THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE Document Number: EDS 02-0027 ENGINEERING DESIGN STANDARD EDS 02-0027 11KV TRIPLEX CABLE Network(s): EPN, LPN, SPN Summary: This engineering design standard provides the necessary technical information for the use of Triplex 11kV cables for UK Power Networks. Originator: Paul Williams Approved By: Steve Mockford Approved Date: 11/12/2012 Review Date: 10/12/2015 This document forms part of the Company s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of UK Power Networks Director of Asset Management. If you have any queries about this document please contact the originator of the current issue. Document History (The document history notes below are intended as a guide only and may not cover all of the changes. If you wish to make use of this document it should be read in full.) Version Date Details Originator 5.0 09/06/2009 Document reviewed and updated Paul Williams 6.0 23/10/2009 Additional Cable Size 185mm copper added to document Paul Williams 6.1 03/02/2011 Document rebranded Don Fossett 6.2 04/08/2011 Document reclassified from EI to EDS Don Fossett 7.0 29/06/2012 Added winter cable ratings and checked for suitability for publication as a G81 document Michael Sinclair 8.0 03/12/2012 Document reviewed, no changes Paul Williams 1 of 14 UK Power Networks 2012 All rights reserved
Contents 1 Introduction... 3 2 Scope... 3 3 Details... 3 3.1 Standard Drum Lengths, Sizes and Weights... 3 3.2 Current Table for Triplex Cables... 4 3.3 Current Tables for Comparison with Existing Designs... 5 3.3.1 Three core Belted PILC Cables with Copper s... 5 3.3.2 Three core Belted PILC Cables with Aluminium s... 5 3.3.3 Three core PICAS Cables with Aluminium s... 5 3.3.4 Single core Poly laminate Cables laid in Trefoil with Solid Aluminium s... 6 3.3.5 Single core Polymeric Cables laid in Trefoil with Solid Aluminium s... 6 3.3.6 Single core Polymeric Cables laid in Trefoil with Stranded Copper s... 6 3.4 Nexans Technical Data Sheets... 7 3.5 Prysmian Technical Data Sheets... 9 Appendix A Cable s for Widely Used Installation Conditions... 11 A.1 Single Circuit Laid Direct... 11 A.2 Double Circuit laid Direct (Both circuits loaded at the same time)... 12 A.3 Ducted Single Circuit... 13 A.4 Ducted Double Circuit (Both circuits loaded at the same time)... 14 2 of 14 UK Power Networks 2012 All rights reserved
1 Introduction The purpose of this engineering design standard is to provide designers and installers with the necessary technical and practical information required to enable the use of the new design of 11kV triplex cable in UK Power Networks. 2 Scope This document only covers the five main types of triplex 11kV cable supplied by either Nexans or Prysmian Cables: 95mm 2 aluminium single core XLPE cable laid up in triplex format; 185mm 2 aluminium single core XLPE cable laid up in triplex format; 185mm 2 copper single core XLPE cable laid up in triplex format; 300mm 2 aluminium single core XLPE cable laid up in triplex format; 300mm 2 copper single core XLPE cable laid up in triplex format. 