Aiming at shortcomings of traditional transformers

such as being easily saturated

small dynamic measurement range and narrow measuring band

a novel combined electronic transformer is proposed. The insulating structure of inverted SF

6

transformer is adopted

the Rogowski coil and cylindrical coaxial capacitor are used as the sensors and the improved digital integral method is adopted in the integral link

which effectively improve the reliability and accuracy of the proposed transformer. The simulative and test results show that the proposed transformer has high accuracy and meets the requirements of 0.2S and 0.2 accuracy level

and compared with the single-function transformers

it only needs one insulation body to achieve simultaneous measurement of volta

ge and current

so it has the advantages of small size and low cost.