Electrical_Power_Drivers-_ET3026WB-Chapt17_example_questions

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Unformatted text preview: le between E0 and E is 30o. (Voltage reference is the voltage E) What is the power factor? a) 0,86. b) 1. c) 0,64. d) 0,76. Example 17‐2a (approximate horsepower) Illustrated the figure below, a 500hp, 720rpm synchronous motor connected to a 3980V, 3‐phase line generates an excitation voltage E0 of 1790V (line‐to‐neutral) when the dc exciting current is 25A. The synchronous reactance is 22Ω and the torque angle between E0 and E is 30o. (Voltage reference is the voltage E) What is the horsepower at the output during this operation, neglecting the losses (iron, copper, etc)? a) 500hp. b) 375hp. c) 490hp. d) 125hp. Example 17‐2a (approximate torque) Illustrated the figure below, a 500hp, 720rpm synchronous motor connected to a 3980V, 3‐phase line generates an excitation voltage E0 of 1790V (line‐to‐neutral) when the dc exciting current is 25A. The synchronous reactance is 22Ω per phase and the torque angle between E0 and E is 30o. (Voltage reference is the voltage E) What is the torque at the output during this operation, neglecting the losses (iron, copper, etc)? a...
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This note was uploaded on 02/04/2014 for the course EE 1300 taught by Professor Bauer during the Spring '12 term at High Point.

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