EDS 02-0032 11kV & 33kV XLPE Transformer Tail...

Document Number: EDS 02-0032

Version: 2.3

Date: 26/10/2016

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ENGINEERING DESIGN STANDARD

EDS 02-0032

11KV & 33KV XLPE TRANSFORMER TAIL CABLE RATINGS

Network(s): EPN, LPN, SPN

Summary: This standard details the technical and practical information required for the safe, effective installation and use of all 11kV and 33kV transformer tails.

Author: Jesse Garcia Date: 26/10/2016

Approved By: Paul Williams Approved Date: 01/11/2016

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 the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue.

Applicable To

UK Power Networks External

All UK Power Networks G81 Website

Asset Management Contractors

Capital Programme ICPs/IDNOs

Connections Meter Operators

HSS&TT

Network Operations

UK Power Networks Services

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11kV & 33kV XLPE Transformer Tail Cable Ratings


Version: 2.3

Date: 26/10/2016

© UK Power Networks 2017 All rights reserved 2 of 36

Revision Record

Version 2.3 Review Date 01/11/2021

Date 01/09/2017 Author Paul Williams

Why has the document been updated – Minor version update

What has changed – Correction of figure typo on table within section 3.1.2 (Winter Ratings).


Date 07/02/2017 Author Paul Williams


What has changed – Correction of figure typo on table within section 3.1.2 (Winter Ratings) and table within appendix A.2.3 Single Point Bonded Summer Ratings per Circuit (Two Cable per phase) (Summer Continuous Rating).


Date 07/12/2016 Author Lee Strachan


What has changed – correction of formatting on table within section 3.1.2 (Winter Ratings).


Date 26/10/2016 Author Jesse Garcia

Why has the document been updated – Periodic review

What has changed – Reviewed and updated to reflect the design changes made to the 11kV and 33kV single core XLPE cables sourced by UK Power Networks. All sections updated to reflect all types of cable now having aluminium conductors and aluminium wire screens.

Document title revised and document transferred onto a new template and rules applied.


Date 02/07/2012 Author Michael Sinclair

Original Issue



Version: 2.3

Date: 26/10/2016


Contents

1 Introduction ............................................................................................................. 4

2 Scope ....................................................................................................................... 4

2.1 11kV Cables .............................................................................................................. 4

2.2 33V Cables ................................................................................................................ 4

3 Details ...................................................................................................................... 5

3.1 Current Rating Table for Single Core 11kV Transformer Tail Cables ......................... 5

3.1.1 Summer Ratings ........................................................................................................ 5

3.1.2 Winter Ratings ........................................................................................................... 5

3.2 Current Rating Table for Single Core 33kV Transformer Tail Cables ......................... 6

3.2.1 Summer Ratings ........................................................................................................ 6

3.2.2 Winter Ratings ........................................................................................................... 6

4 11kV Single Core Cable Datasheets ....................................................................... 7

4.1 Cable Details and Drawing ........................................................................................ 7

4.2 Typical 630mm2, 800mm2 and 1000mm2 Technical Data Sheets ............................... 8

4.3 Typical 1200mm2 Technical Data Sheet .................................................................... 9

5 33kV Single Core Cables ....................................................................................... 10

5.1 Cable Details and Drawing ...................................................................................... 10

5.2 Typical 300mm2, 500mm2 and 630mm2 Technical Data Sheets ............................... 11

5.3 Typical 1000mm2 and 1200mm2 Technical Data Sheets .......................................... 12

6 References ............................................................................................................. 12

Appendix A 11kV Transformer Tail Cable Ratings ......................................................... 13

A.1 Laid Direct Circuits – Single Circuit .......................................................................... 13

A.2 Laid Direct Circuits – Double Circuit ........................................................................ 15

A.3 Laid Direct Circuits – Triple Circuit ........................................................................... 17

A.4 Ducted Circuits – Single Circuit ............................................................................... 19

A.5 Ducted Circuits – Double Circuit .............................................................................. 21

A.6 Ducted Circuits – Triple Circuit ................................................................................ 23

Appendix B 33kV Transformer Tail Cable Ratings ......................................................... 25

B.1 Laid Direct Circuits – Single Circuit .......................................................................... 25

B.2 Laid Direct Circuits – Double Circuit ........................................................................ 27

B.3 Laid Direct Circuits – Triple Circuit ........................................................................... 29

B.4 Ducted Circuits – Single Circuit ............................................................................... 31

B.5 Ducted Circuits – Double Circuit .............................................................................. 33

B.6 Ducted Circuits – Triple Circuit ................................................................................ 35



Version: 2.3

Date: 26/10/2016


1 Introduction

The purpose of this engineering standard is to provide designers, installers and operators with the necessary technical and practical information required to enable the safe and efficient installation of both 11kV and 33kV transformer tails within UK Power Networks.

