au08 q&a - ece643-exam #2 au/08 1. (20 points total)...

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ece643-exam #2 – au/08 Page 1 of 2 1. (20 points total) Misc. questions [each question of equal value.]. (a) A 3 φ synchronous generator is operating fully loaded and is a part of a large interconnected system when suddenly a 3 φ short circuit occurs on its terminals. Obviously there can be no instantaneous change in speed of the machine, however in the first few electrical cycles following the short circuit what will be the trend related to the rotor speed: slow down or stay the same or speed up (b) A 3 φ synchronous motor is operating fully loaded and is connected to an infinite bus when suddenly a 3 φ short circuit occurs on its terminals. Obviously there can be no instantaneous change in speed of the machine, however in the first few electrical cycles following the short circuit what will be the trend related to the rotor speed: slow down or stay the same or speed up (c) The following is Kirchhoff’s Voltage Law in the direct axis for a synchronous machine in the dq0 reference frame. What part of that equation represents what is referred to as the
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au08 q&a - ece643-exam #2 au/08 1. (20 points total)...

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