User talk:Marshelec

Welcome to Wikimedia Commons, Marshelec!

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-- 20:21, 19 September 2011 (UTC)

File:New Zealand HVDC link schematic.svg

Black rectangles almost certainly caused by Inkscape "flowtext" nonsense; see Commons:SVG Check... AnonMoos (talk) 06:37, 26 May 2012 (UTC)

Thanks, as a new user of Inkscape I was unaware of this, but will try to get it sorted. I saved the file as .png and this worked OK, although I think the image is a bit fuzzy.. Cheers, Marshelec (talk) 06:44, 26 May 2012 (UTC)

Image HVDC Submarine Cable Cross Section

HVDC Cable

Hello Marshelec,

• Do you know the diameter of this special cable?

If you know it exactly, an inserted scale with comparable length would be useful, placed inside the image.
• Jaybear • ...disc. • 14:10, 2 November 2012 (UTC)

Your request at Graphic Lab/Illustration workshop

Hi, please close sections at Graphic Lab/Illustration workshop (commons) with {{section resolved|1=~~~~}} if your request is finished to trigger automatic archiving. --Mrmw (talk) 06:43, 23 April 2020 (UTC)

File:Landis+Gyr E450 G3 1-Phase Smart Electricity Meter.jpg

File:Landis+Gyr E450 G3 1-Phase Smart Electricity Meter.jpg has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry. If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue. Please see Commons:But it's my own work! for a guide on how to address these issues. Please remember to respond to and – if appropriate – contradict the arguments supporting deletion. Arguments which focus on the nominator will not affect the result of the nomination. Thank you!

Wdwd (talk) 09:28, 12 September 2023 (UTC)

A question on an image you submitted

The HVDC inter-island thyristor stacks, if servicing is required, is one layer of the stack replaced or the entire unit? Either way imbues me with dread...Wzrd1 (talk) 03:19, 9 April 2024 (UTC)

@Wzrd1 Servicing can range from simple to complex. For the ABB thyristor valves shown in c:File:Pole_2_Thyristor_Valve.jpg the valves consist of multiple modules in each layer in the stack, and each module contains multiple thyristors. The thyristors look broadly similar to this one (from a different manufacturer): c:File:Thyristor Westcode N3476TC420.jpg. They are assembled with others in a module, stacked in series and pressed together with water-cooled heatsinks to ensure good conduction of the high current and safe dissipation of losses. The individual thyristors are highly reliable and failures are rare. However, it is possible to replace a complete module, using a spare, and it is also possible to partially dis-assemble a module to replace a failed thyristor. The main item of routine maintenance for the valve is the cooling water systems. The valve is cooled using de-ionised and de-oxygenated water pumped to each layer of the stack. The water treatment systems contain consumable materials that require regular maintenance to ensure the water purity is retained. Historically, some maintenance inspection, monitoring and replacement has been required on metal components in the valve cooling system within the stacks, because they can be prone to erosion caused by the voltage stress along the cooling system path. The valve stacks are accessed during shutdowns using a dedicated power-operated elevating work platform. However, you do need a good head for heights. Marshelec (talk) 03:42, 9 April 2024 (UTC)