Indoor bus-type current transformer

An indoor bus-type current transformer comprises a transformer body and an insulating shell. The transformer body comprises isomerism through hole inserts, the insulating shell comprises a shell body and a mounting flange, secondary wiring screws, a grounding screw and four mounting holes are arranged on the mounting flange, a protecting cover and a sealing hole screw are arranged outside the secondary wiring screws, a bus inner hole is arranged at the axis of the shell body, three uniformly-distributed and equidistant umbrella skirts are symmetrically arranged on two end faces of the shell body, a spring voltage-equalizing device is mounted on the central inner wall of the bus inner hole, the isomerism through hole inserts are arranged on the mounting holes and symmetrically protrude out of the mounting flange, and a boss is arranged on the shell body. The indoor bus-type current transformer has the advantages that creepage distance of the end portion of the shell body is effectively increased, and pollution