High tension (HT) cables is a cable used for electric power transmission at high voltage. In Singapore we use it to convey electric power over moderately long distances, typically from a central production station to main substations. Each cable includes an insulation and conductor, making it suitable for underwater or underground usage.More Information
High voltage cables are different from lower voltage cables in that the have additional internal layers in the insulation jacket to control the electric field around the conductor. There are many types of HT cables and the diverse range of cables comprises of applications in alternating current (AC) and direct current (DC) power transmission, ignition systems and instruments.
The main benefit of high tension cables is that huge amounts of current can be transferred at reasonably low currents. This is one of the reasons high tension cables are used in the first place.
While high tension alone is not dangerous, the transmission lines are very hazardous. One has to consider the amount of current flowing through them. The high tension cable allows electricity to invigorate the air which surrounds the conductor and enables it to “jump”, so even being close to them is tremendously risky.
This is why it’s never a decent idea to get close to a power line laying on the ground, especially if it is energized. Because high voltage allows the current to arc over the air, transmission lines must be appropriately insulated to stop the current from “leaking” onto their pylons.