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SINGLE PHASE LOAD SHEDDING

John Peckham

I design LV electrical installations including large current hungry domestic installs. I am frequently having single phase supplies upgraded to 3 phase for these houses due to mutiple ovens in kitchens, ASHP, AC units, EV charging etc loads. If I cannot get an upgraded 3 phase supply I want to use load shedding so that the single phase supply capacity is not exceeded. I am looking for a simple 3 phases device with current coils on the supply that will disconect chosen loads. I do not want any fancy electronics or PLCs etc. Can anyone recommend any product on the UK market that will do this.


Thanks

JP

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    Hello John,

    As others have pointed out, and as I'm sure you're aware, whatever solution you come up with will have to feature a degree of hysteresis to avoid instability, so I'm struggling to see how you can avoid some electronics. Have you looked at the Shelly devices? I've used one of these https://shellystore.co.uk/product/shelly-pro-3em/ for current monitoring with a view to implementing load shedding if that turned out to be necessary, which it didn't. The device can be interfaced with an external contactor and there appears to be reasonable user community support in terms of pre-written scripts, though I'd be surprised if you didn't have to do some customisation to suit your particular application.

    Geoff

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  • 0

    Hello John,

    As others have pointed out, and as I'm sure you're aware, whatever solution you come up with will have to feature a degree of hysteresis to avoid instability, so I'm struggling to see how you can avoid some electronics. Have you looked at the Shelly devices? I've used one of these https://shellystore.co.uk/product/shelly-pro-3em/ for current monitoring with a view to implementing load shedding if that turned out to be necessary, which it didn't. The device can be interfaced with an external contactor and there appears to be reasonable user community support in terms of pre-written scripts, though I'd be surprised if you didn't have to do some customisation to suit your particular application.

    Geoff

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