Medium Voltage Cables

Three Core XLPE Insulated Power Cable
6/6 6/10 kV (12 kV)

APPLICATION	This cable is used for urban networks. It can be installed aerially, in conduit, on open trays and in underground ducts.
VOLTAGE RATING	6/6 6/10 kV (12 kV)
CONSTRUCTION	Conductor: Compact round stranded copper or aluminium Conductor Shield: Semi-conducting tape and /or semi-conducting cross-linked polyethylene Insulation: Cross-linked polyethylene Insulation Shield: Semi-conducting cross-linked polyethylene Shield: Copper tape shield Filler: Polypropylene (Nonhygroscopic material) Binding Tape: Polyester and/or non-woven tape (Optional: water blocking tape) Bedding: Black polyethylene (Optional: polyvinyl chloride) Armour: Galvanized steel wire or steel tape armoured Sheath: Black Polyvinylene (ST7) (Optional: Polyvinyl Chloride)
SPECIFICATION	IEC60502-2

Detailed Specification

Non Armoured
Nominal cross sectional area	Reference conductor diameter	Nominal insulation thickness	Approx overall diameter of cable	Approx weight of cable
				Cu	Al
				Non Armoured	Non Armoured
mm²	mm	mm	mm	kg/km	kg/km
25	6.0	3.4	40	1951	1472
35	7.1	3.4	42	2368	1682
50	8.4	3.4	45	2822	1928
70	10.0	3.4	50	3710	2410
95	11.7	3.4	54	4720	2860
120	13.1	3.4	59	5853	3427
150	14.6	3.4	63	6812	3875
185	16.2	3.4	67	7620	4392
240	18.4	3.4	72	9774	5178
300	20.6	3.4	77	12114	6147
400	23.6	3.4	84	14533	7106
500	26.6	3.4	89	17520	8245

Steel Tape Armoured
Nominal cross sectional area	Reference conductor diameter	Nominal insulation thickness	Approx overall diameter of cable	Approx weight of cable
				Cu	Al
				Steel Tape Armoured	Steel Tape Armoured
mm²	mm	mm	mm	kg/km	kg/km
25	6.0	3.4	45	2949	2470
35	7.1	3.4	47	3422	2736
50	8.4	3.4	50	3954	3059
70	10.0	3.4	54	4825	3526
95	11.7	3.4	59	6005	4144
120	13.1	3.4	64	7280	4854
150	14.6	3.4	67	8324	5386
185	16.2	3.4	72	9554	6029
240	18.4	3.4	76	11522	6926
300	20.6	3.4	82	14062	8095
400	23.6	3.4	91	17858	10430
500	26.6	3.4	97	21228	11943

Steel Wire Armoured
Nominal cross sectional area	Reference conductor diameter	Nominal insulation thickness	Approx overall diameter of cable	Approx weight of cable
				Cu	Al
				Steel Wire Armoured	Steel Wire Armoured
mm²	mm	mm	mm	kg/km	kg/km
25	6.0	3.4	50	5517	5034
35	7.1	3.4	52	6097	5404
50	8.4	3.4	56	6212	5520
70	10.0	3.4	60	8376	7064
95	11.7	3.4	63	9424	7864
120	13.1	3.4	72	11352	9902
150	14.6	3.4	75	13609	10645
185	16.2	3.4	81	16469	12912
240	18.4	3.4	86	19180	14543
300	20.6	3.4	92	22206	16185
400	23.6	3.4	101	25546	18050
500	26.6	3.4	108	29205	21870

Note:
The approx weight of cable is the weight of PVC sheathed cable.

Continuous Current Capacity

Type	XLPE Insulated Unarmoured				XLPE Insulated Armoured
Arrange type	Delta (connect each other)				Flat (the space between adjacent cores is the overall diameter of the cable)
Laying method Nominal cross- section area (mm²)	in air		direct buried		in air		direct buried
Laying method Nominal cross- section area (mm²)	Cu	Al	Cu	Al	Cu	Al	Cu	Al
3 x 25	120	96	135	105	120	90	135	105
3 x 35	150	115	160	125	145	110	160	125
3 x 50	175	135	190	150	170	130	190	150
3 x 70	220	170	235	185	210	165	235	185
3 x 95	265	205	285	220	265	200	285	220
3 x 120	305	235	320	250	300	235	320	250
3 x 150	350	270	365	280	340	265	365	280
3 x 185	395	310	410	320	390	305	410	320
3 x 240	465	365	475	370	455	355	475	370
3 x 300	530	415	535	420	520	410	535	420
3 x 400	615	485	605	480	600	475	605	480
Ambient Temperature ˚C	40°C		25°C		40°C		25°C
Operating Temperature ˚C	90°C

