Power Cable

XLPE cables (crosslinked polyethylene-insulated power cables) have excellent electrical characteristics. Laj Group has been suplying large quantities of XLPE cables "perfect dry curing system," in which the insulation is cured and cooled with silicon oil rather than steam or water, is further improving the high quality and reliability of XLPE cables.

Copper-tape-shielded cables are applied only to small earth fault current capacity circuits, under soft conditions. These are the most economical and most easily handled cables.

Wire-shielded cables are easy to handle and have a large earth fault current capacity. They may require a waterproof layer over the wire shield layer, depending on laying conditions.

Triplex-type cables, comprising three sheathed cores, can be supplied to meet your requirements.

Lead-sheathed cables are used in heavy-duty, anti-chemical cables. Lead, a metal possessing good anti-chemical characteristics, protects cable insulation completely from water and damaging substances. Care should be taken, however, because the lead sheath is not resistant to mechanical shocks.

Aluminum-sheathed cables, having a large earth fault current capacity in their sheaths, offer protection from water and mechanical damages. Corrugated aluminum-sheathed cables are conventionally used for direct burying of cables owing to their flexibility and weight as well as their resistance to damaging substances.

Stainless steel-sheathed cables offer protection from water and mechanical damages. Loss in metallic sheath is lower than that in aluminum-sheathed cables. To increase protection from an earth-fault current, copper wire shielding is applied under the sheath. Mechanical properties of this type of cable are the same as aluminum-sheathed cables.

XLPE cables with huge conductor sizes have been developed for the large current rating cable. Since the huge conductor size imparts a large skin-effect factor to the conductor, actual AC conductor resistance is not decreased as much as by conventional huge conductors. The strand-insulated conductor with cupric oxide film, newly by LAJ GROUP, has a very low skin-effect factor and a high current rating capacity.

These cables have a water-proof layer formed from laminated lead or aluminum tape under the PVC sheath to avoid water penetrating into the cable insulation through the PVC sheath. Such cables have a higher degree of water-proof properties and higher reliability. Cables with a water-proof layer are more easily handled compared with metallic sheathed cables.