Comparative study of electromagnetic and electronic ballasts - an assessment on harmonic emission

In this paper, several high power lighting networks based on high pressures sodium (HPS) lamps with rated lamp powers of 70, 150 and 250 W have been set up. Those lamps have been studied with both electromagnetic and dimmable electronic ballasts, which can dim the lamp output smoothly and uniformly. Lamps connected to electronic equipment have been tested with different levels of power using dimming for a 220 V power supply. HPS lamps have been chosen because they are used in public lighting. This paper focuses on the harmonic characterization of modern HPS lamps connected to both types of devices. Harmonics under full and reduced power for several HPS lamps have been measured. It presents an investigation on the attenuation effect and a proposal of an index called the equivalent lamp index to characterize this effect on HPS lamps. Also it is concluded that using a combination of HPS lamps can result in a reduction of the current distortion.

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Analizowano system oświetleniowy wykorzystujący lampy sodowe. Badano lampy obciążone układami elektronicznymi i elektromagnetycznymi do sterowania jasnością. Zmierzono zawartość harmonicznych przy pełnej i ograniczonej mocy. Zaproponowano metody redukcji zniekształcenia prądu.