Three Core Cables To BS 6622

Three Core Medium Power Cable to BS 6622 Application: The three core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 3.6/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations,Website:http://www.ue-cable.com, 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: BS 6622 Conductor: Plain annealed copper or aluminium complying with IEC 60228/BS 6360. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid or stranded (class 2). Conductor Screen: Extruded layer of semi-conducting cross-linkable compound is applied over the conductor and shall cover the surface completely. The minimum thickness is 0.3mm and the maximum resistivity shall not exceed 500 Ohm-m at 90℃ Insulation: Insulation is of cross-linked polyethylene compound XLPE (GP8) conforming to BS 7655-1.3 or EPR (GP7), conforming to BS 7655-1.2. Table 1. Insulation Thickness      Nom. Cross Section Area Insulation Thickness at Nom. Voltage 3.8/6.6KV(Um=7.2KV) 6.35/11KV(Um=12KV) 8.7/15KV(Um=17.5KV) 12.7/22KV(Um=24KV) 19/33KV(Um=36KV) mm² mm mm mm mm mm 70 – 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 Above 500 3.2 3.4 4.5 5.5 8.0 Insulaton Screen: Extruded layer of semi-conducting cross-linkable compound is applied 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. As an option, a semi -conducting tape may be applied over the extruded semi-conducting layer as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 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. Inner Covering & Fillers: For cables with a collective metallic layer or cables with a metallic layer over each individual cores with additional collective metallic layers, semi-conducting inner covering and fillers shall be applied over the laid up cores. The inner covering is made of non hygroscopic material, except if the cable is to be made longitudinally watertight. The inner covering shall be extruded or lapped. The approximate thickness of extruded inner coverings is given in Table 2: Table 2. Approximate Thickness Of Extruded Inner Coverings Ficititous Diameter Over Laid Up Cores Approx. Thickress of Extruded Inner Covering mm mm > << p="">< 35 45 1.0 25 35 1.2 35 45 1.4 45 60 1.6 60 80 1.8 80 - 2.0 *The approximate thickness of lapped inner coverings shall be 0.6mm. Metallic Layer: The metallic layer shall be applied over each core or applied as a collective screen. The metallic screen shall consist of either copper tapes or a concentric layer of copper wires or a combination of tapes and wires. The metallic layer provides an earth fault current path, capable of withstanding fault current to earth of 1000A for one second at maximum temperature 160°C. 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 can be applied helically with overlap. Total cross section of copper wire screen is shown in table 3. Table 3. Minimum Total Cross Section Of Copper Wire Screen & DC Resistance Of The Screen Nominal Cross-Section Area of Cable Minimum Cross-Section of Copper Wire Screen Area 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 Separation Sheath (for armoured cable): The separation sheath comprises a layer of extruded PVC, PE or LSZH. The nominal thickness is calculated by 0.02Du + 0.6mm where Du is the fictitious diameter under the sheath in mm. The nominal separation sheath thickness shall not be less than 1.2mm. Armour (for armoured cable): The armour consists of galvanized steel wire applied over the inner covering with diameter specified as in Table 4. Table 4. Armour Wire Diameter Fictitiious Diameter Under the Armour Armour Wire Diameter mm mm > << p="">< 25 1.6 25 35 2.0 35 60 2.5 60 - 3.15 Over Sheath: Overall sheath comprises a layer of extruded either PVC type 9 conforming to BS 7665-4.2 or MDPE type TS2 conforming to BS 7655-10.1; LSZH can be offered as an option. The oversheath is normally black in colour. When a DC voltage test is to be performed on the oversheath, a semi-conducting layer such as graphite coating shall be applied over the surface of the extruded oversheath. The nominal oversheath thickness is calculated by 0.035+D where D is the diameter immediately under the oversheath in mm. For cables with the oversheath not applied over the armour, the nominal oversheath thickness shall not be less than 1.4mm. And for cables with oversheath applied over the armour, the nominal oversheath thickness shall not be less than 1.8mm. 