Generator Capability Curve
Power Projects 
This post describes the boundaries within which a Generator can deliver reactive power continuously without overheating.
Capability Curve of Generator
The capability Curve of a Generator defines the boundaries within which it can deliver reactive power continuously without overheating.
Generator rating is specified in terms of MVA and power factor at a particular terminal voltage. Active power delivered by the generator is only limited by the power delivering capability of the turbine.
But the reactive power which a generator can deliver continuously without overheating is governed by three limits: Armature Current Limit, Field Current Limit and End Part Heating Limit.
Armature Current Limit
Armature current is the load current in the stator winding. Let the armature current is I. This current will lead to heating of stator winding due to ohmic losses I2R in the resistance of stator winding.
This means that a constraint is put by the limit of cooling of the generator stator winding. Ideally, there is a balance between the heat produced by I2R loss and the cooling of the stator winding. But if the heating of stator winding is more than,
Categories: : Load flow
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