Diagram 5.11 General cutaway of a XLPE HVDC land cable4


Table 5.26 Typical HVDC XLPE ± 320 kV aluminium land cable details5 Details


1,000 mm2


Overall diameter (mm)


Weight (kg/m) 101 9 1,200 mm2 105 10 1,600 mm2 112 12


2,000 mm2 118 14 311. Heat loss per metre for a typical 2,400mm2 DC land cable at full load is 90W/m


5.6.2 Onshore Site Description 312. The onshore cable route is approximately 37km long and is shown in Figure 1.3. The route was determined during the development of the onshore electricity transmission works for East Anglia ONE. The onshore cable route was designed to be sufficient to place cables for two future projects. East Anglia THREE would therefore follow the same East Anglia ONE onshore cable route. From the outset (during the East Anglia ONE planning process) careful routeing of the onshore electrical transmission works has set out to avoid key areas of sensitivity wherever possible, as listed below:


 Burying of the cable(s) throughout its length to minimise visual impact.


 Careful routeing of the cable route tominimise distance within the Suffolk Coast and Heaths AONB.


 Careful routeing and site selection to avoid key sensitive land uses such as development land, urban land and residential land.


 Micro-routeing of the onshore cable route as close to field boundaries as possible, so as not to create ‘orphan’ fields.


 Careful routeing to minimise length of cabling within floodplains.  Careful routeing to avoid large areas of woodland.


2,400 mm2 123 16


4 Source: ABB “http://www05.abb.com/global/scot/scot221.nsf/veritydisplay/fb4d15b402dc68c7c12577210040f853/$file/p


ow0038%20r6%20lr.pdf 5 Source: ABB ” http://www05.abb.com/global/scot/scot221.nsf/veritydisplay/fb4d15b402dc68c7c12577210040f853/$file/po w0038%20r6%20lr.pdf


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 5 Description of the Development Page 69


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