2 Scope

2.1 11kV Cables

This document covers all 11kV single XLPE core cables in trefoil formation in both laid direct and ducted installations for use as transformer tails:

630mm2 aluminium single core XLPE cable with 115mm2 aluminium wire screen;



1200mm2 aluminium single core XLPE cable with 115mm2 aluminium wire screen.

2.2 33V Cables

This document covers all 33kV single XLPE core cables in trefoil formation in both laid direct and ducted installations for use as transformer tails:





1200mm2 aluminium single core XLPE cable with 82mm2 aluminium wire screen.



Version: 2.3

Date: 26/10/2016


3 Details

3.1 Current Rating Table for Single Core 11kV Transformer Tail Cables

This table provides a guide to the current ratings for 11kV single core XLPE cables laid in trefoil formation. All the ratings quoted are Distribution Ratings for one single core transformer tail only and are calculated 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:

3.1.1 Summer Ratings

Conductor Size mm²

Summer Distribution Current Rating per Cable (solidly bonded)

Based on a 600mm depth of cover

Summer Continuous Current Rating per Cable (solidly bonded)

Laid direct in ground Installed in ducts Installed in Free air (Shaded from Solar Radiation)

Amps MVA Amps MVA Amps MVA

630 Al

800 Al

1000 Al

1200 Al

809

907

1006

1064

15.40

17.26

19.14

20.25

661

731

802

847

12.58

13.91

15.26

16.12

775

868

962

1016

14.75

16.52

18.31

19.33

3.1.2 Winter Ratings

Conductor Size mm²

Winter Distribution Current Rating per Cable (solidly bonded)


Winter Continuous Current Rating per Cable (solidly bonded)

Laid direct in ground Installed in ducts Installed in Free air (Shaded from Solar Radiation)


630 Al

800 Al

1000 Al

1200 Al

950

1066

1183

1254

18.08

20.29

22.51

23.86

732

813

893

945

13.93

15.47

16.99

17.98

902

1012

1121

1187

17.17

19.26

21.33

22.59



Version: 2.3

Date: 26/10/2016


3.2 Current Rating Table for Single Core 33kV Transformer Tail Cables

This table provides a guide to the current ratings for 33kV single core XLPE cables. All the ratings quoted are Distribution Ratings for one single core transformer tail only and are calculated in accordance with Engineering Recommendation P17. The MVA ratings are for a three-phase supply. Details for multiple cable circuits are listed in appendix A:

3.2.1 Summer Ratings

Conductor Area mm²

Summer Distribution Current Rating per Cable (solidly bonded)


Summer Continuous Current Rating per Cable (solidly bonded)

Laid Direct in Ground

Installed in Ducts Installed in Free Air (shaded from solar radiation)


300 Al

500 Al

630 Al

1000 Al

1200 Al

531

688

783

979

1051

30.31

39.28

44.70

55.89

60.00

497

623

700

857

923

28.37

35.57

39.96

48.93

52.69

529

685

780

977

1050

30.20

39.11

44.53

55.78

59.94

3.2.2 Winter Ratings

Conductor Area mm²

Winter Distribution Current Rating per Cable (solidly bonded)


Winter Continuous Current Rating per Cable (solidly bonded)

Laid Direct in Ground

Installed in Ducts Installed in Free Air (shaded from solar radiation)


300 Al

500 Al

630 Al

1000 Al

1200 Al

613

797

910

1143

1228

35.00

45.50

51.95

65.25

70.11

550

693

781

964

1040

31.40

39.56

44.59

55.03

59.37

606

787

899

1128

1214

34.60

44.93

51.32

64.40

69.31



Version: 2.3

Date: 26/10/2016


4 11kV Single Core Cable Datasheets

4.1 Cable Details and Drawing

1. Solid or water blocked stranded aluminium conductor 2. Semi-conducting conductor screen 3. XLPE insulation 4. Semi-conducting insulation screen 5. Semi-conducting water swellable tape 6. Concentric layer of aluminium screen wires 7. Water swellable tape 8. Aluminium equalising tape applied in opposite direction to screen wires 9. Red PE or LSZH outer sheath



