 80 Standard Danil Danil; Hamdani Hamdani; Siti Anisah
INFOKUM Vol. 14 No. 04 (2026): Infokum 2026
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58471/infokum.v14i94.3137

Abstract

The grounding system at the substation is an important part of the electric power system that functions to maintain the safety of humans and equipment against ground fault currents. A grounding system that does not meet standards can cause touch voltages and step voltages that are dangerous for personnel and electrical equipment. This study aims to analyze the safety of the grounding system at the 150 kV Simpang Haru Substation using the Grid Grounding System method based on the SPLN and IEEE Std 80 standards. The analysis was carried out by calculating the grounding grid resistance value, Ground Potential Rise (GPR), touch voltage, and step voltage. The research data were obtained from the technical data of the substation grounding system including soil resistivity, grounding grid area, conductor length, and single-phase ground fault current. The results showed that the grounding resistance value of 0.49 Ω still meets the SPLN standard, which is below 1 Ω. The Ground Potential Rise value obtained was 5.88 kV. The touch voltage of 96 Volts and the step voltage of 36 Volts are still below the IEEE Std 80 safety limits of 638 Volts and 2,204 Volts, respectively. Based on the results of the analysis, the grounding system at the Simpang Haru 150 kV Substation is declared safe and meets safety standards based on SPLN and IEEE Std 80.
Co-Authors Bella Rosmaida S Danil Danil Hamdani Hamdani Muhamad Vickry Almuhtadi Billah Parlin Siagian Roy Christian Siregar