What are Power Cables 5 Different Types of Power Cables
                     
Power cables are utilized for the 
transmission of electric power to 
transmit power from substations to the 
required locations. These cables can be 
installed overhead or underground 
according to the requirements, it is a 
convention of two or more conductors, 
protected with an external coating 
known as insulation. Here are the 
different types of Power Cables:-
 
1. Belted Cables
 
In these cables, the conductors are 
rolled with oil-impregnated paper, and 
then the scores are compiled with filler 
material after that the assembly is 
surrounded by a paper insulating belt. 
They are utilized for voltage range up to 
11kv or could also be used up to 22KV. 
Above 22KV, it might lead to tangential 
stress.
2.  Screened Cables
 
These cables can be used up to the 
voltage ranging to 33KV, and can also be 
extended up to 66KV. Screened type 
cables are distributed into two types they 
are:
 
● H-type cable
 
No paper belt is used in this type of 
cable. Each conductor in this cable is 
shielded with paper and covered with a 
metallic screen known as aluminium foil. 
 
● S.L type
 
The cable is shielded with an 
impregnated sheet and each of them is 
covered with a separate protective lead 
sheath. There's also cotton tape covering 
3 cores together using a proper filler 
material. 
 
The only difference between the cables is 
that a common lead sheath covering all 
the three cores is absent in SL-type 
cables while each core is provided with a 
separate lead sheath. This enables the 
bending of cables as per the 
requirements. 
3. Extra-High Tension Cables
 
In solid cables, there's a diverse 
arrangement for avoiding void formation, 
and enhancing dielectric strength is not 
provided. Those cables can be utilized to 
power flow maximum up to 66 kV level. Well, 
Extra High Tension Cables are aimed at 132 
kV to 275 kV voltage points. 
 
4. Oil-Filled Cables
 
This cable comprises a concentrically 
abandoned conductor but is established 
around a hollow cylindrical steel spiral core. 
The hollow-core acts as a channel for oil in 
the conductors. This type of cable is divided 
into three categories: 
 
● Single conductor channel
● Single core-sheath channel, 
● Three core filler space channels. 
 
5. Gas-Filled Cables
 
These cables are triangular and are inserted 
in steel pipes. Then the tubes are filled with 
nitrogen at 12 to 15 atmospheric pressure. 
Due to such high pressure, there is a radial 
compression that leads to the elimination of 
ionization. 
 
Power Cables can be inducted as durable 
wiring within buildings, concealed in the 
ground, run overhead, or uncovered. 
Termination of these types of cables is simple 
and cheap.