213. Heat loss per meter for a typical 800mm2 offshore HVAC 33kV 3-core cable is 40W/m.
5.4.11.14 Inter-array cables: installation and burial method
214. For smaller inter-array cable sizes it is possible to use barges to lay the cable and these are generally at multiple short lengths.
215. The cables would be supplied on drums, cages or carousels on board a cable vessel or barge.
216. Each section of cable is laid from the cable lay vessel either from a static coil or a revolving turn carousel, turntable or drum depending upon the characteristics of the cable. The cable is led via a cable pick-up arrangement and an associated cable track way through linear cable engines and is led over board through a cable chute or stinger usually mounted at the stern of the vessel.
217. The cable would be pulled into the foundation via a J-tube (or alternative cable entry system), and later connected to the wind turbine. The rest of the cable would be laid along the sea bed and at the next wind turbine the cable would be again pulled into the foundation and later connected to the wind turbine.
218. Due to the water depths, it is not planned to use divers for any installation work. ROVs will be used when needed.
219. The inter-array cables would be installed using a mix of the following methods. See section 5.4.11.4 for details of these methods:
Surface lay; Ploughing; Pre-trenching or cutting; and Jetting.
5.4.11.15 Inter- array cable protection
220. In some cases the above methods cannot be applied and it is necessary to use alternative methods other than burial (for details see section 5.4.11.6):
Rock placement; Concrete mattresses; Frond mattresses; or
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 49
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114