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3. A 415 V, 250 HP, six-pole, 50 Hz induction motor has a full load slip of 4%, an efficiency of 89 %, and a power factor of 0.89 lagging. At start up, the motor develops 175 % of FLT, but draws 7 times full load current (on rated voltage). The motor must develop at least FLT at switch on, to ensure successful starting. If the fault level at the 415 V switchboard is 15 MVA, calculate the maximum length of cable which may be used to connect the motor, if the cable has reactance 0.005 2/metre. The above motor is to be corrected to operate at 0.95 lagging power factor. Calculate the amount of capacitance required to be connected at the stator terminals of the machine to achieve this, and the resulting capacitor values. 4.5 m, 12.8 kVAr per phase, 0.7 mF

3. A 415 V, 250 HP, six-pole, 50 Hz induction motor has a full load slip of 4%, an efficiency of 89 %, and a power factor of 0.89 lagging. At start up, the motor develops 175 % of FLT, but draws 7 times full load current (on rated voltage). The motor must develop at least FLT at switch on, to ensure successful starting. If the fault level at the 415 V switchboard is 15 MVA, calculate the maximum length of cable which may be used to connect the motor, if the cable has reactance 0.005 2/metre. The above motor is to be corrected to operate at 0.95 lagging power factor. Calculate the amount of capacitance required to be connected at the stator terminals of the machine to achieve this, and the resulting capacitor values. 4.5 m, 12.8 kVAr per phase, 0.7 mF

Introductory Circuit Analysis (13th Edition)
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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3. A 415 V, 250 HP, six-pole, 50 Hz induction motor has a full load slip of 4%, an efficiency of 89 %, and a power factor of 0.89 lagging. At start up, the motor develops 175 % of FLT, but draws 7 times full load current (on rated voltage). The motor must develop at least FLT at switch on, to ensure successful starting. If the fault level at the 415 V switchboard is 15 MVA, calculate the maximum length of cable which may be used to connect the motor, if the cable has reactance 0.005 2/metre. The above motor is to be corrected to operate at 0.95 lagging power factor. Calculate the amount of capacitance required to be connected at the stator terminals of the machine to achieve this, and the resulting capacitor values. 4.5 m, 12.8 kVAr per phase, 0.7 mF
Transcribed Image Text:3. A 415 V, 250 HP, six-pole, 50 Hz induction motor has a full load slip of 4%, an efficiency of 89 %, and a power factor of 0.89 lagging. At start up, the motor develops 175 % of FLT, but draws 7 times full load current (on rated voltage). The motor must develop at least FLT at switch on, to ensure successful starting. If the fault level at the 415 V switchboard is 15 MVA, calculate the maximum length of cable which may be used to connect the motor, if the cable has reactance 0.005 2/metre. The above motor is to be corrected to operate at 0.95 lagging power factor. Calculate the amount of capacitance required to be connected at the stator terminals of the machine to achieve this, and the resulting capacitor values. 4.5 m, 12.8 kVAr per phase, 0.7 mF
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