Modeling the warm-up phase of a high-pressure-lamps lighting network

This work presents a study of the dynamic regime of a lamp-network interact ion corresponding to the warm-up phase of a high-pressure mercury discharge lamp, The lamp's behavior is described by a variable pressure model using the local thermodynamic equilibrium (LTE) concept. Indeed, this model cover s the most interesting phase of the network dynamic regime, where discharge lamps appreciably impose their nonlinearity, We first analyze the electric al behavior of the discharge lamp in a single phase circuit, taking into ac count the ballast saturation. Then a micronetwork is studied and we show th e influence of the discharge's evolution on currents in phases and neutral conductors. Finally, from the results of the physical model, we set up a si mple parametric modeling which reproduces the electrical behavior of the la mp during its warm-up phase. Such an approach can be useful fdr electrical engineers working on the discharge supply circuits at industrial frequency (50-60 Hz).