Version: 2.3

Date: 26/10/2016


4.2 Typical 630mm2, 800mm2 and 1000mm2 Technical Data Sheets

Nominal cross-sectional area mm² 630 800 1000

Dimensional data

Approximate diameter over conductor mm 30.0 34.0 38.1

Minimum thickness of conductor screen mm 0.30 0.30 0.30

Approximate thickness of insulation mm 3.40 3.40 3.40

Approximate thickness of Insulation screen mm 0.50 0.50 0.50

Approximate diameter over insulation screen mm 39.0 43.0 47.1

Nominal area of aluminium wire screen

Number of wires

Nominal diameter of wires

mm²

mm

115

36

2.03

115

36

2.03

115

36

2.03

Minimum thickness of oversheath mm 1.94 2.02 2.11

Approximate overall diameter of Single Core mm 50.0 54.0 59.0

Approximate cable weight kg/m 2.90 3.50 4.11

Minimum bending radius mm 1000 1080 1170

Maximum pulling tension on Single Core Conductor kN 18.5 23.5 29.0

Nominal internal diameter of duct (1 x single Core) mm 100 100 125

Electrical data

Maximum DC AWS resistance @ 20°C /km 0.253 0.253 0.253

Approximate Capacitance (C) µF/km 0.740 0.830 0.920

Maximum DC conductor resistance (R) @ 20°C /km 0.0469 0.0367 0.0291

Maximum AC conductor resistance (R’) @ 90°C /km 0.0600 0.0470 0.0420

Reactance (X) @ 50Hz @ 90°C /km 0.09 0.09 0.08

Short circuit ratings

1 Second Short Circuit Rating of Conductor (90 to 250°C)

kA 59.2 75.2 94.0

1 Second Short Circuit Rating of Copper wire screen (80 to 250°C)

kA 13.1 13.1 13.1



Version: 2.3

Date: 26/10/2016


4.3 Typical 1200mm2 Technical Data Sheet

Nominal cross-sectional area mm² 1200

Dimensional data

Approximate diameter over conductor mm 39.90

Minimum thickness of conductor screen mm 0.30

Approximate thickness of insulation mm 3.40

Approximate thickness of Insulation screen mm 0.50

Approximate diameter over insulation screen mm 48.9


Number of wires


mm²

mm

115

36

2.03

Minimum thickness of oversheath mm 2.20

Approximate overall diameter of Single Core mm 61.0

Approximate cable weight kg/m 4.68

Minimum bending radius mm 1210

Maximum pulling tension on Single Core Conductor kN 35

Nominal internal diameter of duct (1 x single Core) mm 125

Electrical data

Maximum DC AWS resistance @ 20°C /km 0.253

Approximate Capacitance (C) µF/km 0.960

Maximum DC conductor resistance (R) @ 20°C /km 0.524

Maximum AC conductor resistance (R’) @ 90°C /km 0.668

Reactance (X) @ 50Hz @ 90°C /km 0.08


1 Second Short Circuit Rating of Conductor (90 to 250°C) kA 112.8


kA 13.1



Version: 2.3

Date: 26/10/2016


5 33kV Single Core Cables

5.1 Cable Details and Drawing

1. Solid or water blocked stranded aluminium conductor 2. Semi-conducting conductor screen 3. XLPE insulation 4. Semi-conducting insulation screen 5. Semi-conducting water swellable tape 6. Concentric layer of aluminium screen wires 7. Water swellable tape 8. Aluminium equalising tape applied in opposite direction to screen wires 9. Black PE or LSZH outer sheath 10. Semi-conducting outer layer



