3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results. Voltage (V) Current (A) 6.7 Power (W) 500 (including 230W Open-circuit test 420 mechanical loss) 980 Locked-rotor test 99 14.0 (a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected stator winding. (b) Determine the torque, output power, input line current, power factor and efficiency if the machine operates with a slip of 0.03. (c) If the stator winding is actually connected in delta what would be the value of resistance per-phase obtained from direct measurement?
3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results. Voltage (V) Current (A) 6.7 Power (W) 500 (including 230W Open-circuit test 420 mechanical loss) 980 Locked-rotor test 99 14.0 (a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected stator winding. (b) Determine the torque, output power, input line current, power factor and efficiency if the machine operates with a slip of 0.03. (c) If the stator winding is actually connected in delta what would be the value of resistance per-phase obtained from direct measurement?
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:3. A 12-pole, 420 V, 10 kW, 50 Hz, three-phase induction motor gave the following test results.
Voltage (V)
Power (W)
Current (A)
6.7
Open-circuit test
420
500 (including 230W
mechanical loss)
980
Locked-rotor test
99
14.0
(a) Calculate the parameters of the per-phase equivalent circuit assuming a star-connected
stator winding.
(b) Determine the torque, output power, input line current, power factor and efficiency if
the machine operates with a slip of 0.03.
1
(c) If the stator winding is actually connected in delta what would be the value of resistance
per-phase obtained from direct measurement?
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