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A power transmission transformer is an electrical device crucial for the efficient and safe transmission of electrical power over long distances. It plays a vital role in the electrical grid by stepping up or stepping down voltage levels, enabling power to be transmitted at high voltages and then transformed to lower, safer voltages for distribution and consumption.

When AC voltage is applied to the primary winding, an alternating magnetic field is induced in the transformer's core, which in turn induces a voltage in the secondary winding due to mutual induction. According to Faraday's law of electromagnetic induction, the voltage induced in the secondary is proportional to the number of turns in the windings, allowing for precise voltage transformation.

Power transmission transformers are critical infrastructure components in the electrical grid, enabling the efficient and cost-effective delivery of electricity from generation plants to consumers, making them indispensable for modern societies and economies.