Version: 2.3

Date: 26/10/2016


5.2 Typical 300mm2, 500mm2 and 630mm2 Technical Data Sheets

Nominal cross-sectional area mm² 300 500 630

Dimensional data

Approximate diameter over conductor mm 20.30 26.10 30.00

Minimum thickness of conductor screen mm 0.30 0.30 0.30

Approximate thickness of insulation mm 8.00 8.00 8.00

Approximate thickness of Insulation screen mm 0.50 0.50 0.50

Approximate diameter over insulation screen mm 37.6 43.4 47.3


Number of wires


mm²

mm

82

36

1.71

82

36

1.71

82

36

1.71

Minimum thickness of oversheath mm 1.94 2.11 2.20

Approximate thickness of semi-conducting layer mm 0.7 0.7 0.7

Approximate overall diameter of Single Core mm 49.0 54.0 59.0

Approximate cable weight kg/m 2.195 2.89 3.45

Minimum bending radius mm 970 1080 1170

Maximum pulling tension on Single Core kN 8.8 14.7 18.5

Nominal internal diameter of duct (1 x single Core) mm 150 150 160

Electrical data

Maximum DC AWS resistance @ 20°C /km 0.379 0.379 0.379

Approximate Capacitance (C) µF/km 0.270 0.320 0.360

Maximum DC conductor resistance (R) @ 20°C /km 0.100 0.0605 0.0469

Maximum AC conductor resistance (R’) @ 90°C /km 0.1280 0.078 0.0600

Reactance (X) @ 50Hz @ 90°C /km 0.11 0.10 0.11


1 Second Short Circuit Rating of Conductor (90 to 250°C)

kA 28.2 47.0 59.2


kA 8.6 8.6 8.6



Version: 2.3

Date: 26/10/2016


5.3 Typical 1000mm2 and 1200mm2 Technical Data Sheets

6 References

ENA TS 97-01 Special Backfill Material for Cable Installations

Nominal cross-sectional area mm² 1000 1200

Dimensional Data

Approximate diameter over conductor mm 38.1 40.0

Approximate thickness of conductor screen mm 0.30 0.30

Approximate thickness of insulation mm 8.00 8.00

Approximate thickness of Insulation screen mm 0.50 0.50

Approximate diameter over insulation screen mm 55.5 57.3


Number of wires


mm²

mm

82

44

1.55

82

44

1.55

Approximate thickness of oversheath mm 2.45 2.54

Approximate thickness of semi-conducting layer mm 0.7 0.7

Approximate overall diameter of Single Core mm 67.0 69.0

Approximate cable weight kg/m 4.78 5.37

Minimum bending radius mm 1330 1380

Maximum pulling tension on Single Core kN 29.4 35.3

Nominal internal diameter of duct (1 x single Core) mm 160 160

Electrical data

Maximum DC AWS resistance @ 20°C /km 0.379 0.379

Approximate Capacitance (C) µF/km 0.449 0.460

Maximum DC conductor resistance (R) @ 20°C /km 0.0291 0.0247

Maximum AC conductor resistance (R’) @ 90°C /km 0.042 0.0370

Reactance (X) @ 50Hz @ 90°C /km 0.09 0.09


1 Second Short Circuit Rating of Conductor (90 to 250°C) kA 94.0 112.8


kA 8.6 8.6



Version: 2.3

Date: 26/10/2016


Appendix A 11kV Transformer Tail Cable Ratings

A.1 Laid Direct Circuits – Single Circuit

A.1.1 Solidly Bonded Summer Ratings

Conductor Size and Material

Summer Continuous Rating (A)

Summer Continuous

Rating (MVA)

Summer Distribution Rating (A)

Summer Distribution

Rating (MVA)

630mm2 Al 699 13.30 809 15.40

800mm2 Al 780 14.84 907 17.26

1000mm2 Al 861 16.38 1006 19.14

1200mm2 Al 908 17.28 1064 20.25

A.1.2 Solidly Bonded Winter Ratings


Winter Continuous Rating (A)

Winter Continuous

Rating (MVA)

Winter Distribution Rating (A)

Winter Distribution

Rating (MVA)

630mm2 Al 817 15.55 950 18.08

800mm2 Al 912 17.36 1066 20.29

1000mm2 Al 1008 19.18 1183 22.51

1200mm2 Al 1064 20.25 1254 23.86

600mm

11kV



Version: 2.3

Date: 26/10/2016


A.1.3 Single Point Bonded Summer Ratings



Summer Continuous

Rating (MVA)


Summer Distribution

Rating (MVA)

Maximum Length (km)

Allowed

630mm2 Al 744 14.16 860 16.37 1.23

800mm2 Al 839 15.97 975 18.55 1.13

1000mm2 Al 941 17.91 1098 20.89 1.04

1200mm2 Al 1002 19.07 1173 22.32 0.95

A.1.4 Single Point Bonded Winter Ratings



Winter Continuous

Rating (MVA)


Winter Distribution

Rating (MVA)

Maximum Length (km)

Allowed

630mm2 Al 868 16.52 1007 19.16 1.23

800mm2 Al 981 18.67 1144 21.77 1.13

1000mm2 Al 1100 20.93 1287 24.49 1.04

1200mm2 Al 1173 22.32 1378 26.22 0.95



Version: 2.3

Date: 26/10/2016


A.2 Laid Direct Circuits – Double Circuit

A.2.1 Solidly Bonded Summer Ratings per Circuit (Two Cable per phase)



Summer Continuous Rating (MVA)


Summer Distribution Rating (MVA)

