High-protection ammeter current transformer

The invention relates to a high-protection ammeter current transformer, which comprises a shell, a U-shaped mutual inductance frame and a voltage sampling needle, and is characterized in that the cross section of the shell is a closed body formed by two U-shaped sections and two arc-shaped sections, one U-shaped section forms the bottom of the shell and is marked as a lower U-shaped section, the two ends of the lower U-shaped section are respectively connected with one ends of the two arc-shaped sections, and the other end of the lower U-shaped section is connected with the other end of the two arc-shaped sections. One U shape is marked as an upper U shape, two ends of the other U shape are respectively connected with the other ends of the two arc-shaped bodies, a cylindrical convex column is arranged in the shell, the cylindrical convex column and the shell are integrated, and a rectangular hole is formed in the cylindrical convex column. According to the invention, the two probe holes of the voltage samplin