I've Nprint 16.x and attached sample steps It should work in Nprinting 17 as well.
your case try like this
1) add you measure as filter (enable verify filter and is numeric option is check then ad filter value as
= Exp1>30000 then save your filter and ad filter into your excel template /report.
Sample.zip 135.9 K
the example by Devarasu works only in NP 16.
Quoting Stephen Jasionowski from thread Advanced Search filters in NPrinting 17.5
It's not supported currently but is on the roadmap.
At this time, NPrinting 17 filters can only return a single value, not an array like is possible in NPrinting 16.