5. A 400-V, 3-phase, Y-connected synchronous motor takes 3.73 kW at normal voltage and has an impedance of (1 + j8) ohm per phase. Calculate the current and p.f. if the induced e.m.f. is 460 V. Answer is 6.28 A and 0.86 leading
Added by Jesse E.
Step 1
73 \text{ kW} = 3730 \text{ W} \) - Impedance per phase, \( Z = 1 + j8 \, \Omega \) - Induced e.m.f. per phase, \( E_f = 460 \text{ V} \) Show more…
Show all steps
Close
Your feedback will help us improve your experience
Adi S and 68 other Physics 102 Electricity and Magnetism educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A 220V, three-phase, Y-connected synchronous motor has a synchronous impedance of 0.25 + j25 ohm/phase. The motor delivers the rated load of 80A at 0.707 power factor leading. Determine a) the excitation voltage, b) the power angle, and c) the power developed by the motor. The answers should be: a) E = 298V b) -31.45 degrees c) Pdev = 16,817W
Adi S.
A three phase Y- connected load takes 50 A current at 0.707 lagging pf at 220 V between the lines. A three phase Y-connected round rotor synchronous motor, having a synchronous reactance of 1.27 ohms per phase is connected in parallel with the load. The power developed by the motor is 33 kW at a power angle of 300. Neglecting armature resistance, calculate the overall power factor of the motor and the load.
Mahnoor A.
6.) The input to a 11-kV, 3φ, Y-connected synchronous motor is 60 A. The effective resistance and synchronous reactance per phase are 1 Ω and 30 Ω respectively. Find (a) power supplied to the motor and (b) the induced e.m.f. for a p.f. of 0.8 leading. 7.) A 2,200-V, 3-phase, star-connected synchronous motor has a resistance of 0.6 Ω and a synchronous reactance of 6 Ω. Find the generated e.m.f. and the angular retardation of the motor when the input is 200 kW at (a) power factor unity and (b) power factor 0.8 leading.
Sri K.
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD