This paper presents a comparative analysis of three induction motor starting methods—Direct-On-Line (DOL), Soft Starter, and Star-Delta—applied to a water pumping system in Jado, Libya. The system has experienced operational challenges, including high inrush currents, voltage dips, and frequent equipment failures. Simulation models were developed using NEPLAN software to evaluate the dynamic performance of each starting technique, focusing on starting current, and voltage stability. Load flow analysis and optimal pump separation configurations were also investigated. The results demonstrate that while DOL is cost-effective, it causes significant voltage drops, whereas Star-Delta reduces inrush current but introduces transient disturbances. The Soft Starter emerged as the most efficient solution, offering smooth acceleration and minimal electrical stress. Practical recommendations are provided to enhance system reliability and reduce maintenance costs. Keywords: Induction motors, motor starting methods, DOL, Soft Starter, Star-Delta, voltage stability, NEPLAN simulation
Shamekh et al. (Tue,) studied this question.
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