Technical Properties

Main Technical Properties

No	Uo/U (kV) Rated Voltage Technical properties	3.6/6 (7.2)	6/6 6/10 (12)	8.7/10 8.7/15 (17.5)	12/20 (24)	18/30	21/35	26/35
1	Conductor DC resistance (Ω/km) See next	See next table
2	Routine partial discharge test Exert 2Uo, not higher than (pC)	5
3	Routine AC. Voltage test Uo ≤ 18kV, test 3.5Uo lasting 5min Uo > 18kV, exert 3.5Uo lasting 5min or exert 2.5Uo lasting 30min	12.6/5	21/5	30.5/5	42/5	63/5	73.5/5 (or) 52.5/30	91/5 (or) 65/30
4	Power frequency AC voltage test for 4 hours (kV)	14.4	24	34.8	48	72	84	104
5	Hot Set Test 200°C 15min, 20N/cm² Max. percentage elongation at loading (%) Max. percentage elongation after cooling (%)	130 15
6	Hot impact resistance test (kV) (Heating of 5°C higher than continuous operating temperature (positive & negative pole each 10 times))	60	75	95	125	170	200	250
7	Other tests	See Q / 320481LL019 - 2003

Conductor DC Resistance

Nominal cross-sectional area (mm²) 20°C, the D.C. resistance is not more than (Ω/km)	25	35	50	70	95	120	150	185
Cu	0.727	0.524	0.387	0.268	0.193	0.153	0.124	0.0991
Al	1.20	0.868	0.641	0.443	0.320	0.253	0.206	0.164

Nominal cross-sectional area (mm²) 20°C, the D.C. resistance is not more than (Ω/km)	240	300	400	500	630	800	1000
Cu	0.0754	0.0601	0.0470	0.0366	0.0283	0.0221	0.0176
Al	0.125	0.100	0.0778	0.0605	0.0469	0.0367	0.0291

Correction coefficient of current-carrying capacity under different ambient temperature

Operating temperature of conductor (°C)	Ambient temperature (in air) (°C)
Operating temperature of conductor (°C)	10	15	20	25	30	35	40	45	50
60	1.58	1.50	1.41	1.32	1.22	1.11	1.00	0.86	0.73
65	1.48	1.41	1.34	1.26	1.18	1.09	1.00	0.89	0.77
70	1.41	1.35	1.29	1.22	1.15	1.08	1.00	0.91	0.81
80	1.32	1.27	1.22	1.17	1.11	1.06	1.00	0.93	0.86
90	1.26	1.22	1.18	1.14	1.09	1.04	1.00	0.94	0.89
105	1.22	1.19	1.15	1.11	1.08	1.04	1.00	0.95	0.91

Operating temperature of conductor (°C)	Ambient temperature (in soil) (°C)
Operating temperature of conductor (°C)	10	15	20	25	30	35
60	1.20	1.13	1.07	1.00	0.93	0.85
65	1.17	1.12	1.06	1.00	0.94	0.87
70	1.15	1.11	1.05	1.00	0.94	0.88
80	1.13	1.09	1.04	1.00	0.95	0.90
90	1.11	1.07	1.04	1.00	0.96	0.92

Correction coefficient of current-carrying capacity for different specific thermal resistivity of ground

Voltage	Sectional area	Specific thermal resistivity of ground ρ t (K.m/W)
(kV)	(mm²)	0.8	1.0	1.2	1.5	2.0
3.6/6 ~ 6/6	≤35 50~150 ≥185	1.06 1.08 1.09	1.00 1.00 1.00	0.95 0.94 0.93	0.88 0.87 0.85	0.80 0.77 0.76
6/10 ~ 12/15	≤35 50~150 ≥185	1.05 1.06 1.07	1.00 1.00 1.00	0.95 0.94 0.93	0.89 0.88 0.86	0.80 0.79 0.77
12/20 ~ 26/35	≤95 ≥120	1.05 1.06	1.00 1.00	0.95 0.94	0.90 0.83	0.82 0.80

Correction coefficient of current rating capacity for multi - cables laid in parallel in air

Array	Layer no.	Layers x Pcs	Gap between cable/cable Dia. d/De		Correction factor of current rating	Note
Plane parallel array of multi-cable			Level	Vertical
	One layer	1 x 2	-	< 5	0.89	d = Gap between cables De = outer Dia. of cables One layer: 1 x 3 ΟΟΟ Two layers: 2 x 2 ΟΟ ΟΟ Three layers: 3 x 3 ΟΟΟ ΟΟΟ ΟΟΟ
		1 x 3	-	< 0.75	0.84
	Two layers	2 x 1	< 0.5	1.9~1.5	0.99
				1.4~1.0	0.97
				< 0.5	0.90
		2 x 2	< 0.5	2~1.5	0.99
				1.49~1.5	0.97
				0.9~0.5	0.90
	Three layers	3 x 1	-	4~3	0.99
				2.9~2.0	0.97
				1.9~1.0	0.94
				< 0.5	0.85
		3 x 2	< 0.5	4~3	0.99
				2.9~2.0	0.97
		3 x 3	< 0.75	1.9~1.0	0.94
				< 0.5	0.85

Note :
Cables are kept one cable dia. from the wall.

