Different Types of Cables

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 Different Types of Cables

Low Tension Cable: These cables are used for voltage levels upto 6.6kV. Paper is used as insulatuion in these type of cables. Over this paper insulation another insulation of impregnated paper is provided after that lead sheath, bedding, aromouring and serving are provided.

Single Core LT Cable

Medium and High Tension Cable: These are Three core cables i.e. multi core cables and are used for voltage upto 66kV. It is of two types, belted cables and screened type cables. The screened type cables are further divided into H-type Cables and S-L (Seperate Lead) type Cables.

Belted cables: These cables are used for voltage level up to 11kV. The cores are not circular in shape and insulation present is of impregnated paper and these cores are belted together with help of paper belt. Gaps are filled with fibrous material like jute and then it is covered with sheath and other things.

Screened type cables: These cables are used for voltage levels upto 22kV – 33kV In H-type cable there is no paper belt used and each conductor is insulated with paper covered with metallic screen of aluminum foil. In Sl- type, each core is first insulated with impregnated paper and then with separate lead sheath.

Super Tension Cable: These are used for voltage levels upto 132kV to 275kV. It is also of two types:

Oil filled Cable: In this the ducts are provided within or adjacent to the cores through which oil under pressure is circulated. It has concentric stranded conductor, built around a hollow cylicndrical steel spiral core. This hollow core acts as channel for oil.

OIl filled Cables

Gas Pressure Cable: In this a inert gas like nitrogen at high pressure (12-15atm) is introduced. There is no bedding and serving in this cable. The working power factor of these type of cables are high.

Gas Pressure Cable

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