B. In a series of tests to determine the parameters of an eight pole, three-phase 3300 V, 50 Hz, 500 kW induction motor, the test results were obtained. The stator winding resistance was separately determined to be equal to 0.3 N, and the mechanical losses are equal to 10 kW. Table 1 Test results for wound-rotor induction machine Test No-load test |Locked-rotor test Voltage 3300 V 336.6 V Current 4.711 A 86.56 A Power 10.01 kW 12.24 kW (i) (ii) (ii) (iv) Calculate the synchronous speed of the motor. If the slip at rated load is 0.02, calculate the full-load speed of the motor. Calculate the shaft torque at rated load. Using the test results in table 1, calculate the parameters of the approximate equivalent circuit. If the motor is started direct-on-line, calculate the starting current, and the developed starting torque. The magnetizing branch can be neglected in this analysis. What is the disadvantage of starting big motors using direct-on-line starting? (v) (vi)

B. In a series of tests to determine the parameters of an eight pole, three-phase 3300 V, 50 Hz, 500 kW induction motor, the test results were obtained. The stator winding resistance was separately determined to be equal to 0.3 N, and the mechanical losses are equal to 10 kW. Table 1 Test results for wound-rotor induction machine Test No-load test |Locked-rotor test Voltage 3300 V 336.6 V Current 4.711 A 86.56 A Power 10.01 kW 12.24 kW (i) (ii) (ii) (iv) Calculate the synchronous speed of the motor. If the slip at rated load is 0.02, calculate the full-load speed of the motor. Calculate the shaft torque at rated load. Using the test results in table 1, calculate the parameters of the approximate equivalent circuit. If the motor is started direct-on-line, calculate the starting current, and the developed starting torque. The magnetizing branch can be neglected in this analysis. What is the disadvantage of starting big motors using direct-on-line starting? (v) (vi)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Latches and Flip Flop

Just like logic gates, the latches and flip-flops are the important elements of an electronic circuit. The logic gates form the important part of combinatorial circuits, while the latches and flip-flops form the essential part of a sequential circuit. Sequential circuits form the important concept of automata theory in electronics and electrical engineering, these circuits are a kind of logic circuit whose output depends on both present input and past inputs, that is, the input history.

Question

100%

Solve (IV), (v), (vi) and (vii)

B. In a series of tests to determine the parameters of an eight pole, three-phase 3300 V, 50 Hz,
500 kW induction motor, the test results were obtained. The stator winding resistance was
separately determined to be equal to 0.3 N, and the mechanical losses are equal to 10 kW.
Table 1 Test results for wound-rotor induction machine
Test
Voltage
3300 V
336.6 V
Current
Power
No-load test
4.711 A
10.01 kW
Locked-rotor test
86.56 A
12.24 kW
(i)
(ii)
(iii)
(iv)
Calculate the synchronous speed of the motor.
If the slip at rated load is 0.02, calculate the full-load speed of the motor.
Calculate the shaft torque at rated load.
Using the test results in table 1, calculate the parameters of the approximate
equivalent circuit.
If the motor is started direct-on-line, calculate the starting current, and the developed
starting torque. The magnetizing branch can be neglected in this analysis.
What is the disadvantage of starting big motors using direct-on-line starting?
(v)
(vi)
(vii) Calculate the external resistors that should be connected in the rotor circuit to achieve
maximum starting torque.
(viii) Calculate the starting current and the starting torque when the resistors calculated in
part (vii) are in the rotor circuit.
By what factor does the addition of the external resistors increase the starting torque?
(ix)

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