High voltage falling compound fuser

Abstract

The high-voltage drop type composite fuse disclosed by the invention is a protection device for electrical equipment, suitable for short-circuit and overload protection of power transmission lines and electrical equipment with an AC frequency of 50 Hz and a rated voltage of 60 kV or below. The high-voltage drop-out composite fuse includes a wire and a melt. The melt is connected in series on the wire, and a current-limiting fuse is connected in series on the wire. One end of the melt is connected to the current-limiting fuse. Connect one end of the wire connected in series with the fuse part of the present invention to the power supply, and connect the other end to the electrical equipment. The invention can limit the amplitude and steepness of the fault current, reduce the burning degree of equipment, avoid the tripping of power lines, form an obvious isolation gap, and facilitate the maintenance of equipment.

Description

technical field [0001] The invention belongs to a protection device for electrical equipment, in particular to a high-voltage drop-out composite fuse, which is suitable for short-circuit and overload protection of power transmission lines and electrical equipment with AC 50HZ and rated voltage of 60kV or below. Background technique [0002] There are currently two types of AC high-voltage fuse protection devices. One is to connect a current-limiting fuse for protection. This current-limiting fuse is composed of a ceramic tube and a fuse, such as XRNT1-12, XRNT1-40.5, XRNT1-7.2 and other models fuses. The defect of this fuse is that the fuse is installed inside the ceramic tube, even if the fuse is blown, no obvious isolation gap visible to the naked eye can be formed, which brings inconvenience to the maintenance equipment. But the most prominent advantage is that when the fault current flows, the time to cut off the fault current is short, which is much shorter than that o...

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of this kind of AC high-voltage drop-type melt is that it does not have the characteristics of limiting the fault current, and the burning time is relatively long, so it cannot limit the amplitude and steepness of the fault current.

Although it can be dropped to form an obvious isolation gap that can be seen by the naked eye, the falling time is longer, resulting in a greater degree of equipment burnout, and sometimes causing power line tripping, which brings losses to production and increases production costs.

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