PG1995
Active Member
Hi
Let's assume we have a purely inductive load, and we have Q=Vrms*Irms*sin(θv − θi). The inductive load will absorb energy in first half cycle and then in the next half cycle retransmits that energy to the source. I hope I have it correct.
Would the electric utility meter give zero reading no matter if the load is run for hours? I assume it will give zero reading. I believe the electric utility meter measures the amount of energy consumed on basis of current passing through it in either direction. Even though the load retransmits the absorbed energy but how does the meter know that? Why would it give zero reading?
In what way the retransmitted energy of the load is used by the source? The source is not some kind of rechargeable battery which will get charged up by absorbing the energy which it previously transferred to the load. If the retransmitted energy of the load cannot be utilized by the source, then that energy has become useless.
I understand that what I say above is a little confusing but I hope you can clearly see my confusion. Please help me with it. Thank you.
Regards
PG
The real power P is the average power in watts delivered to a load; it is the only useful power. It is the actual power dissipated by the load. The reactive power Q is a measure of the energy exchange between the source and the reactive part of the load. The unit of Q is the volt-ampere reactive (VAR) to distinguish it from the real power, whose unit is the watt. We know that energy storage elements neither dissipate nor supply power, but exchange power back and forth with the rest of the network. In the same way, the reactive power is being transferred back and forth between the load and the source. It represents a lossless interchange between the load and the source.
Let's assume we have a purely inductive load, and we have Q=Vrms*Irms*sin(θv − θi). The inductive load will absorb energy in first half cycle and then in the next half cycle retransmits that energy to the source. I hope I have it correct.
Would the electric utility meter give zero reading no matter if the load is run for hours? I assume it will give zero reading. I believe the electric utility meter measures the amount of energy consumed on basis of current passing through it in either direction. Even though the load retransmits the absorbed energy but how does the meter know that? Why would it give zero reading?
In what way the retransmitted energy of the load is used by the source? The source is not some kind of rechargeable battery which will get charged up by absorbing the energy which it previously transferred to the load. If the retransmitted energy of the load cannot be utilized by the source, then that energy has become useless.
I understand that what I say above is a little confusing but I hope you can clearly see my confusion. Please help me with it. Thank you.
Regards
PG
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