Application
Distribution Transformer is an electrical isolation transformer which converts high-voltage electricity to lower voltage levels acceptable for use in homes and business. A distribution transformer’s function is straightforward: to step down the voltage and provide isolation between primary and secondary. Electrical energy is passed through distribution transformers to reduce high-distribution voltage levels down to end-use levels. Nearly all energy passes through at least one distribution transformer before being consumed by an end-user appliance, motor, or other pieces of equipment. Distribution Transformers are found in all sectors of the economy: residential, commercial, and industrial.

❏ Distribution transformers are generally categorized in several ways:
❏ Type of insulation: liquid-immersed or dry-type
❏ Number of phases: single-phase or three-phase
❏ Voltage level (for dry-type): low or medium

General-purpose Distribution Transformers
A distribution transformer or service transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer, these are generally used for supply appliance, lighting, motorized machine and power loads from electrical distribution systems.

Distribution Transformers provide the necessary power for systems and buildings on the last transformation step from the power station to the consumer. Accordingly, their operation must be reliable, efficient, and at the same time silent.

They are either ventilated or totally enclosed and are available with either aluminum or copper windings in standard ratings from 50KVA up to 3000kVA and more. The final part of the distribution system at medium voltage is the distribution transformers.

Construction
Distribution transformers are made using a core made from laminations of sheet steel stacked and either glued together with a resin or banded together with steel straps. Where large numbers of transformers are made to standard designs, a wound C-shaped core is economic to manufacture. A steel strip is wrapped around a former, pressed into shape, and then cut into two C-shaped halves, which are re-assembled on the copper windings.