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LT Power Cables | HT Power Cables
LT Power Cables
LT Power Cables with PVC or XLPE insulation of voltage grade upto 3.3 kv conforming TO VARIOUS Indian and International Standard Specifications. Cross Linked Polyethylene (XLPE) XLPE means cross-linked polyethylene or vulcanized polyethylene. The basic material is low density polyethylene. Polyethylene is a thermoplastic material consisting of long chain of hydrocarbon molecules. At elevated temperatures these molecules tend to move relative to one another so that the material becomes increasingly deformable and will eventually melt at the temperature around 110°C.
 
By means of process similar to the vulcanization of rubber the polyethylene molecules can be cross-linked. The process of cross-linking or vulcanization consists of producing chemical bonds at interval between the long molecular chain to give a "ladder" effect which prevents slippage between molecules. As a result of cross-linking the material becomes heat resistant and does not soften at higher temperatures. Further it has better resistance to stress cracking and good resistance to ageing in hot air. With the change of structure there is no adverse effect on electrical properties.
 

Dimension of 3 ½ Core, Aluminium PVC Armoured Power Cables

Type No. of Cores & Cross Sectional Ara Min. No. of Wires Thickness of PVC Insulation (Nom.) (mm) Overall Diameter (Approx.)
(mm) 		Approx. Net Wt. of Cable Max. D.C. Resistance at 20 Ohms/km
Strip Armour Wire Armour Strip Armour Wire Armour
Aywy/Ayfy 3.5Cx25/16 6/6 1.2/1.0 25.0 26.5 1000 1260 1.2000
Aywy/Ayfy 3.5Cx35/16 6/6 1.2/1.0 26.0 27.5 1170 1450 0.8680
Aywy/Ayfy 3.5Cx50/25 6/6 1.4/1.2 29.5 31.0 1470 1805 0.6410
Aywy/Ayfy 3.5Cx70/35 12/6 1.4/1.2 33.5 36.0 1810 2405 0.4430
Aywy/Ayfy 3.5Cx95/50 15/6 1.6/1.4 37.5 40.0 2305 3015 0.3200
Aywy/Ayfy 3.5Cx120/70 15/12 1.6/1.4 41.0 43.0 2760 3545 0.2530
Aywy/Ayfy 3.5Cx150/70 15/12 1.8/1.4 45.5 48.0 3215 4030 0.2060
Aywy/Ayfy 3.5Cx185/95 30/15 2.0/1.6 50.0 53.5 3900 5300 0.1640
Aywy/Ayfy 3.5Cx240/120 30/15 2.2/1.6 57.0 60.0 4840 6390 0.1250
Aywy/Ayfy 3.5Cx300/150 30/15 2.4/1.8 61.5 66.0 5835 210 0.1000
Aywy/Ayfy 3.5Cx400/185 53/30 2.6/2.0 70.0 75.0 7250 9900 0.0778
 

Copper Conductor LT Control Cable
 

Dimension of Control Cable IS : 1554 (Pt - I) -1988
 UN-ARMOURED ARMOURED Current Rating

