Relay coordination problem, please help!

dl324

Joined Mar 30, 2015
16,943
We don't do homework. You need to show your work.

What course is this from? The acronyms don't mean anything to me...

You should use a more descriptive title. You have two threads with this title, but they're different problems.
 

mvas

Joined Jun 19, 2017
539
I believe that ...
"FDR" = Fault Detection Relay
"OCR" = Over Current Relay
"TCC" = Time Current Curve - "Amps-Seconds" Digital Overload Sensing
"CTI" = Coordinated Time Interval

Protection for power distribution circuits
 
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