3 Details 3.1 Standard Drum Lengths, Sizes and Weights The following table details the standard drum lengths, drum sizes and drum weights that apply to the standard drum lengths available from UK Power Networks Logistics Department. Longer drum lengths can be made available but these would be subject to a special order on the manufacturer with a longer lead time. Size (mm) Standard Drum Length (m) Manufacturer Standard Drum Dimensions (mm) 95 Al 500 Nexans 2200 x 1186 1845 185 Al 250 Nexans 2200 x 1186 1552 300 Al 250 Nexans 2200 x 1186 1940 300 Cu 250 Nexans 2600 x 12 4122 95 Al 500 Prysmian 2200 x 1112 1953 185 Al 250 Prysmian 1900 x 1112 1590 185 Cu 250 Prysmian 2200 x 1020 2530 300 Al 250 Prysmian 2200 x 1112 2034 300 Cu 250 Prysmian 2600 x 1132 3813 Standard Drum Weight (kg) 3 of 14 UK Power Networks 2012 All rights reserved
3.2 Current Table for Triplex Cables This table provides a guide to the current ratings for triplex cables. All the ratings quoted are s for 1 single triplex cable only and are in accordance with Engineering Recommendation P17. The MVA ratings are for a three-phase supply. s for multiple cable circuits should be calculated individually. Appendix A of this document provides ratings for the more commonly used types of installation: Area mm² 95 Al 185 Al 185 Cu 300 Al 300 Cu Current per Cable Based on a 600mm depth of cover Laid direct in ground Installed in ducts Installed in Free air (Shaded from Solar Radiation) Amps MVA Amps MVA Amps MVA 321 464 590 609 766 6.11 8.83 11.23 11.59 14.58 237 340 432 444 557 4.51 6.47 8.22 8.45 10.60 313 467 594 629 791 5.96 8.89 11.30 11.97 15.05 Area mm² 95 Al 185 Al 185 Cu 300 Al 300 Cu Current per Cable Based on a 600mm depth of cover Laid direct in ground Installed in ducts Installed in Free air (Shaded from Solar Radiation) Amps MVA Amps MVA Amps MVA 360 524 665 689 867 6.85 9.97 12.65 13.11 16.50 246 354 449 463 581 4.68 6.74 8.54 8.81 11.06 325 485 617 653 822 6.18 9.23 11.74 12.43 15.64 4 of 14 UK Power Networks 2012 All rights reserved
3.3 Current Tables for Comparison with Existing Designs The tables in this section are designed to provide a guide between the current ratings of existing designs and the new triplex cables. All the ratings quoted are s and are in accordance with Engineering Recommendation P17. The MVA ratings are for a three-phase supply. 3.3.1 Three core Belted PILC Cables with Copper s Area in² 0.0225 0.04 0.06 0.10 0.15 0.20 0.25 0.30 0.40 0.50 Current per 600mm depth of cover, g = 1.2 C m/watt. Ground / Air temp = 15 C Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 97 135 171 231 291 345 399 451 535 601 1.85 2.57 3.25 4.40 5.54 6.57 7.59 8.58 10.18 11.44 77 106 134 181 226 269 307 345 408 456 1.47 2.02 2.55 3.44 4.30 5.12 5.84 6.57 7.76 8.68 300mm 2 Cu 87 120 153 208 263 317 365 414 496 561 1.66 2.28 2.91 3.96 5.00 6.03 6.95 7.88 9.44 10.68 * shaded from solar radiation 3.3.2 Three core Belted PILC Cables with Aluminium s Area 0.0225in² 0.04in² 0.06in² 0.10in² 0.15in² 0.20in² 0.25in² 0.30in² 0.40in² 0.50in² 95mm² 185mm² 240mm² 300mm² Current per 600mm depth of cover, g = 1.2 C m/watt. Ground / Air temp = 15 C Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 75 104 133 180 226 271 311 352 421 476 233 351 414 473 1.43 1.98 2.53 3.43 4.30 5.16 5.92 6. 