Main objective of this report is to analysis Uttara Grid Substation Operation (132/33/11KV), Maintenance and rotection System of DESCO. This report show the total working procedure of power transmission, distribution, substation operation, controlling and various protection systems. Other objectives are operation of 132/33/11KV substation and the process of power transmission and distribution. Finally make an analysis of total power consumption, various losse and specify the fault and their protection systems.