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Author Topic: Slowing or reversing a KWH meter.  (Read 15906 times)

Offline MarkE

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Re: Slowing or reversing a KWH meter.
« Reply #15 on: April 15, 2015, 12:53:07 PM »
Only the red lines are getting hot. The meter's principle is very easy, for example you use 100W, that's 0,45A, the meter's registering 220V at 0,45A, simple for now. The device works in this way: the meter's registering 2.5A(Example) at 220V, that means 550W. And if you have a load of 550W(Heater, Computer, etc) the power measured by your meter would be 0W
A wire around the meter reduces the meter current to zero.  The transformer has unwanted consequences.  If you were to break the connection between the primary and secondary the transformer obviously bucks and the top of the secondary feeding the house is at neutral potential.  You get nothing.

If you restore the connections as in your sketch, then the secondary is shorted.  The primary impedance appears very low and huge currents run through the meter and the primary.  Essentially the primary resistance in series with only its leakage inductance appears across the meter output to neutral.  Huge currents flow and the premise still gets almost nothing.