Bushing for mining explosion-proof dry-type transformer and production method for bushing

Abstract

The invention belongs to the field of accessories of transformers, and particularly relates to a low-contact resistance bushing for a mining explosion-proof dry-type transformer and a production method for the bushing. The bushing for the mining explosion-proof dry-type transformer comprises a cylindrical conducting rod. The diameter of the middle part of the conducting rod is smaller than the diameters of the two ends of the conducting rod. Transitional conical surfaces are arranged between the middle part and the two ends of the conducting rod. A circular flange is sleeved on the conducting rod, and is positioned in the middle part of the conducting rod. The central axis of the flange and the axis of the conducting rod are coaxial. An insulated fixing block is injection-molded between the conducting rod and the circular flange. The novel bushing for the mining explosion-proof dry-type transformer is simple in structure and convenient to produce; and by the bushing for the transformer, the contact area of a connecting part is enlarged, and a wiring terminal of an outgoing cable directly contacts with the conducting rod, so that the contact resistance of the connecting part is lowered, and the heating of a contact part can be effectively controlled.

Description

technical field [0001] The invention belongs to the field of accessories of transformers, and in particular relates to a bushing of a flameproof dry-type transformer used in mines with small contact resistance and a production method thereof. Background technique [0002] At present, the conductive rod of the bushing used in the known explosion-proof dry-type transformer for mining uses a round copper rod, and the round copper rod has threads at the wiring part. Two copper washers clamp the connecting terminal of the outgoing cable and put it on the conductive rod. Finally, another copper nut is screwed on the conductive rod to press the cable terminal on the conductive rod to form an electrical connection. When this structure is used in practice, the casing will burst due to heat generated at the connecting part, which is extremely dangerous for long-term use. The contact area of ​​this structure is small, the multiple contacts lead to large contact resistance, and the con...

AI Technical Summary

Problems solved by technology

When this structure is actually used, the heat at the connection part will cause the casing to burst, which is extremely dangerous for long-term use

The contact area of ​​this structure is small, multiple contacts lead to large contact resistance, and the concentration of contact parts leads to concentrated heat generation

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