Have project consist of many buildings the power supply 33/11/0.4 KV , then have emergency power supply consist of generators , step up transformer 0.4/11KV .synchronizer .then to ATS .The question are to design safety components to safe the feeder line only when feeds by emergency power .

Why don't you give more details like how many buildings(load in kVA/kW),howmany gensets(load kVA/kW) distance between them electrical layout etc