ETAP - Power Grid (Network Feeder)

[jonner]

I am unsure how to find the value of X/R=10 as figure shown below

http://tinypic.com/view.php?pic=ekjfqr&s=6

My queston is if Network Feeder = 500 MVAsc and 33KV , how can we find the Value X/R so it shows 10
Any information which you could supply would be very welcome

Jonner

 

[jghrist]

You need to get that from the utility. Or use a typical X/R. Did you get the 500 MVAsc from the utility? It sounds more like an equipment rating, which is not the same thing as the short circuit value.

 

[jonner]

I got the 500 MVAsc , X/R=10 fron Example IEC ETAP 700 for practice
I am not sure it's like equipment rating

but,
"Short Circuit Calculation Handbook" By Wayne L. Carey
or

http://www.msha.gov/TECHSUPP/ACC/shortcircuit/ShortCircuitCalculations.pdf

said about UTILITY:
The first step in analyzing a power system is to get the data for the power available at the site, the utility data. This data can be obtained from the Power Company. The data needed is the line to line voltage (VLL), short-circuit kVA (kVASC), and X/R.

The Handbook above said we need Vll, KVAsc and X/R from Power Company
and
you said I need to get X/R from the utility

Is that mean I have to ask The Power Company or Utility to get the X/R ??

 

[dpc]

Is that mean I have to ask The Power Company or Utility to get the X/R

Yes.

 

[jghrist]

Is that mean I have to ask The Power Company or Utility to get the X/R ??

"The Power Company" = "Utility"

 

[jonner]

Thanks.........