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Topic Title: Synchronous Machine Question?
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Created On: 20 June 2013 04:12 PM
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 20 June 2013 04:12 PM
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Joined: 20 June 2013

A company has multiple production lines containing a great number of induction
motors and other inductive loads, resulting in a low power factor. When the company
is operated at its full production capacity, the total power consumption is 2 MW and
the power factor 0.65 lagging, but the grid power supply requires the power factor to
be no less than 0.80 lagging. For power factor compensation, a 3 phase, star
connected, 4 pole, 6000 V (line-line), 50 Hz, round rotor synchronous machine is
operated as a motor at no load. The synchronous reactance of the machine is 15 ohms per
phase, and the field current is 150 A DC when the stator open circuit terminal voltage
equals the rated voltage. Assume a linear open circuit characteristic and ignore the
stator winding resistance and all rotational power losses.

(a) Calculate the capacity in MVA of the synchronous machine required to achieve
the satisfactory power factor;

(b) Calculate the corresponding field current.

Please help me with this questions, thanks
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Edited: 01 July 2013 at 08:09 PM by gotbfdk

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