NCEES #529

[Lielec11]

Why do they ignore the phase angle in the solution? They just do 1.5 - 1.0 divided by 1.0. Shouldn't the phase angle affect the voltage regulation?

 

[knight1fox3]

Why do they ignore the phase angle in the solution? They just do 1.5 - 1.0 divided by 1.0. Shouldn't the phase angle affect the voltage regulation?

See if this is any help: http://engineerboards.com/index.php?showtopic=8261

 

[Lielec11]

#529 in my NCEES question booklet deals ith Volage Regulation...

"The voltage regulation of a bus with a full-load voltage or 1.0 /_0 and a no-load voltage of 1.05/_1.5 pu is most nearly?"

In the solution they ignore the phase angles, why is this?

 

[Philip]

That link is to problem #129...

Stevenson 4th ed pg 92 (older edition of stevenson/grainger book)

percent regulation = [abs(Vnl) - abs(Vfl) ] / [Vfl] x 1000

I think NCEES solution is misleading since they have abs value of numerator, which is wrong, then show abs value of each voltage in numerator, which is correct.

 

[Philip]

x 100 not x 1000 sorry... not sure how to edit posts

 

[Philip]

That link is to problem #129...

Stevenson 4th ed pg 92 (older edition of stevenson/grainger book)

percent regulation = [abs(Vnl) - abs(Vfl) ] / [abs(Vfl)] x 100

I think NCEES solution is misleading since they have abs value of numerator, which is wrong, then show abs value of each voltage in numerator, which is correct.

and abs value of denominator, doh! i really need to figure out how to edit posts