Underground Cable - znergycable
Underground cables are utilized for power applications where it is senseless, troublesome, or perilous to utilize the overhead lines. They are thoroughly utilized in thickly populated urban locales, in collecting plants, and even to supply control from the overhead presents on the buyer premises.
Advantages of Underground Cables
There are a few points of interest that are related with the laying of particular sorts of links under the ground for reasons for transmitting power. Coming up next is a short framework of these favorable circumstances.
contrasted with overhead cables underground cables are significantly more secure. this is on the grounds that underground electrical cables are not presented to the numerous risks that overhead power cables are presented to.
Underground transmission of power is related with dependability. This is on account of cases of steady interruption in the supply of intensity because of tempests or flaws that are related with overhead transmission lines are not basic when control transmission lines are laid underground.
Underground Cables are the cables buried under the ground. They are like cables over head but even they distribute electricity and telecommunications. But like overhead ones there are less chances of fault, voltage drops and maintenance costs. An underground cable route incorporates a large number of components: cable joints, cable transfer stations and, in the case of AC lines, reactive-power-compensation equipment.
The principal insulating materials used in underground cables are rubber, vulcanised India rubber,impregnated paper, varnished cambric and polyvinyl chloride and should possesses the following properties
(i) High protection and resistance to avoid leakage current.
(ii) High dielectric strength to avoid electrical breakdown of the underground cable.
(iii) High mechanical strength to withstand the mechanical handling of underground cables
(iv) it should not absorb moisture from air or soil. The moisture tends to decrease the insulation resistance and may destroy the cable
(vi) low cost
(vii) they should be unaffected from acid and alkalies to avoid any chemical action.
Although you cannot get all the properties in one underground cable so the selection of the cable depends upon the purpose of requirement.
Construction of Underground Cables
The inner core has a stranded conductor covered by a conductor screen which is headed by an insulation and an insulation screen. Over it there is a metallic sheath and bedding covered with armouring and serving ahead.
Underground Cables are classified as low medium and high voltage further classified as
* Belted cables
* Screen cables
* Pressure cables