Distribution transformers and power transformers are both types of transformers, with the main difference being their main applications and target loads.
 
A distribution transformer is a type of transformer used in low-voltage systems to provide high-voltage power to end-users such as residential, commercial and industrial facilities. They are usually installed at the end of the grid to convert high voltage power from power plants into low voltage power suitable for end users. Distribution transformers are usually less than 35kV and typically have a capacity of up to 5,000kVA.


Distribution transformers are usually either oil-immersed or dry-type transformers. Oil-immersed transformers use insulating oil to cool the transformer and insulate the electrical coils, while dry-type transformers use air or other gases to cool the transformer and insulate the electrical coils.
 
The primary function of a distribution transformer is to deliver electricity to end users to meet their energy needs. They are usually installed at the end of the network, such as on utility poles or in underground tunnels. Distribution transformers are very important components in an electrical power system as they help to ensure that power is correctly transmitted and distributed to meet the needs of end users.
 
A power transformer is a type of transformer used to deliver high voltage power to transmission lines in a power system. They are usually installed in power plants, substations and transmission lines of power systems to convert the high voltage power generated in power plants into low voltage power suitable for transmission over long distances. Power transformers usually have a voltage rating of 110kV or more and a capacity ranging from a few thousand kVA to several million kVA.
 
Power transformers are usually oil-immersed or dry-type transformers. Oil-immersed transformers use insulating oil to cool the transformer and insulate the electrical coils, while dry-type transformers use air or other gases to cool the transformer and insulate the electrical coils. The design and manufacture of power transformers requires a high level of skill and quality control to ensure that they operate safely and reliably when carrying larger electrical loads and higher voltages.


The primary role of a power transformer is to transfer power between different transmission lines and substations in order to transmit and distribute power across the grid. Power transformers are very important components in a power system as they help to ensure proper transmission and distribution of power to meet the needs of the end users.
 
In addition, the design and manufacture of power transformers typically requires a higher level of technology and stricter quality control to ensure their safe and reliable operation when carrying larger power loads and higher voltages.
 
In addition to the differences in primary use and target loads, there are a number of other differences between power transformers and distribution transformers:
 
Voltage regulation: power transformers are designed to regulate voltage for long distance transmission, while distribution transformers are designed to regulate voltage for long distance transmission. Local Distribution Networks. Power transformers require high voltage regulation accuracy, usually within a few percentage points, while distribution transformers have lower voltage regulation accuracy, usually around 5-7%.
 
Cooling system: power transformers are usually oil-immersed and naturally cooled or forced air-cooled, while distribution transformers are usually naturally air-cooled or forced air-cooled. The cooling systems of power transformers are designed to handle the increased heat generated by the higher electrical loads they carry.
 
Size and Weight: Power transformers are typically larger and heavier than distribution transformers because they have higher power ratings and require more insulation and cooling systems.
 
Location: Power transformers are usually located in substations, which are often located at the border between the transmission and distribution networks, while distribution transformers are closer to the end-user, often located on poles or in underground vaults.
 
Cost: Power transformers are usually more expensive than distribution transformers due to their larger size, higher power rating and more complex design.