ZuoTi.Pro
Question

5. (a) State the reason(s) for using a starter to start an induction motor. b) Describe, with the aid of diagram(s), two methods for starting of a squirrel cage induction (c) The results of no-load and blocked-rotor test on a 3-phase, star-connected induction motor are as follows No-load test: Line-to-Line voltage = 380V: Input power = 1500W: Block-rotor test: Line-to-Line voltage 38V; Input power - 2.4kW Input current-15A; Friction and windage losses is 500W Input current-65A. Stator resistance between terminal 0.2Ω.

engineering   Electrical-Engineering   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

A Startex ís needed fOY a 3-9 Induction rnotox benu, at the time of Starting,Df induction motoris started drad At the time of starting slips, so γ0tDYYenStarca eill depend on sup that is Ra(-5) cil be zexo,then xotor cJill act as shost circuit, so moto doil dvou hib Cussent at staxtin methods 3 Poto

0 0
Add a comment
Know the answer?
Add Answer to:
5. (a) State the reason(s) for using a starter to start an induction motor. b) Describe,...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • 5 Marks) A 4-pole, 3 phase, 50 Hz, 230 V induction motor. Each phase of rotor winding b) has one-fourth the number of t...

    5 Marks) A 4-pole, 3 phase, 50 Hz, 230 V induction motor. Each phase of rotor winding b) has one-fourth the number of turns of each stator. The full-load speed is 1,455 rpm. The rotor resistance is 0.3 Ω and rotor standstill reactance is 1.0 Ω per phase. The rotor and stator windings are similar. Stator losses are equal to 50 Watts. Friction and windage losses are equal to 30 W. Calculate ) Blocked rotor voltage per phase. 2 Marks)...

  • 6. A 3-phase 2.2 kV 25 Hz squirrel cage induction motor draws a line current of...

    6. A 3-phase 2.2 kV 25 Hz squirrel cage induction motor draws a line current of 224 A and a total power of 777 kW when operating at full load. The full-load speed is 245 rpm. The stator is wye connected and has an effective resistance per phase of 0.125 Ω. The stator iron (core) loss is 8.88 kW; friction and windage losses are 4.54 kW. Calculate at full-load conditions: b. power supplied to the rotor, a. the power factor;...

  • Q6 A 50 hp 440 V three phase induction motor is used to determine the power...

    Q6 A 50 hp 440 V three phase induction motor is used to determine the power rating of a load. With the load connected to the motor shaft, the input power is 30.5 KW and the stator current is 34.5 A at rated voltage. The blocked rotor test on the motor yields a current of 44.3 A at 52.5 V and a power input of 2.1 kW. When running with no load at rated voltage, the motor takes 16.3 A...

  • The following test data apply to a 7.5-hp, three-phase, 220-V, 19-A, 60-Hz, four-pole induction motor with...

    The following test data apply to a 7.5-hp, three-phase, 220-V, 19-A, 60-Hz, four-pole induction motor with a double-squirrel-cage rotor of design class C (high-starting-torque, low-starting current type): Test :No-load test at 60 Hz; Applied voltage V - 219 V line-to-line; Average phase current I, nl 5.70 A; Power Pnl -380 W; Test 2: Blocked-rotor test at 15 Hz; Applied voltage V 26.5 V line-to-line; Average phase current lbl 18.57 A; Power Pbl 675 W; Test 3: Average de resistance per...

  • Two tests were performed on a 230-V, 60-Hz, 4-pole, Y-connected, three-phase induction motor and the obtained...

    Two tests were performed on a 230-V, 60-Hz, 4-pole, Y-connected, three-phase induction motor and the obtained data are given in the table below. The friction and windage loss is 15 W, and the stator winding resistance between any two lines is 3.96ohm Determine: 1) The equivalent circuit parameters of the motor 3) The motor efficiency at a slip of 8%. No-load test 137 0.43 230 Blocked-rotor test 70 1.18 47 3-phase power input, W Line-line voltage, V

  • Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel...

    Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...

  • Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel...

    Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...

  • 1.   The following test data apply to a 208-V, 6-pole, Y-connected, three-phase induction motor: -   No-load...

    1.   The following test data apply to a 208-V, 6-pole, Y-connected, three-phase induction motor: -   No-load test: Power input = 336W, line current = 2A at rated voltage -   Blocked-rotor test: Power input = 600W, line current = 20A at the line voltage of 30-V -   The friction and windage loss is 36W. The resistance between any two lines is 0.2. Determine: a)   The equivalent circuit parameter of the motor. 2.   This motor is connected to a distribution feeder. The...

  • 4. A certain four-pole 240-V-rms 50-Hz delta-connected three-phase induction motor operates at slip 5% at full...

    4. A certain four-pole 240-V-rms 50-Hz delta-connected three-phase induction motor operates at slip 5% at full load and has rotational losses (windage + friction) of 100 W. The stator resistance per phase is 0.2 Ohm. The results of no-load and locked-rotor tests on this motor are as follows: No-load test Locked-rotor test Line-to-line input voltage: 240 V 45 V Input active power: 1100 W 1300 W Input line current: 10 A 30 A Using the tests data, determine parameters of...

  • The equivalent circuit of a 440 V, 3-phase, 8 pole, and 50 Hz star-connected induction motor (HELP)

    Question:  The equivalent circuit of a 440 V, 3-phase, 8 pole, and 50 Hz star-connected induction motor is shown in figure 1. The short-circuit test is conducted with a locked rotor and a line current of 80 A. The open-circuit test is conducted by supplying the stator winding at rated voltage and at the rotor is rotating freely without any mechanical load.           Fig. 1 The per-phase equivalent circuit of a 3-phase induction motora)  Determine the line voltage and power factor on the...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT