Exam 20: Wye-Delta Starting, Part Winding Starters

The thermal capacity of the stator windings greatly expands the length of starting time for a part winding motor.

If the motor is to be operated on the higher voltage, the stator leads will be connected in ____________________.

One advantage of part winding starters is that they provide ____ starting.

Part winding starting reduces the normal locked rotor current to approximately ____ percent of the value if both windings are connected during starting and the torque is reduced to approximately 50%.

What are some typical part winding applications?

What is open transition starting and how does it differ from closed transition starting?

Part winding starting is another method of increasing the starting current of squirrel-cage induction motors.

As a general rule, a time delay of two to three seconds is common before the second winding is connected in ____________________ with the first.

Wye-delta starting is accomplished by connecting the motor stator windings in wye, or star, during the starting period and then reconnecting them in delta during the run period.