Monday, January 12, 2015

H.T. CABLE HT XLPE Cables Construction

H.T. CABLE
HT XLPE Cables Construction
CONDUCTOR
The Conductor is Plain annealed stranded and compacted round Copper in accordance with IEC-60228. Compacting of conductor improves its current carrying capacity, reduces losses and reduces overall cable diameter.
CONDUCTROR SCREEN
An extruded tight fitting layer of Semi-conducting is provided over the copper conductor as the provisions of IEC-60502-2.
INSULATION
The insulation is Cross-linked polyethylene (XLPE) applied by extrusion as per IEC-60502-2.
INSULATION SCREEN
An extruded tight fitting layer of Semi-conducting is provided over the XLPE insulation as the provisions of IEC-60502-2.
METALLIC SCREEN
A metallic screen of copper is provided over insulation screen as per the provisions of IEC-60502-2.
INNER COVERING:
Inner covering of extruded or taped PVC is provided wherever applicable as per IEC-60502-2.
ARMOUR:
Armouring by Round wires or Flat wires or Double tapes. The material of armour for Single core is aluminium whereas, for multi-core cables it is Galvanized Sheet. Counter helix of Galvanized sheet tape is provided on request for round steel wire & Flat wire armoured cables. The armour is applied over the inner covering as per IEC-60502-2.
OVER SHETH:
Over sheath is of extruded PVC as per IEC-60502-2. Special properties for sheath can be provided on specific request, such as FRLS, anti-termite & anti-rodent, resistance to ultraviolet radiation etc.
3 Core Round/Flat Wire HT XLPE Cables
Type: 2xSEYRGY/2xSEYFGY
Applicable Specification: IEC-60502-2.
Voltage grade 6/10(12) KV.
Construction: Stranded copper conductor, extruded semi conducting conductor screen, XLPE insulation, extruded semi conducting insulation screen, metallic screen of copper, cores laid up with PVC fillers. Extruded PVC Inner covering, Galvanized steel Round/Flat wire armour with counter helix binder tape, PVC over sheathed.
Dimension & Mechanical Data
Nominal conductor cross section
No. of strands in conductor
Nominal thickness of insulation
Steel armour wire Dia.
Nominal
Over Sheath thickness
Approx. Cable Diameter
Approx. weight of cable
mm2
Nos.
mm
mm
mm
mm
kg/km
3x50
19
3.4
2.5
2.7
58.7
6108
3x70
19
3.4
2.5
2.7
58.7
7089
3x95
19
3.4
2.5
2.8
52.6
8281
3x120
37
3.4
2.5
2.9
66
9376
3x150
37
3.4
2.5
3.0
69.4
10657
3x185
37
3.4
2.5
3.2
73.1
12084
3x240
61
3.4
3.2
3.4
80.4
15322
3x300
61
3.4
3.2
3.5
85.1
17669
Electrical Data

Nominal conductor cross section
Max. conductor DC resistance @200C
Current rating  @300C in ground
Current rating  @300C in air
Capacitance
Inductance
mm2
Ohm/km
Amps
Amps
micro F/km
mH/km
3x50
0.387
202
218
0.26
0.364
3x70
0.268
249
270
0.29
0.344
3x95
0.193
300
333
0.33
0.327
3x120
0.153
335
378
0.35
0.314
3x150
0.124
381
436
0.38
0.304
3x185
0.0991
421
503
0.42
0.295
3x240
0.0754
488
580
0.46
0.284
3x300
0.0601
525
617
0.50
0.275

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