Grid type fuse wire sheet with inverse-time characteristic curve

Abstract

The invention discloses a grid type fuse wire sheet with an inverse-time characteristic curve, and belongs to the field of an emergency protection apparatus. The grid type fuse wire sheet comprises even number of fuse links, wherein first and second connecting sheets are correspondingly arranged at the two ends of the fuse links; the connection parts between the fuse links and the first and second connecting sheets are subjected to a silver soldering way for fixedly connecting the two ends of the fuse links and the first and second connecting sheets into a whole body; then the integrated grid type fuse wire sheet is subjected to annealing treatment wholly; by adoption of the manufacturing process and the welding method, the current impact resistance of the grid type fuse wire sheet is greatly improved; the grid type fuse wire sheet has the inverse-time protection characteristic; it is ensured that the grid type fuse wire sheet is not fused within 1h when 1.3 times of rated load current passes through the fuse wire sheet; and it is ensured that the grid type fuse wire sheet needs to be fused for sure within 1h when 2 times of rated load current passes through the fuse wire sheet. The grid type fuse wire sheet can be widely applied to the manufacturing field of the grid type fuse wires of an outdoor low-voltage distribution transformation fuse wire box.

Description

technical field [0001] The invention belongs to the field of emergency protection devices, in particular to an overcurrent protection device used in a low-voltage power distribution system. Background technique [0002] The date of the authorized announcement is October 24, 2012, and the Chinese utility model patent with the authorized announcement number CN 202502968 U discloses a grid-type fuse for outdoor low-voltage distribution transformer fuse boxes, including fuses, and the fuses are at least One piece; the first and second connecting pieces are respectively arranged at both ends of the fuse body; the first and second connecting pieces are respectively provided with U-shaped opening fixing grooves; the connection between the fuse body and the first and second connecting pieces At the position, a sloped transition section is provided; the first and second connecting pieces are in the same plane; the fuse and the first and second connecting pieces are in two parallel pl...

AI Technical Summary

Problems solved by technology

[0003] However, in this technical solution, the connection between the fuse body and the first and second connecting pieces is crimped and fixed as a whole. The fuse can only meet the conventional line overload protection function, and does not have time-delay protection. It has an inverse time limit for some requirements. characteristic line protection requirements cannot be met