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High Pressure Discharge Lamp - A Non-Liniar Circuit Element? Harmonics Level. Network Electricity Losses Determined by Distorting Conditions
Mihaela GUSA, Camelia BURLACU, Mircea COSTEA
Studies, Research and Engineering Group ( GSCI ) Power Studies Center (CS)
1, Lacul Tei Blvd., 72301 Bucharest, Romania
Abstract
Although electricity consumption for public lighting has a small weight compared to the industry one, all the developed countries keep an eye on public lighting systems which use top quality equipment. Using high pressure discharge lamps with high efficiency can lead to important energy savings. However, this kind of lamp is a non - linear circuit element with low power factor. More than that, the adherent electromagnetic ballasts worsen the circuit power factor. High harmonics can be injected into network.
This means that both power supply and consumer are affected, leading to energy savings diminution. Even it is perfectly known that self ballasted high pressure mercury lamps ( which will be called ?blended lamps? in this paper ) do not have high efficacy, so that, they are quite very rarely used in public lighting, we shall include them in our study, on the one hand, because they belong to the high pressure discharge lamps category, and, on the other hand, because they could be used for open spaces lighting, where the color rendering index must be improved.
The paper presents a harmonic levels studies for lamps produced by five manufacturers (1 - Romanian and 4 - other than Romanian) and used for public lighting.
The study is based on high precision laboratory measurements made by this paper authors. For a concrete case, a comparative assessment of network electricity losses, caused by induced distorting conditions, is also presented.
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