What is the difference between the watt hour meter and Var
hour meter in terms of internal connection and work theory .
ie "When the meter records watt-hour an when the meter
records var hours ??"
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Answer Posted / k.prakashchandra
I came across a site with all details in Google ,but can not
retrace it now.However ,I am furnishing the following from
the other sites.1.The KVARH meter has a displacement angle
(-90')for current coil lagging the voltage in voltage coil
where KWH meter has zero degree displacement angle.2. The EM
meter (for 3 phase power)feeds power of each line(phase)
through it and disc spins for either WH or VAH .The only
difference for VARH meter is that there is an equipment for
displacement of voltage by 90'.This can be an auto
transformer or RC circuit.From my first reply, you can see
that the line voltage YB is at 90' to R
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