Method to ensure the qualification rate of low-voltage surge arrester with built-in hot-melt detachment components

Abstract

The invention provides a method of guaranteeing the product percent of pass of a low voltage surge arrester with a built-in hot melting isolating assembly and belongs to the field of arresters. By adopting a threaded connection structure, the built-in hot melting isolating assembly and a ground lead are fixed to the lower end surface of a lower pole plate, so that a reliable mechanical fastening effect and a circuit connection function between a metal core wire and a metal sleeve base of the ground lead with the built-in hot melting isolating assembly are achieved, and an automatic hot meltingdisconnection function and a quick fall-off function of the ground lead are achieved when the low voltage surge arrester fails inside, so that the arrester can quit operation automatically. The assembling quality is stable, so that the production efficiency of the low voltage surge arrester with the built-in hot melting isolating assembly is improved, and the product percent of pass of the low voltage surge arrester with the built-in hot melting isolating assembly is ensured. The method can be widely applied to the fields of design, manufacture or operation and maintenance of low voltage surge arresters, the working voltages of which are below 1 to 0.5 kV.

Description

technical field [0001] The invention belongs to the field of lightning arresters, in particular to a lightning arrester used for overvoltage protection of a low-voltage power system. Background technique [0002] Surge arrester is an electrical device used to protect electrical equipment from transient overvoltage (lightning strike, operation, steep wave) and quickly cut off power frequency continuous current. It is usually connected in parallel with the protected line or equipment. [0003] Its internal main components are non-linear resistors (such as zinc oxide resistors), which are in a high-resistance state under normal power frequency voltage due to their good non-linearity, and the arrester will not operate. When the overvoltage occurs, the action resistance sheet of the arrester is turned on, and the overvoltage shock current absorbs part of the energy through the resistance sheet and then leaks into the ground, thereby reducing the amplitude of the overvoltage, redu...

AI Technical Summary

Problems solved by technology

[0014] Existing external hot-melt disconnectors or thermal-explosive disconnectors are only suitable for high and medium voltage systems, and cannot be applied to low-voltage systems below 0.5kV

The reason is that the rated voltage / operating voltage of the arrester in the low-voltage system is low, the air gap between the two electrodes cannot be broken down, and the arc cannot be generated in the thermal explosion disconnector, resulting in the thermal explosion disconnector being unable to pass through the detonation heat. Explosive components to achieve the purpose of "disconnecting" the ground lead

However, because the heat-melt disconnector is used externally, the heat generated by the fault current cannot be transmitted to the disconnector, so the disconnector cannot operate

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