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A star-connected, 12.5 kW, 208 V (line), 3-phase, 60 Hz squirrel cage induction motor has following equivalent circuit parameters per phase referred to the stator: R1 = 0.3 Ω, R2 = 0.3 Ω, X1 = 0.41 Ω, X2 = 0.41 Ω. Neglect shunt branch in the equivalent circuit. The starting current (in Ampere) for this motor when connected to an 80 V (line), 20 Hz, 3-phase AC source is ________.
Correct answer is between '69,71'. Can you explain this answer?
Most Upvoted Answer
A star-connected, 12.5 kW, 208 V (line), 3-phase, 60 Hz squirrel cage ...
Concept:
The current is given as for star connected motor,
Calculation:
Given that,
R1 = 0.3 Ω, R2 = 0.3 Ω, X1 = 0.41 Ω, X2 = 0.41 Ω
Frequency (f) = 60 Hz
For star connected induction motor,
When supply is charged to 80 V (line), 20 Hz, reactance offered by stator & rotor will be changed because of change in frequency {∴ x ∝ f}
At 20 Hz, equivalent circuit can be drawn as,
Ist = 70.05 A
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A star-connected, 12.5 kW, 208 V (line), 3-phase, 60 Hz squirrel cage induction motor has following equivalent circuit parameters per phase referred to the stator: R1= 0.3 Ω, R2= 0.3 Ω, X1= 0.41 Ω, X2= 0.41 Ω. Neglect shunt branch in the equivalent circuit. The starting current (in Ampere) for this motor when connected to an 80 V (line), 20 Hz, 3-phase AC source is ________.Correct answer is between '69,71'. Can you explain this answer?
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