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Both "power transmission transformer" and "power transformer" refer to electrical devices used in the transfer of electrical energy between circuits, typically changing voltage levels in the process. However, the terms are often used interchangeably, and their distinction can be somewhat nuanced, depending on the context in which they are used. Here's a general attempt to clarify:

1. Power Transformer: This is a broad term that encompasses any transformer designed to handle significant amounts of power, typically in an electric utility's network or heavy industrial applications. Power transformers can be found in various stages of power distribution, including generation, transmission, and distribution. They are designed to efficiently step up or step down voltage levels as required for efficient power transfer.

2. Power Transmission Transformer: This term is more specific and usually refers to transformers that are part of the high-voltage transmission system. These transformers are specifically designed to increase (step-up) the voltage at the generating station before power is transmitted over long distances to minimize losses, and then to decrease (step-down) the voltage at substations near the consumer load. Transmission transformers operate at very high voltages (tens or hundreds of kilovolts) and are crucial components in the grid's infrastructure, enabling the bulk movement of electricity from power plants to distribution networks.

In summary, while a "power transformer" is a general category that includes all transformers designed for handling substantial power loads, a "power transmission transformer" specifically refers to those transformers employed in the high-voltage transmission system for moving electricity over long distances. The latter is essentially a subset of the former, with a more specialized role in the power grid.