STAR-DELTA MOTOR CONNECTION PROJECT

Client/Industry: M. Power Engineering
Duration: Part of 3-Year Industrial Maintenance & Control Projects
Category: Motor Control & Industrial Automation

🔹 Project Overview

As part of my work with M. Power Engineering, I successfully implemented Star-Delta Motor Control Circuits for large induction motors. This system is used to reduce the high inrush current during motor starting, protecting both the motor and the electrical network.

The project involved designing, wiring, and testing the star-delta starter both in manual and automatic mode, ensuring safe and reliable motor operation.

🔹 Objectives

Design and implement a star-delta motor starter connection.
Reduce starting current while maintaining sufficient torque.
Integrate protection devices (MCB, overload relay, fuses).
Ensure safe operation through push buttons and indicators.
Deliver a neat, professional control panel setup for industrial use.

🔹 Scope of Work & Responsibilities

1. Circuit Design & Planning

Prepared power and control circuit diagrams.
Selected proper rating contactors, overload relays, and timers.
Ensured compatibility with motor specifications (voltage, HP, current).

2. Panel Assembly & Wiring

Installed three contactors (Main, Star, Delta) on DIN rail.
Wired power circuit for star and delta connection.
Connected control circuit with timer, push buttons, and interlocks.
Added indication lamps (ON, Star, Delta) for status monitoring.

3. Testing & Troubleshooting

Verified proper sequence: Start → Star Mode → Timed Changeover → Delta Mode.
Checked overload relay trip settings for motor protection.
Troubleshot wiring and timing issues during initial tests.

4. Safety & Documentation

Implemented proper earthing and insulation.
Created detailed wiring diagrams and documentation for future maintenance.

🔹 Key Features

✅ Smooth motor starting with reduced inrush current.
✅ Automatic star-to-delta transition using timer.
✅ Push button controls with interlocking for safety.
✅ Overload relay protection to prevent motor damage.
✅ Status indicators for clear operator guidance.

🔹 Achievements

Successfully completed star-delta connections for multiple industrial motors.
Ensured long-term reliability and safety of motor operations.
Strengthened expertise in motor control systems and automation.

🔹 Skills Demonstrated

3-Phase Motor Control Systems
Star-Delta Starter Wiring
Electrical Panel Assembly
Control Circuit Design & Testing
Troubleshooting & Protection Systems

✅ This project demonstrates my practical ability to design, assemble, and commission advanced motor control systems used in industrial operations.