630mm2 Al 1188 22.61 1480 28.16

800mm2 Al 1318 25.08 1654 31.48

1000mm2 Al 1450 27.59 1830 34.82

1200mm2 Al 1526 29.04 1930 36.73

A.2.2 Solidly Bonded Winter Ratings per Circuit (Two Cable per phase)



Winter Continuous Rating (MVA)


Winter Distribution Rating (MVA)

630mm2 Al 1532 29.15 1762 33.53

800mm2 Al 1708 32.50 1978 37.64

1000mm2 Al 1884 35.85 2194 41.75

1200mm2 Al 1986 37.79 2324 44.23

300mm

600mm

11kV



Version: 2.3

Date: 26/10/2016


A.2.3 Single Point Bonded Summer Ratings per Circuit (Two Cable per phase)






Maximum Length (km) Allowed

630mm2 Al 1390 26.45 1572 29.92 1.23

800mm2 Al 1566 29.80 1778 33.84 1.13

1000mm2 Al 1754 33.38 1998 38.02 1.04

1200mm2 Al 1866 35.51 2132 40.57 0.95

A.2.4 Single Point Bonded Winter Ratings per Circuit (Two Cable per phase)







630mm2 Al 1628 30.98 1850 35.21 1.23

800mm2 Al 1838 34.98 2096 39.89 1.13

1000mm2 Al 2058 39.16 2354 44.80 1.04

1200mm2 Al 2192 41.71 2514 47.84 0.95



Version: 2.3

Date: 26/10/2016


A.3 Laid Direct Circuits – Triple Circuit

A.3.1 Solidly Bonded Summer Ratings per Circuit (Three Cable per phase)






630mm2 Al 1635 31.11 2061 39.22

800mm2 Al 1821 34.65 2298 43.73

1000mm2 Al 2010 38.25 2538 48.30

1200mm2 Al 2121 40.36 2673 50.87

A.3.2 Solidly Bonded Winter Ratings per Circuit (Three Cable per phase)






630mm2 Al 1866 35.51 2433 46.30

800mm2 Al 2067 39.34 2718 51.72

1000mm2 Al 2268 43.16 3003 57.15

1200mm2 Al 2382 45.33 3168 60.29

300mm 300mm

600mm

11kV



Version: 2.3

Date: 26/10/2016


A.3.3 Single Point Bonded Summer Ratings per Circuit (Three Cable per phase)







630mm2 Al 1686 32.08 2193 41.73 1.23

800mm2 Al 1890 35.97 2475 47.10 1.13

1000mm2 Al 2109 40.13 2775 52.81 1.04

1200mm2 Al 2235 42.53 2955 56.23 0.95

A.3.4 Single Point Bonded Winter Ratings per Circuit (Three Cable per phase)







630mm2 Al 1989 37.85 2586 49.21 1.23

800mm2 Al 2232 42.47 2922 55.61 1.13

1000mm2 Al 2487 47.33 3279 62.40 1.04

1200mm2 Al 2637 50.18 3495 66.51 0.95



Version: 2.3

Date: 26/10/2016


A.4 Ducted Circuits – Single Circuit

A.4.1 Solidly Bonded Summer Ratings






630mm2 Al 569 10.83 661 12.58

800mm2 Al 625 11.89 731 13.91

1000mm2 Al 681 12.69 802 15.26

1200mm2 Al 716 13.63 847 16.12

A.4.2 Solidly Bonded Winter Ratings






630mm2 Al 635 12.08 732 13.93

800mm2 Al 699 13.30 813 15.47

1000mm2 Al 763 14.52 893 16.99

1200mm2 Al 804 15.30 945 17.98

600mm

11kV



Version: 2.3

Date: 26/10/2016


A.4.3 Single Point Bonded Summer Ratings







630mm2 Al 723 13.76 830 15.79 0.70

800mm2 Al 820 15.60 945 17.98 0.66

1000mm2 Al 918 17.47 1063 20.23 0.49

1200mm2 Al 990 18.84 1150 21.88 0.47

A.4.4 Single Point Bonded Winter Ratings







630mm2 Al 635 12.08 732 13.93 0.70

800mm2 Al 699 13.30 813 15.47 0.66

1000mm2 Al 763 14.52 893 16.99 0.49

1200mm2 Al 804 15.30 945 17.98 0.47



Version: 2.3

Date: 26/10/2016


A.5 Ducted Circuits – Double Circuit

A.5.1 Solidly Bonded Summer Ratings per Circuit (Two Cable per phase)






