Where is a step-up transformer typically located in a power distribution system?

A step-up transformer is specifically designed to increase the voltage level of electrical power for efficient transmission over long distances. In a typical power distribution system, these transformers are placed before the transmission lines to elevate the voltage from the generation level to a higher voltage level suitable for transmission.

The reason for this arrangement is largely due to the principle that higher voltages allow for lower current levels for the same amount of power, which reduces losses due to resistance in the transmission lines. By stepping up the voltage, the overall efficiency of the power distribution is improved, allowing for energy to be transmitted over longer distances without significant energy losses.

Placing the transformer after the transmission lines would not be effective, as power would already have been transmitted at a lower voltage level, negating the benefits of stepping up the voltage for efficient transmission. Thus, positioning the step-up transformer before the transmission lines is essential for optimizing the power distribution system.