Question

A 12-pole, 3-phase, 50 Hz, delta-connected induction motor draws 280 A and 110 kW under blockedrotor test at rated voltage and frequency. Find the starting torque when switched on direct to the supply. Assume the stator and rotor copper losses to be equal under the blocked-rotor test. What would be the starting torque if the motor is started by connecting the phase windings in star?

Name: a 12 pole 3 phase 50 hz delta connected induction motor draws 280 a and 110 kw under blockedrotor test at rated voltage and frequency find the starting torque when switched on direct to the 28612
Uploaded: 2025-03-09T14:44:02-08:00
Duration: 1 min 57 s
Channel: Narayan Hari
Description: a 12 pole 3 phase 50 hz delta connected induction motor draws 280 a and 110 kw under blockedrotor test at rated voltage and frequency find the starting torque when switched on direct to the 28612

          A 12-pole, 3-phase, 50 Hz, delta-connected induction motor draws
280 A and 110 kW under blockedrotor test at rated voltage and
frequency. Find the starting torque when switched on direct to the
supply. Assume the stator and rotor copper losses to be equal under
the blocked-rotor test. What would be the starting torque if the
motor is started by connecting the phase windings in star?

Added by James H.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Narayan Hari

03/09/2025

Step 1

The power factor (pf) can be calculated using the formula for power in a three-phase system, which is P = √3 * V * I * pf, where P is the power in watts, V is the line voltage in volts, I is the line current in amperes, and pf is the power factor. However, we are Show more…

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A 12-pole, 3-phase, 50 Hz, delta-connected induction motor draws 280 A and 110 kW under blockedrotor test at rated voltage and frequency. Find the starting torque when switched on direct to the supply. Assume the stator and rotor copper losses to be equal under the blocked-rotor test. What would be the starting torque if the motor is started by connecting the phase windings in star?