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| X/R Ratio https://brainfiller.com/arcflashforum/viewtopic.php?f=15&t=5170 |
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| Author: | mcgee9t2 [ Fri Sep 13, 2019 2:19 am ] |
| Post subject: | X/R Ratio |
Hello, Hoping you may be able to help. I have two models, (the models need to be kept seperate for confidentiality), lets call them model A and B. I am currently running arc flash calculations on Model B (have previously completed model A). Model B is fed from a substation on model A, as such i have taken the fault level at the relevent sub in model A and used as a utility in model B. i am unsure how to find the X/R ratio for the sub so i can transfer into the utility. i have tried creating an X/R datablock and imported X/R LL, X/R Neg, X/R Pos, X/R SLG & X/R Zero. however all display 0. even when i put a utility with an X/R of 8 onto a bus (i.e. no cabling or anything, therefore the X/R at the bus should be 8) it displays 0. am i missing something? is there an easy way for me to find out the X/R ratio at the switchroom so that i can transfer into the utility of Model B much appreciated for any info. |
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| Author: | JBD [ Fri Sep 13, 2019 6:12 am ] |
| Post subject: | Re: X/R Ratio |
It may depend on your software. But for these types of projects, I usually look at the Short Circuit output report to find the X/R. I know it hows up there on both PTW and ETAP. |
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| Author: | mcgee9t2 [ Fri Sep 13, 2019 6:41 am ] |
| Post subject: | Re: X/R Ratio |
found it, i was looking at the wrong datablock i needed iec909 XoverR Neg/Pos/Zero |
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