Calculation of lightning-induced voltages on complex low-voltage distribution networks

This paper presents an investigation of lightning overvoltages on low-voltage (LV) networks installed in urban areas. The combined effect of lightning-induced voltages and transferred lightning surges through distribution transformers is taken into account. It is shown that an accurate estimate of lightning-induced voltages on LV lines require the consideration of the medium voltage line and of its electrical connections with the LV line via the distribution transformer. It is also shown that if the stroke location is relatively close to the evaluated LV line it is possible to neglect the influence of other LV lines in the estimation of peak overvoltages on the connected loads.

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