Open-close type residual current transformer

The utility model relates to the technical field of transformers, in particular to an open-close type residual current transformer. The utility model discloses an open-close type residual current transformer. The transformer comprises a semi-annular upper shell, a semi-annular lower shell, a semi-annular upper magnetic core and a semi-annular lower magnetic core, the two ends of the upper shell and the two ends of the lower shell are in butt joint to form an annular shell. The first ends of the upper shell and the lower shell are pivoted with each other; the second end of the upper shell and the second end of the lower shell are detachably connected through screws. Wherein the upper magnetic core and the lower magnetic core are respectively arranged in the upper shell and the lower shell,two ends of the upper magnetic core and two ends of the lower magnetic core are in butt joint to form an annular magnetic core, the upper magnetic core and the lower magnetic core are respectively provided with a winding coil