International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 13 Issue: 02 | Feb 2026
p-ISSN: 2395-0072
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WIRELESS 3 PHASE STAR TO DELTA AND DELTA TO STAR CONVERSIOY USING CONTACTOR AND MOBILE APPLICATION Jadhav Prerna , Naragude Nisha , Rajegore sanika , Bokare Vaishnavi Jadhav Prerna Parmeshwar Diploma in Electrical Engineering Government Polytechnic Nanded Maharashtra, Naragude Nisha Dnyanoba Diploma in Electrical Engineering Government Polytechnic Nanded Maharashtra, P. S. Linge Professor, Department of Electrical Engineering Government Polytechnic Nanded Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract – Three-phase induction motors are extensively
inconvenient and unsafe in many industrial Environments. With recent advancements in wireless Communication and mobile technologies, motor control can Now be performed remotely, providing flexibility, safety, and Realtime monitoring. This project proposes a wireless 3-phase Star-delta and delta-star conversion system using contactors Controlled through a mobile application. The system enables Remote operation, reduces human effort, improves operational Safety, and ensures efficient and reliable motor performance, offering a modern and costeffective solution for industrial Motor control.
Used in industrial and commercial applications due to their Robustness, high efficiency, and low maintenance Requirements. However, high inrush current during startup Remains a significant challenge, causing mechanical stress The motor and electrical disturbances in the supply network. Conventional methods, such as manual or timer-based Star delta starters, have been widely implemented to mitigate Starting current, but they suffer from limitations including Lack of real-time control, inflexibility, and increased Dependence on human intervention. Previous research has Explored advanced methods such as soft starters and Programmable logic controllers (PLCs) for better motor Control, but these solutions often involve higher cost and Complexity. This paper proposes a wireless 3-phase stardelta and delta-star conversion system using contactors controlled Via a mobile application. The proposed system enables Remote operation, real-time monitoring, and enhanced Safety by minimizing manual interaction. Additionally, it Provides reliable motor control, reduces energy loss during Startup, and offers a cost-effective alternative to Conventional and automated solutions. Experimental results Demonstrate the system’s effectiveness in reducing starting Current, improving operational flexibility, and facilitating User-friendly control, making it suitable for modern Industrial automation applications.
2. Literature Review: Several researchers have studied motor Starting techniques And automation Methods: conventional manual star-delta Starters are simple but prone to human error and unsafe Operation. Automatic star-delta starters using timers reduce human Intervention but lack flexibility and monitoring.PLC-based Motor control systems Provide accurate control but are costly and complex for small industries. Recent studies show that Wireless Technologies such as Bluetooth, GSM and Wi-Fi are increasingly used for motor control and monitoring using Mobile applications. However, most existing systems do not focus on wireless Bidirectional conversion between star and delta using Contactors. Therefore, a need exists for a low-cost, simple, and wireless-controlled star-delta system.
1.1Manual Star-Delta Starters:
Key Words: Three-phase induction motor, Star-Delta starter, Contactor, Wireless control, Mobile application
Manual star-delta starters are among the earliest and simplest Techniques for reducing the high starting current of induction Motors. In this method, the motor initially starts in a star (Y) Configuration, which reduces the voltage applied to each Phase to 1/√3 of the line voltage, thus limiting the starting Current to approximately onethird of the direct-on-line (DOL) value. After a certain period, the connection is manually changed to delta (Δ) for normal operation, allowing. The motor to run at full line voltage. While cost-effective, this Method is prone to human error, timing mistakes, and unsafe operation, especially in industrial environments with large Motors. Improper switching can cause mechanical stress, Overheating, or even motor failure.
1. INTRODUCTION Three-phase induction motors are widely used in industries Due to their simple construction, high reliability, and low Maintenance requirements. However, starting these motors Directly using Direct-On-Line (DOL) methods generates high Inrush currents, which can damage motor windings, reduce the Lifespan of connected equipment, and cause electrical Disturbances. To address this issue, star-delta starters are commonly employed to limit the starting current. Traditional Star-delta starters are either manual or time-based, requiring Operators to be physically present near the motor panel, which Can be
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