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, 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 connected with one ends of the two arc-shaped sections respectively, and the other end of the lower U-shaped section is connected with the other end of the arc-shaped section. 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 sampling probe are completely embedded with the bottom conductive block after installation and are tightly embedded with each other, so that the voltage value is stable, and the problem of poo