The core lamination of dry-type transformer is composed of electrical magnetic steel strip stacked or wound. The core structural parts are mainly composed of clamp, foot pad, supporting plate, tension belt, pulling screw and pressure nail. The structural parts ensure that the lamination is fully clamped to form a complete and firm core structure. There are insulating parts between the laminated sheet and the clamping piece, the foot pad, the supporting plate, the tension belt and the pulling plate. The core lamination of dry-type transformer leads out the grounding lead, which is connected to the clamp or is reliably grounded to the outside through the mailbox. The core of dry-type transformer is not allowed to have multi-point grounding. The lower clamp of large-scale transformer core is located by the locating nail of the mailbox, and the positioning part on the upper part of the core is positioned with the mailbox. In order to reduce the no-load loss and no-load current of all transformers, the core of dry-type transformer is made of Cold-rolled electrical magnetic steel strip with high magnetic conductivity grain orientation, and a series of measures are also taken in the structure. The core is bound by inclined seam without hole to adapt to the directionality of cold-rolled oriented magnetic steel sheet and the core structure with symmetrical magnetic circuit. In addition, there are new double frame and multi frame structure, such as single-phase double frame and three-phase four frame structure.
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