High Voltage

 

Feature
These cables are applied for underground cable up to 275 kV

CONSTRUCTION 

Conductor
Circular stranded or circular compressive stranded, or Milliken of annealed copper conductor.

Conductor
Screen Extruded Semi-conducting compound. Minimum thickness 0.5 mm and the maximum volume resistivity of 5000 ohm-an at 20° C and 25000 ohm-cm at 90° C.

Insulation 
Extruded Super Clean Natural XLPE with high degree of cross-linking, free from contaminants, air voids and heat resistant by dry cured process.

 

Type : N2XCK2Y
N2XCK(Br)2Y
Nominal Voltage : 38/66 (72.5) kV
76/132 (145) kV
87/150 ( 170 ) kV
160//275 (300) kV
Specification : IEC 60840
(Other Type, Voltage, Specifications are availible upon request)

 

Table 1. Insulation Thickness

 

Insulation Screen
Extruded Semi-conducting compound. Minimum thickness 0.5 mm and the maximum volume resistivity of 5000 ohm-cm at 20°C and 25000 ohm-cm at WC The screen is tightly fitted to insulation to exdude all air voids and can be easily hand stripped on site.

Conduction Water Blocking Layer
Semi-conductive water blocking tape provided over the insulation screen which will swell up under the influence ofmoisture or water.

Metallic Screen
Copper wires applied over the conducting water blocking layer. Copper tape with minimum thickness 0.1 mm and maximum 0.3mm applied over copper wires.

Metallic Sheath
Lead alloy grade E or 0.5C applied over the water blocking layer. 

Water Blocking Layer
Bitumen provided the metallic screen which will swellup to blocking moisture or water.

Outer Sheath
Extruded HDPE , suitable tar exposure to sun-light or other local atmospheric environments and for the operating temperature of the cable.