How to calculate the Meter constant for the given Meter (by
using any formula)
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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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I have a current transformer with 1 main reading meter with transformer outside the building and a control panel having 5 CT reading meters with black round coils inside the building. I want to know, A) when current pass through the Transformers, will the current be reduced or be the same and after that B) when current pass through the CT meters with black round coils, will the current be reduced or be the same. C) in the above process will the reading of the main meter be same or different, from the total reading of all the 5 CT meters.
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