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Distribution Transformer and Transmission Transformer are two distinct types of transformers used in the electrical power grid, each serving a specific purpose in the process of delivering electricity from the generation source to the end consumers. Here's a comparison between the two:

Distribution Transformer:

1. Purpose: A distribution transformer is used in the final stage of electricity delivery, stepping down the voltage from the distribution lines to a level suitable for residential, commercial, or light industrial consumption. It connects the distribution network to the consumers.

2. Voltage Level: Distribution transformers typically handle voltages ranging from 3.3 kV to 33 kV on the primary side (input) and step it down to 400 V, 230 V, or even lower on the secondary side (output), which are standard utilization voltages.

3. Size and Capacity: These transformers are smaller in size and capacity compared to transmission transformers, ranging from a few kVA (kilovolt-amperes) to a few MVA (megavolt-amperes).

4. Location: Distribution transformers are often found mounted on poles, in underground vaults, or in small substations located near the consumer load centers.

5. Design: They are designed for frequent on and off cycles, handling varying loads throughout the day as consumer demand changes.

Transmission Transformer:

1. Purpose: Transmission transformers are employed in the high-voltage transmission system, where they are used to step up the voltage of electricity generated at power plants to a much higher level for efficient long-distance transmission.

2. Voltage Level: These transformers operate at significantly higher voltage levels, typically from 66 kV up to 765 kV or even higher on the primary side, and can step down to another high voltage level or to the distribution voltage range, depending on their function in the grid.

3. Size and Capacity: Transmission transformers are larger and have higher capacities, ranging from several MVA to hundreds of MVA, designed to handle the massive power flows across the transmission network.

4. Location: They are usually installed in large substations or directly at power generation facilities.

5. Design: Designed for continuous operation with minimal load fluctuations, transmission transformers are built for maximum efficiency and reliability over extended periods, with features to withstand the stresses of high-voltage transmission.

In summary, while both types of transformers serve to change the voltage of electrical energy, distribution transformers focus on the final voltage reduction for consumer use, and transmission transformers facilitate the efficient transmission of power over long distances by increasing voltage levels.