Name two requirements that must be met before a motor can be used for wye–delta starting.

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Answer 1

Textbook Question

Chapter 39, Problem 1RQ

Name two requirements that must be met before a motor can be used for wye–delta starting.

Expert Solution & Answer

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

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A 50 Hz pump drive requires a torque of 70 Nm approx. at 1450 rpm approx. for 1 minute followed by 5 minutes running unloaded. This cyclic pattern is repeated continuously. The motor is to be selected from a range of general-purpose motors with continuous ratings of 2.2, 3, 4, 5.5, 7.5, 11, 15 and 20 kW. The motors have a pull-out torque of 200%. 1. Select the pole number. 2. Calculate the continuous power rating. 3. 4. Calculate the required power rating given the pull out torque rating. Estimate the slip when the motor drives the pump at the required speed. Choose the motor from the range of options that is most fit for purpose. 5. Enter your answers in the units indicated (without unit symbols) corrected if necessary to two decimal places. Answer: Number of poles= ✓ Continuous power rating (kW)= Required power rating for 200% pull out torque (kW)= Percentage slip (%) = Most suitable motor from given range (kW)-

State four advantages of a pre-engaged starter when compared with an inertia type.

Answer 2

Textbook Question

Chapter 39, Problem 1RQ

Name two requirements that must be met before a motor can be used for wye–delta starting.

Expert Solution & Answer

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

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Answer 3

Textbook Question

Chapter 39, Problem 1RQ

Name two requirements that must be met before a motor can be used for wye–delta starting.

Expert Solution & Answer

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

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Answer 4

Textbook Question

Chapter 39, Problem 1RQ

Name two requirements that must be met before a motor can be used for wye–delta starting.

Expert Solution & Answer

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

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Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

Answer 8

Expert Solution & Answer

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

To determine

The requirements that must be met before the motor is used for the wye delta starting.

Answer 12

Explanation of Solution

Consider that delta starting is often used to reduce the inrush current in to the motor and at the starting to reduce the starting torque.

Consider the requirement for the motor to be used for the wye delta starting is,

The motor designed for the stator winding must be in delta during the running period.

The leads of the stator winding should be accessible.

Therefore, the requirements of the motor to start by the use of the wye delta starting is discussed.

Answer 13

Ch. 39 - Name two requirements that must be met before a...Ch. 39 - Prob. 2RQ Ch. 39 - Prob. 3RQ Ch. 39 - Refer to the circuit shown in Figure 399. Assume...Ch. 39 - Refer to the circuit shown in Figure 39–9. Assume...Ch. 39 - Prob. 6RQ Ch. 39 - The motor nameplate of a wye–delta starter motor...Ch. 39 - Prob. 8RQ Ch. 39 - Refer to the circuit shown in Figure 3914. What is...Ch. 39 - Refer to the circuit shown in Figure 39–14. When...

Name two requirements that must be met before a motor can be used for wye–delta starting.

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