To determine the exciting characteristics of different types of grain-oriented silicon steel applied to UHV transformer

two types of grain-oriented silicon steel samples-ordinary high magnetic induction and laser scored magnetic domain refinement-were employed to conduct comparison tests of four basic magnetic properties: the iron-loss per unit weight

the magnetization characteristic curve

the excitation power curve and the magnetostrictive rate

and no-load loss and no-load current of single-phase dual-column yoke-type UHV transformer iron core with two types of silicon steel were calculated. Moreover

the no-load loss machine

no-load current

exciting characteristic

and no-load noise characteristics of 1 000 k V UHV transformer manufactured by two types of silicon steel were studied and analyzed. The results show that the iron-loss per unit weight and no-load loss of The UHV transformer machine manufacured by domestic 0.27 mm laser-scored magnetic domain refinement grain-oriented silicon steel is lower and no-load additional loss coefficient is close

compared with those of the imported steel with the same thickness of the high magnetic induction grain-oriented silicon. The magnetizing current and magnetostrictive of two types of silicon steel does not have peer relations with the no-load magnetizing current and no-load noise of the UHV transformer machine.