DANSK DSF/IEC TR 61000-4-40 ED1 PDF

This technical report deals with the assessment of electrical power quantities (RMS voltage, RMS current and active power). It explains and compares two digital algorithms suitable for power quantity measurements in fluctuating or non-periodic loads. The examples are from 50 Hz or 60 Hz power systems. This report does not attempt to cover all possible digital implementations of algorithms used for power quantity assessment in fluctuating loads, for example in the context of EMC assessment described in several IEC standards. Rather, it compares averaging with one of the filtering algorithms. This report aims to highlight some examples of applications that illustrate how the presented algorithms work. Further, guidance is given for quantifying the accuracy of each approach.