ETAP Star View TCC kA 1

[wroggent]

I asked ETAP support this question already, but they informed me that my employer has allowed the support agreement to expire and thus won't help me. So, I thought I would ask here before spending $2k on the support for 6 months.


I am trying to do a coordination study in ETAP. There is an option to fault a bus(es) in 'Star' and update the fields in the 'TCC kA' tab for protective devices. When I click the 'Run/Update Short-Circuit kA' button in Star, the fault current is shown on the one-line as it should (correct value for the bus that is faulted). When I check the TCC kA tab for the protective devices upstream of the fault, the value shown is not for the bus I faulted. The value shown is for another bus and it won't change at all. The arrow on the TCC which shows the fault level is always the same too. Although, I can change the arrow by setting a user defined value instead of using a calculated TCC kA. I could do what I need by entering user defined values for everything, but this will take a long time, more time than I have. Do any of you have any experience with the TCC kA values not updating when you run a short circuit calculation in Star view in ETAP?

 

[vandal06]

When you run the kA update utility it populates the TCC clipping current field with the maximum fault current that device is subjected to, even if you are not developing a TCC for that worse case fault. This is one of the features I don't like about ETAP.

 

[wroggent]

I eventually had come to that conclusion. Thanks for verifying that.