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Since switching to three phase my consumption has rocketed to 25,000KWH per annum, despite no significant additional load.

adam spearing

We moved to three phase 3.5 years ago an anticipation of electric cars (which we don't have). 

Since then We have been consuming around 25,000KWH pa according to the meter. 

I've had a second meter fitted and it's validated these numbers. 

When I switch all the RCDs off it stops, so clearly it's my side of the RCDs. 

The house is around 10 years old with gas heating and gas cooking. We have low energy light bulbs. 

The overnight consumption seems to show we're using 4+KWH per hour when we're asleep. 

Load balancing was mentioned and I vaguely remember it from my degree but I don't believe that's it. 

Large donation to charity if you can help me work this one out

thanks in advance 

Adam

  • 0

    Mechanical meter

    circuitglobe.com/three-phase-energy-meter.html

  • 0

     

    commercial and industrial three phase metering is different to domestic, when I worked at a saw mill we had to be careful about how and when we started the big saw, because there was a maximum demand trip on the meter and a penalty was applied if we tripped it.

  • 0 in reply to Sparkingchip

    Blondels' Theorem & the two wattmeter method do only work with a BALANCED three phase load, that is true. BUT a tariff electricity meter doesn't rely on that method (hence why all three phases & the neutral pass through it).

  • 0 in reply to Sparkingchip

    Yes, some commercial supplies did/do include a maximum demand element which would trigger a price increase if that demand was exceeded, but I'm sure this was based on kVA and not just current alone - hence if is combined kVA across all the phases. A

  • 0 in reply to mapj1
    mapj1 said:
    Now it may not be the best use of the capabilities of a 3 phase supply to not load one at all

    I don't quite see the difference between using two phases at a 3-phase service head on the one hand, and bringing in two single-phase supplies from the street. It might even be cheaper.

    (My late mother had a 3-phase supply, but with only one connected. I assume that it was because she lived in the last house in the street and it had been easiest to bring in the end of the street main.)

  • 0

    The last post was by @Chris Pearson five hours ago, goodness only knows where it is, as it has been added onto a post from a few days ago.

  • 0 in reply to Sparkingchip

    There's an easy solution - it just needs everyone to ignore the 'Reply to...' buttons and uses the big 'Reply' button at the top instead (like wot I just didn't).

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