8.01 9.06 4.43 6.68 7.88 9.00 *shaded from solar radiation 59 81 103 139 174 208 237 268 318 359 176 262 307 349 1.12 1.54 1.96 2.65 3.31 3.96 4.51 5.10 6.05 6.83 3.35 4.99 5.84 6.64 3.3.3 Three core PICAS Cables with Aluminium s Area 95mm² 185mm² 300mm² 43 93 118 162 204 246 284 324 390 444 210 321 381 439 0.82 1.77 2.25 3.08 3.88 4.68 5.40 6.17 7.42 8.45 4.00 6.11 7.25 8.35 Current per 600mm depth of cover, g = 1.2 C m/watt. Ground / Air temp = 15 C Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 245 359 474 4.65 6.83 9.02 *shaded from solar radiation 180 269 358 3.60 5.12 6.81 217 326 439 3.90 6.20 8.35 5 of 14 UK Power Networks 2012 All rights reserved
3.3.4 Single core Poly laminate Cables laid in Trefoil with Solid Aluminium s Area 150mm² 240mm² Current per 600mm depth of cover, g = 1.2 C m/watt. Ground / Air temp = 15 C Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 410 540 7.80 10.28 *shaded from solar radiation 315 415 5.99 7.90 360 520 6.85 9.90 3.3.5 Single core Polymeric Cables laid in Trefoil with Solid Aluminium s Area mm² 150mm² 185mm² 240mm² 300mm² Current per 600mm depth of cover, g = 1.2 C m/watt. Ground / Air temp = 15 C Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 266 405 459 534 606 5.06 7.71 8.73 10.16 11.53 *shaded from solar radiation 198 298 338 392 442 3.77 5.67 6.43 7.46 8.41 256 400 458 540 619 4.87 7.61 8.72 10.28 11.78 3.3.6 Single core Polymeric Cables laid in Trefoil with Stranded Copper s Area 185mm² 240mm² 300mm² Current per 600mm depth of cover, g = 1.2 C m/watt. Ground / Air temp = 15 C Laid Direct in ground Installed in ducts Installed in air Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 595 687 776 11.32 13.07 14.77 *shaded from solar radiation 300mm 2 Cu 300mm 2 Cu 436 502 565 8.30 9.55 10.75 300mm 2 Cu 300mm 2 Cu 599 0 801 11.40 13.32 15.24 300mm 2 Cu 300mm 2 Cu 6 of 14 UK Power Networks 2012 All rights reserved
3.4 Nexans Technical Data Sheets 1. Stranded Aluminium 2. Semi-Conducting Screen 3. XLPE Insulation 4. Bonded Semi-Conducting Screen 5. 35 or mm² Copper Wire Screen 6. Binder tape 7. Red LLDPE Sheath Nexans 6350/11000 Volt Triplex Cable XLPE insulation Stranded aluminium conductor Copper wire screened UK Power Networks Standard EDS 02-0940 Nominal cross-sectional area mm² 95 185 300 Approximate diameter over conductor Mm 11.4 15.9 20.3 Approximate thickness of conductor screen mm 0.3 0.3 0.3 Minimum average thickness of insulation mm 3.4 3.4 3.4 Nominal area of copper wire screen Number of wires Nominal diameter of wires mm² mm 35 0.80 1.13 Minimum average thickness of oversheath mm 1.43 1.51 1.68 Approximate overall diameter of Single Core mm 26.7 32.1 36.9 Approximate overall diameter of Triplex Cable mm 57.7 69.4 79.8 Approximate cable weight kg/m 2.9 4.8 6.1 Minimum bending radius mm 460 555 640 Maximum pulling tension on Triplex Group kg 855 1665 20 Nominal internal diameter of duct mm 100 110 120 Maximum DC screen resistance @ 20 C /km 0.542 0.271 0.271 Approximate Capacitance (C) µf/km 0.28 0.36 0.44 Maximum DC resistance (R) @ 20 C /km 0.320 0.164 0.100 Maximum AC resistance (R ) @ 90 C /km 0.411 0.211 0.130 Inductance (L) @ 50Hz @ 90 C mh/km 0.359 0.330 0.309 Reactance (X) @ 50Hz @ 90 C /km 0.056 0.054 0.053 Zero Sequence Resistance /km 0.988 0.530 0.448 Zero Sequence Reactance /km 0.236 0.102 0.097 Positive Sequence Resistance /km 0.415 0.220 0.138 Positive Sequence Reactance /km 0.112 0.102 0.096 Short circuit ratings 1 Second Short Circuit of (90 to 250 C) ka 9.2 17.9 28.8 1 Second Short Circuit of Copper wire screen (80 to 250 C) ka 8.6 13.1 13.1 1.13 7 of 14 UK Power Networks 2012 All rights reserved
