Fully-insulated enclosed fuse

Abstract

The invention relates to a fully-insulated enclosed fuse comprising a rubber pedestal. An upper static contact is arranged at the upper part inside an outer insulating porcelain insulator; and an upper auxiliary spring is arranged inside the upper static contact. An arc extinguishing tube is arranged at the lower part of the upper static contact; and an arc extinguishing rod is arranged in the arcextinguishing tube. An upper moving contact is arranged at the lower end of the arc extinguishing rod and is connected with a fusion tube by a fusion tube connecting element. An arc shrinkage bar isarranged at the upper part inside the fusion tube and is connected with a fuse wire. A buffer cover is arranged at the upper part outside the fusion tube; a lower static contact is arranged at the inner side of the buffer cover; and a lower moving contact is arranged outside the fusion tube. The lower inner pipe of the fusion tube has a segmented stepped structure with the larger bottom and the smaller top. Besides, a fuse wire connection boss is arranged at one side with the central line corresponding to the straight line of the outer wall of the lower moving contact. The fully-insulated enclosed fuse has advantages of stable operation, high usage safety and reliability, powerful product carrier and breaking capabilities, and long service life.

Description

technical field [0001] The invention relates to a power equipment device, in particular to an insulating fuse. Background technique [0002] The conductors of the upper and lower dynamic and static contacts of traditional drop-out fuses are exposed, and foreign objects are easy to be caught. Trees cause phase-to-phase or grounding short circuits of the fuse, which is one of the key fault sources of overhead lines. In addition, the exposed conductors are prone to rust, resulting in overheating caused by poor contact, spring annealing, and overheating of the contacts will lead to a vicious cycle of increased resistance, causing the fusion tube to fall and cause a power failure, or the contacts are burnt and melted into one body. The fusion tube cannot fall off and loses its function. In addition, ordinary insulated fuses, due to the poor coordination between the arc suppression tube and the arc suppression rod during operation, the arc energy generated when the short circuit ...

AI Technical Summary

Problems solved by technology

[0002] The conductors of the upper and lower dynamic and static contacts of the traditional drop-out fuse are exposed, and it is easy to hang foreign objects and trees to cause the phase-to-phase or grounding short circuit of the fuse, which is one of the key fault sources of overhead lines

In addition, the exposed conductors are prone to rust, resulting in overheating caused by poor contact, spring annealing, and overheating of the contacts will lead to a vicious cycle of increased resistance, causing the fusion tube to fall and cause a power failure, or the contacts are burnt and melted into one body. The fusion tube cannot fall off and loses its function

In addition, ordinary insulated fuses, due to the poor coordination between the arc suppression tube and the arc suppression rod during operation, the arc energy generated when the short circuit is disconnected is relatively large, which is likely to cause damage to the fuse and affect the service life of the fuse. And the fuse will generate temperature when it is working, which will cause the temperature of the fuse itself to rise and reduce the service life of the fuse, and the fuse tube is one of the important parts of the short-circuit disconnection of the fuse. If the quality of the fuse tube is poor, it is easy to cause the fuse Unable to work, reduced safety performance

Images