How to limit Short circuit by cascading

[hareeshks]

Hi,

I have a 400V, 65kA LV switchgear. I would like to connect a feeder from this LV switchgear to a DB with 25kA rating. In order to avoid the transformer to limit the short circuit, is it possible to use the cascading (current limiting type) breakers in both upstream and downstream? Any selection tools based on short circuit limitations?

[geir_eas_no_bfo · Accepted solution]

Hi,

yes you can.

check out these tools: https://ect.se.com/cbt/app/index.html#/Dashboard

BR

GIA

[hareeshks]

Thank you. Is there any impact on breaker selectivity in this case (current limiting). Will upstream breaker open for downstream fault?

[geir_eas_no_bfo · Accepted solution]

Hi, 

Yes.

You will find this in Complementary Technical information:

BR

GIA