Construction of Cable and It's Classification is given below in detail
Construction of Cable and It's Classification |
- A cable is the made by solid conducting material i.e. copper or aluminium and it's coated by insulation material.
Construction Of Cable
- Cable is construct by various parts which is mentioned below:
- Conductor
- Insulation
- Metallic sheath
- Bedding
- Armouring
- Serving
- Description of all the parts is described below in detail..
1. Conductor
- The main function of conductor is to carry the current in such a manner.
- There are different types of conductor are used i.e copper, aluminium, tin, etc..
- We can use gold and silver, but these metals are very costly.
2. Insulation
- Insulation is required between the conductor and earth.
- There are different types of insulation are used such that PVC, paper, varnished rubber, metalized paper, etc...
- Insulation protect the conductor.
3. Metallic sheath
- Moisture is effect the insulation, because of moisture electric strength will be decreases.
- So it should be required that the moisture does not enter into insulation.
- To avoid this effect, Sheath of lead is provided over the insulation.
- If we used copper conductor then aluminium sheath is provided over the insulation.
4. Bedding
- Bedding is used for protect the sheath from mechanical damage.
5. Armouring
- Armouring protect the cable from mechanical damage.
- To protect this two layers of galvanized steel wires are wound on the bedding.
6. Serving
- Serving is the layer of jute which is provided on the armouring.
Classification of Cables
- Cable can be classified according to different bases. It can be classified below.
According to bases of number of core
- 1 core cable
- 2 core cable
- 3 core cable
- 3 (1/2) core cable
- 4 core cable
According to bases of voltage
- Low tension cable ( operating voltage upto 1000 V)
- High tension cable ( operating voltage upto 11000 V)
- Super tension cable ( operating voltage upto 33000 V)
- Extra High tension cable ( operating voltage upto 66000 V)
- Extra super voltage cable ( operating voltage upto 132000 V)
According to bases of application
- Power cable ( for the transmission and distribution of power)
- Control cable ( For transmission of control signal)
According to bases of insulation
- Paper insulated cable
- PVC insulated cable
- Polithelene insulated cable
- Rubber insulated cable
- Varnished cambric insulated cable
According to bases of sheath
- Aluminium sheathed cable
- PVC sheathed cable
- Lead sheathed cable
- Lead alloyed sheathed cable
According to bases of armouring
- Single layer steel wire armoured
- Double layer steel wire armoured
- Double layer steel tape armoured
According to bases of construction
- Low tension cable
- Screened or H type cable
- SL type cable
- HSL type cable
- Belted cable
- Super tension cable
- A. Oil filled cable
- B. Gas pressured cable
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