LT Power Cables:
LT Power Cables with PVC or XLPE insulation of voltage conforming TO VARIOUS Indian and International Standard Specifications. Cross Linked Polyethylene (XLPE) XLPE means cross-linked polyethylene or vulcanized polyethylene. The basic material is low density polyethylene.
Polyethylene is a thermoplastic material consisting of long chain of hydrocarbon molecules. At elevated temperatures these molecules tend to move relative to one another so that the material becomes increasingly deformable and will eventually melt at the temperature around 110°C.
By means of process similar to the vulcanization of rubber the polyethylene molecules can be cross-linked. The process of cross-linking or vulcanization consists of producing chemical bonds at interval between the long molecular chain to give a “ladder” effect which prevents slippage between molecules.
As a result of cross-linking the material becomes heat resistant and does not soften at higher temperatures. Further it has better resistance to stress cracking and good resistance to ageing in hot air. With the change of structure there is no adverse effect on electrical properties.
Copper Conductor LT Control Cable
HT Power Cables
HT Power Cables with PVC or XLPE insulation of voltage grade upto 3.3 kv conforming TO VARIOUS Indian and International Standard Specifications.
HT XLPE cable i.e. cross linked poly-ethylene insulated cables which offer on extra ordinary strength to with stand high voltages are used as HT (High tension cables) for underground voltage transmission systems these cables have in place of overhead transmission. These XLPE insulated cables have better electrical, mechanical thermal properties along with its light weight features.
The general construction details are demonstrated in the following tables.
Standards Applicable – IS – 7098 (Part-2), IEC – 60502, BS – 6622.
Construction details for XLPE INSULATED ARMORED and PVC SHEATHED THREE CORE POWER CABLE
- STRANDED COMPACTED CIRCULAR CONDUCTOR
- EXTRUDED CONDUCTOR SCREENING
- XLPE INSULATION
- EXTRUDED INSULATION SCREENING
- METALLIC SCREENING
- FILLERS
- PVC INNER SHEATH (EXTRUDED/TAPE WRAPPED)
- ARMOUR
- PVC OUTER SHEATH
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