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| XLPE-INSULATED POWER
CABLES - TECHNICAL INFORMATION |
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| MEDIUM
VOLTAGE POWER CABLE
- OVERVIEW |
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THE EXCLUSIVE IMPORTER
OF 
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Medium Voltage Power Cables, XLPE-insulated |
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Since about
1970 the cross-linked Polyethylene (XLPE)
-insulated power cables have been used in
Germany. This insulation possesses very good
electrical, mechanical and thermal characteristics
in medium voltage networks. This type of
insulation is excellent chemical resistant
and and also resistant to cold temperatures.
Due to various advantages, the XLPE-insulated
type has vastly displaced the traditional
classic paper-insulated types in many sectors.
In order to
prevent the penetration of moisture and also
to extend the duration of life, the XLPE
insulated medium voltage cables are designed
with longitudinally water proof shielding
including an additional swell tape and PE
outer jacket.
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The manufacture of this jacket is based on
high density polyethylene (HDPE), in which
an additive organic peroxide is mixed. Due
to the heating and pressure the molecule
chains are joined together, assuring the
transition from thermo plastic to elastic
condition.
In comparison to PVC and paper-insulated
cables, the advantage of XLPE-insulated medium
voltage power cables is that they are possessing
a low dielectric factor, such as it is 100
times smaller than of PVC-insulated cables.
Moreover, a better dielectric constant value
has has an effect on the low mutual capacitance,
the short circuit to ground and the charging
current of XLPE-insulated cables.
The good properties of these cables remain
constant at a wide temperature range. |
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| Characteristics
of XLPE |
to
top  |
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| Permissible
operating temperature: |
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| For permanent
(normal) operation: |
+ 90°C |
| In short circuit: |
+250°C |
| In overload operation
and damage by sea: |
up
to +130°C |
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| Specific
heat resistance: |
3.5 K
x m/W |
| Dielectric
constant: |
2.4 |
| Specific
resistance (20°C): |
min. 1016 Ohm
x cm |
| Loss factor
(tan δ) (20°C): |
max. 0.5 x 10-3 |
| Density: |
0.92 g/cm3 |
| Breaking
strength: |
min. 200% |
| Tensile strength: |
min. 12.5 N/mm2 |
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Conductor & Inner
Semi-conducting Layer
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to
top |
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Conductor
- Copper or Aluminum, round, multi-wire
stranded and compact, according to
VDE 0295 and HD 383.
Inner Semi-conducting Layer
- Semi-conducting compound, cross-linked,
min. wall thickness 0.3 mm.
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- Cross-linked Polyethylene
(XLPE), compound type 2XI1 according
to DIN VDE 0207 part 22 an HD 620.1
- Insulation nominal wall
thickness
| 6/10
kV |
= |
3.4
mm |
| 12/20
kV |
= |
5.5
mm |
| 18/30
kV |
= |
8.0
mm |
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| Outer
Semi-Conducting Layer |
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- Outer semi-conducting layer
is extruded together with the
inner semi-conducting layer and
the insulation in one working
process and are spliced with
each other
- Semi-conducting compound, cross-linked,
wall thickness 0.3 to 0.6 mm
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| Concentricity
of Conductor |
to
top |
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- The difference between the maximum
and minimum value of 0.5 mm should not
be exceeded.
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- Over the outer semi-conducting layer,
a semi-conducting tape must be used.
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- Shielding of copper wires must have
a minimum diameter of 0.5 mm and over
that a copper tape applied helically
with a minimum thickness of 0.1 mm.
- Copper cross-section according to DIN
VDE 0273 and 0276.
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- Over the shielding as well as under
the outer jacket a separating layer must
be used (e.g. tape).
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- PE compound DMP2 according to HD 620.1
and 2YM3 to DIN VDE 0276 part 3, black,
or
- PVC compound DMV6 according to HD 620.1
and YM5 to DIN VDE 0207 part 5, red
- Wall thickness = 2.5 mm, for 1 x 500
mm2 / 30 kV = 2.6 mm
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In order to avoid any
damage, the XLPE insulated medium voltage
power cables should be carefully laid and
installed. It must be ensured that the
cables should not be pulled over hard or
sharp edges. The cable ends must be sealed
water-tight. After cutting the length both
ends must be sealed immediately.
An installation depth of 60 to 80 cm is recommended.
Single conductor cables are normally arranged
in a trefoil touching or triangular shape.
For installation in conduits, especially
the influence of thermal insulation of air
space between the cable and the inner wall
of the conduit should be considered. The
inner diameter of the conduit should be at
least 1.5 times that of the diameter of the
cable. |
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During the installation
of XLPE cables, the bending radius should
not be below the following values:
| Cable
without metal jacket |
= |
15
x cable Ø |
| Cable
with aluminum-laminated jacket |
= |
30
x cable Ø |
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During the installation,
the temperature should not be below the
following values:
| For
XLPE insulation + PVC jacket |
= |
- 5°C |
| For
XLPE insulation + PE jacket |
= |
-20°C |
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| Max.
Permissible Tensile Strength |
to
top |
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By pulling the conductors
with a pulling head (not for armored cables)
P = No. of conductors x conductor cross-section
x δ
δ = permissible pulling tension N/mm2
| - for copper conductor: |
50 N/mm2 |
| - for aluminum
conductor: |
30 N/mm2 |
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| Current
Carrying Capacity |
to
top |
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according to VDE 0276
part 620, -5C or HD 620 S1 |
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| Laying depth: |
0.7 - 0.8 m |
| Ground temperature
in laying depth: |
20°C |
| Specific heat resistance: |
1.0 K m/W |
| Load factor: |
0.7 (EVU-load) |
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| Air temperature: |
30°C |
| Load factor (permanent
load): |
1.0 |
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| Installation
in Conduits |
to
top |
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Cables for conduit system
installation in ground, a reduction of
the current carrying capacity with a factor
of 0.85 is recommended. |
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| Kind
of Voltage Test |
Voltage
Test in kV |
| U0/U
= 6/10 kV |
U0/U
= 6/10 kV |
U0/U
= 6/10 kV |
| Voltage Test a.c.
in kV |
15 |
30 |
45 |
| Voltage Test d.c.
in kV |
48 |
96 |
144 |
| Voltage Test a.c.
(1000 h) |
18 |
36 |
54 |
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| Voltage
Test of Cable System |
to
top |
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During the operation
or after installing the medium voltage
power cables, the dielectric can be tested
with alternating or direct current. The
test duration continues 30 minutes.
| Kind of Voltage
Test |
U0/U
= 6/10 kV |
U0/U
= 6/10 kV |
U0/U
= 6/10 kV |
| Voltage Test a.c.
in kV |
12 |
24 |
36 |
| Voltage Test d.c.
in kV |
34
up to 48 |
67
up to 96 |
76
up to 108 |
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