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3.9 Self-supervision
4 Measurement functions
Technical description
118
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VM265.EN011
4.
Measurement functions
All the direct measurements are based on fundamental
frequency values. (The exceptions are frequency and
instantaneous current for arc protection.) The figure shows a
current waveform and the corresponding fundamental
frequency component, second harmonic and rms value in a
special case, when the current deviates significantly from a
pure sine wave.
Figure 4-1 Example of various current values of a transformer inrush
current.
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