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!

Impedance of Transfomers in Ohms

Status
Not open for further replies.

Mbrooke

Electrical
Nov 12, 2012
2,546
Does anyone know how I can turn transformers into a simple ohm value as done with wires? I'm looking to make a series of tables electricians can use onsite.

One can, for example: for a single L-G fault choose 0.016 ohms for the POCO transformer, 0.002 ohms for the service, 0.035 ohms for the feeder (phase + EGC) and 0.25 ohms for the branch circuit (phase + EGC) to its furthest point.

Simple ohms law would take you to the required destination.

This can be used to find max fault current and to determine breaker disconnection times.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor