Answer Posted / r.k.shah

Meter Constant for an Energy meter is the amount of KWH
used in its low voltage circuit for each revolution of the
induction disc. Here the explanations are given for a
typical industrial 3-Ph Energy Meter which is fed by a
suitable CT & PT.

To calculate the MC: If it is given that No. of Revolutions
per KWh then, MC is inverse of this no. For example, Let's
say for a certain Energy meter, No. of Rev./KWH is given as
4000, then MC = 1/4000.

If the No. of Rev. per KWH is given as a very small No.
like 0.06 or 0.16 etc. then it refers to KWH value in
primary circuit. That is, 1 KWH value passes in HV circuit
for given amount of Rev. To calculate MC in such cases,
invert such No. & then devide by CT & PT ratio.

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