These cables are applied for underground cable up to 275 kV
Circular stranded or circular compressive stranded, or Milliken of annealed copper 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.
Extruded Super Clean Natural XLPE with high degree of cross-linking, free from contaminants, air voids and heat resistant by dry cured process.
38/66 (72.5) kV
76/132 (145) kV
87/150 ( 170 ) kV
160//275 (300) kV
(Other Type, Voltage, Specifications are availible upon request)
Table 1. Insulation Thickness
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.
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.
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.
Extruded HDPE , suitable tar exposure to sun-light or other local atmospheric environments and for the operating temperature of the cable.