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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

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  • 0

    Two Wattmeter Method of Power Measurement - Blondel’s Theorem

    https://www.electricaldeck.com/2021/05/two-wattmeter-method-of-power-measurement.html

    A bit of light reading, actually trying to picture this in my mind is challenging, as there’s current flowing in and out on the phases also possibly out on the neutral, but the neutral could be balanced out.

    So the yellow phase appears unmetered however current returns through the red and blue measurement coils, but presumably current could flow in on the yellow then split to return through the red and blue phases as well as the neutral if it is unbalanced, so may bypass the measurement coils by exiting the installation through the neutral?

    In that arrangement if only the yellow was in use would the meter record anything?

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  • 0

    Two Wattmeter Method of Power Measurement - Blondel’s Theorem

    https://www.electricaldeck.com/2021/05/two-wattmeter-method-of-power-measurement.html

    A bit of light reading, actually trying to picture this in my mind is challenging, as there’s current flowing in and out on the phases also possibly out on the neutral, but the neutral could be balanced out.

    So the yellow phase appears unmetered however current returns through the red and blue measurement coils, but presumably current could flow in on the yellow then split to return through the red and blue phases as well as the neutral if it is unbalanced, so may bypass the measurement coils by exiting the installation through the neutral?

    In that arrangement if only the yellow was in use would the meter record anything?

Children
  • 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).

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