Max. calculated permissible short - circuit for conductor

Nominal cross-section of conductor mm²	Maximum permissible short-circuit for conductor (1 sec.) kA
Nominal cross-section of conductor mm²	Maximum permissible short-circuit for conductor (1 sec.) kA	Aluminium conductor
10	1.51	0.988
16	2.39	1.56
25	3.69	2.42
35	5.15	3.37
50	7.31	4.79
70	10.2	6.68
95	13.8	9.03
120	17.4	11.4
150	21.7	14.2
185	26.7	17.5
240	34.6	22.6
300	43.1	28.2
400	57.4	37.6
500	71.7	47.0
630	88.8	58.0

Max. permissible short-circuit for current for metallic screen (copper tape screen)

Nominal cross-section of conductor mm²	Rated voltages of cable (kV)
	3.6/6 (7.2)	6/6 6/10 (12)	8.7/10 8.7/15 (17.5)	12/20 (24)	18/30	21/35	26/35
	Short-Circuit Current A
25	1075	1083	1094	-	-	-	-
35	1074	1082	1092	1096	-	-	-
50	1072	1080	1091	1095	1284	1286	1288
70	1070	1079	1090	1091	1281	1285	1286
95	1069	1077	1086	1272	1280	1284	1283
120	1068	1077	1286	1271	1279	1280	1282
150	1067	1076	1265	1270	1278	1279	1282
185	1064	1251	1264	1267	1275	1276	1279
240	1241	1250	1262	1266	1274	1275	1278
300	1239	1246	1261	1265	1270	1272	1277
400	1240	1245	1256	1260	1270	1272	1274
500	1243	1244	1253	1257	1266	1272	1273
630	1236	1238	1252	1253	1265	1270	1270

Capacitance of cable (reference value)

Nominal cross-section of conductor mm²	Rated voltages of cable (kV)
	3.6/6 (7.2)	6/6 6/10 (12)	8.7/10 8.7/15 (17.5)	12/20 (24)	18/30	21/35	26/35
	Capacitance for each phase μ F/Km
25	0.2423	0.1922	0.1576	0.1378	0.1163	0.1064	0.0992
35	0.2684	0.1922	0.1725	0.1502	0.1251	0.1140	0.1061
50	0.3022	0.2367	0.1917	0.1661	0.1363	0.1239	0.1150
70	0.3462	0.2693	0.2167	0.1868	0.1508	0.1365	0.1263
95	0.3875	0.2999	0.2400	0.2060	0.1643	0.1483	0.1368
120	0.4236	0.3266	0.2603	0.2228	0.1760	0.1584	0.1460
150	0.4647	0.3570	0.2834	0.2418	0.1893	0.1700	0.1563
185	0.5059	0.3873	0.3123	0.2656	0.2060	0.1815	0.1665
240	0.5430	0.4290	0.3439	0.2916	0.2207	0.1972	0.1805
300	0.5589	0.4706	0.3755	0.3175	0.2387	0.2128	0.1745
400	0.5940	0.5311	0.4213	0.3551	0.2648	0.2354	0.2146
500	0.6167	0.5839	0.4613	0.3880	0.2876	0.2551	0.2321
630	0.6848	0.6481	0.5099	0.4278	0.3151	0.2789	0.2533

Inductance for three-core cable (reference value)

Nominal cross-section of conductor mm²	Rated voltages of cable (kV)
	3.6/6 (7.2)	6/6 6/10 (12)	8.7/10 8.7/15 (17.5)	12/20 (24)	18/30	21/35	26/35
	Inductance mH/Km
25	0.3552	0.3797	0.4061	-	-	-	-
35	0.3384	0.3613	0.3862	0.4064	-	-	-
50	0.3211	0.3423	0.3655	0.3845	0.4396	0.4396	0.4679
70	0.3040	0.3232	0.3445	0.3620	0.4145	0.4145	0.4427
95	0.2915	0.3092	0.3290	0.3454	0.3956	0.3956	0.4208
120	0.2826	0.2992	0.3178	0.3392	0.3799	0.3799	0.4019
150	0.2742	0.2897	0.3071	0.3217	0.3642	0.3642	0.3862
185	0.2672	0.2817	0.3009	0.3145	0.3485	0.3485	0.3737
240	0.2608	0.2726	0.2904	0.3030	0.3360	0.3360	0.3611
300	0.2576	0.2651	0.2817	0.2935	0.3266	0.3266	0.3485
400	0.2516	0.2564	0.2714	0.2822	0.3041	0.3041	0.3266
500	0.2480	0.2503	0.2641	0.2742	-	-	-
630	0.2421	0.2442	-	-	-	-	-

S - The distance between the two adjacent cable center, D - The overall diameter of the cable.

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