SU1396171A1 - Fusible cutout - Google Patents

Abstract

The invention relates to electrical engineering, to low-voltage apparatus. The aim of the invention is to improve the protective characteristics of the fuse. In a fuse (PP), there is at least one ribbon fusible element 4 with fusible necks 6 of the same shape and size, made with perforation, and in at least one pair of adjacent fusible necks 6 the distance between them is 0.1 -0.4 distance between the other neighboring necks. 6. The fusible element 4 is located in the granular arc-filler 3, which fills the housing Sh1. In the emergency mode of the PP, all the fusible pegs of the lattice 6 are simultaneously melted and electric arcs form in their place. The arcs at the site of the paired isthmuses 6 are merged into one arc, and thus the number of arcs is reduced. The distance between the rest of the fusible necks 6. ensures that the arcs formed in their place are carried until the end of the arc period. 2 Il. with (L

Description

I The invention relates to electrical engineering, to a low-voltage apparatus, to: low temperature, namely to fuses.

The aim of the invention is to improve the protective characteristics of the fuse.

FIG. 1 shows a fuse, cut; in fig. 2 - fusible element.

The fuse comprises a housing 1 made, for example, of an electrically insulating material, with

ten

the number of consecutive arcs per voltage rise rate in each individual arc is large, and when the current decreases by 2-4 times, the arcs of the paired fusible necks 6 merge, thus reducing the number of arcs, and the voltage on the fusible element contributing to current limiting, without reaching its maximum value is limited and does not exceed

given value. This is ensured in each case by selecting the required number of paired

flanges 2 of electrically conductive ma- ss of fusible necks 6, depending on the material. Housing 1 is full of grains of permissible overvoltages for that

or another circuit sought by the fuse. In this case, the arc voltage. Sheni has a rectangular shape. 20 The fuse compared with the prototype allows simultaneous increase in speed

in case of current limitation, limit the value of the overvoltage to the specified magnitude of the overvoltage (test 3, in which there is at least one ribbon fusible element 4, attached: flared to the flanges 2 by means of short; pin terminals 5. Perforations are made in the fuse element 4, consecutively parallel; MI series along its length, fits fusible in the same shape and size, and 25 meters, while in prototype 6 (perforated areas), speed performance during current limitation inevitably causes an increase in overvoltage Thus, in the emergency mode, the guard has improved protective guards up to the extinction of these arc characteristics as compared to the prototype. In the fusible element 4 there is a type, for example, due to - at least one pair of fuses protected by such a fuse of the first-electron 6, which are spaced from each other, semiconductor can be used

: a friend at a distanceJ equal to 0.1-0.4 35 of a lower class (which is su-;

This is a weakened section. The distances between adjacent isthmuses 6. Short-circuit conditions were selected.

The distance between the remaining neighboring isthmuses 6. The number of such pairs of fusible necks 6 is limited by the conditions of cooling of the fusible element 4 in normal operation, the allowable density of passage of current through it, dimensions, etc. The fusible element has various versions according to the number of paired fusible necks 6 (Figs. 1 and 2).

The fuse works in the same way.

In the normal operation mode of the fused circuit, the fusible element 4 conducts the rated current. In emergency mode, in places of all fusible necks of the 6th worm, it is weakened, with the aim of enhancing the protective characteristics, at least in the tape perforated fusible element

The cross section at the same time melts the fusible element 4 and the “D perforated area located in their place are electrically relative to each other at different arcs. In the first period of the arc, the steepness of the voltage front at the fusible element 4, determined by

standing, equal to 0.1-0.4 distances between the remaining perforated portions.

the number of consecutive arcs per voltage rise rate in each individual arc is large, and when the current decreases by 2-4 times, the arcs of the paired fusible necks 6 merge, thus reducing the number of arcs, and the voltage on the fusible element contributing to current limiting, without reaching its maximum value is limited and does not exceed

Claims (1)

at current limitation, limit the amount of overvoltage to a given value, while in the prototype, increasing the speed at current limitation inevitably leads to an increase in overvoltage to the maximum value. Thus, the proposed technology will simplify their manufacture, or reduce by 30-40 % integral of the transmitted current over time-burning and increase the current load on the semiconductor device by 10-20%. Formula of gain A fuse, comprising a housing, filled with an arc-filled filler, at least: one perforated tape-like fusible element connected to contact outlets, with the perforated sections of the tape fusible element arranged in parallel rows along its length not. different topics that, in order to enhance the protective characteristics, in a tape perforated fusible element at least The perforated areas are located relative to each other in the The perforated areas are located relative to each other in the standing, equal to 0.1-0.4 distances between the remaining perforated portions. q3az.2