HT Cables

HT (High Tension) Cables are used in the power sector to transmit electricity at high voltages, typically ranging from 1.1 kV to 33 kV. They are primarily used for supplying power from substations to large industrial units, commercial complexes, and distribution networks over long distances. Designed to handle high voltage loads, HT cables are built with strong insulation and protection to ensure safety, efficiency, and minimal power loss during transmission.

The chemical composition of High Tension (HT) cables is designed to handle higher voltages and ensure enhanced durability and insulation. The conductor is typically made of high-purity copper (about 99.9%) or aluminum (around 99.5%), chosen for excellent conductivity. The primary insulation layer is usually made of cross-linked polyethylene (XLPE), which makes up approximately 65–75% of the cable and provides superior thermal and electrical resistance. The outer sheath is often made from PVC or Low Smoke Zero Halogen (LSZH) materials, contributing around 15–25% to the total composition. HT cables also include semi-conducting screens over the conductor and insulation, made from carbon-loaded polymer compounds (about 5–10%), to control electrical stress. If armoring is required, it typically consists of galvanized steel wires or tapes (Fe), which make up 10–20%, providing mechanical protection. Also fillers, binders, and anti-oxidant additives may contribute another 5–10% to ensure stability and performance in demanding conditions.