If alternator is Overexcited, it will deliver reactive power with lagging current
while in Under excited, it absorb reactive power with leading curreent
But, it always (under or over-excited) deliver real power.
WHY it needs or absorb reactive power???
Actually synchronous machine maintains constant flux. When dc field current gets reduced (under excited), To strengthen main field, it absorb reactive power (draw current from ac supply mains).
while in Under excited, it absorb reactive power with leading curreent
But, it always (under or over-excited) deliver real power.
WHY it needs or absorb reactive power???
Actually synchronous machine maintains constant flux. When dc field current gets reduced (under excited), To strengthen main field, it absorb reactive power (draw current from ac supply mains).
In reverse, when dc field current gets increased (overexcited), To weaken main field, it deliver reactive power to the bus bar.
All these are controlled by magnetizing and demagnetizing effect of armature reaction.
So basically Reactive power is the result of large inductive or capacitive loads in the circuit, such as motors.
You are right when you say that the average power consumed by reactive components (like inductor and capacitor) is zero.
Also the interpretation is proper as the reactive power actually travels "to and fro" from the source, in a continuous loop.
But it is eventually consumed as it is dissipated as heat in the conductors, and gets wasted.
You are right when you say that the average power consumed by reactive components (like inductor and capacitor) is zero.
Also the interpretation is proper as the reactive power actually travels "to and fro" from the source, in a continuous loop.
But it is eventually consumed as it is dissipated as heat in the conductors, and gets wasted.
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