No. of Cores & Cross Sectional Area No x mm 2

Thickness of PVC Insulation (Nom.) mm

Thickness of PVC Inner sheath (min.) Extruded mm

Approx. O.D.mm

Approx. Net Weight of Cable Kg/Km

Approx. O.D. mm

Approx. Net Weight of Cable Kg/Km

Direct in Ground Amps

In Air / Duct Amps

2 x 1.5 0.8 0.3 11.8 185 13.6 415 23 20
3 x 1.5 0.8 0.3 12.3 190 14.1 430 21 17
4 x 1.5 0.8 0.3 13.2 225 15.0 490 21 17
5 x 1.5 0.8 0.3 14.1 260 15.9 545 16 14
6 x 1.5 0.8 0.3 15.1 295 16.9 605 15 13
7 x 1.5 0.8 0.3 15.1 315 16.9 630 14 13
10 x 1.5 0.8 0.3 18.4 425 20.6 835 13 11
12 x 1.5 0.8 0.3 18.9 480 21.5 950 12 10
14 x 1.5 0.8 0.3 18.9 480 22.4 1040 11 10
16 x 1.5 0.8 0.3 20.7 595 23.3 1130 11 9
19 x 1.5 0.80 0.3 22.5 720 24.7 1265 10 9
24 x 1.5 0.8 0.3 25.8 880 28.0 1510 9 8
27 x 1.5 0.8 0.3 26.3 960 28.5 1610 9 8
30 x 1.5 0.8 0.3 27.2 1040 29.4 1700 9 7
37 x 1.5 0.8 0.3 29.1 1230 31.3 1960 8 7
2 x 2.5 0.9 0.3 13.0 230 14.8 500 32 27
3 x 2.5 0.9 0.3 13.6 240 15.4 520 27 24
4 x 2.5 0.9 0.3 14.6 290 16.4 590 27 24
5 x 2.5 0.9 0.3 15.7 335 17.5 660 23 19
6 x 2.5 0.9 0.3 16.9 385 18.7 745 21 18
7 x 2.5 0.9 0.3 16.9 420 18.7 780 20 17
10 x 2.5 0.9 0.3 20.8 570 23.4 1110 185 15
12 x 2.5 0.9 0.3 22.2 690 24.4 1240 17 14
14 x 2.5 0.9 0.3 23.3 775 25.4 1340 16 13
16 x 2.5 0.9 0.3 24.3 860 26.5 1455 15 13
19 x 2.5 0.9 0.3 25.5 985 27.7 16.5 14 12
24 x 2.5 0.9 0.3 29.4 1215 32.0 1970 13 11
27 x 2.5 0.9 0.3 30.0 1330 32.6 2100 12 10
30 x 2.5 0.9 0.3 31.0 1450 33.6 2250 12 10
37 x 2.5 0.9 0.4 34.1 1790 37.1 2900 11 9
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HT Power Cables
HT Power Cables with PVC or XLPE insulation of voltage grade upto 3.3 kv conforming TO VARIOUS Indian and International Standard Specifications.
 

HT XLPE cable i.e. cross linked poly-ethylene insulated cables which offer on extra ordinary strength to with stand high voltages are used as HT (High tension cables) for underground voltage transmission systems these cables have in place of overhead transmission. These XLPE insulated cables have better electrical, mechanical thermal properties along with its light weight features.

The general construction details are demonstrated in the following tables.
Standards Applicable – IS – 7098 (Part-2), IEC – 60502, BS – 6622.
Construction details for XLPE INSULATED ARMOURED and PVC SHEATHED THREE CORE POWER CABLE
  1. STRANDED COMPACTED CIRCULAR CONDUCTOR
  2. EXTRUDED CONDUCTOR SCREENING
  3. XLPE INSULATION
  4. EXTRUDED INSULATION SCREENING
  5. METALLIC SCREENING
  6. FILLERS
  7. PVC INNER SHEATH (EXTRUDED/TAPE WRAPPED)
  8. ARMOUR
  9. PVC OUTER SHEATH
 
Continuous Current Rating for Signle / Three Core Cables
With Aluminium / Copper Conductor
Nominal Cross
Sectional Area of
Conductor 		Continuous Current Rating
 for Three Core Cable 		Continuous Current Rating for
Single Core Cable
(Signle End Bonding)
When Laid in
Ground 		When Laid in
Air		 When Laid in
Ground		 When Laid in
Air
sq.mm. amps amps amps amps
35 115 120 115 135
145 155 150 170
50 135 145 140 160
170 190 175 205
70 165 185 170 200
210 235 215 260
95 195 225 200 250
250 290 255 315
120 220 255 230 285
285 330 290 370
150 245 295 250 325
315 375 325 420
185 280 340 285 375
355 435 370 485
240 320 400 330 445
410 510 415 570
300 360 460 375 510
460 590 475 660
400 410 535 425 610
520 670 540 770
500 465 620 485 710
570 770 600 880
630 - - 540 820
- - 670 1010
800 - - 610 950
- - 730 1140
1000 - - 660 1070
- - 780 1260
 
Continuous Current Rating for Signle / Three Core Cables
With Aluminium / Copper Conductor
Nominal
Cross
Sectional
 Area of
Conductor		 Continuous Current Rating
 for Three Core Cable		 Continuous Current Rating for
Single Core Cable
(Signle End Bonding)
When Laid in
Ground 		When Laid in
Air		 When Laid in
Ground		 When Laid in
Air
sq.mm. amps amps amps amps
35 110 130 115 140
145 165 150 185
50 130 155 135 170
170 200 175 225
70 160 190 165 215
205 245 215 275
95 190 230 195 255
245 300 250 340
120 215 265 225 295
275 340 290 390
150 240 300 250 330
305 385 325 440
185 270 340 280 380
345 435 365 500
240 310 400 470 440
395 510 420 590
300 350 455 370 520
440 580 470 680
400 395 530 420 610
495 660 530 780
500 445 610 480 710
550 750 590 900
630 - - 550 820
- - 660 1020
800 - - 610 950
- - 730 1140
1000 - - 680 1080
- - 790 1240
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