ASSESSMENT OF HIGH-FREQUENCY CONDUCTED DISTURBANCES PRODUCED BY MODERN LAMPS

Due to their operating principle, practically all nonlinear receivers inject in the network both low and high-frequency disturbances. The high-frequency (HF) conducted disturbances are measured, according to the relevant EMC standards, in the range of 9 kHz up to 30 MHz, using dedicated circuits which extract these frequencies from the supplying voltage of the appliance. The paper is centred on the parameters influencing the level and spectrum of the disturbances injected in the aforementioned frequency range by modern lamps and the cumulative effect of several consumers of this type injecting disturbances simultaneously in the same low voltage network. A new weighting quantity is proposed to evaluate the HF spectrum of a given consumer, namely the integral of the noise's peak level vs. frequency.