Q. Over excited synchronous generator runs at
Solution:
If the field current is more than the normal field current, motor is said to be over excited. This excess field current produces excess flux (flux set up by DC supply rotor winding ? resultant air gap flux) which must be neutralized by the armature winding.
Hence the armature winding draws lagging power factor which delivers reactive power.
An under excited synchronous generator runs at leading reactive power .
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