Backup Overcurrent Protection

What about the manufacturer's instruction manual?

relay is micom p343, it suggest that set the voltage threshold, V Dep OC V<2 Set to a value above the voltage measured at the relay and upper voltage threshold setting, V Dep OC V<1 Set, should be set below the minimum corrected phase-phase voltage level for a close-up HV earth fault.

But through this information I am not able to make out. Plz help

If voltage is being measured in range as 395 V to 412 V ; this Upper voltage threshold is to be set below 395 V (1) .

More than 412 V , this voltage threshold(2) is to be set .

PT secondary is 110 v, then what should be the settings?

Considering the phase to phase voltage as 110 ;

104 V as Below 110 can be opted - provided we are not getting this reading in loaded / fully loaded / start up - condition ( normal ) .

120 V as above 110 V may be chosen based on no load / min load condition - being measured in different shift timings .

If volage and upper voltage threshold required for us is being interchanged , overcurrent protection will be activated . In that case , interchange these values as well - please .

Phase to phase voltage if is different , work out the value in a similar way . Regards .