NCEES 107

[EEpowerOK]

3 phase transmission line is rated at 65 KV and 24 MVA. The line impedance is 50 ohm per phase. Assuming line rated values are also the base values, the per unit Z is ?

Seems Zbase = Sq rt 3 * 65 KV^2 / 24 MVA

I assume the statement "Assuming line rated values are also the base values" makes

Zbase = 65 KV^2 / 24 MVA (Base part of the books answer)

?

 

[DK PE]

Think Zbase = V base 2 / S base so you have and extra sqrt 3. Then I assume you know the next step?

 

[knight1fox3]

Some additional discussion on that problem here: http://engineerboards.com/index.php?showtopic=6858

 

[DK PE]

I guess I was just looking at the text you entered and not problem number... the explanation from 107 referenced doesn't seem to match... we must have a mismatch somewhere?

Some additional discussion on that problem here: http://engineerboards.com/index.php?showtopic=6858

 

[DK PE]

look here... http://engineerboards.com/index.php?showtopic=8598

or here... http://engineerboards.com/index.php?showtopic=11550

 

[EEpowerOK]

Got it thanks

 

[knight1fox3]

May have been from an older exam administration. Sorry for the confusion.

 

[Flyer_PE]

^That's exactly what it was.