Talk:Isle of Man to England Interconnector

Untitled

404 for the http://www.metoc.co.uk/RenewableEnergy/CaseStudy2.html

~leo — Preceding unsigned comment added by 61.17.22.252 (talk) 04:20, 27 June 2006 (UTC)

"longest in the world"

Article will need a small rewrite when the 580km NorNed cable is in operation, expected to be in early 2008. -- MiG 14:13, 31 October 2006 (UTC)

Actually the articles says "the longest AC submarine power cable in the world". As NordNed is DC cable, there is no need to change this sentence. In absolute terms the Isle of Man to England Interconnector is not the longest submarine cable anyway.Beagel (talk) 14:41, 16 February 2008 (UTC)

exact location of the substation in Douglas

Which are the exact coordinates of the substation in Douglas, where the cable ends? — Preceding unsigned comment added by 217.228.16.108 (talk) 01:20, 5 November 2016 (UTC)

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Capacity of the Interconnector

Some of the statements concerning capacity and connection voltage and the references need correction. I am not an expert editor so I will leave it to others.

The following document as a pdf file can be found by google search "Manx Marine Environmental Assessment – 2nd Ed. October 2018. Manx Marine Environmental Assessment, Infrastructure, Cables & Pipelines, MMEA Chapter 6.1". It clearly states that the cable is 90kV and 60MW.

By contrast, the Manx Utilities website here: https://www.manxutilities.im/about-us/our-assets/electricity/subsea-cable/ states that the capacity is 65MW, but does not state the cable's operating voltage. However it also says that it is connected to the 132kV network in Northwest England (that is a standard voltage on GB mainland). I think that is the source of the confusion about the cable's operating voltage. Of course there will need to be a transformer at the GB end to convert 90kV to 132kV.

I suggest the text be edited to say that it is operated at 90kV, has a capacity of up to 65MW, and is connected to the 132kV network at the GB mainland end. DMWard (talk) 11:54, 16 February 2022 (UTC)

The link connects onto the UK-mainland National Grid network at Bispham Substation, which is a 132kV substation. National Grid ESO confirms this along with the power level of 74MW. I'd class that as a verifiable reliable source. What the actual cable voltage is may be different because as you say there will be a transformer to step up to 132kV. I'll see what else I can dig out. --10mmsocket (talk) 18:19, 16 February 2022 (UTC)

I agree that National Grid ESO's interconnector register shows its capacity as 74MW, but it does not say where it is connected.

I did a search with Google streetview, and found the sign indicating that the Manx cable is connected at Bispham. Bispham is a 132kV substation belonging to Electricity North-West and not National Grid. DMWard (talk) 22:48, 30 July 2022 (UTC)

Ofgem list it as 90kV 67MW. Isle of Man Government (page 8) list it as 90kV 60MW. I think it's safe to assume the voltage is 90kV and maybe say the power is quoted as between 60 and 67MW (giving all sources). 10mmsocket (talk) 18:33, 16 February 2022 (UTC)

That Isle of Man Government reference is the same one I referenced which is dated 2018. The Ofgem document you refer to is not dated, but if you read it, it seems to have been written by the Isle of Man government in or before 2014. I am guessing that the agreed rating may have been increased over time with experience and commercial pressure.The figure of 74MW in the NGESO spreadsheet is the TEC (transmission entry/exit capacity). TEC has probably been set slightly above the actual maximum useable capacity, because it is against the rules to exceed TEC. It may also include an allowance for losses on the Electricity NorthWest system. DMWard (talk) 23:01, 30 July 2022 (UTC)

It's an AC submarine cable, and therefore will suffer large capacitative losses. I do wonder if the 67MW/60MW discrepancy is due to this? 67MW power in, 7MW lost, and only 60MW out? An AC overhead line will lose perhaps 6% over 1000km. So a loss of 10% over 100km underwater doesn't seem unfeasible. Hallucegenia (talk) 12:25, 31 July 2022 (UTC)