Okay,, thanks thanks my friend for new informationThe reactive power is not intentional. It's a result of the various capacitances and inductances in the circuit. In the case of a transmitting antenna it can be a result of impedance mismatch between the RF amplifier, drive cable, and antenna impedance. If they are all matched then there is no reactive power.
okay my friend,, I have understood what are you talkingAs crutschow said, reactive power is unintentional. If we could figure out ways to do what we want without producing it, we would. But we usually can't, so instead we find ways to minimize it's detrimental impact. Often that involves generating opposing Q to cancel out the unavoidable Q, so you could say that this is a benefit of Q.
okay,, thats mean Q for net inductive(absorbs) and -Q for net capacitive(supplied)The sign of the reactive component tells you whether you are looking at net inductance or net capacitance.
The source is generally considered ideal (though possibly with a source impedance associated with it to account for the major non-idealities) and so is neither inductive or capacitive. The phase angle between voltage and current in the source is dictated by the load. It's the load that is either inductive or capacitive.okay,, thats mean Q for net inductive(absorbs) and -Q for net capacitive(supplied)
so i can said motor and T.L. is net inductive , generator is capacitive or What??
How generator is net capacitive ??
please explain more my friend with examples for that
okay ,, i.e. for previous attached photo the machine on the right side of sys is generator and -Q means capacitive load (leading P.F.).The source is generally considered ideal (though possibly with a source impedance associated with it to account for the major non-idealities) and so is neither inductive or capacitive. The phase angle between voltage and current in the source is dictated by the load. It's the load that is either inductive or capacitive.
If you assign the current so that it is going into the positive terminal of the device, then you are treating the device as a load and positive reactive power means the load is net inductive.
We don't "transmit" reactive power, it is a result of the load's characteristics. In fact, the power companies put giant capacitors on the pole to correct the power factor to offset the effect of the inductance in all of the appliances being fed power.Hi guys,,
I wonder why we transmitted reactive power if the load just consumed the real power??
Can anyone explain that to me clearly??
Your example is somewhat confusing. if S1 & S2 both have a negative real power component then the related machines (generator & motor) must both be sending real power into the network. The motor would have to be in regenerating mode. I'm not sure where you get the zero net power result from.okay my friend,, I have understood what are you talking
BUT ,, i mean that
lets assume that ... there are system as attached photo
A generator has S1 = -1000+j268
A Motor has S2 = -1000-j268
and a transmission line(T.L.) between them has impedance is Z= 0+j5 Ω and the current through T.L. is 10.35 ampere
thus P = -1000 -(-1000) =0 W
Q = 268 -(-268) = 536 Var = I^2 * X
By power value ,P, and current direction through (in or out) machine , I can conclude the type of machine (Generator or Motor)
By Reactive power ,Q, value What can i conclude by this value ?? and what means this value Q= -268 or 268 or 536 Var ??
While I would say that this is not a complete answer, it may well have been quite reasonable within the context of which it was being given.Really thanks for you
bountyhunter t_n_k WBahn
my teacher answered me and said "we really needed to reactive power Q to establish the magnetic filed flux between the primary and the secondary coils "
Okay,, I don't get more information about it but now I searching about it in Google and founded a link ,,I hope this link help youWhile I would say that this is not a complete answer, it may well have been quite reasonable within the context of which it was being given.
Help me what?Okay,, I don't get more information about it but now I searching about it in Google and founded a link ,,I hope this link help you
http://www.sari-energy.org/PageFile.../lecture_41CRKReactivePowerManagementCEB2.pdf