High voltage DC transmission towers

High voltage DC transmission towers

High-voltage direct current(HVDC) transmission lines are either monopolar or bipolar systems. With bipolar system, a conductor arrangement with one cocnductor on each side of the tower is used.

On some schemes, the ground conductor is used as electrode line or ground return. In this case, it had to be installed with insulators equipped with surge arrestors on the pylons in order to prevent electrochemical corrosion of the pylons. For single-pole HVDC transmission with ground return, towers with only one conductor can be used. In many cases, however, the towers are designed for later conversion to a two-pole system. In these cases, often conductors on both sides of the tower are installed for mechanical reasons. Until the second pole is needed, it is either used as electrode line or joined in parallel with the pole in use. In the latter case, the line from the converter station to the earthing (grounding) electrode is built as underground cable, as overhead line on a separate right of way or by using the ground conductors.

Electrode line towers are used in some HVDC schemes to carry the power line from the converter station to the grounding electrode. They are similar to structures used for lines with voltages of 10–30 kV, but normally carry only one or two conductors.

AC transmission towers may be converted to full or mixed HVDC use, to increase power transmission levels at a lower cost than building a new transmission line.

High-Voltage Direct Current (HVDC) can be transmitted over long-distances with minimal power losses, unlike Alternating Current (AC) electricity.   This means that, once cost-effective infrastructure for HVDC is developed, it will be very beneficial to primarily transmit DC power because transmitting it will cut down on both energy waste and copper use.   Not to mention, when power can more efficiently be distributed to buildings, less electricity needs to be generated to satisfy electrical demands.   When less electricity needs to be generated, less carbon emissions are produced, making DC electricity a significant piece of the puzzle when it comes to meeting global emission reduction targets.

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