engleski

Lightning overvoltage protection of combined overhead line and underground cable distribution network

This paper presents the analysis of lightning overvoltages in a mixed overhead line and underground cable distribution network supplying an industrial consumer. Different overvoltage protection scenarios were discussed, including the installation of surge arresters at both cable ends. Lightning overvoltages in 35 kV distribution network were calculated by using EMTP-ATP software. Open end of a cable was considered in simulations as the most unfavourable switching configuration. Lightning parameters derived from LINET lightning location system observations around 35 kV overhead line were analysed and compared to the ones used in literature and standards. Lightning flash multiplicity was taken into account in order to determine the probability distribution of lightning current amplitude of the first and subsequent cloud-to-ground strokes. The energy absorbed by surge arresters was determined and an optimal overvoltage protection of the underground cable was proposed.

Lightning overvoltages ; overhead line ; cable ; distribution network ; overvoltage protection ; lightning location system

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