In order to make up for the lack of saturated excitation characteristics research with simulation calcula-tion and transformer machine test on the UHV transformer

the basic magnetic test of imported and domestic highmagnetic oriented silicon steel sheet standard samples were carried out. And transformer core models were builtwith the same structure

equivalent magnetic flux density as UHV transformer. Based on the models

the saturatedexcitation characteristic detection system of transformer was established. The basic magnetic characteristics of thestandard samples and the over-excitation characteristics of the transformer model were studied and analyzed. The re-sults show that

under over-excitation conditions

the relationship between the excitation characteristics of thetransformer model and the base magnetic characteristics of the standard samples is not fully consistent with the cal-culation formula

distortion of no-load current is serious and the proportion of the higher harmonics increase

thebasic magnetic characteristics of the standard samples of imported and domestic high magnetic oriented siliconsteel sheets are basically the same and the saturated excitation characteristics of the corresponding transformer coremodel are different.