- #1
terahertz
- 20
- 1
At the power-line frequency (50Hz), the wavelength of electromagnetic waves in free space is 6,000 km. Similarly, the phase velocity of voltage/current waves is about 4,000 km at this frequency. The question is, why do we bother about the wavelength at all at the power-line frequency, when the longest transmission line in the world is no longer than 1,100 km.
In other words, why do engineers working in the field of power transmission use transmission-line theory to analyse power transmission lines when circuit theory would be quite adequate (given that the length of a typical power transmission line is much smaller than the wavelength).
In other words, why do engineers working in the field of power transmission use transmission-line theory to analyse power transmission lines when circuit theory would be quite adequate (given that the length of a typical power transmission line is much smaller than the wavelength).