Nexans Technical Data Sheets - Continued 1. Stranded Copper 2. Semi-Conducting Screen 3. XLPE Insulation 4. Bonded Semi-Conducting Screen 5. mm² Copper Wire Screen 6. Binder tape 7. Red LLDPE Sheath Nexans 6350/11000 Volt Triplex Cable XLPE insulation Stranded copper conductor Copper wire screened Nominal cross-sectional area mm² 300 Approximate diameter over conductor Mm 20.5 Approximate thickness of conductor screen mm 0.4 Minimum average thickness of insulation mm 3.4 Nominal area of copper wire screen Number of wires Nominal diameter of wires UK Power Networks Standard EDS 02-0940 mm² mm 60 1.23 Minimum average thickness of oversheath mm 1.68 Approximate overall diameter of Single Core mm 38.8 Approximate overall diameter of Triplex Cable mm 87.7 Approximate cable weight kg/m 12.29 Minimum bending radius mm 5 Maximum pulling tension on Triplex Group kg 1500 Nominal internal diameter of duct mm 125 Maximum DC screen resistance @ 20 C /km 0.247 Approximate Capacitance (C) µf/km 0.51 Maximum DC resistance (R) @ 20 C /km 0.06010 Maximum AC resistance (R ) @ 90 C /km 0.07904 Inductance (L) @ 50Hz @ 90 C mh/km 0.31 Reactance (X) @ 50Hz @ 90 C /km 0.10 Zero Sequence Resistance /km 0.39 Zero Sequence Reactance /km 1.038 Positive Sequence Resistance /km 0.09 Positive Sequence Reactance /km 0.097 Short circuit ratings 1 Second Short Circuit of (90 to 250 C) ka 43.3 1 Second Short Circuit of Copper wire screen (80 to 250 C) ka 13.1 8 of 14 UK Power Networks 2012 All rights reserved
3.5 Prysmian Technical Data Sheets 1. Stranded Aluminium 8. Semi-Conducting Screen 9. XLPE Insulation 10. Bonded Semi-Conducting Screen 11. 35 or mm² Copper Wire Screen 12. Binder tape 13. Red LLDPE Sheath Prysmian 6350/11000 Volt Triplex Cable XLPE insulation Stranded aluminium conductor Copper wire screened UK Power Networks Standard EDS 02-0940 Nominal cross-sectional area mm² 95 185 300 Approximate diameter over conductor Mm 11.3 16.0 20.2 Approximate thickness of conductor screen mm 0.3 0.3 0.3 Minimum average thickness of insulation mm 3.4 3.4 3.4 Nominal area of copper wire screen Number of wires Nominal diameter of wires mm² mm 35 39 1.07 38 1.53 Minimum average thickness of oversheath mm 1.8 1.9 2.1 Approximate overall diameter of Single Core mm 26.1 32.4 36.6 Approximate overall diameter of Triplex Cable mm 56.0 69.6 78.6 Approximate cable weight kg/m 2.81 4.80 5.93 Minimum bending radius mm 480 580 660 Maximum pulling tension on Triplex Group kg 855 1665 20 Nominal internal diameter of duct mm 100 110 120 Maximum DC screen resistance @ 20 C /km 0.542 0.271 0.271 Approximate Capacitance (C) µf/km 0.28 0.37 0.45 Maximum DC resistance (R) @ 20 C /km 0.32 0.164 0.1 Maximum AC resistance (R ) @ 90 C /km 0.411 0.211 0.130 Inductance (L) @ 50Hz @ 90 C mh/km 0.36 0.33 0.30 Reactance (X) @ 50Hz @ 90 C /km 0.11 0.10 0.10 Zero Sequence Resistance /km 0.862 0.435 0.371 Zero Sequence Reactance /km 0.040 0.032 0.026 Positive Sequence Resistance /km 0.411 0.211 0.130 Positive Sequence Reactance /km 0.096 0.096 0.080 Short circuit ratings 1 Second Short Circuit of (90 to 250 C) ka 9.2 17.9 28.8 1 Second Short Circuit of Copper wire screen (80 to 250 C) ka 8.6 13.1 13.1 38 1.53 9 of 14 UK Power Networks 2012 All rights reserved
