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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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    Very old ones used a glass tube, curved so that ball bearings inside were stuck in positions connected to a “strong” movement. The balls left in the tube showed how far it had rotated. Clever idea, but now lost in the mists of time.

    506bbd708d26813eca7b49ebdee92acc-original-max-demand-indicator.jpg
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  • 0

    Very old ones used a glass tube, curved so that ball bearings inside were stuck in positions connected to a “strong” movement. The balls left in the tube showed how far it had rotated. Clever idea, but now lost in the mists of time.

    506bbd708d26813eca7b49ebdee92acc-original-max-demand-indicator.jpg
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