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Thank you for your reply dcp .

Thank you for your post dpc. So what is a good guideline to follow when protecting these curves?

Thank you for your reply and for that valuable information. I am not trying to find a margin for a specific transformer. I am trying to find a standard that specifies how much of the transformer through-fault curves shall be covered by primary side main protection device for all: IEEE Std...

In regards to transformer damage curves. How much of those curves must a protection device cover ( "be to the left and under" when plotting protection device TCC curve on top of TR damage curves) ? What is the standard allowable margin? Thank you.