Transmission of electrical energy from one place to another require a lot of cabling throughout the area. In the transmission from electrical energy grid to the place at which it is used domestically. Different types of cabling are used. These cables are actually characterized on the basis of voltages.
Following are the different types of tension cables used in electricity transmission.
- Low tension cable
- High tension cable
- Super tension cable
- Extra high tension cable
- Extra super voltage power cable
In this article, the major emphasis would be on the low tension cables.
Introduction of low tension cable
Low tension cables are used for transmitting the voltages below than 1 KV. Because the cable is not prone to any special electrostatic stress its construction is kept normal. Even the insulation is very simple in which a paper is impregnated using oil. Its viscosity increases by applying the resin and it also avoids damage. Over the outer sheath layer, there is another layer which keeps the cable protected from moisture and any environmental damage.
There are two more types of low tension cable which are as follows.
- Single-Core Cable
A stranded circular core which is insulated with lead sheath. The lead sheath prevents any moisture penetration in the cable. Above the lead sheath, there is another layer which prevents the metal from corrosion. In these cables, no armoring is done during its manufacturing because the armor becomes a reason of excessive loss.
- Multicore Cable
A three core cable insulated with each other. The strands of the conductor are either circular shaped, oval or section-wise these are insulated using impregnated paper. Similar to the single core cable, the insulation is provided on each belt of the core. This outer covering prevents the penetration of moisture in the cable. A coating of lime water is also provided on the outer layer to avoid the cable to act adhesive.