permissible tensile strength
By pulling the conductors with pulling head (not
for armoured cables)
P No. The inner
diameter the conduit should least 1,5 times that
of the diameter the cable. must ensured that the cables should not
be pulled over the hard sharp edges. Single
conductor cables are normally arranged trefoil
touching triangular shape.
Kind of
voltage test
Voltage test 36
in kV
Voltage test 76
in 108
U
0
/U
=
6/10
kV
U
0
/U
=
12/20
kV
U
0
/U
=
18/30
kV
U
0
/U
=
6/10
kV
U
0
/U
=
12/20
kV
U
0
/U
=
18/30
kV
MEDIUM VOLTAGE POWER CABLES
XLPE-insulated 6/10 kV, 12/20 kV, 18/30 kV
.
Bending radius
During the laying XLPE cables, the bending radius
should not below the following values:
• Cable without metal sheath cable Ø
• Cable with Alu-laminated sheath cable Ø
Temperature range
During the installation, the temperature should not be
below the following values:
• for XLPE-insulation PVC sheath 5°C
• for XLPE-insulation sheath –20°C
Max.
Test voltages
Kind Voltage test kV
voltage test
Voltage test 45
Voltage test 144
Voltage test 54
(voltage test 1000 h)
Voltage test cable system
During the operation after laying the medium
voltage power cables, the dielectric can tested with
alternating direct current.
After cutting the length both ends must be
sealed immediately.
The cable ends must water-tight-sealed.584
Laying Cable
In order avoid any damage, the XLPE-insulated
medium voltage cables should carefully laid and
installed. cores conductor cross-section permissible pulling tension N/mm2
– For Cu-conductor: N/mm2
– For Alu-conductor: N/mm2
Current carrying capacity
according VDE 0276 part 620 620 S2
Laying earth (ground)
• Laying depth 0,7 0,8 m
• Earth temperature
in the laying depth 20°C
• Specific heat resistance 1,0 m/W
• Load factor 0,7 (EVU-Load)
Laying air
• Air temperature 30°C
• Load factor (permanent load) 1,0
Laying conduits
Cables for conduit systems laying earth, reduction of
the current carrying capacity with factor of
0,85 recommended.
For laying conduits, the influence thermal
insulation air space between the cable and the inner
wall conduit should specially considered.
A laying depth recommended. The test duration continues
30 minutes
