Oil-immersed three-phase transformer capable of retarding flame in time

The invention relates to the technical field of three-phase transformers, in particular to a timely flame-retardant oil-immersed three-phase transformer which comprises a three-phase transformer body, a heat dissipation channel is formed in the side wall of the three-phase transformer body, a strip-shaped groove is formed in the center of the lower end of the three-phase transformer body, and a heat dissipation plate is slidably mounted in the heat dissipation channel. A heat dissipation groove is formed in the side wall of the heat dissipation plate, a center groove is formed in the heat dissipation plate and communicates with the heat dissipation groove, a clamping groove is formed in the inner wall of the center groove, a first inner groove is formed in the side wall of the heat dissipation plate in a penetrating mode, a circular groove is formed in the lower end of the heat dissipation plate and communicates with the first inner groove, and a dovetail block is slidably installed in the dovetail groove. An