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FULL VOLTAGE STARTING FOR A SQUIRREL CAGE INDUCTION MOTOR
Introduction
Induction motors can be started easily unlike synchronous motors. Small induction motors can be
started by connecting them to power directly, a method also known as across-the-line starter
method. However, this method is not preferable for large motors because of the large current
required during starting that cause a dip of voltage in the power line. This is unacceptable in
many cases.
Current varies widely during starting of cage induction motors. This variation depends primarily
on the rated power and the rotor’s resistance during starting. Cage motors have code letters on
their nameplates that help in estimating the starting current (Chapman, 2005).
Objectives
I.
To understand the working principle of full voltage starting of a squirrel cage induction
motor.
II.
III.
To observe the drop in voltage during the starting of squirrel cage motor.
To determine speed variation during starting and normal running of the motor.
Procedure
1. Connections were made as shown in Diagram No. 1 below.
Diagram No. 1
2. The main circuit breaker was then turned on to supply a 208 V-3 phase voltage to the
circuit.
3. The N.O. start pushbutton was depressed causing coil F to be ...