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thanks for your comment wroggent. it will help me. So the point is in the etap there are no option for automatically model zsi. we can model zsi just with manually set the clearing time. thanks a lot i will try .

thanks ron. but i didnt found it in etap help. i still dont know how to simulate zsi method. have you ever try it in your etap?

Dear all, i wanna ask about arc flash. which software that can modelling zone selective interlocking protection (ZSI) for reduce arc flash energy? does etap can do that? thanks..