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How to calculate X/R for Radial power network

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Yoyoman74

Electrical
Joined
Oct 13, 2016
Messages
2
Location
AE
Hi All

i'm a recent graduate and wish to benefit from the experienced power design engineers here.

i'd like to calculate X/R for 3phase symm short circuit for a radial power system, can you be kind enough to check if the way i did the x/r is correct for positive seq imp, since i'm only doin symm SC. the Z400 when added to ZT1 it needs to be reflected to the primary side of T1. can someone please let me know if i'm calculating x/r correctly. please see attached rough sketch. thank you
 
 http://files.engineering.com/getfile.aspx?folder=727a605b-f478-4cf0-9329-c84f300b5fb7&file=Untitled-1_(1).png
6.6_kV_0.4_kV_equivalent_X_R_u4ffkm.jpg
 
thanks alot 7anoter, appreciate it.
 
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