630mm2 Al 976 18.57 1066 20.29

800mm2 Al 1070 20.36 1172 22.30

1000mm2 Al 1162 22.11 1276 24.28

1200mm2 Al 1220 23.22 1340 25.50

A.5.2 Solidly Bonded Winter Ratings per Circuit (Two Cable per phase)






630mm2 Al 1170 22.27 1360 25.88

800mm2 Al 1292 24.59 1508 28.70

1000mm2 Al 1414 26.91 1654 31.48

1200mm2 Al 1492 28.39 1748 33.26

300mm

600mm

11kV



Version: 2.3

Date: 26/10/2016


A.5.3 Single Point Bonded Summer Ratings per Circuit (Two Cable per phase)







630mm2 Al 1246 23.71 1358 25.84 0.70

800mm2 Al 1408 26.79 1538 29.27 0.66

1000mm2 Al 1574 29.95 1722 32.77 0.49

1200mm2 Al 1694 32.24 1854 35.28 0.47

A.5.4 Single Point Bonded Winter Ratings per Circuit (Two Cable per phase)







630mm2 Al 1412 26.87 1708 32.50 0.70

800mm2 Al 1600 30.45 1946 37.03 0.66

1000mm2 Al 1790 34.06 2188 41.64 0.49

1200mm2 Al 1928 36.69 2368 45.06 0.47



Version: 2.3

Date: 26/10/2016


A.6 Ducted Circuits – Triple Circuit

A.6.1 Solidly Bonded Summer Ratings per Circuit (Three Cable per phase)






630mm2 Al 1302 24.78 1695 32.26

800mm2 Al 1425 27.12 1866 35.51

1000mm2 Al 1548 29.46 2040 38.82

1200mm2 Al 1620 30.83 2151 40.93

A.6.2 Solidly Bonded Winter Ratings per Circuit (Three Cable per phase)






630mm2 Al 1749 33.28 1914 36.42

800mm2 Al 1923 36.59 2118 40.31

1000mm2 Al 2097 39.91 2319 44.13

1200mm2 Al 2208 42.02 2448 46.59

300mm

600mm

11kV

300mm



Version: 2.3

Date: 26/10/2016


A.6.3 Single Point Bonded Summer Ratings per Circuit (Three Cable per phase)







630mm2 Al 1674 31.86 2142 40.76 0.60

800mm2 Al 1887 35.91 2430 46.24 0.56

1000mm2 Al 2106 40.08 2727 51.89 0.53

1200mm2 Al 2265 43.10 2943 56.01 0.50

A.6.4 Single Point Bonded Winter Ratings per Circuit (Three Cable per phase)







630mm2 Al 1917 36.48 2412 45.90 0.60

800mm2 Al 2166 41.22 2742 52.18 0.56

1000mm2 Al 2418 46.01 3081 58.63 0.53

1200mm2 Al 2601 49.50 3330 63.37 0.50



Version: 2.3

Date: 26/10/2016


Appendix B 33kV Transformer Tail Cable Ratings

Important: The following ratings are based on the required number of circuits or the ducts containing them, being installed in a Cement Bound Sand (CBS) backfill or an equivalent

material, with a dried out thermal resistivity of 1.2 C m/watt, as specified in ENA TS 97-01.

B.1 Laid Direct Circuits – Single Circuit

B.1.1 Solidly Bonded Summer Ratings






300mm2 Al 460 26.26 531 30.31

500mm2 Al 592 33.80 688 39.28

630mm2 Al 670 38.25 783 44.70

1000mm2 Al 829 47.33 979 55.89

1200mm2Al 887 50.64 1051 60.00

B.1.2 Solidly Bonded Winter Ratings






300mm2 Al 532 30.37 613 35.00

500mm2 Al 686 39.16 797 45.50

630mm2 Al 779 44.47 910 51.95

1000mm2 Al 966 55.15 1143 65.25

1200mm2Al 1035 59.09 1228 70.11

900mm

33kV



Version: 2.3

Date: 26/10/2016


B.1.3 Single Point Bonded Summer Ratings







300mm2 Al 471 26.89 543 31.00 2.20

500mm2 Al 614 35.05 712 40.65 1.70

630mm2 Al 701 40.02 818 46.70 1.50

1000mm2 Al 886 50.58 1043 59.54 1.20

1200mm2Al 954 54.46 1128 64.40 1.10

B.1.4 Single Point Bonded Winter Ratings







300mm2 Al 544 31.06 626 35.74 2.20

500mm2 Al 711 40.59 825 47.10 1.70

630mm2 Al 814 46.47 949 54.18 1.50

1000mm2 Al 1031 58.86 1214 69.31 1.20

1200mm2Al 1111 64.43 1314 75.02 1.10



Version: 2.3

Date: 26/10/2016


B.2 Laid Direct Circuits – Double Circuit

B.2.1 Solidly Bonded Summer Ratings per Circuit (Two Cable per phase)






