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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. The invention of a practical efficient transformer made AC power distribution feasible; a system using distribution transformers was demonstrated as early as 1882.

Current transformers, along with voltage or potential transformers, are instrument transformers. Instrument transformers scale the large values of voltage or current to small, standardized values that are easy to handle for measuring instruments and protective relays. The instrument transformers isolate measurement or protection circuits from the high voltage of the primary system.

A single phase transformer is an electrical instrument that uses single-phase AC input and provides single-phase AC. This is employed in the distribution of energy in non-urban regions as the overall demand and prices involved are lower than the 3-phase type of transformers. They are utilized as a step-down device to reduce the home voltage to an appropriate amount without a variation in frequency.

Distribution transformers are normally located at a service drop, where wires run from a utility pole or underground power lines to a customer's premises. They are often used for the power supply of facilities outside settlements, such as isolated houses, farmyards or pumping stations at voltages below 30 kV. Another application is the power supply of the overhead wire of railways electrified with AC. In this case single phase distribution transformers are used. 

You can find more information about Transformers in the following links.

Refrences:

https://www.gm.com/

https://www.ethosenergygroup.com/

https://www.linquip.com/blog/what-is-a-distribution-transformer/

https://en.wikipedia.org/wiki/Current_transformer

https://www.linquip.com/blog/what-is-a-single-phase-transformer/

https://en.wikipedia.org/wiki/Distribution_transformer

https://www.linquip.com/blog/what-is-the-current-transformer/

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