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Measuring peak power for rating plate

M. Joshi
I would like to measure the peak power drawn by various pieces of equipment individually so that the figure can be shown on each equipment's rating plate.


I'm considering using the peak demand function on a MID power meter but, using 0.5s/0.2s CTs instead for better accuracy.  Is this approach acceptable?
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    As MIke says, we need to know what "peak power" we are talking about (or more importantly, which "peak power" the OP requires):
    • peak rms power (rms current multiplied by rms voltage - or VA)

    • peak rms real power (rms current multiplied by rms voltage, taking into account power factor)

    • peak average power (true average power over a given time)

    • peak power, as in the maximum peak wattage the power wave reaches as the power varies over tim



    Usually for appliances, the appliance will be set up for the maximum load conditions it would normally expect (e.g. washing machine will be on tumble + heating on hot wash) and the rms power or average power is measured - with the supply voltage being either the nominal voltage (if only one voltage is stated on the plate), or the worst-case voltage in a range if a range is quoted.


    Some product standards require a maximum rms load current rather than a power to be stated on the rating plate, though. In this case, for example, an SMPSU quoted 80-230 V nominal would have the rms input current measured with a supply voltage of 80 V as this would be higher than the current at 230 V.

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  • 0
    As MIke says, we need to know what "peak power" we are talking about (or more importantly, which "peak power" the OP requires):
    • peak rms power (rms current multiplied by rms voltage - or VA)

    • peak rms real power (rms current multiplied by rms voltage, taking into account power factor)

    • peak average power (true average power over a given time)

    • peak power, as in the maximum peak wattage the power wave reaches as the power varies over tim



    Usually for appliances, the appliance will be set up for the maximum load conditions it would normally expect (e.g. washing machine will be on tumble + heating on hot wash) and the rms power or average power is measured - with the supply voltage being either the nominal voltage (if only one voltage is stated on the plate), or the worst-case voltage in a range if a range is quoted.


    Some product standards require a maximum rms load current rather than a power to be stated on the rating plate, though. In this case, for example, an SMPSU quoted 80-230 V nominal would have the rms input current measured with a supply voltage of 80 V as this would be higher than the current at 230 V.

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