Metal oxide arrester

Abstract

The invention discloses a metal oxide arrester. The metal oxide arrester comprises a hollow insulating cylinder, an upper metal sealing plate, a lower metal sealing plate, a conducting post and a cluster parachute, wherein the upper metal sealing plate is arranged on the upper end of the hollow insulating cylinder, the lower metal sealing plate is arranged on the lower end of the hollow insulating cylinder, the conducting post is axially arranged in the hollow insulating cylinder, the cluster parachute covers the outer surface of the hollow insulating cylinder, a gap radially exists between the hollow insulating cylinder and the conducting post, the upper end of the conducting post makes contact with the upper metal sealing plate, the lower end of the conducting post makes contact with the lower metal sealing plate, and the conducting post is formed in a way that zinc oxide resistance discs and metal conductors are alternately overlapped. The invention provides the metal oxide arrester with high heat dissipation performance, and the problem of easiness in thermal breakdown and thermal explosion of a metal oxide arrester with an existing structure is solved.

Description

technical field [0001] The invention relates to a metal oxide lightning arrester, which belongs to the technical field of electric equipment. Background technique [0002] Surge arresters are protective devices used to protect the insulation performance of electrical equipment in power systems from lightning overvoltage damage, or to avoid internal overvoltage damage caused by equipment operation. It is an important protection link related to the safe and stable operation of power systems. With the increase of the voltage level, the system overvoltage problem becomes increasingly prominent, and it is particularly important to improve the operation performance of the arrester. [0003] The structure of the metal oxide arrester in the prior art is that a plurality of non-linear resistance sheets mainly composed of zinc oxide are stacked together in an insulating container provided with upper and lower electrodes. It has a very high resistance when the voltage is normal, so it...

AI Technical Summary

Problems solved by technology

However, in addition to the long-term power frequency voltage, the metal oxide arrester with this structure also intermittently withstands transient overvoltages such as power frequency overvoltage, lightning overvoltage, and operating overvoltage, which can easily lead to an increase in the temperature of the internal zinc oxide resistor. High, and the heat cannot be effectively dissipated, when the temperature exceeds a certain limit value for a long time, it will cause thermal damage (thermal collapse) of the arrester

In addition, in the thunderstorm season, when the arrester is struck by lightning, a large lightning shock current flows through the resistor sheet, causing it to absorb a large amount of impact energy. Because the energy cannot be effectively transmitted and released quickly, the gas pressure and temperature inside the arrester increase sharply. , often lead to explosion accidents, seriously affecting the safe and stable operation of the power system

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