Question

What is the maximum length of underground cable and its voltage?

Answer 1

Underground cables offer an affordable and justifiable solution for critical parts and in some cases the entire length of overhead high voltage power lines. ... of the current carrying capacity for Indian conditions, which is based on a maximum conductor temperature of 80 °C for 11KV cablesand above. The circuit installation also includes grounding boxes, screen earthing connection boxes and the related earthing and bonding cables. Uo = 130 kV phase-to-ground voltage,. U = 225 kV rated phase-to-phase voltage,. Um = 245 kV highest permissible voltage of the grid. High voltage underground power cables. 6.

Answer 2

Answer:

For installation up to $30$ m for $400$ KV, underground cables need a tighter surrounding strip of roughly $1-10$ metres, whereas an overhead line needs a permanent clear zone around it that is $20-200$ metres wide for safety, maintenance, and repair.

Explanation:

A high conductivity conductor or conductors, such as copper or aluminium, which can handle high voltage, make up an underground cable. A layer of insulation surrounds the core, which helps prevent leakage and provides a high level of safety.

At a recommended operating temperature of $95$ to $105$ °C, the cable's anticipated lifetime is $7$ to $30$ years. There are numerous characteristics that can be used to categorise underground wires, including:

• How many conductors are in the cable?
• Rating of the cable's voltage.
• Cable construction.
• The kind and extent of the insulation utilised.
• Putting in place and laying the cables.

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