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

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Analysis of the Effect of Load Equalization On Neutral Current at the TP0067 Distribution Substation of PT PLN (Persero) ULP Tanjung Pandan Bella Rosmaida S; Hamdani Hamdani; Siti Anisah
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Abstract

Transformer load balancing is a mandatory maintenance activity that is regularly conducted to ensure the optimal performance of distribution systems. This activity serves as an essential effort to minimize neutral current, which contributes to power losses resulting from unbalanced loading conditions in distribution transformers. The load balancing process was carried out at Distribution Substation TP0067, with a capacity of 100 kVA, located within the operational area of ​​PT PLN (Persero) ULP Tanjung Pandan. The procedure commenced with load measurements on each feeder and phase, followed by detailed calculations of the phase load distribution. Based on the analysis results, the phases requiring load transfer to achieve balance were identified. Following the implementation of the load redistribution plan, it is expected that the neutral current will be significantly reduced, thereby reducing power losses and enhancing the overall efficiency and reliability of the distribution system.
Impact of Stator Resistance Unbalance on the Efficiency and Torque of Three-Phase Induction Motor Muhamad Vickry Almuhtadi Billah; Siti Anisah; Parlin Siagian
Jurnal Info Sains : Informatika dan Sains Vol. 16 No. 02 (2026): Info sains, 2026
Publisher : SEAN Institute

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Three-phase induction motors are the main components in industrial power systems; However, their performance is vulnerable to internal disturbances such as stator resistance imbalance caused by aging, overheating, or manufacturing defects. This study aims to regularly analyze the impact of stator resistance imbalance on the efficiency and torque characteristics of a squirrel-cage induction motor using mathematical modeling based on an equivalent circuit. Unlike previous studies that employed external resistors, this research directly modifies the stator resistance parameters in the model to represent more realistic internal degradation. Simulations were conducted on a 3.73 kW, 400 V, 50 Hz motor with stator resistance imbalance variations ranging 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 the 20% imbalance condition, although the current imbalance percentage remains below 1%. As a result, the efficiency decreases linearly from 92.97% to 92.62%, while the mechanical torque experiences a slight reduction from 95.88 Nm to 95.28 Nm. This phenomenon also has the potential to increase torque ripple and uneven heating. The study demonstrates that even small stator resistance imbalances have a significant impact on motor performance and lifespan, and therefore should be considered in predictive maintenance strategies and energy efficiency optimization.
Co-Authors Bella Rosmaida S Hamdani Hamdani Muhamad Vickry Almuhtadi Billah Parlin Siagian