Accuracy and sensitivity of FRA hav

Accuracy and sensitivity of FRA have been discussed in a number of literature [19]-[21]. In this study, a 400MVA step up failed transformer has been taken as a case in order to clarify the capability of FRA and SCI methods. Main technical specification of the transformer is given in Table I.
Short circuit impedance of windings was measured with all LV windings short circuited and measurement is performed at HV side. Results are presented in Table II.