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Changing Settling Time of RMS Values

Question asked by tonile on Nov 30, 2015
Latest reply on Dec 7, 2015 by hmani

We want to use the ADE7878 for measuring half-wave RMS Values of Voltage, Current and for Phase Voltage Sag Detection. It should be used to detect a Voltage Sag when a LVRT (Low Voltage Ride Through) occurs on a Phase. The detection of a LVRT (voltage dips to under 0,9 * Uc) should be less than 20 ms. After the detection we need a half-wave RMS Value of the voltage for control strategy.

My Question is: how long does it take to get a new RMS value, when the voltage dips on a phase?

Example: The Voltage dips to 0V. Does a new RMS Value need the specified 440 ms to settle or less? Is it possible to calculate the half-wave RMS values of voltage and current?

Best Regards,