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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 Date: 03/12/2012
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
Contents
1
Introduction ... 3
2
Scope ... 3
3
Details ... 3
3.1
Standard Drum Lengths, Sizes and Weights ... 3
3.2
Current Rating Table for Triplex Cables ... 4
3.3
Current Rating Tables for Comparison with Existing Designs ... 5
3.3.1 Three core Belted PILC Cables with Copper Conductors ... 5
3.3.2 Three core Belted PILC Cables with Aluminium Conductors ... 5
3.3.3 Three core PICAS Cables with Aluminium Conductors ... 5
3.3.4
Single core Poly laminate Cables laid in Trefoil with Solid Aluminium Conductors ... 6
3.3.5 Single core Polymeric Cables laid in Trefoil with Solid Aluminium Conductors ... 6
3.3.6
Single core Polymeric Cables laid in Trefoil with Stranded Copper Conductors ... 6
3.4
Nexans Technical Data Sheets... 7
3.5
Prysmian Technical Data Sheets ... 9
Appendix A – Cable Ratings 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
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
2aluminium single core XLPE cable laid up in triplex format;
185mm
2aluminium single core XLPE cable laid up in triplex format;
185mm
2copper single core XLPE cable laid up in triplex format;
300mm
2aluminium single core XLPE cable laid up in triplex format;
300mm
2copper 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.
Conductor Size (mm)
Standard Drum Length (m)
Manufacturer Standard Drum Dimensions (mm) Standard Drum Weight (kg) 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 1270 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
3.2
Current Rating Table for Triplex Cables
This table provides a guide to the current ratings for triplex cables. All the ratings quoted are
Distribution Ratings for 1 single triplex cable only and are in accordance with Engineering
Recommendation P17. The MVA ratings are for a three-phase supply. Ratings for multiple
cable circuits should be calculated individually. Appendix A of this document provides ratings
for the more commonly used types of installation:
Conductor Area mm²
Summer Distribution Current Rating 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
95 Al 185 Al 185 Cu 300 Al 300 Cu 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 Conductor Area mm²
Winter Distribution Current Rating 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
95 Al 185 Al 185 Cu 300 Al 300 Cu 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
3.3
Current Rating 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 Summer Distribution
Ratings 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 Conductors
Conductor Area in²
Distribution Current Rating per Conductor
600mm depth of cover, g = 1.2C m/watt. Ground / Air temp = 15C
Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 0.0225 0.04 0.06 0.10 0.15 0.20 0.25 0.30 0.40 0.50 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 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 300mm2 Al 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 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 300mm2 Al 300mm2 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 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 300mm2 Al
* shaded from solar radiation
3.3.2
Three core Belted PILC Cables with Aluminium Conductors
Conductor Area
Distribution Current Rating per Conductor
600mm depth of cover, g = 1.2C m/watt. Ground / Air temp = 15C
Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 0.0225in² 0.04in² 0.06in² 0.10in² 0.15in² 0.20in² 0.25in² 0.30in² 0.40in² 0.50in² 75 104 133 180 226 271 311 352 421 476 1.43 1.98 2.53 3.43 4.30 5.16 5.92 6.70 8.01 9.06 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 59 81 103 139 174 208 237 268 318 359 1.12 1.54 1.96 2.65 3.31 3.96 4.51 5.10 6.05 6.83 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al 43 93 118 162 204 246 284 324 390 444 0.82 1.77 2.25 3.08 3.88 4.68 5.40 6.17 7.42 8.45 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al 185mm2 Al 95mm² 185mm² 240mm² 300mm² 233 351 414 473 4.43 6.68 7.88 9.00 95mm2 Al 185mm2 Al 185mm2 Al 185mm2 Al 176 262 307 349 3.35 4.99 5.84 6.64 95mm2 Al 95mm2 Al 95mm2 Al 185mm2 Al 210 321 381 439 4.00 6.11 7.25 8.35 95mm2 Al 95mm2 Al 185mm2 Al 185mm2 Al
*shaded from solar radiation
3.3.3
Three core PICAS Cables with Aluminium Conductors
Conductor Area
Distribution Current Rating per Conductor
600mm depth of cover, g = 1.2C m/watt. Ground / Air temp = 15C
Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 95mm² 185mm² 300mm² 245 359 474 4.65 6.83 9.02 95mm2 Al 185mm2 Al 300mm2 Al 180 269 358 3.60 5.12 6.81 95mm2 Al 95mm2 Al 185mm2 Al 217 326 439 3.90 6.20 8.35 95mm2 Al 185mm2 Al 185mm2 Al
3.3.4
Single core Poly laminate Cables laid in Trefoil with Solid Aluminium Conductors
Conductor Area
Distribution Current Rating per Conductor
600mm depth of cover, g = 1.2C m/watt. Ground / Air temp = 15C
Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 150mm² 240mm² 410 540 7.80 10.28 185mm2 Al 300mm2 Al 315 415 5.99 7.90 185mm2 Al 300mm2 Al 360 520 6.85 9.90 185mm2 Al 300mm2 Al
*shaded from solar radiation
3.3.5
Single core Polymeric Cables laid in Trefoil with Solid Aluminium Conductors
Conductor Area
Distribution Current Rating per Conductor
600mm depth of cover, g = 1.2C m/watt. Ground / Air temp = 15C
Laid Direct in ground Installed in ducts Installed in Free air* Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 70mm² 150mm² 185mm² 240mm² 300mm² 266 405 459 534 606 5.06 7.71 8.73 10.16 11.53 95mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 300mm2 Al 198 298 338 392 442 3.77 5.67 6.43 7.46 8.41 95mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 300mm2 Al 256 400 458 540 619 4.87 7.61 8.72 10.28 11.78 95mm2 Al 185mm2 Al 185mm2 Al 300mm2 Al 300mm2 Al
*shaded from solar radiation
3.3.6
Single core Polymeric Cables laid in Trefoil with Stranded Copper Conductors
Conductor Area
Distribution Current Rating per Conductor
600mm depth of cover, g = 1.2C m/watt. Ground / Air temp = 15C Laid Direct in ground Installed in ducts Installed in air Amps MVA Triplex Amps MVA Triplex Amps MVA Triplex 185mm² 240mm² 300mm² 595 687 776 11.32 13.07 14.77 300mm2 Al 300mm2 Cu 300mm2 Cu 436 502 565 8.30 9.55 10.75 300mm2 Al 300mm2 Cu 300mm2 Cu 599 700 801 11.40 13.32 15.24 300mm2 Al 300mm2 Cu 300mm2 Cu
3.4
Nexans Technical Data Sheets
Nexans 6350/11000 Volt Triplex Cable XLPE insulation
Stranded aluminium conductor Copper wire screened
UK Power Networks Standard EDS 02-0940
1. Stranded Aluminium Conductor
2. Semi-Conducting Screen
3. XLPE Insulation
4. Bonded Semi-Conducting Screen
5. 35 or 70mm² Copper Wire Screen
6. Binder tape
7. Red LLDPE Sheath
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 70 0.80 70 70 1.13 70 70 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 2700 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 Rating of Conductor (90 to 250°C) kA 9.2 17.9 28.8 1 Second Short Circuit Rating of Copper wire screen (80 to
Nexans Technical Data Sheets - Continued
Nexans 6350/11000 Volt Triplex Cable XLPE insulation
Stranded copper conductor Copper wire screened
UK Power Networks Standard EDS 02-0940
1. Stranded Copper Conductor
2. Semi-Conducting Screen
3. XLPE Insulation
4. Bonded Semi-Conducting Screen
5. 70mm² Copper Wire Screen
6. Binder tape
7. Red LLDPE Sheath
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
mm² mm
70 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 570
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 Rating of Conductor (90 to 250°C) kA 43.3 1 Second Short Circuit Rating of Copper wire screen (80 to
3.5
Prysmian Technical Data Sheets
Prysmian 6350/11000 Volt Triplex Cable XLPE insulation
Stranded aluminium conductor Copper wire screened
UK Power Networks Standard EDS 02-0940
1. Stranded Aluminium Conductor
8. Semi-Conducting Screen
9. XLPE Insulation
10. Bonded Semi-Conducting Screen
11. 35 or 70mm² Copper Wire Screen
12. Binder tape
13. Red LLDPE Sheath
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 70 38 1.53 70 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 2700 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 Rating of Conductor (90 to 250°C) kA 9.2 17.9 28.8 1 Second Short Circuit Rating of Copper wire screen (80 to
Prysmian Technical Data Sheets - Continued
Prysmian 6350/11000 Volt Triplex Cable XLPE insulation
Stranded copper conductor Copper wire screened
UK Power Networks Standard EDS 02-0940
1. Stranded Copper Conductor
2. Semi-Conducting Screen
3. XLPE Insulation
4. Bonded Semi-Conducting Screen
5. 70mm² Copper Wire Screen
6. Binder tape
7. Red LLDPE Sheath
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 70 38 1.53 70 38 1.53 Minimum average thickness of oversheath mm 1.9 2.1 Approximate overall diameter of Single Core mm 33.0 38.0 Approximate overall diameter of Triplex Cable mm 70.5 81.6
Approximate cable weight kg/m 8.4 11.7
Minimum bending radius mm 700 750
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 Rating of Conductor (90 to 250°C) kA 26.5 42.9 1 Second Short Circuit Rating of Copper wire screen (80 to
Appendix A – Cable Ratings for Widely Used Installation Conditions
A.1
Single Circuit – Laid Direct
Conductor Size & Material Summer Continuous Rating (A) Summer Continuous Rating (MVA) Summer Distribution Rating (A) Summer Distribution Rating (MVA) 95mm2 Al 257 4.89 321 6.11 185mm2 Al 366 6.96 464 8.83 185mm2 Cu 465 8.85 590 11.23 300mm2 Al 475 9.04 609 11.59 300mm2 Cu 597 11.36 766 14.58 Conductor Size & Material Winter Continuous Rating (A) Winter Continuous Rating (MVA) Winter Distribution Rating (A) Winter Distribution Rating (MVA) 95mm2 Al 295 5.61 360 6.85 185mm2 Al 422 8.03 524 9.97 185mm2 Cu 536 10.20 665 12.65 300mm2 Al 548 10.43 689 13.11 300mm2 Cu 688 13.09 867 16.50 600mm
