DG Sync Panel Instead of 4P Breaker

Economy, of course! The three poles of a contactor, when parallelled can be used for a higher size neutral current than that of a 4-Pole ACB.

Dear sir,

Firat of all synchronizing means, parallel operation of multiple DG's as you know, in this case the neutral potential of the each DG will differ one to other, when we paralleling the DG's only one neutral should be present in the bus bar because if we connect multiple neutrals due to potential difference the control system will deduct circulating current and trip the circuit breaker immediately. hence in synchronization the neutral contactor of master DG only will be in closed condition, other follower DG's will run in floating condition. due to this only we are using 3 pole breaker + neutral contactor

Hope i cleared your doubt

Dear shajahan

which relay has been used in the sync panel to open the neutral contactor