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Power transformers are used in electricity transmission and primary-distribution systems. They are used to increase (step up) the voltage supplied by generators at power stations to the extremely-high voltages necessary for electricity transmission and, at bulk power centres, to incrementally reduce (step down) those voltages to lower levels.

Transmission is only possible at high voltages because, for a given load, the higher the voltage the lower the resulting load current. Reduction in load current results in manageable voltage drops along the line, conductors of practical size/weight, and minimises the line losses.

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Q: What is the role of power transformers in power systems?
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