Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations IDS on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Utility Contribution

Status
Not open for further replies.

CuriousElectron

Electrical
Jun 24, 2017
187
I've got Medium Voltage utility service supply feeding a fuse which supplies a pad-mount downstream. Is there any way to estimate utility fault contribution at the fuse(upstream of the xfmr) without requesting this data from utility?
Thanks,
EE
 
Replies continue below

Recommended for you

WAG?

Bill
--------------------
"Why not the best?"
Jimmy Carter
 
What are you using the estimated information for? Why not ask the utility?
 
Drive the utility feeder (if OH) back to the substation to get an approximate feeder length. Then take a look at the transformers in the substation. For 15 kV class, transformers are generally in the 10 - 30 MVA range. If you assume 10 to 20 kA at the substation, then add in the feeder impedance, you should be in the correct order of magnitude. Your local pad-mounted transformer will have a vastly bigger impact on the secondary side fault current than the available 15 kV fault current at your facility.

Or you could ask the utility.
 
I asked the utility for this fault contribution value.

Thanks all for the responses.
Regards,
EE
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor