The underground wire and cable can be used to transmit both data and electrical power but they come with some standards and regulations regarding the installation and manufacturing.
Underground Cable
From a great distance, it is possible to make out overhead lines crisscrossing the terrain in many places.
Underground cables have a significant advantage over other types of cable in this respect.
Despite this, the transmission mechanism is not fully undetectable: a protection strip must be kept clear of plants and shrubs with extensive roots, and there must be any buildings constructed above or to the side of the underground cable trench.
In addition, an underground cable route is made up of a great deal of different parts, including the subterranean cables themselves, cable joints, cable transfer stations, and, for AC lines, reactive-power-compensation equipment.
The last component described here is primarily made up of reactors, several of which have already been deployed in a variety of Amprion's substations.
In many ways, reactors can be compared to very big transformers.
We never connect them to the grid unless there is an abnormally high voltage on one of the lines.
The reactors restore the power factor and reduce the voltage that is being transmitted along the line.
In the event that the contrary is true, that is, the voltage on the line is too low, correctional equipment like capacitor banks is utilized in order to rectify the situation.
Underground Cable Best
CABLES LAYEN UNDERGROUND As a Form of Transmission Medium A conductor, an insulating system, a wire screen, and a sheath are the fundamental elements that make up underground cables.
An electric conductor is located at the center of the cable; in the case of extra-high-voltage (EHV) lines, this conductor is often made of copper.
The conductor is encased in an insulating system known as a dielectric, the primary component of which is typically composed of a material such as plastic.
Fault currents are dissipated by an outside copper wire screen, which also serves to keep the electric field contained within the cable.
The outer sheath of the cable acts as a barrier between the cable and any moisture that may be present.
Underground Cable Features
CONNECTORS COMPRISING OF CABLE JOINTS Due to the obvious transportation limitations, cross-country EHV cables can only be supplied to the respective installation locations in sections that are currently around 1,000 to 1,300 meters in length.
This is the case because the sections must be broken up into individual pieces before being transported.
The size of the cable drums that may be transported by truck is restricted in some places due to the presence of bridges and other structures.
As a consequence of this, the portions of these cables ought to be connected using cable joints whenever they are laid out.
Underground Cable Uses
Certain joints provide access to the internal connections from the exterior of the component, which enables electrical measurements to be carried out whenever they are deemed essential.
STATIONS FOR THE TRANSFER OF CABLES IN ORDER TO CONNECT TO THE GRID We construct what are known as "cable transfer stations" in the areas where the cables are either laid underground or brought back up through the surface again.
These are necessary in order to connect the cables buried beneath to the wires strung above ground.
A station like this is quite comparable to a more modest substation.
Reactors are needed to rectify the power factor in the AC grid whenever there is a segment of wire that is very long.
In addition to this, they call for additional switch gear, which necessitates a larger footprint, which in turn necessitates a larger footprint for the transfer station in its whole.
MEDIA USED FOR THE INSULATION OF UNDERGROUND CABLES Plastic is employed as an insulation medium in virtually all underground cables used in today's AC grid (dielectric).
Underground cables that use a plastic dielectric have been successful in becoming the industry standard.
