Method for allowing low-voltage lightning protector to acquire fault indicating function

Abstract

The invention discloses a method for allowing a low-voltage lightning protector to acquire a fault indicating function, and belongs to the field of lightning protectors. A guiding tube and / or an outerreleasing sleeve tube is arranged in the outer circumference of an embedded hot melting releasing assembly at the lower end of a low-voltage lightning protector body, a fluorescent color belt layer is arranged on the outer surface of the guiding tube and / or the outer releasing sleeve tube, when internal faults of the low-voltage lightning protector take place, the embedded hot melting releasing assembly and the outer releasing sleeve tube drop from the low-voltage lightning protector, a faulted low-voltage lightning protector is not operated, the fluorescent color belt layer is exposed, the fluorescent color belt layer forms an obvious fluorescent color belt mark, a long-distance fault indicating function of the faulted low-voltage lightning protector is achieved to help maintenance workers to rapidly find out a faulted point in the long distance, and the replacement of the faulted low-voltage lightning protector is rapidly conducted. The method can be widely used in the field of thedesigning, manufacturing, operation maintaining and the like of the low-voltage lighting protector with the working voltage from 1 kV to below 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 1kV and 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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