What effect does reactive power have on transmission losses

Hello RobertOz

That "Sweet Spot" is going to vary, back and forth, each time the load/load reactance at the load end varies.

Please also remember that one power station will normally compensate faster than the other, and generate more/less power for the load as a result.

In earlier days, the "System Control" operators were almost driven mad by having to manually calculate load apportionment under a "many power station" plus many "load" and "Load Power Factor" conditions.

These days it's run from a small computer at the System Control Point, which distributes instructions to Power Station and Substation Computers, which alter their settings as instructed.

I understand that the Software involved is proprietary, and in effect it does what your Spreadsheet workings do, then instructs other slave computers with the data needed for adjustment.

I presently do not have a copy of that Software, sorry.

Kind Regards....

I don't have that software either

But I guess that's why god invented spending a seemingly infinite amount of time cursing at excel (just why did he feel he had to invent that anyway?)

Anyway - perseverence brings rewards - I found I was calculating the power loss incorrectly - now I have some great graphs showing the balance points & sweet spots balancing the two stations (unless I got it wrong again...). Here's a sample...

Hello RobertOz

The method of graphics insertion at limits the size of graphics, and your picture is hard to read, because it has been "shrunk".

I shall send you a PM, which should arrive in your Member's Mailbox.

That PM will include my address, and if you are able to "Zip" or compress that graphic, I shall be able to receive it, and view it in its full and beautiful details.

Kind Regards....

Your contributions have been invaluable.Apart from reading ur postings I have also like those symbols on ur messages.I don't know how u do it but pl. keep it up.

Best Regards

Robert,

I am interesting to take a look at your charts. Can you send me a copy of them to my account?

Thanks, Rey Galindo

Do you use distributed constants (or whatever they are called) with the transmission line? I mean R, jX, G and jB...

why not list out your model?

From this equation, we may understand more.

there are many factors to cause power loss on the line. so long distance, you can calulate it as transmission equation.

if you according to your pF, the best bet is increase voltage as high as possible. I was told.

Hi all -

Thanks for everyone's comments and interest - apologies for being a bit slow to respond.

I'm just going to see how this image comes out on screen before I send them to anyone separately for ease of communication (trying a larger file - CR4 may or may not squish it).

This is a graph showing what happens when I adjust the ratio of P and Q being sent from two different power stations to power the same load. The graph in my post above had some calculation errors that I later weeded out - hence its odd shape...

The graph shows line losses, so the most efficient point is the lowest spot - in this case when about 55% percent of both P&Q come from the closer station. The model allows changing variables (line impedance, power factor of load etc) and then the low point moves around depending on the variables changed...

And yes - as pointed out by CNPower - efficiency increases markedly with higher voltages - on the spreadsheet at least... the real-world lines that this models are not rated to carry very extremely high voltages.