Electrical Power Distribution Transformers possess the highest level of power and as well as high voltage rating. The Distribution Transformers uses a cooling method that helps in determining the power rating and ideally some of the most commonly used methods include using oil or other kind of heat-conducting machine. The Distribution Transformers are of different kinds and ideally can be categorized on the type of insulation, number of phases, voltage class and basic impulse insulation level. Electrical Power Distribution Transformers come in different types which can be included under indoor type of distribution transformer used in the distribution of power consisting of a single generator within a power plant and offers three different phases of electricity on one armature.