Transformer

The utility model relates to the technical field of transformers, in particular to an internal lead of a transformer. The transformer comprises a box body, fluid media are filled in the box body, three-phase iron cores are arranged in the box body, a winding is wound outside each three-phase iron core, an internal lead connected with the winding of the corresponding phase is further arranged in the box body, the internal lead is a pipe body, and the wire outlet section of the winding of the corresponding phase is fixedly connected to the corresponding end of the pipe body. The two ends of the pipe body are open so that fluid media can flow through the pipe body. The internal lead adopts a tube body structure, and the fluid medium can flow through an internal channel of the internal lead, so that the fluid medium can be in contact with the inner wall and the outer wall of the internal lead, the contact area of the fluid medium and the internal lead is increased, and the heat dissipation efficiency is better. I