10 An introduction to the analysis of short-circuit earth return current, rise of earth potential and electrical interference
10.1 Background
We outlined in Chapter 1, one area where short-circuit current calculations are made to calculate rise of earth potential at substations and at overhead transmission line towers. During an unbalanced single-phase to earth or two-phase to earth short-circuit fault, either the total earth fault current or a proportion of it will flow through the general mass of the earth and return to the source. The earth current will return to the neutral point(s) of the supply transformers or sources supplying the fault current through a substation earth electrode system that has a finite impedance. The product of the ...
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