300mm2 Al 858 48.98 968 55.26

500mm2 Al 1100 62.80 1248 71.25

630mm2 Al 1242 70.91 1418 80.95

1000mm2 Al 1530 87.35 1762 100.59

1200mm2Al 1632 93.17 1886 107.67

B.2.2 Solidly Bonded Winter Ratings per Circuit (Two Cable per phase)






300mm2 Al 996 56.86 1124 64.17

500mm2 Al 1280 73.08 1456 83.12

630mm2 Al 1450 82.78 1656 94.54

1000mm2 Al 1796 102.53 2066 117.95

1200mm2Al 1918 109.50 2216 126.51

300mm

900mm

33kV



Version: 2.3

Date: 26/10/2016


B.2.3 Single Point Bonded Summer Ratings per Circuit (Two Cable per phase)






Maximum Length (km)

300mm2 Al 796 45.44 990 56.52 1.87

500mm2 Al 1032 58.92 1294 73.87 1.50

630mm2 Al 1174 67.02 1482 84.61 1.36

1000mm2 Al 1470 83.92 1880 107.33 1.13

1200mm2Al 1576 89.97 2026 115.66 1.00

B.2.4 Single Point Bonded Winter Ratings per Circuit (Two Cable per phase)






Maximum Length (km)

300mm2 Al 928 52.98 1148 65.54 1.87

500mm2 Al 1206 68.85 1506 85.98 1.50

630mm2 Al 1374 78.44 1728 98.54 1.36

1000mm2 Al 1722 98.31 2200 125.60 1.13

1200mm2Al 1850 105.62 2376 135.65 1.00



Version: 2.3

Date: 26/10/2016


B.3 Laid Direct Circuits – Triple Circuit

B.3.1 Solidly Bonded Summer Ratings per Circuit (Three Cable per phase)






300mm2 Al 1035 59.09 1344 76.73

500mm2 Al 1314 75.02 1731 98.82

630mm2 Al 1479 84.44 1962 112.01

1000mm2 Al 1800 102.76 2424 138.39

1200mm2Al 1914 109.27 2592 147.98

B.3.2 Solidly Bonded Winter Ratings per Circuit (Three Cable per phase)






300mm2 Al 1212 69.19 1569 89.57

500mm2 Al 1542 88.03 2025 115.61

630mm2 Al 1737 99.17 2298 131.19

1000mm2 Al 2121 121.09 2856 163.05

1200mm2Al 2259 128.97 3054 174.35

300mm 300mm

900mm

33kV



Version: 2.3

Date: 26/10/2016


B.3.3 Single Point Bonded Summer Ratings per Circuit (Three Cable per phase)






Maximum Length (km)

300mm2 Al 1059 60.46 1377 78.61 1.87

500mm2 Al 1365 77.93 1794 102.42 1.50

630mm2 Al 1551 88.55 2052 117.15 1.35

1000mm2 Al 1932 110.30 2592 147.98 1.12

1200mm2Al 2067 118.01 2787 159.11 1.02

B.3.4 Single Point Bonded Winter Ratings per Circuit (Three Cable per phase)






Maximum Length (km)

300mm2 Al 1218 69.54 1575 89.92 1.87

500mm2 Al 1560 89.06 2037 116.29 1.50

630mm2 Al 1758 100.36 2316 132.22 1.35

1000mm2 Al 2160 123.31 2886 164.76 1.12

1200mm2Al 2301 131.36 3093 176.58 1.02



Version: 2.3

Date: 26/10/2016


B.4 Ducted Circuits – Single Circuit

B.4.1 Solidly Bonded Summer Ratings






300mm2 Al 401 22.89 466 26.60

500mm2 Al 514 29.34 602 34.37

630mm2 Al 581 33.17 684 39.05

1000mm2 Al 716 40.88 854 48.75

1200mm2Al 765 43.67 916 52.29

B.4.2 Solidly Bonded Winter Ratings






300mm2 Al 442 25.23 509 29.06

500mm2 Al 569 32.48 661 37.74

630mm2 Al 645 36.82 753 42.99

1000mm2 Al 799 45.61 945 53.95

1200mm2Al 854 48.75 1019 58.17

900mm

33kV



Version: 2.3

Date: 26/10/2016


B.4.3 Single Point Bonded Summer Ratings






Maximum Length (km)

