How is energy conserved when power is stepped up from 11kv to 132kv?
How is energy conserved when power is stepped up from 11kv to 132kv?
Actually it's the voltage to that is usually stepped up to save the energy that would be lost otherwise during the transmission of the current. Assume the power to be transmitted is P, and the resistance of the transmission line is r.
If the power is transmitted with voltage V, then the current flow through the transmission line is I=P/V.
Since P and r are fixed conditions, less power will be lost if high voltages V are used.
High current generates more heat(H=I²rT) and would require materials which not only transmit more current, but also tolerate high temperature. Lesser quantity of conductors means less weight for the towers to support. Therefore, the towers can be constructed with less material and would require less space (This is important specially for the towers in Forest regions as it results in lesser deforestation).
In short, it is more economical and more efficient to transmit power in low current and high voltage.
PS:Note that the power that is transmitted is a constant,so the energy that is transmitted is also a constant (energy=power × time)
Assume the power to be transmitted is P, and the resistance of the transmission line is r.
If the power is transmitted with voltage V, then the current flow through the transmission line is I=P/V.
Since P and r are fixed conditions, less power will be lost if high voltages V are used.
High current generates more heat(H=I²rT) and would require materials which not only transmit more current, but also tolerate high temperature. Lesser quantity of conductors means less weight for the towers to support. Therefore, the towers can be constructed with less material and would require less space (This is important specially for the towers in Forest regions as it results in lesser deforestation).
In short, it is more economical and more efficient to transmit power in low current and high voltage.
PS:Note that the power that is transmitted is a constant,so the energy that is transmitted is also a constant (energy=power × time)
