Medium Voltage Cables

Medium Voltage Cables to BS 6622

Medium Voltage Cables to IEC 60502

Medium Voltage Cables to VDE 0276

Medium Voltage Cables to VDE 0276

Single Core Cables to VDE 0276

Application
The single core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 3.8/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations.

Standards
DIN VDE 0276 Part 620 -622
HD 620 S1

Conductor: Stranded compacted circular copper or aluminium conductors according to IEC
60228 class 2 / VDE 0276 class 2 / VDE 0295 HD 383. All internal interstices of the conductor are filled with water blocking compound to prevent ingress of water through conductor during storage, handing, installation and operation of the cable.
Conductor Screen: The conductor screen consists of an extruded layer of non metallic, semi-conducting compound firmly bonded to the insulation to exclude all air voids. The screen has a minimum thickness of 0.3mm and the maximum volume resistivity of 500 Ohm-m at
90°C.
Insulation: Insulation is of extruded XLPE compound type 2XI1 according to DIN VDE 0207 part 22 and HD 620.1 with high degree of cross-linking, free from contaminants, air voids and heat resistant by dry cured process.
The nominal insulation wall thickness is shown in table 1.
Table 1. Insulation Thickness

Nom. Cross Section Area	Insulation Thickness at Nom. Voltage
	3.6/6KV (Um=7.2kV)	6/10kV (Um=12kV)	8.7/15kV (Um=17.5kV)	12/20kV (Um=24kV)	18/30kv (Um=36kV)
mm²	mm	mm	mm	mm	mm
35	2.5	3.4	4.5	5.5	-
50	2.5	3.4	4.5	5.5	8.0
70	2.5	3.4	4.5	5.5	8.0
95	2.5	3.4	4.5	5.5	8.0
120	2.5	3.4	4.5	5.5	8.0
150	2.5	3.4	4.5	5.5	8.0
185	2.5	3.4	4.5	5.5	8.0
240	2.6	3.4	4.5	5.5	8.0
300	2.8	3.4	4.5	5.5	8.0
400	3.0	3.4	4.5	5.5	8.0

Insulation Screen: The insulation screen consists of extruded non metallic, semi-conducting compound extruded over the insulation. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating.The minimum thickness is 0.3mm and the maximum volume resistivity of 500
Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can
be easily hand stripped on site.
Conducting Water Blocking Layer: The insulation screen may be coverd by semi- conductive water blocking tape which will swell up under the influence of moisture of water to ensure longitudinal watertightness.
Metallic Screen: Copper wires are applied over the conducting water blocking layer with a minimum diameter of 0.5mm. And over the copper wires, copper tape with minimum thickness of 0.1mm is applied helically with overlap. Total cross section of metallic screen layer is shown in table 2. The screen can withstand fault current to earth of 1000 A for one second at maximum temperature of 160°C. Minimum cross section of concentric conductor is according to DIN VDE 0273 & 0276 as shown.
Table 2. Minimum Total Cross Section of Metallic Screen

Nominal Cross-Section Area Of Cable	Minimum Cross-Section of Metallic Screen	DC Resistance of the Copper Wire Screen
mm²	mm²	mm
Up to 120	16	1.06
150-300	25	0.72
400-630	35	0.51
800-1000	50	0.35

Separator / Water Blocking Layer: The metallic screen may be covered by non-conducting water blocking tape which will swell up under the influence of moisture of water to ensure longitudinal watertightness.
Separation Sheath (for armoured cable): The separation sheath comprises a layer of extruded PVC, PE or LSZH, applied under the armour. Thickness of separation sheath as shown in table 3.
Table 3. Separation Sheath Thickness

Core Diameter		Approx.Thickess of Inner Sheath
mm		mm
>	<
35	45	1.4
45	60	1.6
60	80	1.8
80	-	2.0

Armour (for armoured cable): The armour consists of round aluminium wire armour applied helically over an extruded separation sheath.
Table 4. Round Armour Wire Diameter

Fictitious Diameter Under the Armour		Armour Wire Diameter
mm		mm
>	<
-	10	0.8
10	15	1.25
15	25	1.6
25	35	2.0
35	60	2.5
60	-	3.15

Outer Sheath: Overall sheath comprises a layer of extruded PE compound DMP2 according to HD620.1 and 2YM3 type to DIN VDE 0276 Part 3, or PVC compound DMV6 according to HD620.1 and YM5 to DIN VDE 0276 Part 6. Normal wall thickness is 2.5mm (1/500mm
18/30sq 2.6mm), suitable for exposure to sun-light or other local atmospheric environments and for the operating temperature of the cable.

PHYSICAL PROPERTIES:
Operating Temperature: up to 90°C
Temperature Range: -5°C ( PVC sheath ); -20°C ( PE sheath )
Short Circuit Temperature: 250°C (short circuit duration up to 5 seconds)
Bending Radius: 15 x OD (Cable without metal sheath)
30 x OD (Cable with aluminium sheath)
Table 5. Nominal /Operating /Testing Voltages

Nominal Voltage Uo/U	Operating Voltage (max)	Testing Voltage
3.6/6KV	8KV	10KV
6/10KV	12KV	15KV
8.7/15KV	18KV	22.5KV
12/20KV	24KV	30KV
18/30KV	36KV	45KV

TYPE CODES:

Cores
N         According to VDE Standard (No abbreviation for copper conductor) A            Aluminium Conductor
2X       XLPE Insulation
Y         PVC Insulation

Screen
S         Screen of copper wires and copper tape, helically wound.
SE       Screen of copper wire plus copper tape over each individual cores, helically wound
(F)       Longitudinally waterproof screen.

