Why generator supplies a leading power factor on under excitation?
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This is very simple…
For energy conversion from mechanical energy to electrical energy magnetic field energy (flux) is required and it is a constant value once machine is designed.(because flux proportional to v/f)
This field energy is nothing but reactive power.If we supply field energy then only electro mechanical energy conversion is possible.Actually it comes from alternator field(excitation)
If we give less reactive power from excitation then the remaining reactive power is supplied from grid (absorbing reactive power)and alternator is said to be under excited.
If we give more reactive power from excitation then the remaining reactive power is supplied to grid (delivering reactive power)and alternator is said to be over excited
For energy conversion from mechanical energy to electrical energy magnetic field energy (flux) is required and it is a constant value once machine is designed.(because flux proportional to v/f)
This field energy is nothing but reactive power.If we supply field energy then only electro mechanical energy conversion is possible.Actually it comes from alternator field(excitation)
If we give less reactive power from excitation then the remaining reactive power is supplied from grid (absorbing reactive power)and alternator is said to be under excited.
If we give more reactive power from excitation then the remaining reactive power is supplied to grid (delivering reactive power)and alternator is said to be over excited
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