The star-delta wiring is an electrical circuit used in the motor power control in a three-phase power supply connection. This type of wiring connection helps in reduces the initialize high voltage in the motor windings, which helps reduce the high starting current in the starting of the three-phase induction motor. In having all including the star delta starter control diagram
What is Star-Delta wiring?
The star delta wiring connection is three phases in the Y connection (Star Connection). And then the same connection in the Delta connection wiring on another side also Δ (Delta connected wiring). The combined connection of these wiring is called the star delta wiring connection. This type of wiring connection helps in reduces the initialize high voltage in the motor windings
The Star connection is one end connected to each other with them and another end of the windings connected to the separate three-phase power supply sources. Each winding has its own phases, with neutral wiring connected in the center of the three-phase wiring connection for safety purposes.
The Delta connection wiring is one end is connected to the other phase windings to make a circular loop-type design pattern. To design like a triangle or Delta shape.
Working of the star-delta wirings
The switch or contactor is used for switching the three-phase windings connection. Initially, the condition is during the motor starting windings connected in the star-connected windings. Which reduces the starting applied voltages on the windings. The reduced voltages also reduce the starting current flows inside the windings and reduce the starting torque of the motors. which prevents the heating or burnout of the motors.
Star Delta Windings
In an AC power system, three phase power supply is not the same as line to line or line to phase or phase-to-phase connections.
The lines-to-line current is the square root 3 times the phase current.
IL = √3 x IP
IL = Line-to-line current.
IP = Phase Current
It is only applicable to the sinusoidal three-phase power supply only.
Note:- The several advantages of using star-delta windings. Firstly it reduces the starting torque is also reduces the size and cost of the cables, and switchgear needs to connect the power supply.
The star delta starter control diagram
Application of the star delta windings.
- Pumps:-Mostly, the industrial sector uses pumps in oil, mining, and gas operations, which require high-power and high-torque motors and consume a lot of power.
- Fan and blower:- High power consumption fan and blower used in the HVAC, Food industries, chemical and automobile industries, etc. These applications required high starting torque in the operation. So starting delta help in reduces the high starting current in the motor to prevent heating or burnout.
- Compressors:- Air compressors used in industrial applications such as manufacturing and construction motor require high starting torque.
- Conveyors belt:- Conveyor belts are used in the industry for food processing, wiring, packaging, etc. The star delta configures the start of the motor in a safe and efficient method to reduce the current high starting current and voltages.
Advantages of the Star delta connections
- Reduce starting current:- It helps in reducing the starting current in the motor circuits. Which is prevent the motor from electrical threats and also tripping the circuits.
- Reduce starting torque:-The star delta connection reduces the starting torque of the electrical motor, which is necessary for a soft start in high starting torque applications like fans or compressors.
- Improved power efficiency:- The reduced voltage and current in the starting phase of the motor result in reduced power losses. That also helps in improving the power efficiency in the starting phase of the motor.
- Reliable operation:- The star delta method operation ensures the reliable method of starting the motor. The industrial application of motor starting mostly uses this method. Click here for more information about motors electrical-motor-diagram
Frequently asked question (FAQ)
- what is the star delta connection?
It ensures the reliable operation of the three-phase induction motor. by just reducing the starting current and torque in the motor.
2. How does a star-delta connection reduce starting current and torque in the motor?
In star delta connection firstly connected in a star-connected winding that helps in reducing the voltage in the square root three times with corresponding reduce voltage also reduces the starting current and voltage in the motor.
3. Are there any disadvantages of the star delta connection?
Using the star delta motor starter ensures safe and reliable operation of the induction motor. It also increases the capital required cost of the system.
You can also follow on LinkedIn
I am a highly motivated and skilled individual with a passion for Electrical engineering. I have 1 year of experience in Robotics and Electrical engineering, which has allowed me to develop a strong set of skills in PLC, Painting Robots, SCADA. I am a quick learner and am always looking for new challenges and opportunities to expand my knowledge and skills. I am a team player and enjoy working with others to achieve a common goal. Successfully completed many projects for a various clients in the automobile sector.
Thank You