IMPROVEMENT OF ROMANIAN NETWORK'S LIGHTNING PERFORMANCE THROUGH A BETTER KNOWLEDGE OF LIGHTNING ACTIVITY

摘要

The paper presents some of the results issued from the statistical analysis of the events recorded by the Romanian Lightning Detection and Location System (RLDLS) during three years of activity (2003 to 2005). General features of the lightning activity over the Romanian territory were obtained using GIS software, namely the regional distributions of the keraunic level and the flash density. The overall distributions for some of the lightning currents parameters such as polarity, multiplicity, peak current, derivative, charge and energy were established. The assessment of lightning exposure for transmission lines was realized by detecting lightning events inside the zones of exposure associated to the overhead line path. A zone of exposure (or buffer) is a surface whose shape is dictated by the specific geometry of the installation under study; hereby, for an overhead line the buffer is a band. Several criteria to establish appropriate dimensions for the buffer were tried, in order to compensate the inherent uncertainty associated to the impact location. The results of the basic and advanced statistical analyze of the collected lightning data are presented and compared to the overall distributions. We conclude with some general observations on the use of lightning data by power utilities.