How to calculate the slowness and fastness of energy meter if we have different kw load for example (0.746 kw and meter rev constant 400 and we calculate the 2 rev in 30 sec) and explain the formula ?



How to calculate the slowness and fastness of energy meter if we have different kw load for example (0.746 kw and meter rev constant 400 and we calculate the 2 rev in 30 sec) and explain the formula ?

    Meter rev constant means rev/ kwh.

    Then one rotation = 60x60/400 or 9kws.

    2 rotations = 18kws.

    Time taken is 30s.

    Then the av load is 18/ 30 or 0.6 kw.

    To calculate whether this Energy Meter is slow or fast using this formula.

    Slowness/Fastness=Tc−To/To X 100

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