Medium Voltage Cables

Three Core XLPE Insulated Power Cable
8.7/10 8.7/15 kV (17.5 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	8.7/10 8.7/15 kV (17.5 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	4.5	46	2380	1901
35	7.1	4.5	49	2818	2132
50	8.4	4.5	52	3299	2405
70	10.0	4.5	56	4117	2818
95	11.7	4.5	59	5155	3294
120	13.1	4.5	64	6317	3892
150	14.6	4.5	68	7303	4366
185	16.2	4.5	72	8405	4880
240	18.4	4.5	77	10323	5728
300	20.6	4.5	82	12658	6691
400	23.6	4.5	89	15195	7767
500	26.6	4.5	96	18305	9020

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	4.5	50	3406	2929
35	7.1	4.5	53	3896	3210
50	8.4	4.5	56	4441	3547
70	10.0	4.5	59	5342	4042
95	11.7	4.5	64	6557	4697
120	13.1	4.5	69	7896	5471
150	14.6	4.5	73	8971	6033
185	16.2	4.5	76	10179	6654
240	18.4	4.5	82	12272	7676
300	20.6	4.5	88	15673	9706
400	23.6	4.5	96	18830	11402
500	26.6	4.5	104	22267	12982

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	4.5	55	6203	5719
35	7.1	4.5	59	6824	6132
50	8.4	4.5	61	8195	7291
70	10.0	4.5	65	8713	7401
95	11.7	4.5	69	10085	8208
120	13.1	4.5	74	11720	9273
150	14.6	4.5	78	12915	9951
185	16.2	4.5	82	14487	10931
240	18.4	4.5	87	16828	12231
300	20.6	4.5	92	19689	13668
400	23.6	4.5	103	22440	15160
500	26.6	4.5	110	25961	16874

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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Medium Voltage Cables

Three Core XLPE Insulated Power Cable 8.7/10 8.7/15 kV (17.5 kV)

Three Core XLPE Insulated Power Cable
8.7/10 8.7/15 kV (17.5 kV)