Concentric Conductor Screen
C         Concentric conductor screen of copper wires and copper tape, helically wound.
CE      Concentric conductor screen of copper wire plus copper tape over each individual cores, helically wound.

Jacket
2Y       PE Jacket
Y         PVC Jacket
H         LSZH Jacket

Single Core 1.8/3KV (Um=3.6KV) Dimensional Data

Nom. Cross- Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area*	Nom. Sheath Thickness	Nom. Overall Diameter	Approx. Weight
						N2XSY/ N2XSH Cu	NA2XSY/ NA2XSH Al	N2XS2Y Cu	NA2XS2Y Al	N2XS (F) 2Y Cu	NA2XS (F) 2Y Al
mm²	mm	mm	mm²	mm	mm	kg / km	kg / km	kg / km	kg / km	kg / km	kg / km
25	2.0	0.1	16	1.4	13	500	180	480	140	500	230
35	2.0	0.1	16	1.4	14	620	280	600	240	620	330
50	2.0	0.1	16	1.4	15	700	380	750	290	750	430
70	2.0	0.1	16	1.5	17	900	480	800	380	1000	560
95	2.0	0.1	16	1.5	19	1200	590	1050	460	1300	670
120	2.0	0.1	16	1.6	21	1450	700	1300	550	1500	800
150	2.0	0.1	25	1.6	22	1700	800	1550	650	1800	900
185	2.0	0.1	25	1.7	24	2050	850	1900	750	2150	950
240	2.0	0.1	25	1.8	27	2550	1050	2350	900	2650	1150
300	2.0	0.1	25	1.8	29	3150	1250	2950	1050	3250	1350
400	2.0	0.1	35	1.9	32	3950	1550	3800	1450	4100	1650
500	2.2	0.1	35	2.0	35	5000	2000	4800	1800	5200	2150
630	2.4	0.1	35	2.2	38	6200	2200	6300	2100	6400	2350
800	2.6	0.1	35	2.3	44	8000	2900	7900	2800	8200	3050

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as standard.

Electrical Data

Nom. Cross- Section Area	D C Resistance CU / AL	A C Resistance CU / AL	Short Circuit Rating of Conductor CU / AL 1 sec	Capaci- tance	Charging Current	Short Circuit Rating of Copper Wire Screen 1 sec	Short Circuit Rating of Copper Tape Screen 1 sec	Reactance		Inductance		Impedance
												Trefoil		Flat Spaced
								Trefoil	Flat Spaced	Trefoil	Flat Spaced	cu	AL	cu	AL
mm2	µΩ/m	µΩm	kA	pF/m	mA/m	kA	kA	µΩ/m		nH/m		µΩ/ m		µΩ/ m
25	727/1200	929/1538	3.6/2.3	222	0.32	2.6	0.3	131	185	345	535	936	1544	952	1554
35	524/868	668/1113	5.0/3.2	251	0.35	2.6	0.4	122	178	327	524	679	1121	695	1131
50	387/641	494/822	6.8/4.4	281	0.39	2.6	0.4	116	172	313	514	511	834	527	844
70	268/443	343/568	9.8/6.3	341	0.45	2.6	0.5	110	165	300	495	364	583	386	597
95	193/320	248/410	13.3/8.5	397	0.50	2.6	0.5	104	160	287	485	272	427	300	446
120	153/253	196/325	17.2/11.0	430	0.55	2.6	0.6	104	159	280	475	225	345	257	367
150	124/206	159/265	21.2/13.5	464	0.59	4.3	0.6	100	156	274	465	193	287	229	313
185	99.1/164	128/211	26.6/17.0	513	0.65	4.3	0.7	98	154	267	459	165	237	206	267
240	75.4/125	98/161	34.9/22.3	573	0.70	4.3	0.9	94	150	260	455	140	191	185	226
300	60.1/100	80/130	43.8/28.0	652	0.72	4.3	1.0	91	147	253	445	128	163	174	203
400	47.0/77.8	64/102	57.3/36.6	727	0.75	5.8	1.1	90	147	248	435	113	141	164	184
500	36.6/60.5	51/81	72.3/46.2	754	0.79	5.8	1.2	89	145	245	425	105	124	158	171
630	28.3/46.9	42/64	91.2/58.3	786	0.87	5.8	1.3	86	143	243	415	97	110	151	160

SIngle Core 3.6/6KV (Um=7.2 KV)
Single Core 6/10KV (Um=12 KV)
Singke Core 8.7/15KV (Um=17.5KV)
Single Core 12/20KV (Um=24KV)  
Single Core 18/30KV (Um=36KV)
Current Rating for Single Core 1.8/3KV(Um=3.6KV ) to 18/30KV(Um=36KV)

Current Rating Conditions:

Ground Temperature: 20°C Ambient Temperature (air): 30°C Depth of Soil: 0.8m
Thermal Resistance of Soil: 1.5K•m/W