HW7Sol

# HW7Sol - EEL 3216 Introduction to Power Systems Homework #...

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EEL 3216 Introduction to Power Systems Homework # 7 Solution 1. A 3-phase, 4-pole synchronous machine rotates CCW with 1500 rpm and produces a rated torque of 668.45 Nm at the shaft in CW direction. The total rated losses are 5 kW and the rated stator (copper) losses alone are 3 kW. The rated terminal current is measured to be 150.4 A with a PF = 0.8 lagging. a) Determine the missing electrical ratings of the machine (voltage, frequency, apparent power, and efficiency) and the induced torque (transferred between rotor and stator). Is a generator or a motor? Draw the power flow diagram of this machine (with actual values of the power included in the diagram). b) Size a transformer for this machine (voltage rating and winding configuration) which steps the line current down to 17.35 A. Chose a winding configuration that yields the smallest possible current in the windings of the transformer. Solution a) Since the torque is in opposite direction of the rotation this is a generator. The

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## This note was uploaded on 02/01/2012 for the course EEL 3216 taught by Professor Brooks during the Spring '08 term at FSU.

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HW7Sol - EEL 3216 Introduction to Power Systems Homework #...

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