Large current three-position double-fracture disconnecting switch

Abstract

The invention discloses a large current three-position double-fracture disconnecting switch. The large current three-position double-fracture disconnecting switch comprises moving cutters, a ground row, fixed contacts and moving cutter supports, wherein moving contact ends are arranged at the two ends of each moving cutter, each moving cutter comprises two contact pieces, and inner sides of the moving contact ends of the every two contact pieces are respectively provided with a contact face. The outer sides of the moving contact ends of the every two contact pieces are respectively provided with a magnetic locking plate, the moving contact ends and the magnetic locking plates of the every two contact pieces are connected through a bolt, and a belleville spring is arranged on the outer side of each magnetic locking plate. An arc-shaped pulling plate which is taken as a middle transmission component is eliminated, assembling difficulty is reduced, stress-bearing in contact is more even, and meanwhile current-carrying performance of the moving cutters are improved.

Description

technical field [0001] The invention relates to an isolating switch, in particular to a large current three-position double-break isolating switch. Background technique [0002] Isolating switch is the most widely used electrical appliance in high-voltage switchgear. Its working principle and structure are relatively simple. The impact is relatively large. [0003] Such as figure 1 As shown, the isolating switch in the prior art is a three-station single-break structure, and its operation process is: [0004] When the movable knife rotates to the position of the copper bar in the arc extinguishing chamber, it is in the closed state; when the movable knife rotates to the supporting position of the movable knife, it is in the open state; when the movable knife rotates to the contact position, it is in the grounded state. [0005] There are at least the following disadvantages in the above-mentioned prior art: [0006] Such as figure 1 As shown, the shaft and the moving kn...

AI Technical Summary

Problems solved by technology

[0006] like figure 1 As shown, the shaft and the moving knife are connected by an arc-shaped drawing plate, which not only makes the structure of the isolating switch more complicated, but also increases the manufacturing cost; figure 2 As shown, the contact between the movable knife and the contact is a point contact, which reduces the current carrying capacity; if there is no corresponding fastening between the movable knife, after repeated operations, it may cause the loosening of the movable knife and affect the breaking performance of the isolating switch.

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