Where is Step up Transformer used in power transmission?

Question

And how about step down transformer where is it used in power transmission?

Answer 1

The step up transformer is used at the power generation site to raise the voltage to about 1 million volts. When the electricity gets to near where it is used, the voltage is stepped down to about 5000 volts. On your street, those round transformers on the top of some of the power poles do the final step down for home use. Why do they go to all that trouble? It's because in all those miles of wire, the power loss equals "I squared R" so power loss equals the square of the current (I) times the resistance of the wire. Power transmitted equals current times voltage. By stepping up the voltage to a million volts, you can transmit a lot of power without using a lot of current, therefore the energy losses are minimized and more power gets to the destination.

Answer 2

Step up is generally used to step up voltage to be transmitted over long distances and to reduce the size of the transmission lines. Because every time you double the voltage you cut the current in half. then on the other end of the circuit it is stepped down to a lower voltage for local distribution then again it is stepped down before it enters you business or home.

There are other applications for step up and step down transformers but are generally used between the 120/240 through 277/480 voltage range.

Answer 3

A step up transformer is used right after power production (i.e., as the electricity is leaving the plant) to transmit electrical currents across large distances. However, such high currents/voltages are unusable by civilians so they use step-down transformers within cities to bring the voltage and current to something usable.

Short answer:
Step up after power generation, step down before it enters the house.

Answer 4

The step up transformer is in a special location near the power station. The step down transformer are in selected locations of prospective power users.

Answer 5

C. The voltage is "stepped-up" after generation in transmission substations to decrease "I^2 R" losses. If the Voltage is high, than the current (I) will be lower, which decreases losses as the loss is the proportional to the square of the current ... thus the lower the current (i.e. higher the voltage,V=I*R) the more efficient.