Lightning arrester

Abstract

The invention relates to the field of a power system, and discloses a lightning arrester. The lightning arrester comprises an arc extinguishing segment and a resistance segment, wherein the arc extinguishing segment and the resistance segment are coaxially and vertically arranged, an upper end of the arc extinguishing segment is connected with a lower end of the resistance segment, an upper end of the resistance segment is connected with external ground, the arc extinguishing segment comprises an epoxy core rod and a spiral umbrella disc, the spiral umbrella disc is spirally wound around an outer side of the epoxy core rod, a plurality of arc extinguishing units are arranged at an outer edge of the spiral umbrella disc at intervals, the resistance segment comprises a cylindrical resistance body and a plurality of annular umbrella discs, the annular umbrella discs are sleeved at an outer side of the resistance body at intervals. By the lightning arrester, a lightning current is effectively released during lightning of a power transmission line, the current amplitude of a power frequency follow current after action of a lightning wave also can be limited, a circuit is prevented from being stricken, the power frequency follow current also can be effectively cut off even the resistance segment is damaged or failure, and the normal and stable running of the power transmission line is ensured.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a lightning arrester. Background technique [0002] The phenomenon of lightning strikes widely exists in the power system. The tripping and blackout accidents of transmission lines caused by lightning strikes bring huge economic losses to the power system and also threaten the safe and stable operation of the power grid. The installation of line arresters is currently the main lightning protection method for transmission lines measure. [0003] In the existing metal oxide lightning arrester, when the resistor sheet is damaged, the resistance value of the resistor sheet will decrease, so that the arrester cannot cut off the power-frequency freewheeling current after the lightning wave acts, thereby making the arrester invalid. Although the existing multiple short-gap arresters can cut off large freewheeling currents, single multiple short-gap arresters are prone to high-amp...

AI Technical Summary

Problems solved by technology

[0005] Existing metal oxide arresters are prone to problems such as resistance drop and arrester failure due to the aging and damage of resistors, while single multiple short-gap arresters are prone to high-amplitude power-frequency freewheeling after the action of lightning waves, which is harmful to the power grid. It produces a large impact, so it must be used in conjunction with the automatic reclosing system, which reduces the insulation level of the line to a certain extent

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