300mm2 Al 410 23.41 476 27.17 1.87

500mm2 Al 534 30.49 624 35.62 1.50

630mm2 Al 609 34.77 715 40.82 1.35

1000mm2 Al 766 43.73 909 51.89 1.12

1200mm2Al 823 46.99 983 56.12 1.02

B.4.4 Single Point Bonded Winter Ratings






Maximum Length (km)

300mm2 Al 452 25.80 520 26.69 1.87

500mm2 Al 590 33.68 684 39.05 1.50

630mm2 Al 675 38.54 786 44.87 1.35

1000mm2 Al 853 48.70 1005 57.38 1.12

1200mm2Al 919 52.47 1089 62.17 1.02



Version: 2.3

Date: 26/10/2016


B.5 Ducted Circuits – Double Circuit

B.5.1 Solidly Bonded Summer Ratings per Circuit (Two Cable per phase)






300mm2 Al 704 40.19 760 43.39

500mm2 Al 898 51.27 974 55.61

630mm2 Al 1026 58.57 1118 63.83

1000mm2 Al 1258 71.82 1378 78.67

1200mm2Al 1338 76.39 1470 83.92

B.5.2 Solidly Bonded Winter Ratings per Circuit (Two Cable per phase)






300mm2 Al 796 45.44 962 54.92

500mm2 Al 1022 58.35 1248 71.25

630mm2 Al 1170 66.80 1452 82.89

1000mm2 Al 1448 82.67 1820 103.90

1200mm2Al 1548 88.38 1960 111.90

300mm

900mm

33kV



Version: 2.3

Date: 26/10/2016


B.5.3 Single Point Bonded Summer Ratings per Circuit (Two Cable per phase)






Maximum Length (km)

300mm2 Al 730 41.68 888 50.70 1.87

500mm2 Al 946 54.01 1158 66.11 1.50

630mm2 Al 1076 61.43 1358 77.53 1.35

1000mm2 Al 1346 76.84 1722 98.31 1.12

1200mm2Al 1442 82.32 1858 106.07 1.02

B.5.4 Single Point Bonded Winter Ratings per Circuit (Two Cable per phase)






Maximum Length (km)

300mm2 Al 810 46.24 1002 57.20 1.87

500mm2 Al 1050 59.94 1284 73.30 1.50

630mm2 Al 1212 69.19 1506 85.98 1.35

1000mm2 Al 1522 86.89 1918 109.50 1.12

1200mm2Al 1634 93.29 2076 118.52 1.02



Version: 2.3

Date: 26/10/2016


B.6 Ducted Circuits – Triple Circuit

B.6.1 Solidly Bonded Summer Ratings per Circuit (Three Cable per phase)






300mm2 Al 954 54.46 1227 70.05

500mm2 Al 1215 69.36 1305 74.50

630mm2 Al 1302 74.33 1647 94.03

1000mm2 Al 1497 85.46 1893 108.07

1200mm2Al 1767 100.88 2292 130.85

B.6.2 Solidly Bonded Winter Ratings per Circuit (Three Cable per phase)






300mm2 Al 1083 61.83 1419 81.01

500mm2 Al 1188 67.82 1761 100.54

630mm2 Al 1473 84.09 1833 104.65

1000mm2 Al 1695 96.77 2490 142.15

1200mm2Al 2028 115.78 2574 146.95

300mm 300mm

900mm

33kV



Version: 2.3

Date: 26/10/2016


B.6.3 Single Point Bonded Summer Ratings per Circuit (Three Cable per phase)






Maximum Length (km)

300mm2 Al 978 55.83 1311 74.84 1.87

500mm2 Al 1263 72.10 1632 1632 1.50

630mm2 Al 1431 81.70 1863 106.36 1.35

1000mm2 Al 1782 101.73 1986 113.38 1.12

1200mm2Al 1908 108.93 2445 139.59 1.02

B.6.4 Single Point Bonded Winter Ratings per Circuit (Three Cable per phase)






Maximum Length (km)

300mm2 Al 1110 63.37 1395 79.64 1.87

500mm2 Al 1221 69.71 1479 84.44 1.50

630mm2 Al 1635 93.34 1902 108.59 1.35

1000mm2 Al 1788 102.08 2211 126.23 1.12

1200mm2Al 2151 122.80 2745 156.71 1.02

EDS 02-0032 11kV & 33kV XLPE Transformer Tail...

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