Indoor dry type three-phase combined current transformer

The utility model relates to a low-voltage measuring device of an electrical power system, in particular to an indoor dry type three-phase combined current transformer, comprising a secondary winding, a primary winding and a secondary wiring cover. A primary terminal row and a secondary terminal row form an external connecting portion, and a transformer is provided with the secondary terminal row that is corresponding to the terminal row of an electric energy meter and can be used for directly connecting the electric energy meter. The primary terminal row is composed of a primary incoming line row that is arranged at the upper part of the transformer and a primary lead out line that is arranged at the lower part of the transformer, and sealing insulating bushes are covered at the outer sides of the primary incoming line row and the lead out line row. The primary winding are wound on the secondary winding that is arranged at the inner part of the transformer, and the primary winding is respectively connected with the primary incoming line row and the lead out line row. The lead out line end of the secondary winding is provided with a secondary wiring cover, and the pouring body of the transformer is poured by nominal transformation ratio. The indoor dry type three-phase combined current transformer has the advantages of compact structure, convenient wiring, convenient, safe and reliable operability, accurate measure and theft-proof electricity.