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LT & HT Cables

Products >> LT & HT Cables

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
Type	No. of Cores & Cross Sectional Ara	Min. No. of Wires	Thickness of PVC Insulation (Nom.) (mm)	Strip Armour	Wire Armour	Strip Armour	Wire Armour	Max. D.C. Resistance at 20 Ohms/km
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

STRANDED COMPACTED CIRCULAR CONDUCTOR
EXTRUDED CONDUCTOR SCREENING
XLPE INSULATION
EXTRUDED INSULATION SCREENING
METALLIC SCREENING
FILLERS
PVC INNER SHEATH (EXTRUDED/TAPE WRAPPED)
ARMOUR
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)
Nominal Cross Sectional Area of Conductor	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
35	145	155	150	170
50	135	145	140	160
50	170	190	175	205
70	165	185	170	200
70	210	235	215	260
95	195	225	200	250
95	250	290	255	315
120	220	255	230	285
120	285	330	290	370
150	245	295	250	325
150	315	375	325	420
185	280	340	285	375
185	355	435	370	485
240	320	400	330	445
240	410	510	415	570
300	360	460	375	510
300	460	590	475	660
400	410	535	425	610
400	520	670	540	770
500	465	620	485	710
500	570	770	600	880
630	-	-	540	820
630	-	-	670	1010
800	-	-	610	950
800	-	-	730	1140
1000	-	-	660	1070
1000	-	-	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)
Nominal Cross Sectional Area of Conductor	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
35	145	165	150	180
50	130	150	140	170
50	170	195	175	215
70	160	190	170	210
70	210	240	215	270
95	190	230	200	255
95	250	295	260	325
120	220	260	230	295
120	280	335	295	375
150	245	295	255	335
150	310	380	320	425
185	275	335	290	385
185	350	430	370	495
240	315	395	330	455
240	400	500	425	580
300	355	450	375	520
300	450	570	475	670
400	400	520	425	610
400	500	650	540	760
500	455	600	485	720
500	550	740	600	900
630	-	-	550	830
630	-	-	670	1010
800	-	-	620	950
800	-	-	730	1140
1000	-	-	670	1070
1000	-	-	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)
Nominal Cross Sectional Area of Conductor	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
35	145	165	150	185
50	130	155	135	170
50	170	200	175	225
70	160	190	165	215
70	205	245	215	275
95	190	230	195	255
95	245	300	250	340
120	215	265	225	295
120	275	340	290	390
150	240	300	250	330
150	305	385	325	440
185	270	340	280	380
185	345	435	365	500
240	310	400	470	450
240	395	510	420	590
300	350	455	370	520
300	440	580	470	680
400	395	530	420	610
400	495	660	530	780
500	445	610	480	710
500	550	750	590	900
630	-	-	550	820
630	-	-	660	1020
800	-	-	610	950
800	-	-	730	1140
1000	-	-	680	1080
1000	-	-	790	1240

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