The invention relates to an electronic current transformer, comprising an electronic current transformer body, an image detection apparatus and a DSP (digital signal processor) chip by company TI. The image detection apparatus is used for analyzing frame defects of a housing of the electronic current transformer body, the DSP chip by company TI receives frame analysis results and transmits them to a display apparatus for displaying. Through the invention, it is possible to automatically analyze the type of frame defects of the electronic current transformer while optimizing the structure of the electronic current transformer.