District of Columbia Approval of Clean Up (Electric Transmission Line Construction)
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FAQ
Line voltage drop, voltage regulation, and transmission efficiency are important factors that govern the performance of the transmission lines. The voltage regulation of a transmission line varies with the effect of the line parameters R, L, and C on the line length.
The transmission over long distances creates power losses. The major part of the energy losses comes from Joule effect in transformers and power lines. The energy is lost as heat in the conductors. The overall losses between the power plant and consumers is then in the range between 8 and 15%.
It depends on the length of the conductor. The capacitance of the line is proportional to the length of the transmission line. Their effect is negligible on the performance of lines with a short length and low voltage. In the case of high voltage and long lines, it is considered as one of the most important parameters.
The performance of a transmission line is governed by it's four parameters namely series resistance Rand inductance L, shunt capacitance Cand conductance G. The resistance R is due to the fact that every conductor offers opposition to the flow of current.
The power obtained at the receiving end of a transmission line is generally less than the sending end power due to losses in the line resistance. The ratio of receiving end power to the sending end power of a transmission line is known as the transmission efficiency of the line.
Depending on voltage level and construction details, HVDC transmission losses are quoted at 3.5% per 1,000 km (620 mi), about 50% less than AC (6.7%) lines at the same voltage.
AC is much easier (therefore cheaper) to step up and down in voltage(using a transformer) than DC, and can be done more efficiently than the much more expensive and complex DC step-up/step-down systems. That is why AC is used for power transmission.
Most North American transmission lines are high-voltage three-phase AC, although single phase AC is sometimes used in railway electrification systems. DC technology is used for greater efficiency over longer distances, typically hundreds of miles.
