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Maximum demand ammeters

Kelly Marie Angel

I've seen a few fotos recently on  vintage mains plugs  and other curiositys  page on Facebook of the inside of various 11/0,4 kv  substations  they all seem to have ammeters to measure the current on each phase these are max demand meters how do they reset the maximum value indicator? Also do they have a way to record  these values? The meters I've seen all look old  as the hills so not sure what recording technology  was around years ago. I know  these days a lot if these subs have a radio link  at least here in SSE land

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    Which is why they intend to switch it all off, and replace it with a much more complicated VOIP system, which won't work if there's a power cut.

    Many will expect to will fall back to a mobile phone, whose base stations are not backed up in the way a traditional exchange is/was, so if that power cut is wide-area you may find that all non private comms and internet is lost after an hour or two. For a power cut that is occasional, maybe that is OK, depends rather where you live and your state of health.

    Ever thought of taking the exam for amateur radio? It is surprising how far a rig running off a car battery can get out.

    Mike.

    G7VZY

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  • 0

     

    Which is why they intend to switch it all off, and replace it with a much more complicated VOIP system, which won't work if there's a power cut.

    Many will expect to will fall back to a mobile phone, whose base stations are not backed up in the way a traditional exchange is/was, so if that power cut is wide-area you may find that all non private comms and internet is lost after an hour or two. For a power cut that is occasional, maybe that is OK, depends rather where you live and your state of health.

    Ever thought of taking the exam for amateur radio? It is surprising how far a rig running off a car battery can get out.

    Mike.

    G7VZY

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