HIGH-FREQUENCY COMPONENTS IN THE NEUTRAL AND PROTECTIVE EARTH CURRENTS DUE TO ELECTRONIC EQUIPMENT

This paper addresses the issue of neutral and protectiveearth currents in the frequency range 2 through 150 kHz. Both theoretical analysis and measurements will be presented. It is concluded that a large part of the highfrequency distortion in the phase currents closes via the neutral wire and impacts the terminal voltage for equipment in the other phases. The introduction of HF-harmonics is even more detrimental to the intention with three-phase systems to minimize the currents outside the phase conductors.

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