Medium Voltage Cables

Single 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: Aluminium wire armoured Sheath: Black polyvinylene (ST7) (Optional: polyvinyl chloride)
SPECIFICATION	IEC60502-2

Detailed Specification

Nominal cross sectional area	Reference conductor diameter	Nominal insulation thickness	Approx overall diameter of cable	Approx weight of cable		Approx overall diameter of cable	Approx weight of cable
				Cu	Al		Cu	Al
				Non Armoured	Non Armoured		Aluminium Wire Armoured	Aluminium Wire Armoured
mm²	mm	mm	mm	kg/km	kg/km	mm	kg/km	kg/km
25	6.0	4.5	22	665	506	33	2788	2629
35	7.1	4.5	23	794	566	34	3050	2772
50	8.4	4.5	24	931	634	35	3261	2964
70	10.0	4.5	26	1175	743	37	3649	3217
95	11.7	4.5	27	1490	872	39	4115	3496
120	13.1	4.5	30	1857	1051	41	4673	3867
150	14.6	4.5	31	2152	1176	43	5104	4127
185	16.2	4.5	33	2496	1325	45	5588	4417
240	18.4	4.5	35	3077	1550	47	6375	4848
300	20.6	4.5	38	3817	1834	49	7320	5337
400	23.8	4.5	41	4669	2187	53	8492	6010
500	26.6	4.5	45	5615	2529	58	10362	7277
630	30.0	4.5	49	6898	3006	62	12053	8160
800	34.0	4.5	54	8518	3838	67	14050	9369
1000	38.2	4.5	61	10849	4656	72	16815	10622

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

Continuous Current Capacity

Type	XLPE Insulated Unarmoured
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
25	145	110	185	145	170	130	160	125
35	175	135	225	175	205	160	190	150
50	210	160	270	210	245	190	230	175
70	260	200	330	255	310	240	280	215
95	320	245	400	310	380	295	335	260
120	370	285	460	345	440	340	385	295
150	420	325	520	400	500	385	430	335
185	460	375	585	455	570	445	490	380
240	565	440	680	530	675	525	565	440
300	650	510	775	605	780	610	640	500
400	755	595	885	700	910	710	735	575
500	865	690	1000	795	1050	825	835	660
630	1000	810	1140	920	1230	970	960	760
800	1140	940	1270	1040	1420	1140	1080	865
1000	1250	1050	1370	1150	1580	1290	1180	970
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 single-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	0.5954	0.6143	0.6474	0.6621	0.7006	0.7168	0.7273
35	0.5753	0.5932	0.6248	0.6390	0.6762	0.6942	0.7021
50	0.5543	0.5711	0.6011	0.6145	0.6501	0.6675	0.6751
70	0.5357	0.5486	0.5765	0.5919	0.5252	0.6394	0.6467
95	0.5172	0.5318	0.5608	0.5726	0.6043	0.6180	0.6279
120	0.5059	0.5197	0.5473	0.5585	0.5891	0.6051	0.6118
150	0.4949	0.5079	0.5341	0.5449	0.5740	0.5895	0.5959
185	0.4885	0.5006	0.5252	0.5351	0.5640	0.5760	0.5839
240	0.4790	0.4890	0.5143	0.5216	0.5487	0.5615	0.5677
300	0.4749	0.4818	0.5032	0.5102	0.5376	0.5484	0.5540
400	0.4660	0.4702	0.4927	0.4991	0.5219	0.5343	0.5395
500	0.4600	0.4619	0.4848	0.4907	0.5128	0.5224	0.5272
630	0.4547	0.4563	0.4748	0.4827	0.5012	0.5101	0.5161

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

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Medium Voltage Cables

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

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