5. A 3Φ, 1385.6 v, star-connected synchronous motor, having synchronous reactance of 2 Ω/phase and negligible resistance takes an input of 207.84 kW with an induced emf of 916.5 volts/phase. Calculate the motor line current and pf. Draw the vector diagram ANSWER: [100 A; 0.866 lead]

5. A 3Φ, 1385.6 v, star-connected synchronous motor, having synchronous reactance of 2 Ω/phase and negligible resistance takes an input of 207.84 kW with an induced emf of 916.5 volts/phase. Calculate the motor line current and pf. Draw the vector diagram ANSWER: [100 A; 0.866 lead]

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

SHOW YOUR COMPLETE SOLUTION:

5. A 3Φ, 1385.6 v, star-connected synchronous motor, having synchronous reactance of 2
Ω/phase and negligible resistance takes an input of 207.84 kW with an induced emf of
916.5 volts/phase. Calculate the motor line current and pf. Draw the vector diagram
ANSWER: [100 A; 0.866 lead]

6. A synchronous motor has an equivalent armature reactance of 3.3 Ω. The exciting current is
adjusted to such a value that the generated emf is 950 V. Find the power factor at which the
motor would operated when taking 80 kW from a 800-V supply mains.

ANSWER: [0.965 lead]

Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.

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