The paper deals with the harmonic emission limits provided by International Electrotechnical Commission (IEC) Std. 61000-3-2 for appliances with current absorption less than or equal to 16 Amps. To this aim attention is focussed on personal computers (PC) as a sample of the wide non-linear appliance class D as regulated by the Standard. Results of some laboratory tests on a PC supplied from the low voltage (LV) grid show that: 1) IEC limits expressed in mA/W are exceeded by actual PCs operating in practical systems; 2) the LEG limits are stated for nominal load even though lower loading conditions produce higher specific (mA/W) harmonic contents. The problems are assessed by means of a testing activity performed in laboratory. To this aim, an experimental layout providing harmonic monitoring of a PC supplied from a system with variable impedance has been implemented in laboratory.
IEC Std. 61000-3-2 harmonic current emission limits in practical systems: need of considering loading level and attenuation effects / Grasselli, Umberto; Lamedica, Regina; Prudenzi, A.. - STAMPA. - 1:(2001), pp. 277-282. (Intervento presentato al convegno 2001 IEEE Power Engineering Society Summer Meeting tenutosi a Vancouver, BC nel 15 July 2001through19 July 2001).
IEC Std. 61000-3-2 harmonic current emission limits in practical systems: need of considering loading level and attenuation effects
GRASSELLI, Umberto;LAMEDICA, Regina;
2001
Abstract
The paper deals with the harmonic emission limits provided by International Electrotechnical Commission (IEC) Std. 61000-3-2 for appliances with current absorption less than or equal to 16 Amps. To this aim attention is focussed on personal computers (PC) as a sample of the wide non-linear appliance class D as regulated by the Standard. Results of some laboratory tests on a PC supplied from the low voltage (LV) grid show that: 1) IEC limits expressed in mA/W are exceeded by actual PCs operating in practical systems; 2) the LEG limits are stated for nominal load even though lower loading conditions produce higher specific (mA/W) harmonic contents. The problems are assessed by means of a testing activity performed in laboratory. To this aim, an experimental layout providing harmonic monitoring of a PC supplied from a system with variable impedance has been implemented in laboratory.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
