5.2 Setting on the Measurement Setting Screen (MEASUREMENT)
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What is the Reactive-power-meter method?
• The reactive-power-meter method is used to measure reactive
power directly from the voltage and current, like a reactive power
meter installed for large power consumers.
• With some voltage and current waveforms, reactive power,
apparent power, and power factor measurements may vary
depending on the reactive-power-meter setting.
• <Influence on the Power Factor>
When the reactive-power-meter method is OFF (not to be used),
the power factor is obtained as a ratio of the active power to
apparent power. Because calculation includes the harmonic
component, the power factor will decrease as the harmonic cur-
rent increases.
When the reactive-power-meter method is ON (to be used), the
power factor is obtained as a cosine of the phase difference
between the fundamental voltage and fundamental current. Cal-
culation is performed using the fundamental component only,
and does not include the harmonic component.
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