This paper presents a study to investigate the electrical disturbances in LV networks due to energization of MV networks. Domestic clients have reported electrical equipment failures on energizing MV networks. Data about the networks where the clients were affected was collected. A statistical analysis was conducted, for each case, to find the cumulative distribution probability of the overvoltage amplitude, for different switching conditions. Field measurements on a MV network that supply several distribution transformers were made to record switching transients and verify the models developed in a digital transients software. The experimental results verify the digital models and they represent the behavior of the MV network under electrical disturbance conditions.
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