Prysmian Technical Data Sheets - Continued 1. Stranded Copper 2. Semi-Conducting Screen 3. XLPE Insulation 4. Bonded Semi-Conducting Screen 5. mm² Copper Wire Screen 6. Binder tape 7. Red LLDPE Sheath Prysmian 6350/11000 Volt Triplex Cable XLPE insulation Stranded copper conductor Copper wire screened UK Power Networks Standard EDS 02-0940 Nominal cross-sectional area mm² 185 300 Approximate diameter over conductor Mm 16.1 20.6 Approximate thickness of conductor screen mm 0.3 0.3 Minimum average thickness of insulation mm 3.4 3.4 Nominal area of copper wire screen Number of wires Nominal diameter of wires mm² mm 38 1.53 Minimum average thickness of oversheath mm 1.9 2.1 38 1.53 Approximate overall diameter of Single Core mm 33.0 38.0 Approximate overall diameter of Triplex Cable mm.5 81.6 Approximate cable weight kg/m 8.4 11.7 Minimum bending radius mm 0 750 Maximum pulling tension on Triplex Group kg 925 1500 Nominal internal diameter of duct mm 125 125 Maximum DC screen resistance @ 20 C /km 0.271 0.271 Approximate Capacitance (C) µf/km 0.421 0.512 Maximum DC resistance (R) @ 20 C /km 0.0991 0.0601 Maximum AC resistance (R ) @ 90 C /km 0.128 0.079 Inductance (L) @ 50Hz @ 90 C mh/km 0.331 0.30 Reactance (X) @ 50Hz @ 90 C /km 0.105 0.098 Zero Sequence Resistance /km 0.371 0.332 Zero Sequence Reactance /km 0.049 0.025 Positive Sequence Resistance /km 0.128 0.079 Positive Sequence Reactance /km 0.104 0.078 Short circuit ratings 1 Second Short Circuit of (90 to 250 C) ka 26.5 42.9 1 Second Short Circuit of Copper wire screen (80 to 250 C) ka 13.1 13.1 10 of 14 UK Power Networks 2012 All rights reserved
Appendix A Cable s for Widely Used Installation Conditions A.1 Single Circuit Laid Direct 600mm mmm m 257 4.89 321 6.11 366 6.96 464 8.83 185mm 2 Cu 465 8.85 590 11.23 475 9.04 609 11.59 300mm 2 Cu 597 11.36 766 14.58 295 5.61 360 6.85 422 8.03 524 9.97 185mm 2 Cu 536 10.20 665 12.65 548 10.43 689 13.11 300mm 2 Cu 688 13.09 867 16.50 11 of 14 UK Power Networks 2012 All rights reserved
A.2 Double Circuit laid Direct (Both circuits loaded at the same time) 600mm mmm m 300mm 248 4.72 309 5.88 351 6.68 446 8.49 185mm 2 Cu 414 7.88 526 10.01 454 8.64 582 11.08 300mm 2 Cu 5 10.85 732 13.93 287 5.46 350 6.67 409 7.78 508 9.66 185mm 2 Cu 519 9.88 644 12.26 529 10.07 666 12.67 300mm 2 Cu 665 12.65 837 15.94 12 of 14 UK Power Networks 2012 All rights reserved
A.3 Ducted Single Circuit 600mm mmm m 207 3.94 237 4.51 293 5.58 340 6.47 185mm 2 Cu 369 7.02 432 8.22 379 7.21 444 8.45 300mm 2 Cu 476 9.06 557 10.60 222 4.22 246 4.68 316 6.01 354 6.74 185mm 2 Cu 401 7.63 449 8.54 410 7.80 463 8.81 300mm 2 Cu 515 9.80 581 11.06 13 of 14 UK Power Networks 2012 All rights reserved
A.4 Ducted Double Circuit (Both circuits loaded at the same time) 600mm mmm m 300mm 202 3.84 232 4.41 286 5.44 333 6.34 185mm 2 Cu 334 6.36 382 7.27 3 7.04 433 8.24 300mm 2 Cu 465 8.85 544 10.35 218 4.15 242 4.60 311 5.91 348 6.62 185mm 2 Cu 394 7.50 441 8.40 403 7.67 455 8.66 300mm 2 Cu 506 9.63 571 10.87 14 of 14 UK Power Networks 2012 All rights reserved