Originally Posted by

**Mike01**
In reviewing generator data sheets I found they typically do not list the x/r, and was hoping someone could point me in the right direction, I have on document that indicates for most machines X/R can be approximated at X/R=2*PI*f*Ta assuming that x2 is approximate the same as x”, however looking at the gen. data sheets It appears that the x2 and x” are not equal for this specific gen. [0.2625 vs 0.1655], I found another publication [reference to it C37.013 generator brkrs] that reference to calculate the x/r for the gen breaker [I assume this would also be adequate for the gen] that assumes X=x”, and R=x2/2*PI*f*Ta, with the x” and x2 not being equal this provides different results, just curious if there are any publications with reference to this or if the C37.013 is the one typically followed??

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