Medium Voltage Cable Construction and Followed Standard

Medium Voltage Cable Cross-section

CABLE CONSTRUCTION AND THEIR STANDARD

Medium voltage cables are normally designed based on IEC 60502-2, SPLN 43-5 or others international standards upon request.

CONDUCTOR

The conductor made from annealed copper wire, circular stranded compacted or round sentimental compacted according to IEC 60228, BS 6360, AS 1125 or SPLN41-1.

CONDUCTOR SCREEN
The conductor screen made from extruded semi conductive compound.

INSULATION

The conductor screen are covered with an extruded layer of XLPE compound according to IEC 60502, AS 1429-1, BS 5464 or SPLN 41-9.

INSULATION SCREEN

The insulation screen made from extruded semi-conductive compound in combination with the metallic screen. The metallic screen consist of a layer of either copper tape or copper wires with copper tape binder. Conductor screen, insulaton and insulation screen are produced by triple extrusion with N2 gas drying curing.



BEDDING/FILLER

The bedding and/or filler made from an layer of extruded PVC or non-hygroscopic material which compatible with the insulation and operating temperature of the cable.

METALLIC SHEATH

The metallic sheath made from lead alloy material with kinds of grade such as 1/2 C, E grade. The main function of lead sheath is to protect the cable from physical deterioration caused by chemical liquid such as sulfides , waste oil and to provide an impermeable water barrier.

INNER SHEATH 

The inner sheath made from a layer of extruded PVC ST2 type to IEC 60502-2 or YM/2 type to SPLN 41-2 , type 9 to BS 7655 or other international standards.

ARMOURING

The armouring made from either welded continuously aluminium corrugated, galvanized round steel wire, galvanized steel tape, round aluminium wire or aluminium tape.

Cables Construction 2



OUTER SHEATH
The outer sheath made from a layer of extruded Polyethylene or PVC ST2 type to IEC 60502-2 or YM/2 type to SPLN 41-2 , type 9 to BS7655 or other international standards.

An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover. Although several types of underground cables are available, the type of cable to be used will depend upon the working voltage and service requirements.