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European Medium Voltage Power Cables, XLPE-Insulated

Hi-Tech Controls, Inc, European wires and cables

 

Technical Information & Introduction
Introduction Introduction Cable Installation Cable Installation
Characteristics of XLPE Characteristics of XLPE Bending Radius Bending Radius
Conductor & Inner Semi-conducting Layer Conductor & Inner Semi-conducting Layer Temperature Range Temperature Range
Insulation Insulation Max. Permissible Tensile Strength Max. Permissible Tensile Strength
Outer Semi-Conducting Layer Outer Semi-Conducting Layer Current Carrying Capacity Current Carrying Capacity
Concentricity of Conductor Concentricity of Conductor Installation Underground Installation Underground
Semi-Conducting Type Semi-Conducting Type Installation Outdoors Installation Outdoors
Shielding Shielding Installation in Conduits Installation in Conduits
Separator Separator Test Voltage Test Voltage
Outer Jacket Outer Jacket Voltage Test of Cable System Voltage Test of Cable System

 

Product Selection
Medium Voltage Power Cables: Index Medium Voltage Power Cables: Index
Power, Underground Cables & Ground Conductors Power, Underground Cables & Ground Conductors
Gas Station Cables Gas Station Cables
Power Cables up to 30 kV, XLPE-insulated Power Cables up to 30 kV, XLPE-insulated

Introduction
European
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 has excellent chemical resistance and is 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. DATAFLAMM halogen-free, RoHS Compliant, RoHS Approved, Hi-Tech Controls, European  , Halogen-free Security Cables
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 waterproof shielding including an additional swell tape and PE outer jacket.

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 possess 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.
Characteristics of XLPE
 
Permissible operating temperature:
 
For permanent (normal) operation: + 90°C/+194°F
In short circuit: +250°C/+482°F
In overload operation and damage by sea: up to +130°C/266° F
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
Conductor & Inner Semi-Conducting Layer
 

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.
Insulation
 
  • 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
Outer Semi-Conducting Layer
  • 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
Concentricity of Conductor
 
  • The difference between the maximum and minimum value of 0.5 mm should not be exceeded.
Semi-Conducting Type
 
  • Over the outer semi-conducting layer, a semi-conducting tape must be used.
Shielding
 
  • 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.
Separator
 
  • Over the shielding as well as under the outer jacket a separating layer must be used (e.g. tape).
Outer Jacket
 
  • 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
Cable Installation
 

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.

Bending Radius
 

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
Temperature Range
 

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
Max. Permissible Tensile Strength
 

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
Current Carrying Capacity
 

According to VDE 0276 part 620, -5C or HD 620 S1

Laying Underground
 
Laying depth: 0.7 - 0.8 m
Ground temperature in laying depth: +20°C/+68°F
Specific heat resistance: 1.0 K m/W
Load factor: 0.7 (EVU-load)
Outdoor Installation
 
Air temperature: +30°C/86°F
Load factor (permanent load): 1.0
Installation in Conduits
 

Cables for conduit system installation in ground, a reduction of the current carrying capacity with a factor of 0.85 is recommended.

Test Voltages
 
Kind of Voltage Test Voltage Test in kV
U0/U = 6/10 kV U0/U = 12/20 kV U0/U = 18/30 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
Voltage Test of Cable System
 

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 = 12/20 kV U0/U = 18/30 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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