The word “Elimination” is generally used to describe the whole concept of removing or controlling the error value to the stationary value of the power system. In this paper, an effort is made in the direction of development in the protection of power transformers. Protection of all types of transformer in the power system is very important for normal operation of the power system. Among the various operation of power transformer differential operation is a very common method. In this paper, we review the concept of power transformer differential protection then analyze the problem of transformer differential protection to find the solution. We then analyzed the different types of fault for study.