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Schneider Electric Egypt×
Vigirex devices carry out rms measurements on the zero-sequence currents. This is to:
a- accurately measure the harmonic currents and avoid nuisance tripping due to non dangerous currents with high crest factors .
b- correctly calibrate the energies of the fault currents because, for both fire hazards and the protection of property, it is the energy of the fault current that must be taken into account.