M3A3B 3*240

Description

Description

Standards

  • International
    IEC 60228; IEC 60332-1-2; IEC 60502-2

1-SCOPE

This specification covers three core armoured cables, rated at 12/20 (24) KV conforming to IEC 60502-2 Specifications.
 

2. CONSTRUCTION

2.1 Conductor

Aluminum conductors, conforming to the applicable requirements of IEC 60228.
 

2.2 Insulation

Extruded inner semi conductive layer, XLPE insulation and  extruded outer semi conductive layer .

 

2.3 Metallic Screen Layer

Copper tape on each core

 

2.4 Separation Sheath

PVC .

 

2.5 Armour

Two layers of black steel tape .
 

2.5 Sheath

PVC .
 

3. TESTS

All tests required by IEC 60502-2 either on Raw material or on finished products.

TEST AT WORKS according to IEC 60502-2 for armored cables

Routine Tests

 -          Max. DC conductors resistance at 20°C acc. to IEC 60228 & IEC 60502-2 parag.16.1 & 16.2

 -          High voltage test acc. to IEC 60502-2  parag. 16.1 & 16.4

 -          Max. partial discharge test  at 1.73 Uo acc. to IEC 60502-2  parag.16.1 & 16.3

Liban Cables will carry out these tests on all the lengths and tests certificates will be provided.

 

Sample Tests

 -          Check of the build - up and color coding of the cable                                                      

 -          Check of dimensions                                                    

            Insulation                      :           according to IEC 60502-2           Parag.  17.5.2

            Separation sheath         :           according to IEC 60502-2           Parag.  17.5.3

            Armouring                     :           according to IEC 60502-2          Parag.  17.7

            Oversheath                   :           according to IEC 60502-2           Parag.  17.5.3

-           Hot Set Test                  :           according to IEC 60502-2           Parag.  17.10

These tests will be carried out on one length of each size during each inspection .

Tests certificates will be provided by Liban Cables

                                                                       

Type Tests

Mechanical characteristics on insulation and sheaths material (tensile strength and elongation at break  ) in accordance with IEC 60502-2.

These tests will be carried out on one length of the order .

Tests certificates will be provided by Liban Cables

Characteristics

Characteristics

Construction characteristics

Construction characteristics

Conductor material
Aluminum
Number of conductors
3
Conductor shape
Circular
Material of the inner semi-conductor
Extruded
Insulation
XLPE
Material of the external semi-conductor
Extruded strippable
Screen
Copper tape
Armour type
Steel tapes
Outer sheath
PVC
Colour
Red
Conductor flexibility
Class 2 IEC 60228

Dimensional characteristics

Dimensional characteristics

Conductor cross-section
240 mm²
Conductor diameter
17.9 mm
Nominal insulation thickness
3.4 mm
Nominal outer sheath thickness
3.3 mm
Nominal outer diameter
68.0 mm
Approximate net weight
5697 kg/km

Electrical characteristics

Electrical characteristics

Test voltage
21 kV
Rated Voltage Uo/U (Um)
6 / 10 (12) kV
Perm current rating in air 30°C
415 A
Permissible current rating when buried
338 A
Max. DC resistance of the conductor at 20°C
0.125 Ohm/km
A.C. Conductor resist. 50Hz and at 90 °C
0.161 Ohm/km
Permissible short circuit current conductor 1s
23.1 kA
Thermal soil resistivity wet zone
1.5 °K.m/W

Mechanical characteristics

Mechanical characteristics

Cable flexibility
7xD
Mechanical resistance to impacts
Good

Usage characteristics

Usage characteristics

Laying depth, center of system
800 mm
Ambient air temperature
30 °C
Ambient ground temperature
20 °C
Max. conductor temperature in service
90 °C
Operating temperature, range
-15 ... 55 °C
Short-circuit max. conductor temperature
250 °C
Flame retardant
IEC 60332-1-2

Resources

Resources

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