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title LT & HT CablesProducts >> LT & HT Cables title

LT Power Cables | HT Power Cables

LT Power Cables

LT Power Cables with PVC or XLPE insulation of voltage 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

0.8

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

18

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

23.2

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

1605

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

115

125
115
140

145

165
150
180

50

130
150
140
170
170
195
175
215

70

160
190
170
210
210
240
215
270

95

190
230
200
255
250
295
260
325

120

220
260
230
295
280
335
295
375

150

245
295
255
335
310
380
320
425

185

275
335
290
385
350
430
370
495

240

315
395
330
455
400
500
425
580

300

355
450
375
520
450
570
475
670

400

400
520
425
610
500
650
540
760

500

455
600
485
720
550
740
600
900

630

-
-
550
830
-
-
670
1010

800

-
-
620
950
-
-
730
1140

1000

-
-
670
1070
-
-
790
1250


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
450
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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LT Cable Jointing Kits
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