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If a harmonic current I n of order n, with the samefrequency as the parallel resonance frequencyf ar , is injected by the disturbing equipment, thecorresponding harmonic voltage can beestimated as V n = R I n withn=n ar =f ar /f 1 .Estimation of n arThe order n ar of parallel resonance is the ratio ofthe resonance frequency f ar to the fundamentalfrequency f 1 (power frequency).Consider the most elementary industrial network,shown in the equivalent diagram in figure 16 ,including a capacitor bank C supplied by atransformer with a short-circuit inductance L T ,where Lsc represents the short-circuitinductance of the distribution network seen fromthe upstream terminals of the transformer,far=1.2 π (Lsc + L ) CTAs Lsc