Is it wrong to model a project with transformers with tap at X%

[Dvhez]

I'm a trainee engineer and I was modelling a project in ETAP and to keep voltage regulation above 3% I setted a specific transformer at -2.5%, but then my boss told me not to do that because the projected system is supposed to not consider any tap setting at transformers.

 

[RRaghunath]

Boss is right, tap change is for future eventualities. At design stage, you don't consider tap to be at any other place than nominal.