1- HT cable or high voltage cable:

HT- high tension or high voltage cable is used in premises, substations etc. HT cables is the medium of high voltage carrying from HT overhead line to substation or premises HT panel. It can be categorized s per voltage low voltage, Medium voltage, Extra high voltage.

2- Types of HT Cable:

High voltage cable is three type, low voltage, medium voltage and EHV- Extra high voltage.

A - Low Voltage HT Cable:

1.1 KV upto 3.3 KV high voltage is used as low voltage HT Cable.

1- According Core:

• single core:
• three core:

2- According Metal:

• Copper:
• Aluminium:

3- According size:

• Single core : 10 sq.mm to 1000 sq.mm
• Three core : 6 sq.mm to 630 sq.mm

4- According insulation:

• PVC :
• XLPE :

5- According Mechanical strength :

• Armoured:
• Unarmoured :

B- MV- Medium Voltage HT cable:

3.3 KV to 36 KV high voltage is used as medium voltage HT Cable.

1- According Core:

• single core:
• three core:

2- According Metal:

• Copper:
• Aluminium:

3- According size:

• Single core : 25 sq.mm to 1000 sq.mm
• Three core : 25 sq.mm to 400 sq.mm

4- According insulation:

• XLPE :

5- According Mechanical strength :

• Armoured:
• Unarmoured :

C- EHV-Extra High Voltage HT Cable:

66 KV to 220 KV high voltage is used as medium voltage HT Cable.

1- According Core:

• single core:

2- According Metal:

• Copper:
• Aluminium:

3- Cable size according copper conductor:

• 38/66 KV (72.5 KV)voltage : 240 sq.mm to 2500 sq.mm
• 64/110 KV (123 KV) voltage : 240 sq.mm to 2500 sq.mm
• 76/132KV (145 KV) voltage : 300 sq.mm to 2500 sq.mm
• 127/220KV (245 KV) voltage : 400 sq.mm to 2500 sq.mm

4- Cable size according Aluminium conductor:

• 38/66 KV (72.5 KV)voltage : 400 sq.mm to 2500 sq.mm
• 64/110 KV (123 KV) voltage : 400 sq.mm to 2500 sq.mm
• 76/132 KV (145 KV) voltage : 400 sq.mm to 2500 sq.mm
• 127/220 KV (245 KV) voltage : 400 sq.mm to 2500 sq.mm

5- According insulation:

• XLPE :

6- According Mechanical strength :

• Armoured:
• Unarmoured :

3- Parts of HT cable:

1- Conductor:

Two type conductor re used, copper nd aluminium in HT cable. Both conductor are used for single core and three core.

2- Conductor Screening:

Screening are used for avoiding cavities and formation of dielectric particulars during bending process in XLPE cable. conductor is screened with extruded semiconducting compound

3- Insulation:

Two type insulation are used as PVC and XLPE

4- Insulation Screening:

Screening are used for avoiding cavities and formation of dielectric particulars during bending process in XLPE cable. insulator is screened with extruded semiconducting compound tape.

5-Inner sheathing:

Inner sheath is made with high quality PVC and it is used for protection of hard armour steal wire.

6- Armouring:

Armouring is used for mechanical protection of HT cable.

7- Outer sheath:

Outer sheath is made with PVC or polymer and it is used for protection from atmosphere.

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