[開課學院]: 資電學院
[開課系所]: 電機系
[課程名稱]:
[老師名稱]: 張正泓 老師
[開課學期]:
[類型]: 98-2期末考
[1]Use phasor diagrams to prove that operating power factor of centrifugal-
capacitor-strat induction motor at starting is higher than that at steady
state.
[2]Prove that the Direct-Axis Reactance in salient-pole synchronous machine.
[3](a)How do you control the active and reactive powers of a synchronous
generators?Use some diagrams and equations to prove your answer.
(b)Comment the method you adopted in (a)
[4]Amortisseur windings are mounted in synchronous generators to stabilize
machine speed should the rotor depart from synchronous speed?Use some simple
expressions to describe your answer.Discuss the following three conditions:
(1) Slip > 0 (2) Slip = 0 and (3) Slip < 0
[5]A salient-pole synchronous machine has the following data in per-unit:
Internal Electromotive Force of 1.46∠38 ;Armature Current of 0.46∠-35 ;
Direct-Axis Reactance of 0.96 ; Quadrature-Axis Reactance of 0.58.
(a)Sketch the complete phasor diagram,using the standard representations.
(b)Calculate the armature terminal voltage.
[6]Give your comments and advices on this course.
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