Modern trend is to use extra high voltage (EHV) and ultra-high voltage (UHV) for transmission of huge blocks of power over long distances. The reasons for adopting of EHV/UHV range for transmission purposes are given below: 1. Reduction of Electrical Losses, Increase in Transmission Efficiency, Improvement of Voltage Regulation and Reduction in Conductor Material Requirement: For transmission of given amount [...]
The major problems associated with EHV transmission are discussed below: Problem # 1. Corona Loss and Radio Interference: The corona is not only a source of power loss but it is also a source of interference with radio and television. The corona loss depends on various factors such as system frequency, system voltage, air conductivity, air density, conductor radius, conductor [...]
There are certain limitations in the transmission of power by EHV ac system. These limitations and design aspects are discussed below: 1. Stability Considerations: Power transferred is expressed as: if resistance and shunt leakance of the transmission line are neglected. For equal terminal voltages (i.e. VS = VR = V) Maximum steady state transfer of power takes place theoretically for [...]