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This paper gives the performance of lightning overvoltage due real lightning discharges that have occurred in distribution power lines equipped with covered conductors. Evaluation and simulations are based on real lightning data collected from the Finnish Meteorological Institute (FMI) from 1998 to 2008. The presented feeder is an overhead distribution line with a covered conductor subjected to indirect...
This paper presents the evaluation and simulation of real lightning discharges that have occurred in medium voltage overhead lines equipped with covered conductors (CC). Lightning stroke current selections are based on real lightning data collected from the Finnish Meteorological Institute (FMI) from 1998 to 2008. The presented feeder is an overhead distribution line with a covered conductor subjected...
This paper studies the performance of an MV underground cable due to a nearby lightning discharge. The simulation is made with Finite Element Method (FEM). The effects of lightning stroke location, resistivity of the soil and underground cable configurations are considered. The results of the numerical computation show how electric field intensity and potential distribution vary with the factors mentioned...
Lightning overvoltages are responsible for the majority of faults and outages that occur in Medium Voltage (MV) distribution networks. The overhead lines can be protected from the above phenomena with adequate installation of surge arresters and shield wires. Insulation enhancement can also play a significant role in minimizing outage rates of the lines, though it will not be so effective. However,...
Lightning strokes represent a considerable cause of short interruptions in overhead line medium voltage networks. The overvoltages caused by lightning can not be avoided but their influence can be limited by appropriate overvoltage protection. This paper presents the results of theoretical studies about the number of short interruptions caused by lightning in various environmental circumstances. The...
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