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 Table 5. Nominal /Operating /Test Voltages Rated Voltage Uo/U Operating Voltage (Um) Testing Voltage (rms) 3.8/6.6KV 7.2KV 15KV 6.35/11KV 12KV 25.5KV 8.7/15KV 17.5KV 35KV 12.7/22KV 24KV 51KV 19/33KV 36KV 76KV hree Core 3.8/6.6KV (Um=7.2KV) Dimensional Data  Nom. Cross- Section Area Unarmoured Cables Steel Wire Armoured Cables Nom.Insulation Thickness Copper Tape Screen Area Nom.Sheath Thickness Approx. Overall Diameter Approx. Weight Copper Tape Screen Area Nom.Bedding Thickness Nom. Armour Wire Diameter Nom.Sheath Thickness Approx. Overall Diameter Approx. Weight CU AL CU AL mm2 mm mm2 mm mm kg/km mm2 mm mm mm mm kg / km 25 2.5 16 2.1 37.7 2205 1740 3.4 1.2 2.0 2.2 44.5 3890 3465 35 2.5 16 2.3 41.2 2690 2010 3.6 1.2 2.5 2.3 46.8 4420 3730 50 2.5 16 2.5 44.9 3340 2350 3.8 1.3 2.5 2.5 51.5 5640 4690 70 2.5 16 2.6 48.0 4050 2730 4.3 1.3 2.5 2.6 55.0 6570 5240 95 2.5 16 2.7 51.7 5000 3180 4.7 1.4 2.5 2.7 58.9 7760 5890 120 2.5 16 2.8 54.7 5890 3590 5.0 1.5 2.5 2.8 62.1 8810 6510 150 2.5 25 2.9 58.4 6960 4160 5.3 1.5 2.5 2.9 65.8 10110 7310 185 2.5 25 3.0 61.9 8160 4650 5.8 1.6 2.5 3.0 69.5 11520 7960 240 2.6 25 3.2 68.1 10210 5530 6.3 1.7 2.5 3.2 75.9 13920 9140 300 2.8 25 3.5 73.6 12380 6670 7.0 1.8 3.15 3.5 83.1 17400 11620 400 3.0 35 3.7 83.8 16190 8430 7.7 2.0 3.15 3.7 93.0 21900 13980 Electrical Data Nom. Cross- Section Area Unarmoured Cables Steel Wire Armoured Cables Current Ratings 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 Per Core 1 sec Short Circuit Rating of Copper Tape Screen Per Core 1 sec Reac-tance Induc- tance Ground Duct Air CU AL CU AL CU AL mm2 μΩ/m μΩ/m kA pF/m mA/m kA kA μΩ/m nH/m A A A 25 727/1200 927/1538 3.6/2.3 272 0.33 2.6 0.4 113 370 140 115 125 95 145 115 35 524/868 668/1113 5.0/3.2 301 0.36 2.6 0.5 108 350 170 135 150 115 175 140 50 387/641 494/822 6.8/4.4 332 0.40 2.6 0.5 102 330 210 160 180 135 220 170 70 268/443 343/568 9.8/6.3 383 0.46 2.6 0.6 97 310 255 195 215 165 270 210 95 193/320 248/410 13.3/8.5 432 0.52 2.6 0.6 92 290 300 230 255 200 330 250 120 153/253 196/325 17.2/11.0 474 0.57 2.6 0.7 89 280 340 265 290 225 375 295 150 124/206 159/265 21.2/13.5 511 0.61 4.3 0.7 87 280 380 295 330 255 430 330 185 99.1/164 128/211 26.6/17.0 562 0.67 4.3 0.8 86 270 430 335 370 290 490 385 240 75.4/125 98/161 34.9/22.3 602 0.72 4.3 0.9 83 260 490 380 425 335 570 450 300 60.1/100 80/130 43.8/28.0 622 0.75 4.3 1.0 82 260 540 435 470 375 650 510 400 47.0/77.8 64/102 57.3/36.6 648 0.78 5.8 1.1 80 250 590 480 520 420 700 570 Three Core 6.35/11KV (Um=12KV) Dimensional Data  Nom. Cross- Section Area Unarmoured Cables Steel Wire Armoured Cables Nom. Insulation Thickness Copper Wire Screen Area Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight Copper Tape Screen Area Nom. Bedding Thickness Nom. Armour Wire Diameter Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight CU AL CU AL mm2 mm mm2 mm mm kg/km mm2 mm mm mm mm kg / km 25 3.4 16 2.3 42.8 2600 2120 3.8 1.3 2.5 2.4 50.0 4930 4400 35 3.4 16 2.3 45.3 3000 2320 4.1 1.3 2.5 2.5 52.3 5380 4700 50 3.4 16 2.4 48.5 3630 2690 4.4 1.4 2.5 2.6 55.7 6210 5260 70 3.4 16 2.5 52.0 4440 3110 4.7 1.4 2.5 2.7 59.2 7200 5870 95 3.4 16 2.7 56.0 5440 3620 5.2 1.5 2.5 2.8 63.2 8420 6550 120 3.4 16 2.8 59.4 6370 4020 5.5 1.6 2.5 3.0 67.0 9580 7190 150 3.4 25 2.9 62.7 7430 4630 5.8 1.6 2.5 3.1 70.3 10830 8030 185 3.4 25 3.0 66.1 8680 5150 6.2 1.7 2.5 3.2 73.9 12290 8720 240 3.4 25 3.1 71.7 10690 5990 6.8 1.8 3.15 3.4 81.2 15620 10790 300 3.4 25



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