The starter recommended for a 20 hp squirrel cage induction motor is:a)Star delta starterb)Face plate starterc)Direct one line starterd)Auto transformer starterCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Starter for 20 HP Squirrel Cage Induction Motor

The recommended starter for a 20 HP squirrel cage induction motor is the auto transformer starter. The following points explain why:

What is an Auto Transformer Starter?

An auto transformer starter is a type of starter that uses a single winding auto transformer to reduce the voltage applied to the motor during starting. This type of starter is commonly used for squirrel cage induction motors.

Advantages of Auto Transformer Starter

The advantages of using an auto transformer starter for a 20 HP squirrel cage induction motor are:

1. Reduced Starting Current

The auto transformer starter reduces the starting current of the motor, which is important for preventing damage to the motor and reducing the stress on the electrical system.

2. Smooth Starting

The auto transformer starter provides a smooth starting current to the motor, which is important for preventing the motor from jerking or stalling during starting.

3. Cost Effective

The auto transformer starter is a cost-effective solution for starting a 20 HP squirrel cage induction motor, as it does not require expensive components or complex wiring.

4. Easy to Install

The auto transformer starter is easy to install and maintain, which makes it a popular choice for small to medium-sized motors.

Conclusion

In conclusion, the auto transformer starter is the recommended starter for a 20 HP squirrel cage induction motor due to its reduced starting current, smooth starting, cost-effectiveness, and ease of installation.

Answer

The direct on line (DOL) starter method of an induction motor is simple and economical. In this method, the starter is connected directly to supply voltage. By this method, small motors up to 5 HP rating are started to avoid the supply voltage fluctuation.

The star-delta starter method of starting three-phase induction motors is very common and widely used among all the methods. In this method, the motor runs at delta connected stator windings. It is also used for motors of 5-15 HP rating.

The Autotransformer is used in both the type of the connections, i.e., either star connected or delta connected. The autotransformer is used to limit the starting current of the induction motor. This method is used for the high rating of squirrel cage induction motors. So, this method is most suitable for motors having ratings of more than 15 HP.

Similar Electrical Engineering (EE) Doubts

A squirrel cage type induction motor when started by means of a Y/ starter takes 150% of full load line current and develops 45% of full load torque at starting. If an auto transformer is employed with 75% tapping, the starting torque developed by the motor is ____

Name the starter which is very common and is used for cage motor design to run normally on delta connected stator winding.

A 3-phase squirrel-cage induction motor is started by means of a star/delta switch. What is the starting current of the motor

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