3. Isolated variations
3.1 Determining the upstream impedance value
In the following example, taken from a real case, we will evaluate the influence of each network element in the calculation of voltage surge amplitude.
We consider a load supplied at low voltage (LV) by 180 m of LV cable, downstream of a 400 kVA MV/LV transformer, itself supplied by an MV line coming from the medium-voltage (MV) busbar of a source substation.
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Isolated variations
Generators of repetitive or random fluctuations
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