Parrallel working of power transformer having advantage as:
1- To minimized the load loss in transformer during pike time (according to load graphic)
2- Increasing the reliability and effeciency of power system
3- keep the permissible temperature rise in top oil & winding under safety margin
4- low investement capital by comparing with one transformer (in same capacity of two)
in contrary also having:
1- Increasing the no load loss in transformer during off- pike time
2- Increasing the short circuit current, becuase the total impedence is divided by two
Thus the parrallel operation of power transformer need the flexible monitoring by operators that working in Dispatching Control Center according two the load graphic of local load.