Uo/U – 3.6/6 kV, 8.7/15 kV, 20/35 kV IEC 60502-2
The single-core cables with insulation of cross-linked polyethylene (XLPE) are designed for transfer and distribution of electrical power with nominal voltage Uo/U 3.6/6kV; 8.7/15kV Ë 20/35 kV and frequency 50 Hz in urban and district electrical networks and for electrical supply of transformer's substations, small and medium industrial plants.
They are suitable for use in distribution installations, electric power stations and industrial systems. The cables are for fixed assembly in lines with unlimited difference levels, indoor installations, in cable ducts, conduits and shafts, over shelves and grills directly underground in ditch and outdoor shelter
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Cable construction
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Construction
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According to IEC 60502
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Conductor
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Cu and Al stranded compacted, according to IEC 60228 class 2
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Inner semi-conductive layer
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semi-conductive XLPE compound
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Insulation
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XLPE compound
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Outer semi-conductive layer
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semi-conductive XLPE compound and semi-conductive tape or extruded semi-conductive XLPE compound
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Metal screen
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Cu wires concentrically laid and one contact of Cu tape with thickness of 0.1mm.
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Separating layer
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Layer of plastic tape
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Sheath
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PE compound
type ST7 according to IEC 60502
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Color
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black
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Technical data
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Conductor resistance at 20°C
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According to BDS904
(IEC60228) class 2
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Operating temperature
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90°C continuous operation
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Overload temperature
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130°C /100h per year max./
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Short circuit temperature
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250°C /5 s max./
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Nominal voltage Uo/U:
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6/10;12/20 kV
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Highest system voltage
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6/10; 12/20 kV
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Uo/U, no more than
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12kV; 24kV kV
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Test voltage Uo/U
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6/10; 12/20 kV
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AC (≈) – 5 min
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15kV; 30kV kV
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DC (=) – 15 min
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48kV; 96kV kV
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Level of partial discharge at 2*Uo
Bending radius, min
Temperature of laying
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max. 5 pC
15x D cable
no less than – 20°C
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Temperature of
exploitation
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-30 to 50°C
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Tests
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according to IEC 60502-2 or
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Force of strain in laying N max.
where:
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Al cores – 30*n*S core Cu cores – 50*n*S core n- number of cores and
-S-cross-section of
conductors in mm
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