7 a. Explain autotransformer starting method and wye-delta starting method of 3-D induction motor with necessary circuit diagram. b. Discuss built-in

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a. Explain autotransformer starting method and wye-delta starting method of 3-D
induction motor with necessary circuit diagram.
7
b. Discuss built-in undervoltage and overload protection of 3-O induction motor
with neat sketch.
c. A 3-0, 6-pole, 460V, 60HZ induction motor rated at 15hp is running at
1185rpm. The equivalent circuit has the following parameters (in ohms/phase):
R¡=0.22, R2=0.252, X1=1.2 N, X=1.29 N, Rc=317 2, Xm=42 2
i)Sketch the per phase equivalent circuit of the induction motor (with respect to
stator)
ii)Calculate slip and rotor frequency
iii) Stator current and total stator copper loss.
Transcribed Image Text:a. Explain autotransformer starting method and wye-delta starting method of 3-D induction motor with necessary circuit diagram. 7 b. Discuss built-in undervoltage and overload protection of 3-O induction motor with neat sketch. c. A 3-0, 6-pole, 460V, 60HZ induction motor rated at 15hp is running at 1185rpm. The equivalent circuit has the following parameters (in ohms/phase): R¡=0.22, R2=0.252, X1=1.2 N, X=1.29 N, Rc=317 2, Xm=42 2 i)Sketch the per phase equivalent circuit of the induction motor (with respect to stator) ii)Calculate slip and rotor frequency iii) Stator current and total stator copper loss.
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